YOKOGAWA DL 1540, DL 1520, DL 1540L, DL 1520L User Manual

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Page 1

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Digital Oscilloscope

Yokogawa Electric Corporation

IM 701510-01E

7th Edition

Page 2

Introduction

Notes

Thank you for purchasing the YOKOGAWA DL1520/DL1520L/DL1540/DL1540L Digital Oscilloscope. This User’s Manual contains useful information about the functions and operating procedures of the instrument, mainly DL1540. It also contains precautions that should be observed during use. Main differences in the specifications between DL1540 and DL1520/ DL1520L/DL1540L are that DL1520 has two input channels, DL1520L has two input channels and allows record length of up to 1M words, and DL1540L allows record length of up to 2M words. Due to these differences, functions and operations differ slightly among these models. For a detailed description, refer to the relevant sections of this manual. To ensure correct use of the instrument, please read this manual thoroughly before operating it. Keep the manual in a safe place for quick reference whenever a question arises. Two manuals are provided with the instrument in addition to this manual.

Manual Name Manual No. Description

DL 1540/1540L/1520/1520L IM701510-02E Describes basic operations only. Operation Guide

DL 1540/1540L/1520/1520L IM701510-11E Describes the communications functions Communication Interface for the GP-IB/RS-232-C interface.

User’s Manual

• The contents of this manual are subject to change without prior notice as a result of improvements in the instrument’s performance and functions. Display contents illustrated in this manual may differ slightly from what actually appears on your screen.

• Every effort has been made in the preparation of this manual to ensure the accuracy of its contents. However, should you have any questions or find any errors, please contact your nearest YOKOGAWA representative as listed on the back cover of this manual.

• Copying or reproduction of all or any part of the contents of this manual without YOKOGAWA’s permission is strictly prohibited.

Trademarks

Revisions

MS-DOS is a registered trademark of Microsoft Corporation. HP-GL is a registered trademark of Hewlett-Packard Company. PostScript is a registered trademark of Adobe Systems Incorporated.

1st Edition : June 1995 2ndEdition : October 1995 3rd Edition: February 1996 4th Edition : May 1996 5th Edition : September 1996 6th Edition : March 1997 7th Edition : May 1997

Disk No. DL16

7th Edition: May 1997 (YG)

IM 701510-01E

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Checking the Contents of the Package

Unpack the box and check the contents before operating the instrument. If the wrong instrument or accessories have been delivered, if some accessories are missing or if they appear abnormal, contact the dealer from which you purchased them.

Main Body

Check that the model name and suffix code given on the name plate of the rear panel match those on your order.

MODEL

SUFFIX

NO.

MODEL (Type Name)

701505 : DL1520, 701515 : DL1520L, 701510 : DL1540, 701520 : DL1540L

Made in Japan

SUFFIX (Suffix Code)

Suffix Code Specifications

Power voltage (For DL1540, DL1540L)

(For DL1520, DL1520L)

Power cord -D UL/CSA Standards Power Cord (Part No.: A1006WD)

Interface (On DL1520, select from C1, C2 and C3. On DL1520L, select from C1, C2, C3 and C4.)

Options /B5 Built-in printer (real-time printing function)

Example: DL1540, UL/CSA standard power cord and full options → 701510-1-D/B5/E1/F1 *GP-IB interface comes standard with DL1540/DL1540L.

-1 100-120 VAC/200-240 VAC

-5 100-120 VAC/200-240 VAC

-1 100-120 V AC

-5 200-240 V AC

[Maximum Rated Voltage: 125 V, Maximum Rated Current: 7 A]

-F VDE Standard Power Cord (Part No.: A1009WD) [Maximum Rated Voltage: 250 V, Maximum Rated Current: 10 A]

-Q BS Standard Power Cord (Part No.: A1054WD) [Maximum Rated Voltage: 250 V, Maximum Rated Current: 10 A]

-R SAA Standard Power Cord (Part No.: A1024WD) [Maximum Rated Voltage: 240 V, Maximum Rated Current: 10 A]

-C1 GP-IB Interface

-C2 RS-232-C Interface

-C3 GP-IB & Centronics Interface

-C4 GP-IB & SCSI Interface

/E1 With two additional 150 MHz probes

(Available on DL1540/DL1540L)

/F1 Additional trigger (OR, Pattern, Width)

(Available on DL1540/DL1540L)

NO. (Instrument No.)

When contacting the dealer from which you purchased your instrument, please quote the instrument No.

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Standard Accessories

User's manual (this manual) Communication interface manual Operation guide

Printer roll chart

∗



B9850NX

Printer connecting cable

∗

 (centronics connector to  D-sub socket) B9916TB

Power supply fuse (in fuse holder) For DL1540/DL1540L, for suffix code -1 & -5: A1351EF For DL1520/DL1520L, for suffix code -1: A1436EF for suffix code -5: A1349EF

150MHz probe (10:1, 1:1 selectable)(x2)

∗

2

700998

UL/CSA standard A1006WD

VDE standard A1009WD 

BS standard A1054WD

SAA standard A1024WD

(x1) (x1) (x1)

Rubber feet(x4) A9088ZMx2

Soft case B9918EZ

Front cover B9920BT

Power cord (one of the following power cords

is supplied according to the instrument's suffix codes)

SCSI adapter

∗

 B9916TD 

Checking the Contents of the Package

The following standard accessories are supplied with the instrument. Make sure that all items are present and undamaged.

*1 Supplied with DL1520/DL1520L and suffix code -C3 only. *2 For DL1540/DL1540L, a total of four passive probes are supplied (if the two optional probes

are included). *3 A roll chart will be supplied only when the instrument is equipped with a built-in printer. *4 Supplied only with DL1520L with suffix code -C4.

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

Checking the Contents of the Package

Optional Accessories

The following optional accessories are available. On receiving these optional accessories, make sure that all the items that you ordered have been supplied and that they are undamaged. If you have any questions regarding optional accessories, or if you wish to place an order, contact the dealer from whom you purchased the instrument.

Mini-clip convertor B9852CR

Optional Spare Parts

The following optional spare parts are available. On receiving these optional spare parts, make sure that all the items that you ordered have been supplied and that they are undamaged. If you have any questions regarding optional spare parts, or if you wish to place an order, contact the dealer from whom you purchased the instrument.

BNC adapter B9852CS

Ground lead B9852CT

50 Ω Through terminator 700976

Carrying case 700915

Part Name Part No. Minimum Q’ty Remarks

150 MHz passive probe 700998 1 Input impedance: 10 MΩ, Length: 1.5 m Roll chart B9850NX 5 Thermo-sensible paper, Total length: 30 m Power supply fuse A1351EF 2 Time lag, 3.15 A, 250 V (for DL1540, DL1540L) (for suffix code -1 and -5) Power supply fuse A1436EF 5 Time lag, 3 A, 250 V (for suffix code -1) (for DL1520, DL1520L) A1349EF 2 Time lag, 2 A, 250 V (for suffix code -5)

Note

It is recommended that the packing box be kept in a safe place. The box can be used when you need to transport the instrument somewhere.

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Safety Precautions

This instrument is an IEC safety class I instrument (provided with terminal for protective grounding). The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. If this instrument is used in a manner not specified in this manual, the protection provided by this instrument may be impaired. Also YOKOGAWA Electric Corporation assumes no liability for the customer’s failure to comply with these requirements.

The following symbols are used on this instrument.

To avoid injury, death of personnel or damage to the instrument, the operator must refer to an explanation in the User’s Manual or Service manual.

Function Grounding Terminal (This terminals shold not be used as a “Protective grounding terminal”.)

Alternating current

ON(power)

OFF(power)

In-position of a bistable push control

Out-position of a bistable push control

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Safety Precaustions

WARNING

Power Supply

Ensure the source voltage matches the voltage of the power supply before turning on the power.

Power Cord and Plug

To prevent an electric shock or fire, be sure to use the power supply cord supplied by YOKOGAWA. The main power plug must be plugged in an outlet with protective grounding terminal. Do not invalidate protection by using an extension cord without protective grounding.

Protective Grounding

Make sure to connect the protective grounding to prevent an electric shock before turning on the power.

Necessity of Protective Grounding

Never cut off the internal or external protective grounding wire or disconnect the wiring of protective grounding terminal. Doing so poses a potential shock hazard.

Defect of Protective Grounding and Fuse

Do not operate the instrument when protective grounding or fuse might be defective.

Fuse

To prevent a fire, make sure to use fuses with specified standard (current, voltage, type). Before replacing the fuses, turn off the power and disconnect the power source. Do not use a different fuse or short-circuit the fuse holder.

Do not Operate in an Explosive Atmosphere

Do not operate the instrument in the presence of flammable liquids or vapors. Operation of any electrical instrument in such an environment constitutes a safety hazard.

Do not Remove any Covers

There are some areas with high voltage. Do not remove any cover if the power supply is connected. The cover should be removed by qualified personnel only.

External Connection

To ground securely, connect the protective grounding before connecting to measurement or control unit.

Handling the CRT

This CRT is in conformity with the requirements specified in CSA and VDE standards. However please avoid rough handling or jarring of the instrument to prevent possible CRT implosion. Breakage of the CRT may cause a high velocity scattering of glass fragments.

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How to Use this Manual

Structure of the Manual

This User’s Manual consists of 16 chapters, an Appendix and an Index as described below.

Chapter Title Description 1 Functions Describes measurement principles and functions. Although this

2 Name and Use of Gives the name of each part and describes how to use it.

Each Part The corresponding reference pages for panel keys and the

3 Before Starting Describes points to watch during use and describes how to

Observation and install the instrument, connect the power cord, turn the power Measurement of switch ON/OFF and connect probes as well as how to set the Waveforms date and time.

4 Common Operations Describes the operations used to make settings, such as start/

5 Setting the Vertical Describes how to turn channels ON/OFF, how to make

and Horizontal Axes settings, such as input coupling, probe attenuation and vertical

6 Activating a Trigger Describes trigger setting operations, such as those for setting

7 Changing Acquisition Describes how to make acquisition condition settings, such as

and Display acquisition mode, sampling mode, input filter and hysteresis, Conditions as well as how to make display condition settings, such as

8 Analyzing Waveforms Describes how to measure waveforms using cursors, perform

9 Performing a Describes how to perform a GO/NO-GO action by setting the

GO/NO-GO Action waveform zone or setting limits for waveform parameters, then

10 Outputting Displayed Describes how to output displayed waveforms (screen

Waveforms and hardcopy) and set-up information to the built-in printer or Setting Parameters plotter connected to the GP-IB interface. to the Printer/Plotter

11 Storing and Recalling Describes how to store displayed waveforms or settings in the

Data from the Internal internal memory, how to recall stored waveform data and Memory display the waveforms, and how to recall settings and change

12 Saving and Loading Describes how to save waveform data or set-up data to a floppy

Data from a Floppy disk, how to load saved data, how to initialize a floppy disk and Disk how to delete data.

13 Saving and Loading Describes how to save waveform data or set-up data to a SCSI

Data from a SCSI device, how to load saved data, how to initialize a SCSI device

Device and how to delete data. 14 Other Operations Describes operations such as those required for trigger output. 15 Troubleshooting, Describes how to diagnose the cause of trouble and how to

Maintenance and correct it, as well as describing each message that may appear

Inspection on the screen and how to perform a self test. 16 Specifications Describes the specifications.

Appendix Shows a menu map, describes the relationship between the time

Index Important terms used in this manual with corresponding

section does not give a description of the operating methods, it will help you to understand the basic operations.

rotary knobs are also given.

stop acquisition, auto set-up and initialization of each setting as well as operations, such as snapshot, clear trace and calibration, that are used frequently during operation.

sensitivity, that are related to the vertical axis (voltage axis), as well as how to make settings related to the horizontal axis (time axis).

trigger mode, trigger type, trigger source and trigger level, that enable you to determine acquisition timing.

waveform expansion, interpolation, accumulation, X-Y display and graticule.

automatic measurement of waveform parameters and waveform math, and how to display the power spectrum obtained by FFT computation.

detecting whether the input signal waveform is within the specified range (zone or limits).

them.

axis, sample rate and record length, and describes the data format which must be specified when waveform data is saved.

reference page numbers are given.

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Conventions Used in this Manual

Unit

k ............. Denotes “1000”. Example: 100kS/s

K ............. Denotes “1024” or “1002”.

• Example of when K indicates “1024” : 640 KB (storage capacity of a floppy disk)

• Example of when K indicates “1002” : 100 KW (record length for acquisition memory)

Used Characters

Alphanumerics enclosed in double quotation marks usually refer to characters and set values that appear on the screen and panel. The SHIFT + xxx key refers to first pressing the SHIFT key (the indicator above the SHIFT key lights), and then pressing the xxx key to obtain another, specified, function.

Symbols Used

The following symbol marks are used in this User's Manual.

To avoid injury or death of personnel, or damage to the instrument, the operator must refer to the User's Manual. In the User's Manual, these symbols appear on the pages to which the operator must refer.

Describes precautions that should be observed to prevent the

WARNING

CAUTION

Note

Symbol Marks Used for Descriptions of Operations

The following symbol marks are used in Chapters 3 to 14 to distinguish certain features in descriptions.

Relevant Keys

Operating Procedure

Keys and Procedure

danger of serious injury or death to the user.

Describes precautions that should be observed to prevent the danger of minor or moderate injury to the user, or the damage to the property.

Provides information that is important for proper operation of the instrument.

Indicates the relevant panel key which are necessary to carry out the operation.

Carry out steps in the order shown. The operating procedures are given with the assumption that you are not familiar with the operation. Thus, it may not be necessary to carry out all the steps when changing settings.

Shows the above mentioned relevant keys and the operating procedure in one block.

Explanation

Describes settings and restrictions relating to the operation. A detailed description of the function is not provided. For a detailed description of the function, refer to Chapter 1.

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Contents

Introduction ........................................................................................................................................................... 1

Checking the Contents of the Package ......................................................................................... 2

Safety Precautions .......................................................................................................................................... 5

How to Use this Manual .............................................................................................................................. 7

Conventions Used in this Manual ...................................................................................................... 8

Chapter 1 Functions

1.1 System Configuration and Block Diagram ................................................................................ 1-1

1.2 Setting the Vertical and Horizontal Axes ................................................................................... 1-2

Input Coupling / Probe Attenuation ........................................................................................................ 1-2

Inverted Waveform Display / Vertical Sensitivity ....................................................................................... 1-3

Vertical Position of the Waveform / Time Axis .......................................................................................... 1-4

1.3 Setting a Trigger ......................................................................................................................... 1-8

Trigger Type / Trigger Source / Trigger Level ........................................................................................... 1-8

Trigger Mode / Action-On Trigger / Trigger Coupling ................................................................................. 1-10

HF Rejection / Trigger Position / Trigger Delay / Trigger Hold-off ................................................................. 1-11

1.4 Setting the Acquisition and Display Conditions ........................................................................ 1-12

Acquisition Modes / Sampling Mode ...................................................................................................... 1-12

Record Length Input Filter / Expanded Waveform ...................................................................................... 1-13

Sequential Store .................................................................................................................................................................... 1-14

History Memory / Display Interpolation .................................................................................................. 1-15

Accumulated Waveform Display / X-Y Waveform Display ........................................................................... 1-16

Other Display Settings ....................................................................................................................... 1-17

1.5 Analyzing the Waveform ........................................................................................................... 1-18

Cursor Measurements / Automated Measurements / Linear Scaling................................................................. 1-18

Waveform Math / Power Spectrum Display.............................................................................................. 1-19

1.6 Other Useful Functions .............................................................................................................. 1-20

Auto Set-up / Initialization / Snapshot / Clear Trace / GO/NO-GO Determination ............................................... 1-20

Making Hardcopy Print-outs / Real-time Printing / Storing and Recalling ......................................................... 1-21

Saving and Loading Data from a Floppy Disk / Saving and Loading Data from a SCSI Device / GP-IB and RS-232-C . 1-22

Chapter 2 Name and Use of Each Part

2.1 Front Panel / Rear Panel / Top View .......................................................................................... 2-1

2.2 Operation keys / Rotary Knob ................................................................................................... 2-2

2.3 Display ....................................................................................................................................... 2-5

Chapter 3 Before Starting Observation and Measurement of Waveforms

3.1 Precautions During Use ............................................................................................................. 3-1

3.2 Installing the Main Unit ............................................................................................................. 3-2

3.3 Connecting the SCSI Cable (for DL1520L with suffix code -C4)............................................. 3-3

3.4 Connecting the Power Cord ....................................................................................................... 3-5

3.5 Turning the Power Switch ON/OFF........................................................................................... 3-6

3.6 Connecting a Probe .................................................................................................................... 3-7

3.7 Compensating the Probe (Phase Correction) ............................................................................. 3-8

3.8 Setting the Date and Time .......................................................................................................... 3-9

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App

Index

Page 11

Chapter 4 Common Operations

4.1 Starting and Stopping Acquisition ............................................................................................. 4-1

4.2 Displaying Waveforms using the Auto Set-up Function ............................................................ 4-2

4.3 Initializing Settings .................................................................................................................... 4-4

4.4 Halting a Waveform and Erasing the Halted Waveform (Snap Shot and Clear Trace).............. 4-5

4.5 Performing Calibration .............................................................................................................. 4-6

4.6 Setting Values ............................................................................................................................. 4-7

4.7 Entering Characters using the Keyboard.................................................................................... 4-8

Chapter 5 Setting the Vertical and Horizontal Axes

5.1 Turning Display of Input Signal Waveforms ON/OFF .............................................................. 5-1

5.2 Setting the Input Coupling ......................................................................................................... 5-2

5.3 Setting the Probe Attenuation .................................................................................................... 5-4

5.4 Inverting a Waveform ................................................................................................................. 5-5

5.5 Setting the Vertical Sensitivity ................................................................................................... 5-6

5.6 Changing the Waveform’s Vertical Position .............................................................................. 5-7

5.7 Selecting the Timebase............................................................................................................... 5-8

5.8 Setting the Time Axis ................................................................................................................. 5-10

5.9 Changing the Waveform’s Horizontal Position.......................................................................... 5-12

Contents

Chapter 6 Activating a Trigger

6.1 Relationship between Trigger Type and Trigger Source/Slope/Level ....................................... 6-1

6.2 Setting the Edge Trigger ............................................................................................................ 6-2

6.3 Setting the Window Trigger ....................................................................................................... 6-4

6.4 Setting the TV Trigger................................................................................................................ 6-5

6.5 Setting the OR Trigger (Optional for DL1540/DL1540L)......................................................... 6-7

6.6 Setting the Pattern Trigger (Optional for DL1540/DL1540L) ................................................... 6-8

6.7 Setting the Width Trigger (Optional for DL1540/DL1540L) .................................................... 6-10

6.8 Setting the Trigger Mode ........................................................................................................... 6-12

6.9 Setting the Action-On Trigger .................................................................................................... 6-14

6.10 Setting the Trigger Coupling and HF Rejection......................................................................... 6-16

6.11 Changing the Trigger Position ................................................................................................... 6-17

6.12 Setting the Trigger Delay ........................................................................................................... 6-18

6.13 Setting the Hold-off Time .......................................................................................................... 6-19

Chapter 7 Changing Acquisition and Display Conditions

7.1 Selecting Acquisition Mode, Sampling Mode, and Record Length for DL1520L/DL1540L ... 7-1

7.2 Setting the Input Filter ............................................................................................................... 7-3

7.3 Zooming the Waveform ............................................................................................................. 7-4

7.4 Acquiring Waveforms using the Sequential Store Function (for DL1520L/DL1540/DL1540L) .. 7-7

7.5 Using the History Memory Function (for DL1520L/DL1540/DL1540L) ................................. 7-9

7.6 Changing the Interpolation Settings ........................................................................................... 7-11

7.7 Displaying an Accumulated Waveform ...................................................................................... 7-12

7.8 Displaying an X-Y Waveform .................................................................................................... 7-13

7.9 Changing the Graticule, Scale and %Marker Settings ............................................................... 7-14

7.10 Turning the Waveform Information Display ON/OFF ............................................................... 7-15

7.11 Changing the Screen Intensity ................................................................................................... 7-16

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Contents

Chapter 8 Analyzing Waveforms

8.1 Measuring a V-T Waveform using Cursors ................................................................................ 8-1

8.2 Measuring an X-Y Waveform using Cursors ............................................................................. 8-5

8.3 Measuring Waveform Parameters Automatically ...................................................................... 8-7

8.4 Using the Linear Scaling Function ............................................................................................. 8-14

8.5 Performing Waveform Math (Addition, Subtraction and Multiplication) ................................. 8-16

8.6 Displaying the Power Spectrum (Performing FFT Computation) ............................................. 8-18

8.7 Measuring the Power Spectrum using Cursors .......................................................................... 8-19

Chapter 9 Performing a GO/NO-GO Action

9.1 Judging using a Waveform Zone ................................................................................................ 9-1

9.2 Judging using Measured Values of Waveform Parameters ........................................................ 9-8

9.3 Using the GO/NO-GO Signal Output Function (for DL1540/DL1540L) ................................. 9-13

Chapter 10 Outputting Displayed Waveforms and Set-up Information to the

Printer/Plotter

10.1 Loading a Chart in the Optional Built-in Printer ....................................................................... 10-1

10.2 Printing Waveforms and Additional Information using the Optional Built-in Printer ............... 10-3

10.3 Real-Time Printing using the Optional Built-in Printer ............................................................. 10-6

10.4 Connecting an External Plotter .................................................................................................. 10-7

10.5 Printing Displayed Waveforms and Additional Information using an External Plotter ............. 10-8

10.6 Entering a Comment .................................................................................................................. 10-10

10.7 Printing the Screen Image to an External Printer

(for DL1520/DL1520L with suffix code -C3) .......................................................................... 10-11

Chapter 11 Storing and Recalling Data from the Internal Memory

11.1 Storing and Recalling Displayed Waveforms ............................................................................ 11-1

11.2 Storing and Recalling Setting Parameters .................................................................................. 11-3

Chapter 12 Saving and Loading Data from a Floppy Disk

12.1 Floppy Disks .............................................................................................................................. 12-1

12.2 Formatting a Floppy Disk .......................................................................................................... 12-2

12.3 Saving and Loading Waveform Data ......................................................................................... 12-4

12.4 Saving and Loading Setting Parameters .................................................................................... 12-9

12.5 Saving Screen Image Data ......................................................................................................... 12-11

12.6 Deleting and Protecting Saved Data .......................................................................................... 12-14

Chapter 13 Saving and Loading Data from the SCSI Device

(for DL1520L with suffix code -C4)

13.1 Selecting the SCSI Device ......................................................................................................... 13-1

13.2 Formatting the Media ................................................................................................................. 13-2

13.3 Saving and Loading Waveform Data ......................................................................................... 13-4

13.4 Saving and Loading Setting Parameters .................................................................................... 13-9

13.5 Saving Screen Image Data ......................................................................................................... 13-11

13.6 Deleting and Protecting Saved Data .......................................................................................... 13-14

App

Index

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Chapter 14 Other Operations

14.1 Using a Trigger Output Signal (for DL1540/DL1540L) ........................................................... 14-1

14.2 Downloading Waveform Data to an AG Arbitrary Waveform Generator.................................. 14-2

14.3 Checking the System Condition ................................................................................................. 14-3

14.4 Adjusting the Printer Density ..................................................................................................... 14-4

Chapter 15 Troubleshooting, Maintenance and Inspection

15.1 Troubleshooting ......................................................................................................................... 15-1

15.2 Error Messages and Corrective Actions ..................................................................................... 15-3

15.3 Self Test...................................................................................................................................... 15-7

15.4 Replacing the Power Supply Fuse ............................................................................................. 15-8

15.5 Recommended Parts for Replacement ....................................................................................... 15-9

Chapter 16 Specifications

16.1 Input Section .............................................................................................................................. 16-1

16.2 Trigger Section ........................................................................................................................... 16-2

16.3 Time Axis ................................................................................................................................... 16-3

16.4 Display ....................................................................................................................................... 16-3

16.5 Functions .................................................................................................................................... 16-4

16.6 Rear Panel Input/Output Section ................................................................................................ 16-5

16.7 Communication Interface ........................................................................................................... 16-6

16.8 Built-in Printer ........................................................................................................................... 16-7

16.9 Built-in Floppy Disk Drive ........................................................................................................ 16-7

16.10 General Specifications ............................................................................................................... 16-8

16.11 External Dimensions .................................................................................................................. 16-10

Contents

Appendix

Index

Appendix 1 Menu Map ....................................................................................................................... App-1

Appendix 2 Relationship between the Time Axis Setting, Sample Rate and Record Length

(for DL1520/DL1540) .................................................................................................... App-2

Appendix 3 Relationship between the Time Axis Setting, Sample Rate and Record Length

(for DL1520L/DL1540L) ............................................................................................... App-5

Appendix 4 How to Calculate the Area of a Waveform ..................................................................... App-11

Appendix 5 Output Data Format used When Saving Waveform Data (Example DL1540L) ............ App-12

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2.1 Front Panel / Rear Panel / Top View

Front Panel (2 channels are provided with DL1520/DL1520L.)

Time axis setting knob

→Page 5-10

Floppy disk drive

Saving and loading of data from the

CRT screen

Description of display contents →Page 2-5

floppy disk →Chapter 12

Rotary knob

Used to enter setting values and selections

Name and Use of Each Part

Front panel keys

Description of each key →Pages 2-2 to 2-4

Power switch

Description of ON/OFF operation →Page 3-4

This key is not provided with DL1520/DL1520L.

CAL signal output terminal

Outputs a calibration signal for a probe. →Page 3-6

Function grounding terminal

Used to connect the ground line to calibrate a probe.

Input terminals

Used to connect a probe. →Page 3-5

(For DL1540/DL1540L, CH1 to CH4 input terminals are provided. For DL1520/DL1520L, CH1 and CH2 input terminals and an external trigger /external clock terminal are provided.)

Rear Panel (Varies depending on the model. Refer to the their individual specifications.)

GP-IB connector

Used to connect an external plotter. Connection method →Page 10-7 For a description of communications functions, refer to the Communication Interface User's Manual (IM 701510-11E). (For DL1520/DL1520L, a RS-232-C connector is provide depending on its specifications.)

Top View

Connector for half pitch interface

(For DL1520/DL1520L, a Centronics connector is provided depending on its specifications.)

Vent holes

Trigger output terminal

How to use the trigger output signal →Page 14-1 (Not provided with DL1520/DL1520L.)

External trigger/clock input terminal

Description of external trigger →Page 6-3 Description of external clock →Page 5-8 (Provided on the front panel in the case of DL1520/DL1520L.)

Vent holes

Power connector

Connection method →Page 3-5

Power supply fuse

For fuse replacement →Page 15-8

Support

Use the support to use this instrument with the display facing upwards.

Rear panel

IM 701510-01E

Built-in printer (optional)

How to output data to the printer →Chapter 10

Vent holes

Handle

Hold the instrument by these handles  when you carry it.

Front panel

2-1

Page 15

2.2 Operation Keys / Rotary Knob

Operation keys provided with DL1540/DL1540L are shown below. For DL1520/DL1520L,

keys relating to CH3 and CH4 and HISTORY key are not provided.

Keys and Rotary Knob used for Various Functions

CLEAR TRACE key (Page 4-5)

Deletes the snapshot waveform or accumulated waveform. Also used to re-start averaging and  repetitive time sampling.

Soft keys

CLEAR TRACE

AUTO-SETUP

VERTICAL 



Used to make settings corresponding to the soft key menu displayed above the keys.

CURSOR

MEASURE

ON/OFF

V/DIV

INPUT

FILTER

HORIZONTAL 

POSITION

TIME/DIV

REMOTE

LOCAL

+/-

INITIALIZE

CH

1



POSITION

INITIALIZE key (Page 4-4)

Displays the initialization menu which can be used to reset the settings to  their default values.

AUTO-SETUP key (Page 4-2) Displays the auto setup menu which

can be used to execute auto setup.

DISPLAY FORM

GO/NO-GO

ZOOM

FFT

MATH

TRIGGER

CAL

DISPLAY

TYPE

MODE

ACTION



POSITION/

LEVEL/

DELAY

SOURCE

COUPLING

HOLD OFF

MISC

HISTORY

KEYBOARD MENU

SHIFT+MISC (KEYBOARD key)

(Page 4-7) Displays a keyboard which enables you to enter values directly. 

CAL key (Page 4-6) Displays the calibration execution menu.

ESC key

Deletes the currently displayed menu.

SNAP SHOT

ESC

RESET



TRIG'D

SELECT

ACQ

STORE/RECALL

START/STOP

COPY

FILE

SHIFT

RESET key

Resets the settings made using the  rotary knob to their default settings.

SNAP SHOT key (Page 4-5) Retains the waveform which is displayed 

when this key is pressed, even if updating  is performed.

SELECT key

Confirms the items and characters  selected.

Rotary knob

Used to set values, move the cursor,  and select the desired items.

<> key

Used to shift from one digit to the next  of the value you are setting using the  rotary knob.

START/STOP key (Page 4-1) Starts or stops acquisition.

The indicator on this key is lit during acquisition.

SHIFT key

Used to operate functions written in blue over/under the operation keys.

Keys and Rotary Knob used for Setting the Vertical/Horizontal Axis

V/DIV key (Page 5-6)

Displays the voltage axis sensitivity setting menu for each channel. For DL1520/DL1520L, keys relating to CH3 and CH4 are not provided.

CH key (Page 5-1) Turns ON/OFF display of the waveform for each channel. The indicator above the key is lit when the display is ON. For DL1520/1520L, keys relating to CH3 and CH4 are not provided.

CLEAR TRACE

AUTO-SETUP

INITIALIZE

VERTICAL

ON/OFF

V/DIV

POSITION

INPUT

MEASURE

FILTER

+/-

POSITION key (Page 5-12)

Displays the horizontal position setting menu.

DISPLAY FORM

CURSOR

HORIZONTAL

POSITION

TIME/DIV

REMOTE

LOCAL

GO/NO-GO

ZOOM

FFT

MATH

TRIGGER

CAL

DISPLAY

TRIG'D

TYPE

MODE

ACTION

POSITION/

LEVEL/ SOURCE

COUPLING

KEYBOARD MENU

MISC

DELAY

HOLD OFF

HISTORY

ESC

RESET

SELECT

ACQ

STORE/RECALL

FILE

Time axis setting knob (TIME/DIV)

INPUT key (Pages 5-2 to 5-5)

Sets the input coupling, probe attenuation,

(Page 5-10) Used to change the time axis scale.

inverted display, and acquisition hold. For DL1520/DL1520L, keys relating to CH3 and CH4 are not provided.

POSITION key (Page 5-7) Displays the vertical position setting menu for each displayed waveform. For DL1520/DL1520L, keys relating to CH3 and CH4 are not provided.

SNAP SHOT

START/STOP

COPY

Rotary knob

Used to make vertical axis sensitivity (V/div), waveform vertical/horizontal position and offset voltage settings.

SHIFT

2-2

IM 701510-01E

Page 16

Keys and Rotary Knob used for Making Trigger Settings



TRIG’D indicator

Lights up when a trigger is activated. 

TYPE key

Displays the trigger type selection menu.

CLEAR TRACE

AUTO-SETUP

INITIALIZE

VERTICAL 

CH

1



ON/OFF

CH



V/DIV

POSITION

INPUT

FILTER

+/-

HORIZONTAL 

POSITION

TIME/DIV

REMOTE

LOCAL

ZOOM

CAL

GO/NO-GO

CURSOR

MEASURE

LEVER/SOURCE key

Displays the trigger source selection menu.

COUPLING key (Page 6-16) Displays the trigger coupling setting  menu.

FFT

MATH

TRIGGER

TYPE



LEVEL/ SOURCE

COUPLING

MISC

KEYBOARD MENU

ESC



TRIG'D

MODE

ACTION

RESET

SELECT

ACQ

STORE/RECALL

FILE

DISPLAY FORM

DISPLAY

POSITION/

DELAY

HOLD OFF

HISTORY

POSITION/DELAY key (Pages 6-17, 6-18)

Displays the trigger position/trigger delay setting menu.

HOLD OFF key (Page 6-19) Displays the holdoff time setting menu. 

2.2 Operation Keys / Rotary Knob

MODE key (Page 6-12)

Displays the trigger mode selection menu.

SHIFT+MODE(ACTION) key (Page 6-14) Displays the action-on-trigger selection menu.

SNAP SHOT

RESET key

Resets the settings made using the  rotary knob to their default settings.

Rotary knob

Used to set the trigger level, trigger position and trigger delay.

<> key

START/STOP

COPY

SHIFT

Used to shift from one digit to the  next of the value you are setting using the rotary knob.

Name and Use of Each Part

Keys and Rotary Knob used for Setting Acquisition and Display Conditions

DISPLAY key (Pages 7-7 to 7-13)

Displays the waveforms for the sequential store and history memory, and the setting menu for interpolation, X-Y and  accumulate settings.

SHIFT+DISPLAY(DISPLAY FORM) key (Pages 7-14 to 7-16) Displays the display condition setting menu to make display  interpolation, graticule/scale % marker and intensity settings.

SNAP SHOT

RESET key

Resets the settings made using the rotary  knob to their default settings.

Rotary knob

Used to set the number of execution times  for averaging, expansion rate and position,  accumulate time and brightness of the screen.

<> key

START/STOP

COPY

SHIFT

Used to shift from one digit to the next of the value you are setting using the rotary knob.

ACQ key (Page 7-1) Displays the menu used to make acquisition  mode and sampling mode settings.

SHIFT+ACQ(HISTORY) key (Page 7-9)

For DL1520L, displays the history memory setting menu.  For DL1520L, "HISTORY" character indicated over ACQ key 

CLEAR TRACE

AUTO-SETUP

INITIALIZE

VERTICAL 

CH

1



ON/OFF

CH



V/DIV

POSITION

INPUT

FILTER key (Page 7-3)

Displays the input filter setting menu. The indicator above the key is lit when  a band limit is set.

FILTER

+/-

HORIZONTAL 

POSITION

TIME/DIV

REMOTE

LOCAL

ZOOM

CAL

GO/NO-GO

CURSOR

MEASURE

ZOOM key (Page 7-4)

Displays the expansion setting menu.

ESC



TRIG'D

MODE

ACTION

RESET

SELECT

HISTORY

ACQ

STORE/RECALL

FILE

DISPLAY FORM

FFT

MATH

TRIGGER

DISPLAY

TYPE



POSITION/

LEVEL/

DELAY

SOURCE

COUPLING

HOLD OFF

MISC

HISTORY

KEYBOARD MENU

HISTORY key (Page 7-9)

Displays the history memory setting menu.  (Not provided with DL1520/DL1520L.)

IM 701510-01E

2-3

Page 17



2.2 Operation Keys / Rotary Knob

Keys and Rotary Knob used for Analysis of Waveforms

MEASURE key (Page 8-6)

Displays the setting menu for automated  measurement of waveform parameters.

CURSOR key (Pages 8-1, 8-5 and 8-19) Displays the setting menu for cursor measurement.

CLEAR TRACE

ESC

SNAP SHOT

RESET key 

Resets the settings made using the  rotary knob to their default values.

DISPLAY FORM

AUTO-SETUP

INITIALIZE

VERTICAL 

CH



1



POSITION

ON/OFF

V/DIV

INPUT

FILTER

+/-

GO/NO-GO key (Pages 9-1 and 9-8)

Displays the GO/NO-GO setting menu.

MEASURE

HORIZONTAL 

CURSOR

POSITION

REMOTE

GO/NO-GO

ZOOM

TIME/DIV

LOCAL

FFT

MATH

DISPLAY

MISC



TRIG'D

MODE

ACTION

POSITION/

DELAY

HOLD OFF

HISTORY

SELECT

TRIGGER

TYPE

LEVEL/ SOURCE

COUPLING

CAL

KEYBOARD MENU

MATH key (Page 8-16)

Displays the waveform computation menu.

SHIFT + MATH(FFT) key (Page 8-18) Displays the FFT computation menu.

MISC key (Page 8-14) Used to set the linear scaling function.

Keys and Rotary Knob used for Other Operations

LOCAL key

Clears the remote state. The REMOTE indicator is lit while remote mode is active. Refer to the Communication Interface User's Manual (IM 701510-11E).

CLEAR TRACE

ESC

RESET

ACQ

STORE/RECALL

FILE

START/STOP

COPY

SNAP SHOT

SHIFT

SELECT key

Confirms the items and characters  selected. 

Rotary knob

Used to select cursor position, waveform parameters, linear scaling, phase shift,  FFT computation, etc.

<> key

Used to shift from one digit to the next of  the value you are setting using the rotary  knob.

RESET key

Resets the settings made using the rotary knob to their default values.

AUTO-SETUP

INITIALIZE

VERTICAL

ON/OFF

V/DIV

POSITION

INPUT

FILTER

+/-

MEASURE

CURSOR

HORIZONTAL

POSITION

TIME/DIV

REMOTE

LOCAL

ZOOM

CAL

GO/NO-GO

MISC key (Pages 14-2 to 14-4, 15-7)

Displays the MISC menu used to make communications, date and time settings, confirm system condition, perform a self test and make system configuration setting.

2-4

TRIG'D

MODE

ACTION

RESET

SELECT

ACQ

STORE/RECALL

FILE

DISPLAY FORM

FFT

MATH

TRIGGER

DISPLAY

TYPE

POSITION/

LEVEL/

DELAY

SOURCE

COUPLING

HOLD OFF

MISC

HISTORY

KEYBOARD MENU

SELECT key

Used to input the file name, for selection and confirmation.

Rotary knob

Used to select the desired setting items or values.

START/STOP

COPY

SHIFT

COPY key (Chapter 10, Page 12-11)

Used for outputting to internal printer, external plotter, hard copy of screen image data, etc.

SHIFT + COPY(MENU)

(Chapter 10, Page 12-11) Displays the setting menu for outputting to the internal printer, external plotter, and for

STORE/RECALL key (Chapter 11)

hard copy of screen image data, etc.

Displays the store/recall menu used to store or recall displayed waveforms and setting parameters from the internal memory.

SHIFT + STORE/RECALL(FILE) key (Chapter 12 and 13) Displays the setting menu used to save/load data to/from the floppy disk or the SCSI device. The menu for operating the SCSI device is displayed only on the DL1520L with suffix code -C4.

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Page 18

2.3 Display

An example of screen displayed on DL1540/DL1540L is shown below. For DL1520/ DL1520L, waveforms and data relating to CH3 and CH4 are not displayed.

Normal Waveform Display

Information concerning waveform acquisiton

No display Stopped Waiting for trigger

Trigger level mark

Trace No.

. . . . . .

acquisition in progress

Information concerning waveforms →Page 7-15

. . .

CH2

Signal waveform of channel 2

. . .

20V

Voltage axis sensitivity is 20V/div

. . .

Input coupling

. . .

10:1

Probe attenuation

Trigger position

Date and time →Page 3-7

Time axis setting →Page 5-10

Sample rate → App.2/App.3

In case of the repetitive sampling mode, [REP] is added

Acquisition mode → Page 7-1

NORM ENV AVG

. . .

Normal mode

. . .

Envelope mode

. . .

Averaging mode

Name and Use of Each Part

Ground level mark

Automated Measurements

→→

→ Refer to page 8-7.

→→

T2 cursorT1 cursor

Graticule → Page 7-14

Rotary knob menu

Shows values and settings which can be adjusted by rotary knob

Soft key menu

Press the corresponding key below when you want to change any setting (For DL1520/DL1520L, CH2 and CH3 are not displayed.)

Measurement values

IM 701510-01E

Trace No.

Measurement items or delay  between channels

2-5

Page 19



2.3 Display

Expanded Display

Recalled Waveform

→→

→ Refer to page 7-4.

→→

→ Refer to page 11-1.

→→

Channel No. switches to "MEM" when a recalled waveform is displayed. The voltage axis sensitivity of the recalled waveform is displayed as well.

Expansion (zoom) box

Pre-zoom waveform

Time axis setting of the expanded waveform

Expanded waveform

Expansion rate

Expansion setting menu

Recalled waveform

Input signal waveform

Destination selection menu

Recall menu

(For DL1520/DL1520L, LOAD3 and LOAD4 are not displayed.)

2-6

IM 701510-01E

Page 20

3.1 Precautions During Use

Safety Precautions

When using this instrument, thoroughly read the “Safety Precautions” given on page 4 and

5. In addition, pay attention to the following points:

Do not remove the cover from the instrument

Some parts of the instrument use high voltages, which are extremely dangerous. When the instrument needs internal inspection or adjustment, contact your dealer or nearest YOKOGAWA representative as listed on the back cover of this manual.

Unusual occurrences

If you notice smoke or unusual odors coming from the instrument, turn OFF the power and unplug the power cord immediately. Contact your dealer or the nearest YOKOGAWA representative as listed on the back cover of this manual.

Power cord

Nothing should be placed on the power cord; also, it should be kept away from any heat sources. When unplugging the power cord from the AC outlet, never pull the cord itself. Always hold the plug and pull it. If the power cord is damaged, contact your dealer. Refer to page 2 for the part number to quote when placing an order.

General Handling Precautions

Never place anything on top of the instrument

Never place another instrument or any objects containing water on top of the instrument, otherwise a breakdown may occur.

Do not subject the input terminals or connecting cables to shock

Shock to the input terminals or connecting cables may turn into electrical noise and enter the instrument via the signal lines.

Before Starting Observation and Measurement of Waveforms

When the instrument is not going to be used for a long period

Unplug the power cord from the AC outlet.

CRT Screen

It is recommended to use weak contrast settings so as not to burn in the screen.

When moving the instrument

Disconnect the power cord and connecting cables. Always carry the instrument by the handles or carry it with both hands as shown on the right. Note that the chart paper might show some discoloration due to friction after the instrument is moved with the roll paper installed. In such a case, we recommend to remove and re-install the chart paper again. For details on the procedure, refer to page 10-1.

Cleaning

For cleaning the case and the operation panel, unplug the power cord first, then gently wipe with a dry, soft and clean cloth. Do not use chemicals such as benzene or thinner, since these may cause discoloration or damage.

IM 701510-01E

3-1

Page 21

3.2 Installing the Main Unit



Installation Position

Place the instrument in a flat, horizontal position as shown in the figure below. To tilt the

screen slightly forwards, use the support, as shown below also.

When using the support, pull it forwards until it is at right angles to the bottom of the

instrument, and lock it. If you are installing the instrument in a slippery place, attach the

rubber stoppers to all feet to prevent the instrument from sliding.

Installation Conditions

The instrument must be installed in a place where the following conditions are met.

Ambient temperature and humidity

Ambient temperature: 5 to 40 °C

To ensure high measurement accuracy, ambient temperature should be 23 ±2 °C.

Ambient humidity: 20 to 80% RH

No condensation should be present. To ensure high measurement accuracy, ambient

humidity should be 55 ±10% RH.

Support

Flat, horizontal locations

Place the instrument in a stable location, which is horizontal in each direction. Operating the

instrument in an unstable location may hinder recording of the printer and accurate

measurement.

Well-ventilated location

Vent holes are situated on the left side of the instrument. In addition, vent holes for the

cooling fan are also situated in the rear panel. To prevent a rise in the internal temperature,

the vent holes should not be blocked and sufficient clearance should be maintained around

them.

5 cm or more

5 cm or  more

2 cm or  more

If the instrument is equipped with a built-in printer or when the GP-IB cable is connected,

make sure to allow sufficient space for operations in addition to the space for the vent holes.

Never install the instrument in any of the following places.

• In direct sunlight or near heat sources

• Where an excessive amount of soot, steam, dust or corrosive gases are present.

• Near strong magnetic field sources

• Near high voltage equipment or power lines

• Where the level of mechanical vibration is high

• In an unstable place

3-2

Note

Internal condensation may occur if the instrument is moved to another place where both the ambient temperature and humidity are higher, or if the temperature changes rapidly. In such cases allow the instrument to acclimatize to its new environment for at least one hour before starting operation.

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Page 22

3.3 Connecting the SCSI cable (for DL1520L with suffix code -C4)

Name, position and pin cofigurationo of the SCSI cable connector

• Name : OPTION

• Position : Real panel of DL1520L

• Pin configuration

Pin No. Signal name Pin No. Signal name Pin No. Signal name

1 to 12 GND 32 -DB6 43 -BSY 13 NC 33 -DB7 44 -ACK 14 to 25 GND 34 -DBP 45 -RST 26 -DB0 35 to 37 GND 46 -MSG 27 -DB1 38 TERMPWR 47 -SEL 28 -DB2 39,40 GND 48 -C/D 29 -DB3 41 -ATN 49 -REQ 30 -DB4 42 GND 50 -I/O 31 -DB5

Before Starting Observation and Measurement of Waveforms

Other necessary equipment

SCSI Device

SCSI devices which can send and receive data over SCSI and can set the ID number to "5" can be connected the instrument. There are exceptions as in the case when the media used on the SCSI device is formatted with another equipment such as a PC, or the pin configuration of the connector is different. Refer to section 16.7, for the SCSI specification. Also, for information on general precautions in using the SCSI device, refer to the instruction manual for that device.

SCSI cable

SCSI cables should have the connector shape and pin configuration which match the "OPTION" connector on the rear panel of the DL1520L (refer to the figure above). They should be less than 3 m long with a characteristic impedance between 90 and 132 Ω. Also, attach a ferrite core (TDK:ZCAT2035-0930A) on each end of the cable.

Terminator

Some SCSI devices require terminators. Follow the instruction manual for the SCSI device.

Note

DL1540/DL1540L with software (ROM) version 1.20 or later can save/load data from the SCSI device through the SCSI interface unit 700930 (sold separately). For details, refer to the instruction manual for the SCSI interface unit 700930, IM700930-01E.

244923

(Rear panel)

OPTION

125

2273

Pin No.

2650

IM 701510-01E

3-3

Page 23

3.3 Connecting the SCSI cable (for DL1520L with suffix code -C4)

Connecting the SCSI cable

CAUTION

• When connecting or disconnecting the SCSI cable, turn the power switches OFF on all equipment. Not doing so may cause malfunction, or damage the equipment.

• Never short the connector pins on any equipment or externally apply voltage to them. It may damage the equipment.

Before connecting

1. Make sure to read the instruction manuals thoroughly and have a good understanding on

all equipment being connected beforehand.

2. Turn the power switches OFF on all equipment that are being connected.

Connecting DL1520L and the SCSI device

3. Connect one end of the SCSI cable to the connector "OPTION" on the rear panel of this

unit.

4. Connect the other end of the SCSI cable to the connector on the SCSI device.

5. Set the ID number of the SCSI device to "5."

DL1520L digital oscilloscope (suffix code -C4)

"OPTION" connector

SCSI cable (To be provided by the customer)

SCSI device

Note

DL1520L with suffix code -C4 can connect one SCSI device to the "OPTION" connector.

3-4

IM 701510-01E

Page 24

3.4 Connecting the Power Cord

Before Connecting the Power

Make sure that you perform the following steps before connecting the power. Failure to do so may cause electric shock or damage to the instrument.

WARNING

• Connect the power cord after confirming that the voltage of the power supply complies to the rated electric power voltage for this instrument.

• Connect the power cord after confirming that the power switch is OFF.

• Always use protective ground to prevent electric shock. Connect the accessory power cord to a power outlet with grounding terminal.

• Do not use non-grounding extension cords or other measures that defect the protective grounding.

• Never use an extension cord that does not have protective grounding, otherwise the protection feature will be negated.

Connecting the Power Cord

1. Make sure that the main power switch is OFF.

2. Plug the power cord into the power connector socket on the rear panel of the instrument.

3. Plug the other end of the power cord into an AC outlet that meets the following

specifications. The AC outlet must be of 3-pin type with a protective grounding terminal.

Item DL1540, DL1540L DL1520, DL1520L

Rated supply voltage 100 to 120 VAC/220 to 240 VAC 100 to 120 VAC 200 to 240 VAC Permitted supply voltage range 90 to 132 VAC/180 to 264 VAC 90 to 132 VAC 180 to 264 VAC Rated supply voltage frequency 50/60 Hz 50/60 Hz 50/60 Hz Permitted supply voltage frequency range 48 to 63 Hz 48 to 63 Hz 48 to 63 Hz Maximum power consumption 220 VA/280 VA 130 VA 140 VA

(when the built-in printer is used)

Typical power consumption 150 VA (at 100 VAC) 75 VA (at 100 VAC) 85 VA (at 200 VAC)

(when the built-in printer is not used) /190 VA (at 200 VAC)

Suffix code -1 and -5 Suffix code -1 Suffix code -5

Before Starting Observation and Measurement of Waveforms

3-pin AC outlet

Power cord (supplied with instrument)

IM 701510-01E

3-5

Page 25

3.5 Turning the Power Switch ON/OFF

Points to be Checked before Turning ON the Power

Check that the instrument is correctly installed as described in Section 3.2 “Installing the Main Unit” (page 3-2). Check that the SCSI cable is correctly connected as shown in Section 3.3 "Connecting the SCSI cable (for DL1520L with suffix code -C4)" (page 3-3). Check that the power cord is correctly connected as shown in Section 3.4 “Connecting the Power Cord” (page 3-5).

Location of the Power Switch

The power switch is located on the front panel in the lower left corner.

Turning the Power ON/OFF

The power switch is a push-button type switch, and the power is turned ON and OFF alternately as the switch is pressed.

OFF ON

The Order in Turning the Power Switches ON/OFF

When peripheral devices are connected to the half pitch interface connector of the this instrument, turn ON the power switches on all peripheral devices first, then turn ON the power switch of this instrument. When turning OFF the power, reverse the order.

Response at Power ON

Calibration (correction of the ground level and gain etc.) starts automatically when the power switch is turned ON. Front panel keys are not operative during calibration (which lasts approximately seven seconds). When calibration has been completed, the normal waveform display screen will appear.

Note

If calibration does not start when the power is turned ON, or if the normal waveform display screen does not appear, check the following points.

• Check that the power cord is plugged in properly.

• Check that the correct voltage is being supplied from the AC outlet. (Refer to page 3-5.)

• Check that the fuse is not blown. (Refer to page 15-8.)

• If the power switch is turned ON while the INITIALIZE key is pressed, all settings will be reset to the factory settings. For details, refer to Section 4.3 “Initializing Settings” (page 4-4).

If there is still no power even after the above points have been checked, contact your nearest YOKOGAWA representative as listed on the back cover of this manual.

For Accurate Observation and Measurement

Turn the power switches ON and allow the unit to warm up for approximately 30 minutes. Just before starting observation/measurement, perform calibration. The ground level and gain etc. will be corrected. For a description of the calibration method, refer to Section 4.5 “Performing Calibration” (page 4-6).

Response at Power OFF

3-6

Settings made prior to turning OFF the power are retained. This allows display of waveforms using these saved settings the next time the power is turned ON.

Note

The settings are backed up by a lithium battery. The battery lasts for approximately five years if it is used at an ambient temperature of 23 °C. When the battery runs out, an icon Li appears in the top left of the screen. In this case, the battery needs to be replaced immediately. The battery cannot be replaced by the user. Contact your nearest YOKOGAWA representative as listed on the back cover of this manual.

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Page 26

3.6 Connecting a Probe

Input Terminals

A probe (or an input cable such as a BNC cable) must be connected to one of the input terminals (CH1 to CH4, CH1 and CH2 for DL1520/DL1520L) located on the lower section of the front panel. The input impedance is 1 MΩ ±1.5% and approximately 25 pF.

CAUTION

The maximum input voltage is 250 V (DC + ACpeak) or 177 Vrms when the frequency is 1 kHz or less. Never input a voltage exceeding this level, as it could damage the input section of the instrument. If the frequency exceeds 1 kHz, the input section may be damaged even when the voltage is below 250 V.

Before Starting Observation and Measurement of Waveforms

Points to Note when Connecting a Probe

• When connecting a probe to the instrument for the first time, perform phase correction of the probe as described in the next section on page 3-7. Failure to do so may result in unstable gain across different frequencies, thereby preventing correct measurement. Calibration must be performed for each channel.

• If the object to be measured is connected to the instrument directly, without using a probe, correct measurement cannot be performed due to the load effect.

Probe

Specifications for the probe (700998) supplied with the instrument (after calibration)

Item Specifications Conditions

Setting 10:1 Setting 1:1

Input impedance/capacitance 10 MΩ ±2%/approx. 14 pF 1 MΩ ±1.5%/approx. 100 pF When used with this instrument Attenuation ratio 10:1 ±2.5% — When used with this instrument

Frequency band DC to 150 MHz DC to 6 MHz When used with this instrument Rise time 2.4 ns or less 58 ns or less When used with this instrument Maximum input voltage 600 V (DC + ACpeak) *1 —

or 424 Vrms,

Frequency is 100 kHz or lower Connector type BNC BNC — Total length 1.5 m 1.5 m —

*1 When the probe's attenuation ratio is “1:1,” never input voltage exceeding the maximum input voltage of this instrument.

1MΩ/25pF ≤ 250Vpk

CHCHCH

Example (DL1540/DL1540L)

IM 701510-01E

When using a probe other than the one supplied with the instrument

To measure a signal which contains harmonics of approximately 150 MHz, use a probe with a frequency band of 150 MHz or higher. Correct measured values cannot be displayed if the probe’s attenuation ratio is not “1:1”, “10:1”, “100:1” or “1000:1”. When a probe other than 1 MΩ probe (for example a 50 Ω probe) is to be used, connect a through-type 50 Ω terminator

*2 When placing an order for the 50 Ω terminator as the one supplied with the instrument, quote the

number “700976”.

for impedance matching.

Setting the probe attenuation

Follow the operating procedure given in Section 5.3 “Setting the Probe Attenuation” (page 5-4) so that the probe’s attenuation matches the one displayed below “Probe” in the soft key menu which appears when the INPUT key is pressed. If they do not match, measured values cannot be read correctly.

3-7

Page 27

3.7 Compensating the Probe (Phase Correction)

CAUTION

Never apply an external voltage to the CAL terminal, as damage to the instrument may result.

Operating Procedure

1. Turn ON the power switch.

2. Connect the probe to the input terminal to which the signal is to be applied.

3. Touch the probe’s tip against the CAL output terminal and connect the grounding wire

4. Press the AUTO-SETUP key.

5. Press the “EXEC” soft key. The calibration signal is displayed on the screen.

6. Insert a screwdriver into the trimmer adjusting hole in the probe and turn the trimmer so

Explanation

Reason for probe compensation

If the probe’s input capacitance is outside the specified range, the gain will not be constant across different frequencies, preventing display of the correct waveforms. The input capacitance varies depending on the probe used, so the variable capacitor (trimmer) provided on the probe must be adjusted. Probe compensation must be performed when the probe is to be used for the first time. Moreover, the appropriate input capacitance varies according to which channel is used, so probe compensation is required when the probe is switched from one channel to another.

to the grounding function terminal.

that the displayed waveform becomes square.

Phase adjusting hole

CAL signal output terminal

Grounding function terminal

Calibration signal

A CAL signal (square waveform) of the following characteristics is output from the CAL terminal on the front panel. Frequency : Approx. 1 kHz Amplitude : Approx. 1 V

Waveform differences

Correct waveform Over-compensated

(gain is too high at high frequency)

Under-compensated (gain is too low at high frequency)

3-8

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3.8 Setting the Date and Time

Keys and Procedure

Rotary knob

SELECT key

ESC key

Soft keys

MISC key

1. Press the MISC key to display the MISC menu.

2. Press the “Date/Time” soft key to display the DATE/TIME setting

menu.

Turning the Date/Time ON/OFF

3. Turn the rotary knob to select “Mode”, and select “ON” or “OFF” using the SELECT key.

Setting the Date/Time

4. Turn the rotary knob to select “Year”, “Month”, “Day”, “Hour”,

“Minute” or “Second”. Press the SELECT key to display the setting screen.

5. Set the required value using the rotary knob.

6. Press the SELECT key or the ESC key to close the setting screen.

7. Repeat steps 4 to 6 until all necessary items are set.

8. Turn the rotary knob to select “SET” and press the SELECT key to

confirm the settings.

9. Press the ESC key to close the menu.

Before Starting Observation and Measurement of Waveforms

Explanation

Setting the Date/Time ON or OFF

When you set the mode to ON, the date and time will appear in the upper right corner of the screen. And when making a hard copy of the screen (to the built-in printer or external plotter) the date and time will be printed together with the waveform.

The current date and time are saved together with the waveform data or set-up data when the data is saved to a floppy disk.

Setting values of Date/Time DATE TIME

Year : 1980 to 2079 Hour : 00 to 23 Month : 1 to 12 Minute : 00 to 59 Day : 1 to 31 Second : 00 to 59

Note

The date and time are backed up by the built-in lithium battery. Leap years are provided.

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4.1 Starting and Stopping Acquisition

Keys and Procedure

1. Press the START/STOP key to start/stop waveform acquisitioning.

2. In case the indicator located at the upper left of the START/STOP key is lit, waveform acquisition is in progress.

3. In case the indicator located at the upper left of the START/STOP key is not lit, waveform acquisition is not in progress. In the upper

left corner of the screen, “Stopped” appears.

START/STOP key

Explanation

Operation when averaging mode is selected as the acquisition mode

Averaging stops when acquisition is stopped, and resumes when acquisition is restarted.

Operation during display of accumulated waveforms

Accumulated display stops temporarily when acquisition is stopped. When measurement is restarted, the accumulated display is reset and accumulation starts.

Common Operations

The START/STOP key is not operative in the following cases

• When remote state is active (i.e. the REMOTE indicator is lit);

• When a short or long copy is being output to the built-in printer;

• When the floppy disk is being accessed (e.g. when data is being saved to it). (If acquisition is in progress, access to the floppy disk starts after acquisition is stopped.);

• When calibration, auto set-up or initialization is in progress.

Operation in combination with external clock

When the external clock is being used and you start acquisition, the error messages “Ext clock too slow” or “Ext clock too fast” might appear.

Note

If the START/STOP key is pressed to start acquisition while acquisition data (ACQ data) loaded from a floppy are being displayed, the acquisition data will disappear from the screen. It is possible to retain the waveform on screen by stopping acquisition only for the channel corresponding to the trace No. of the waveform. For a description of this operation, refer to page 12-6. For details regarding the external clock settings, refer to page 5-8.

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4.2 Displaying Waveforms using the Auto Set-up Function

Keys and Procedure

1. Press the AUTO-SETUP key to display the auto set-up execution

AUTO-SETUP key

Soft keys

Explanation

Waveforms for which auto set-up is effective

Frequency : Approx. 40 Hz to 150 MHz Amplitude : Approx. 50 mV or higher (when probe attenuation is 1:1) Type : Repetitive (but not complex) waveform

Auto set-up settings related to the vertical axis CH1 to 4 (CH1/CH2 for DL1520/DL1520L)

V/DIV when one waveform is displayed : Set to a value so that the peak voltage

POSITION Set as follows depending on the number of channels which are ON.

menu.

Executing auto set-up

2. Press the “AUTOSET EXEC” soft key to perform auto set-up.

Channels will be turned ON/OFF automatically depending on whether input is applied or not.

Canceling auto set-up

3. Press the “UNDO” soft key to restore the previous settings which

were in effect before the auto set-up. Note however that, if you have performed any other settings, it might be necessary to press the AUTO-SETUP key once again.

Depending on whether input is applied or not, the channels are automatically turned ON or OFF. (In case of an amplitude of at least approx. 50 mV (and probe attenuation is 1:1), the channel will be turned ON).

is between 1.6 div p-p and 4 div p-p.

when two waveforms are displayed : Set to a value so that the peak voltage

is between 0.8 div p-p and 2 div p-p.

when three waveforms are displayed : Set to a value so that the peak voltage

is between 0.4 div p-p and 1 div p-p.

when four waveforms are displayed : Set to a value so that the peak voltage

is between 0.4 div p-p and 1 div p-p.

4-2

Single channel Two channels Three channels Four channels

INPUT • Input coupling: DC; Offset: 0V

• Inversion: Unchanged

• Probe attenuation : Unchanged Probe attenuation must be set before starting auto set-up.

• Acquisition hold : Unchanged

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4.2 Displaying Waveforms using the Auto Set-up Function

Auto set-up settings related to the horizontal axis TIME/DIV Set to a value so that between two and four periods of the slowest input

signal can be observed. If this is not possible for any of the channel input signals, set to 1ms/ div.

TIMEBASE Set to “INT”.

Auto set-up settings related to triggers MODE Set to “AUTO”. TYPE Set to “EDGE”. LEVEL/SOURCE The trigger level is set to half the amplitude of the trigger source, and

the channel for the slowest signal is selected as the trigger source. The slope setting is set to “

COUPLING Set to “DC”, HF rejection remains unchanged. POSITION Set to 0div. DELAY Set to “0s”. HOLD OFF Set to “OFF”.

Auto set-up settings related to acquisition/display conditions START/STOP Acquisition is started. ACQUISITION Set to “NORMAL”. LENGTH (for DL1540L)

Unchanged.

FILTER Smoothing is set to “OFF”, Band to “FULL”. ZOOM Mode is set to “OFF”, and other settings remain unchanged. DISPLAY Settings related to interpolation, the X-Y display, and accumulate

display remain unchanged.

DISPLAY FORM Settings related to graticule, scale, %marker and Waveform

information remain unchanged.

”.

Common Operations

Auto set-up settings related to waveform analysis MEASURE Settings related to automated measurements remain unchanged. CURSOR Settings related to cursor measurements remain unchanged. MATH Waveform computation and phase shift are set to “OFF”.

Other Auto set-up related settings STORE/RECALL Display of recalled waveforms is set to “OFF”. SAVE/LOAD Display of loaded waveforms is set to “OFF”.

UNDO : Cancellation of auto set-up

After auto set-up has been completed, this function allows you to restore the settings which were in effect before the auto set-up was performed. However, if the power is turned OFF, the settings which were in effect before the auto setup will be lost. Thus, it is not possible to perform an UNDO before an auto set-up.

Note

• It is not possible to perform auto set-up while GO/NO-GO determination is in progress.

• The snapshot waveform will be deleted if auto set-up is performed.

• The auto set-up function may not operate correctly in certain cases such as when the waveform contains DC components or high frequency components.

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4.3 Initializing Settings

Keys and Procedure

1. Press the INITIALIZE key to display the initialization execution

INITIALIZE key

Soft keys

Explanation

Default settings related to the vertical and horizontal axes CH1 to CH4 All channels ON (CH1/CH2 for DL1520/DL1520L) V/DIV 50 V/div POSITION The horizontal position is set to 0div. For the vertical position, refer to

INPUT Input coupling: DC, Probe attenuation: 10:1, Inversion: OFF TIME/DIV 1 ms/div TIMEBASE INT

menu.

2. Press the “INITIAL EXEC” soft key to execute initialization.

the figures (Two channels, Four channels) given under title “POSITION” in section 4.2.

Default settings related to trigger MODE AUTO FUNCTION EDGE LEVEL/SOURCE Trigger source: CH1, Trigger slope: “ COUPLING Trigger coupling: AC, HF rejection: OFF POSITION Center of the waveform display frame DELAY Delay time: 0 s HOLD OFF Mode: OFF, Hold-off time: MIN (0.2µs)

Default settings related to other settings ACQUISITION Mode: NORMAL LENGTH (for DL1520L/DL1540L)

Record length: 10K

FILTER Smoothing: OFF, Band limit: FULL DISPLAY Interpolation: SINE, X-Y display: OFF, Accumulate: OFF DISPLAY FORM Graticule: GRID, Scale: ON, % Marker: OFF, Waveform information:

ON, Intensity: TEXT (9)

SHIFT OFF (LED is not lit)

Settings which cannot be initialized

In the following cases, the settings which were in effect before initialization will be retained even if initialization is performed.

• Date and time • Displayed waveforms/setting parameters

• GO/NO-GO zone waveforms stored in the internal memory

• Communications addresses

”,Trigger level: 0 V

4-4

Points to note when initializing

• Snapshot waveforms will be deleted when initialization is performed.

• Operations such as measurements, computations, etc. will be halted.

• Initialization cannot be performed during GO/NO-GO.

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4.4 Halting a Waveform and Erasing the Halted Waveform (Snap Shot and Clear Trace)

Keys and Procedure

1. Press the SNAP SHOT key to halt the waveform.

SNAP SHOT key

CLEAR TRACE key

Explanation

Snap Shot Function

A snapshot waveform is displayed each time the SNAP SHOT key is pressed and will be deleted when you switch between MAIN/ZOOM or MainZoom display, or when initialization of settings is performed. A snapshot cannot be performed during X-Y waveform display. In order to view snapshot waveforms only, you can either turn off the input signal (by pressing the CH key), or move the vertical position of the displayed channel. Snapshot waveforms will remain on the screen even if calibration is performed. The following operations are not possible on snapshot waveforms.

• Position movement

• Cursor measurement

• Automated measurement

• Expansion

•Waveform computation

• Storage in the internal memory

• Outputting to an external plotter

• Saving on a floppy disk in case of the HP-GL and PS format

2. Press the CLEAR TRACE key to erase the halting waveform.

Common Operations

Functions of the CLEAR TRACE key

Deletes the following waveforms.

• Snapshot waveform

• Accumulated waveform (refer to page 7-12) Restarts the following operations.

•Averaging (refer to page 7-1)

• Equivalent time sampling

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4.5 Performing Calibration

Keys and Procedure

1. Press the CAL key to display the calibration execution menu. Executing manual calibration

2. Press the “EXEC” soft key to execute calibration.

Soft keys

CAL key

Explanation

About the calibration function

The following parameters are calibrated.

• Ground level offset

• A/D converter gain

•Trigger threshold level

•Time axis for equivalent time sampling Calibration takes approximately five seconds. No keys are operative during calibration.

Turning automatic calibration ON

3. Press the “Auto CAL” soft key to select “ON”.

Automatic calibration function

When the automatic calibration function is ON, calibration is performed automatically after the following time periods has elapsed in case T/div has been changed. After the power is turned ON 3 minutes; 10 minutes; 30 minutes, then every half hour.

4-6

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4.6 Setting Values

Keys and Procedure

Rotary knob SELECT key

ESC key

corresponding

(available with

DL1540/DL1540L)

MISC(KEYBOARD) key

Keys

to keyboard

SHIFT key

<, > key

Entry using the keyboard

1. Press the SHIFT + MISC(KEYBOARD) key to display the

keyboard.

Setting by rotary knob and SELECT key

2. Use the rotary knob to select the desired value and press the SELECT key. This allows setting one by one.

3. Select the “SET” key and press the SELECT key. The keyboard

screen will be closed.

Setting by corresponding panel keys (available on DL1540/ DL1540L)

2. After having performed step 1, press the corresponding panel keys

directly.

3. After having entered the new value, select the “SET” key and press the SELECT key. The keyboard screen will be closed.

Common Operations

Explanation

Entry by rotary knob

1. Change the value (displayed in the lower right side of the screen) by

turning the rotary knob.

2. When the new value has been selected using the rotary knob, use the <, > keys to move to the next position to be changed.

Ex.

Entry using the keyboard

The operation described in step 1 will only result in displaying the corresponding keyboard when the setting allows numerical input. Depending on the setting, there are cases when units such as k, m, u (symbolizing µ), EXP and NAN (Ignore) appear. To change such a setting, select the correct one using the rotary knob, and press the SELECT key. Pressing the RESET key will clear the keyboard display. Decimal enterings will be rounded as necessary to comply with the step size.

Entry using the rotary knob

Pressing the RESET key will reset the value displayed in the rotary knob menu to the default value (factory setting).

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4.7 Entering Characters using the Keyboard

Keys and Procedure

Rotary knob

SELECT key

ESC key

<, > key

Explanation

Displaying the keyboard to enter characters/symbols

For entry of a file name, refer to

6.9 Setting the Action-On Trigger (page 6-14)

9.1 Judging using a Waveform Zone (page 9-1)

9.2 Judging using Measured Values of Waveform Parameters (page 9-5)

12.3 Saving and Loading Waveform Data (page 12-4)

13.3 Saving and Loading Waveform Data (page 13-4)

For entry of a comment, refer to

10.6 Entering a Comment (page 10-10)

1. Display the keyboard used for entering a file name or comment (displayed when your are prompted a character input).

2. Use the rotary knob to select the desired character or symbol and press the SELECT key. The entered character will appear on the displayed keyboard.

3. Repeat step 2 until all characters and symbols are entered.

4. Move the rotary knob to the “ENT” setting and press the SELECT key. The file name, comment and such will be set and the keyboard

screen will be closed.

Function keys on the soft keyboard

DEL ........ Deletes the character or symbol left of the cursor in the character string.

INS .......... Switches between insert and overwrite modes.

CAPS ..... Switches between upper and lower case letters.

CLR ........ Deletes all entered characters and symbols. Has thus the same function as the

RESET key on the front panel.

SPACE ... Enters one space.

ENT ........ Confirms the entered characters and symbols.

* Pressing the < or > key shifts the entry position (cursor) to the left or right. ESC key Aborts entering file name or comments during setting. The keyboard screen will

be closed and setting will be ignored.

Points to note

• The following number of characters can be entered. File name : 1 to 8 Comment : 0 to 25

• The following character types are available. File name : Digits, letters (not case sensitive), _(underline), – (minus), %, (, ) Comment : All characters and symbols on the keyboard (case sensitive), and space

• The following five file names are not available due to MS-DOS restrictions. AUX, CON, PRN, NUL, CLOCK

4-8

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5.1 Turning Display of Input Signal Waveforms ON/ OFF

Keys and Procedure

CH key



Explanation

Maximum display record length and limits on waveform acquisition (when 1 MW for 1520L or 2 MW for DL1540L is selected)

The channels which acquire/display the waveform are limited to channel 1 on DL1520L and channel 1 and 2 on DL1540L. Channel 2 on DL1520L and channel 3 and 4 on DL1540L do not acquire/display the waveform. When the time axis setting is set to 50 ns to 5 ns range; when the trigger mode is not single mode; or when one of the two, channel 2 or trace math in the case of DL1520L and one of the two, channel 3 or 4 in the case of DL1540L is ON, maximum display record length of 1 MW for DL1520L and 2 MW for DL1540L can not be selected. For information about selection of maximum displayable record length, refer to Section 7.1 (page 7-1).

CH key operation during waveform math

The math waveform will be displayed at trace 3 (for DL1540/DL1540L, location where the input signal of channel 3 is usually displayed). For DL1540/DL1540L, even if you press the CH3 key, and the indicator is lit, the math waveform will be displayed. For DL1520/ DL1520L, the math waveform will be displayed at trace MATH. The math waveform consists of data of channel 1 and channel 2. Even when you turn off the display of channel 1 or 2, the math waveform will remain. For DL1540/DL1540L, to display the input signal waveform of channel 3, you have to turn OFF waveform math. Refer to page 8-16.

CH key operation during display of a recalled waveform

When you recall waveform data from the internal memory, that waveform will appear on the screen. To turn the display of the recalled waveform off, press the CH key corresponding to the number of the recalled waveform (displayed as “MEM”), and select OFF at the appeared menu. Refer to page 11-2, step 13 and 14.

CH key operation during display of a loaded waveform

When you load P-P waveform data or acquisition waveform data from a floppy disk, that waveform will appear on the screen. To turn the display of the P-P waveform off, press the CH key corresponding to the number of the P-P waveform (displayed as “MEM”), and select OFF at the appeared menu. Refer to page 12-5, step 19 and 20. To turn the display of the acquisition waveform off, press the CH key corresponding to the number of the acquisition waveform.

CH key operation during display of a GO/NO-GO zone waveform

Pressing a CH key turns display of both the corresponding input signal waveform and the zone waveform ON/OFF.

Note

• If the START/STOP key is pressed to start acquisition while loaded waveforms are displayed, the displayed waveforms will be cleared from the screen. It is possible to retain a desired waveform on screen by stopping acquisition of the corresponding channel. For a description of this operation, refer to page 12-6.

• For DL1520L/DL1540L, if you have saved ACQ data to multiple floppy disks, you can opt to load all of this data or only part of it (for example, data from one disk only). If you do a partial load, the waveform display will not appear over the entire time axis, but only over a portion of it. Refer to the procedures for saving and loading of ACQ waveform data, beginning on page 12-5.

• Pressing the SNAP SHOT key also keeps the waveform on the screen. To clear the snapshot waveform, press the CLEAR TRACE key.

• In the following cases erroneous waveforms might appear on channel 3 or 4 (channel 2 for DL1520). Acquiring the waveform once again will result in a correct display.

• For DL1540, when the record length is 120KW, the trigger mode is SGL (L) and waveform

acquisitioning has ended and you turn CH3 or CH4 ON, while they had been OFF until then.

• After acquiring waveforms at 200 MS/s and you stop acquisition, and then you switch CH3 or CH4

(CH2 for DL1520/DL1520L) ON.

1. The waveform will appear on the display after you have pressed the CH key. The indicator above the CH key will light up.

2. If you want to display all waveforms, press all the CH keys, and

verify that all the indicators light up.

3. In order to turn the display of a waveform off, press the corresponding CH key once more.

Setting the Vertical and Horizontal Axes

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5.2 Setting the Input Coupling

Keys and Procedure

Rotary knob

Soft keys

INPUT key

Explanation

Input coupling

The following three types of input coupling are available. The default is “DC”.

AC Displays only the AC content of the input signal. DC Displays both the DC and AC content of the input signal. Only in this case an offset

value can be set. This setting can also be done pressing the KEYBOARD key (refer to page 4-7).

GND Used to check the ground level.

1. Press the INPUT key corresponding to the channel for which input

coupling is to be selected. The input setting menu will be displayed.

2. Press the soft key corresponding to the desired coupling type.

3. When DC is selected, turn the rotary knob to set the desired offset

voltage.

Input coupling and frequency characteristic

The frequency characteristic when “AC” or “DC” is selected is shown below. Note that low-frequency signals and low-frequency contents are not acquired if “AC” is selected.

When "AC" is selected When "DC" is selected

Attenuation

0 dB

– 3 dB

less than 10 Hz when using 1:1 probe less than 1 Hz when using 10:1 probe

Input frequency

150 MHz

Attenuation

0 dB

– 3 dB

Input frequency

Offset voltage and vertical sensitivity

If “DC” is selected, it is possible to cancel the offset voltage for the input signal. The allowable setting range varies depending on the vertical sensitivity as shown in the table below.

Vertical sensitivity* Allowable setting range* Setting step

10 mV to 500 mV/div –10 V to ±10 V 500 µV

(for DL1520/DL1520L, 20 mV to 500 mV/div)

1 V to 5 V/div –100 V to ±100 V 5 mV 10 V to 50 V/div –1000 V to ±1000 V 50 mV

* The above values are given for a probe attenuation of 10:1. They will be 1/10 the value shown

when the attenuation is 1:1, 10 times the value shown when it is 100:1, and 100 times the value shown when it is 1000:1.

150 MHz

5-2

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5.2 Setting the Input Coupling

Offset voltage and displayed value (measured value)

The offset function eliminates unnecessary DC voltage from an input signal voltage. If the offset voltage is set to a positive value, the input signal is displayed with the offset voltage subtracted from it, as shown below. The offset voltage is also subtracted from the measured voltages obtained during automated measurements.

offset : aV

Decreases by "a" V.

CAUTION

Points to note when setting the offset voltage

• Once the offset voltage has been set, it will not change unless initialization is performed. For instance, if the input coupling is set to “AC” after the offset voltage has been set, the offset voltage will remain unchanged even if the input coupling is later switched to “DC”.

• When the probe attenuation is changed, the offset voltage also changes accordingly.

• The offset voltage remains unchanged irrespective of the vertical sensitivity. However, if the offset voltage exceeds the allowable setting range, it will be set to the maximum or minimum vertical sensitivity value.

• When the offset voltage is set, it will also be subtracted from the acquired waveform data in acquisition memory. Thus, care must be taken when saving acquisition data.

When using AC coupling with a 10 MΩ, 10:1 probe, keep in mind that the voltage at the input connector will not be attenuated to 1/10 at the probe tip for input signal components below 1 Hz. Be careful not to let the input voltage at the probe tip exceed 250 V (DC+ACpeak) or 177 Vrms for signal components below 1 Hz.

Setting the Vertical and Horizontal Axes

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5.3 Setting the Probe Attenuation

Keys and Procedure

1. Press the INPUT key corresponding to the channel for which the probe attenuation is to be selected. The input setting menu will be displayed.

Soft keys

INPUT key

Explanation

Probe attenuation

Probe attenuation can be selected from “1:1”, “10:1”, “100:1” and “1000:1”. The default is “10:1”. Set to “10:1” when using the probe supplied with the instrument. Set to “1:1” when using a BNC cable.

2. Press the “Probe” soft key to display the probe selection menu.

3. Press the soft key corresponding to the desired attenuation.

Note

The selected probe attenuation will remain unchanged even if auto set-up is performed. When the probe attenuation is changed, the offset voltage also changes accordingly.

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5.4 Inverting a Waveform

Keys and Procedure

1. Press the INPUT key corresponding to the channel whose waveform

is to be inverted. The input setting menu will be displayed.

2. Press the “Invert” soft key to select “ON”.

Soft keys

INPUT key

Explanation

Setting the Vertical and Horizontal Axes

Relevant channels

The input signals for channels CH1 to CH4 (for DL1520/DL1520L, CH1/CH2) can be inverted independently of one another. Each time the soft key is pressed, “ON” or “OFF” are displayed alternately, and the waveform will be inverted accordingly.

Indication of an inverted signal

When a waveform is inverted, the corresponding trace number is highlighted as shown below.

Points to note

• Cursor measurement, automated measurement, waveform math and GO/NO-GO determination are performed on the inverted waveforms, not on the original ones.

• The waveform data that will be saved in the acquisition memory will not be inverted, so care must be taken when saving the acquisition data.

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5.5 Setting the Vertical Sensitivity

Keys and Procedure

Rotary knob

soft keys

V/DIV key

Explanation

Setting the range and probe attenuation

The V/div setting range varies depending on the attenuation of the probe used, as shown below.

Probe attenuation Setting range*

1:1 1 mV to 5 V/div (for DL1520/DL1520L, 2 mV to 5 V/div) 10:1 10 mV to 50 V/div (for DL1520/DL1520L, 20 mV to 50 V/div) 100:1 100 mV to 500 V/div (for DL1520/DL1520L, 200 mV to 500 V/div) 1000:1 1 V to 5000 V/div (for DL1520/DL1520L, 2 V to 5000 V/div)

* V/div can be set in multiples of 1, 2 and 5, e.g. 1 V/div → 2 V/div → 5 V/div.

1. Press the V/DIV key of the desired channel to display the vertical sensitivity setting menu. Verify that the “CAL” setting is highlighted.

2. Turn the rotary knob to set the desired sensitivity (V/div).

3. In case you want to adjust the setting in smaller steps, press the “Variable” soft key.

4. Turn the rotary knob to set the desired sensitivity.

Variable mode

When “Variable” is highlighted, V/div can be set in fine steps as shown below.

CAL Setting value Variable Setting range* Setting step*

10 mV 5.0 mV to 20.0 mV 0.1 mV

(Available on DL1540/DL1540L)

20 mV 10.0 mV to 50.0 mV 0.1 mV 50 mV 20.0 mV to 100.0 mV 0.1 mV 100 mV 50 mV to 200 mV 1 mV 200 mV 100 mV to 500 mV 1 mV 500 mV 200 mV to 1000 mV 1 mV 1 V 0.5 V to 2.00 V 0.01 V 2 V 1.00 V to 5.00 V 0.01 V 5 V 2.00 V to 10.00 V 0.01 V 10 V 5.0 V to 20.0 V 0.1 V 20 V 10.0 V to 50.0 V 0.1 V 50 V 20.0 V to 100.0 V 0.1 V

* The above values are given for a probe attenuation of 10:1. They will be 1/10 of the value shown

when the attenuation is 1:1, 10 times the value shown when it is 100:1, and 100 times the value shown when it is 1000:1.

Note

If the RESET key is pressed to reset V/div setting, V/div will be set to the maximum possible level. For a description of how to set the probe attenuation, refer to page 5-4.

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5.6 Changing the Waveform’s Vertical Position

Keys and Procedure

Rotary knob

Soft keys

1. Press the POSITION key of the channel whose waveform you want

to move.

2. Select the position of the screen where you want the waveform to be

displayed by pressing the corresponding soft key.

3. Turn the rotary knob to fine adjust the position.

Explanation

POSITION key

Setting the Vertical and Horizontal Axes

Moving range

The ground level can be moved up to ±4.000 div from the center of the waveform display frame. This range can be travelled using the rotary knob. The soft keys allow you to move the waveform quickly to either of the positions “–3div/–1div/0div/+1div/+3div”.

Setting resolution

The ground level can be moved in steps of 0.02 divisions irrespective of the vertical sensitivity.

Waveforms which cannot be moved

Snapshot waveforms

Indication of the vertical position

For an input signal waveform or computed waveform, the corresponding trace No. and ground level mark are displayed on the left edge of the waveform display frame. The trace No. and ground level mark also move with the waveform when the waveform is moved. For a recalled or loaded waveform, the trace No. (preceded by “L”) also moves with the waveform when the waveform is moved.

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Ground level mark

Trace No.

Note

Waveforms can still be moved vertically if acquisition is in progress. However, if some parts of the waveform exceed 10.24 divisions before acquisition is stopped, those parts will remain at the end of the display frame even if the waveform is moved. If a waveform is moved vertically out of the waveform display frame, measured values obtained during automated measurement or cursor measurement may not be accurate.

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5.7 Selecting the Timebase

Keys and Procedure

Rotary knob

Soft keys

MISC key

Explanation

Selectable Timebases

Timebase can be selected from the following three types.

INT Internal clock signal EXT IN Clock signal input to the EXT TRIG IN/EXT CLOCK IN terminal EXT CH4 Clock signal input to the CH4 input terminal

(Available on DL1540/DL1540L)

1. Press the MISC key to display the MISC menu.

2. Press the “Time Base...” soft key to display the timebase setting

menu.

3. Select the required timebase by pressing the corresponding soft key. “EXT CH4” menu is available on DL1540/DL1540L.

4. In case you selected “EXT IN” or “EXT CH4”, use the rotary knob to set the required threshold level. “EXT CH4” menu is available on DL1540/DL1540L.

When “EXT IN” is selected

Input a clock signal to the EXT TRIG IN/EXT CLOCK IN terminal on the rear panel (for DL1520/DL1520L, EXT TRIG terminal on the front panel). The clock signal must conform to the specifications given below.

• For DL1520/DL1520L

Item Specifications

Connector type BNC Maximum input voltage 250 V(DC+ACpeak) or 177 Vrms, when the

Input band DC to 100 MHz Fequency range of external 40 Hz to 80 MHz clock Input range 2 ranges (±10 V and ±1 V) Input level range ±10 V range: –10 V to + 10 V in steps of 40 mV

(Probe attenuation ratio 1:1) ±1 V range: –1 V to + 1 V in steps of 4 mV Input sensitivity 2 Vp-p (±10V range)

(Probe attenuation ratio 1:1) 200 mVp-p (±1V range) Input coupling AC/DC HF rejection Bandwidth limit (approx. DC to 15 kHz)

Input impedance Approx. 1 MΩ (same as section 16.1)

frequency is 1 kHz or below, (CAT I and II)

for the input signal can be turned ON/OFF.

• For DL1540/DL1540L

Item Specifications

Connector type BNC Maximum input voltage ±6 V Frequency range 40 Hz to 15 MHz Input level TTL/CMOS level recommended

0.3 Vp-p or greater when measured at the end of the connector ±0.15 V or greater relative to the

threshold level Input impedance Approx. 1 MΩ Threshold level 1.5 V or 0.15 V Minimum pulse width 25 ns or more for both

High and Low levels

Input terminal Example (DL1540/DL1540L)

EXT CLOCK IN

EXT TRIG IN

±6V MAX 1MΩ

5-8

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5.7 Selecting the Timebase

CAUTION

If a clock signal exceeding the maximum input voltage is input to the each terminal, damage to the internal circuits of the instrument may result.

When “EXT CH4” is selected (available on DL1540/DL1540L)

Input a clock signal to the CH4 input terminal on the front panel. The clock signal must conform to the specifications given below.

Item Specifications

Frequency range 40 Hz to 80 MHz Input level 2 div p-p or higher Input impedance 1 MΩ Minimum pulse width 5 ns or more for both High and Low levels

Threshold level setting range for detection of edge : Voltage equivalent to ±5 div

Points to note when sampling using an external clock

• The clock signal must be continuous. No burst signal is allowed.

• If the frequency of the clock signal is out of specification, a warning message “External Clock too slow” or “External Clock too fast” will be displayed at the top of the screen. When the internal clock is switched to the external clock, no waveforms will be displayed until the clock conforms to the specifications.

• Only real-time sampling mode is available.

• Envelope mode cannot be set.

• Display of waveforms is not possible in roll mode.

• No function to divide the clock signal is available.

• Since the time axis setting cannot be changed, expand the time axis if you want to change the display range. For a description of expanding waveforms, refer to page 7-4.

•Trigger delay setting is invalidated.

• The time measured by the cursor measurement or automated measurement function is expressed in the number of pulses of the clock signal. No unit is displayed.

Setting the Vertical and Horizontal Axes

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5.8 Setting the Time Axis

Keys and Procedure

Turn the time axis setting knob to adjust the time axis setting. The time axis setting value, displayed in the lower right corner of the screen, will change accordingly.

Time axis setting knob

Explanation

Time axis setting range

T/div can be set within the range of 5 ns/div to 50 s/div (in multiples of 1, 2 and 5)

The relationship between sampling mode and display mode

Sampling mode and display mode change as follows according to the T/div setting. For a detailed description of sampling mode and display mode, refer to page 1-5 and 1-6.

• If maximum displayable record length is set to 1 K (DL1520L/DL1540L)

Time-axis setting Sampling mode Display mode *1

50 s to 50 ms/div Real-time Roll mode 20 ms to 1 µ s/div Real-time Update mode 500 ns to 100 ns/div Real-time/repetitive *2 Update mode 50 ns to 5 ns/div Repetitive Update mode

• If maximum displayable record length is set to 10 K or 100 K (DL1520L/DL1540L), or when DL1520/DL1540 is used

Time-axis setting Sampling mode Display mode *1

50 s to 50 ms/div Real-time Roll mode 20 ms to 10 µ s/div Real-time Update mode

5 µ s to 100 ns/div Real-time/repetitive *2 Update mode 50 ns to 5 ns/div Repetitive Update mode

• If maximum displayable record length is set to 400 K (available only if trigger mode is “single”) (DL1520L/DL1540L)

Time-axis setting Sampling mode Display mode *1

50 s to 200 ms/div Real-time Roll mode 100 ms to 100 ns/div Real-time Update mode

• If maximum displayable record length is set to 1 M (available only if trigger mode is “single” and the only displayed channel is CH1 for DL1520L.) (DL1520L/DL1540L)

Time-axis setting Sampling mode Display mode *1

50 s to 500 ms/div Real-time Roll mode 200 ms to 100 ns/div Real-time Update mode

5-10

• If maximum displayable record length is set to 2 M (available if trigger mode is “single” and display channel is 1 or 2) (DL1540L)

Time-axis setting Sampling mode Display mode *1

50 s to 1 s/div Real-time Roll mode 500 ms to 100 ns/div Real-time Update mode

*1 Indicates the display mode which is in effect when the trigger mode is auto mode or auto level

mode and hysterisis is set off. For a description of how to set the trigger mode, refer to 6.8 “Setting the Trigger Mode” (page 6-12).

*2 Either real-time or repetitive mode is possible. For a description of how to switch modes, refer

to 7.1 “Selecting Acquisition Mode, Sampling Mode and Record Length” (page 7-1).

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5.8 Setting the Time Axis

Relationship between sampling rate and record length

Reducing the time-per-division setting (“T/div” time axis setting) increases the sampling rate. If T/div is set below some specific level, the displayed record length will be shorter than the maximum displayable record length. For details, refer to Appendix 2/Appendix 3.

Changing T/div while acquisition is in progress

T/div can still be changed when acquisition has been stopped with the START/STOP key. The newly set T/div will come into effect when acquisition is restarted. When T/div is changed while acquisition is in progress, the new T/div value will be displayed below the T/ div for the displayed waveform, as shown below.

T/div for the currently displayed waveform T/div just after acquisition has started

Points to note

• T/div can be changed irrespective of the displayed menu, since a T/div setting knob is available. But, for DL1520L/DL1540L, note that it is not possible to select a short time axis (50ns/div or less) if maximum displayable record length has been set to 400 KW, 1 MW, or 2 MW (for DL1540L only). (See page 7-1.)

• The T/div setting has no effect if the external clock signal is selected as the timebase.

• During expansion mode, the T/div obtained by dividing the normal display T/div by the expansion ratio is displayed.

• If T/div is set so that roll mode is activated, averaging will not be performed on the waveform data, even if the acquisition mode has been set to averaging mode (“NORM” will be displayed instead of “AVG”).

• Even if the trigger mode is single mode, if T/div is set to a value within a certain range, roll mode will still be activated. However, when a trigger is activated and acquisition of data of the specified record length ends, waveform display will be stopped.

• Pressing the CLEAR TRACE key while waveforms are displayed in repetitive sampling mode will restart sampling.

Setting the Vertical and Horizontal Axes

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5.9 Changing the Waveform’s Horizontal Position

Keys and Procedure

Rotary knob

Soft keys

POSITION key

Explanation

Moving range

The viewing frame can be moved up to ±5.00 div from the center of the waveform display frame. This range can be travelled using the rotary knob. The soft keys allow you to move the viewing frame quickly to either of the positions “–4div/0div/+4div”.

Setting resolution

The frame can be moved in steps of 0.02 divisions irrespective of the horizontal sensitivity.

1. Press the POSITION key to display the menu for horizontal positioning.

2. Select the position to where you want to move the viewing frame by pressing the corresponding soft key.

3. Turn the rotary knob to fine adjust the position.

Waveforms which cannot be moved

The viewing frame cannot be moved when snapshot waveforms are displayed.

Indication of the horizontal position

The trigger position marker will show the new position. In roll mode, a bargraph will appear in the upper side of the screen and will show which part of the waveform is shown on the screen.

Other modes than roll mode

Horizontal position is 0 div

Horizontal position is moved to +4 div

Horizontal position is moved to –4 div

Points to note

• The horizontal position cannot be changed while acquisition is in progress in the roll mode. In order to move the horizontal position, first stop the acquisition.

• In all modes except the roll mode, changing the horizontal position might result in cases where the displayed range exceeds the record length of the acquisition memory. No waveform will be shown at that part of the displayed range.

• Even when the horizontal position has been changed, the zoom box will not change its position on the display. Refer to page 7-4.

Roll mode

When the display is in roll mode and data acquisition has  been started, the horizontal position will automatically be moved to +5 div.

Horizontal position is +5 div

Horizontal position is moved to 0 div

Horizontal position is moved to –4 div

+5 div

displayed range

0 div

displayed range

–4 div

displayed range

5-12

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6.1 Relationship between Trigger Type and Trigger Source/Slope/Level

Settings which can be made with the LEVEL/SOURCE soft key or rotary knob menu vary as shown below according to the selected trigger type. The setting procedure for each trigger type is described on the page indicated below. (The menu provided with DL1540/DL1540L is used. For DL1520/DL1520L, CH3/CH4, OR, PATTERN and WIDTH menus are not provided. For DL1520/DL1520L, TV trigger menu differs from the one given below.)

TYPE

Selects the trigger type

page 6-2

page 6-4

page 6-5

Selection of broadcasting type

page 6-7

Selection of field No./Line No.

LEVEL/ SOURCE

Selects trigger condition

Polarity selection

Selection of trigger source/slope/state

Sets the trigger source/slope (state)/level

Selection of trigger source/slope

Trigger level

Center level

Width

Trigger level

Activating a Trigger

page 6-8

page 6-10

Selection of trigger conditions

Trigger level

When activating a trigger by state pattern only

Selection of trigger source/state

Selection of trigger condition

When activating a trigger in synchronization with the clock signal

Selection of the trigger slope of

the clock channel

Selection of trigger source/state

Selection of trigger condition

Selection of trigger source/state

Trigger level of clock channel

Select "X"

Trigger level

Selection of clock channel

Trigger level

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Pulse width

Trigger level

6-1

Page 50

6.2 Setting the Edge Trigger

Keys and Procedure

Rotary knob

Soft keys

TYPE key

LEVEL/SOURCE key

1. Press the TYPE key to display the trigger type selection menu.

2. Press the “EDGE” soft key.

(For DL1520/DL1520L, “OR”, “PATTERN” and “WIDTH” menus are not displayed. They are optional with DL1540/DL1540L.)

Selecting the trigger source and slope and setting the trigger level

3. Press the LEVEL/SOURCE key to display the trigger source

selection menu.

4. Press the soft key corresponding to the desired trigger source. The trigger slope selection menu appears. When “LINE” is selected, this menu will not be displayed and thus steps 5 to 11 are not necessary.

5. Keep pressing the soft key corresponding to the selected trigger source until the desired slope is selected.

6. Turn the rotary knob to set the desired trigger level.

Explanation

When “EXT” is selected as the trigger source for DL1520/DL1520L

7. Press the “Range” soft key to display the external trigger range

setting menu.

8. Press the soft key corresponding to the desired range.

9. Press the “Probe” soft key to display the probe selection menu.

10. Press the soft key corresponding to the desired attenuation ratio.

11. Turn the rotary knob to select the desired trigger level for the external

trigger.

Types of Trigger sources and setting the trigger slope/level CH1/CH2/CH3/CH4

Select one of these to select one of the input signals CH1 to CH4 as the trigger source. The trigger slope can be selected from the following three slope types.

Activates a trigger when the trigger source changes from a level below the trigger level to one above the trigger level. Activates a trigger when the trigger source changes from the level above the trigger level to the one below the trigger level.

Activates a trigger in either of the above cases. The setting range for the trigger level is within ±10 div of the vertical sensitivity, but is however limited by the waveform display frame. For example, when the voltage sensitivity is set to 50 mV/div, the trigger level to +300 mV and the ground level of the trigger source is positioned at 0div, the trigger level becomes +250 mV. In case the ground level of the trigger source is positioned at –3 div, the trigger level becomes +300 mV. The setting step for the trigger level is 1/50 of the vertical sensitivity.

6-2

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6.2 Setting the Edge Trigger

EXT (external Trigger)

Select this when connecting the trigger signal source to the “EXT TRIG IN/EXT CLOCK IN” terminal on the rear panel (also used as the terminal for an external clock) and selecting the signal as the trigger source. For DL1520/DL1520L, connect the trigger signal source to the “EXT TRIG” terminal on the front panel. For the specifications of the terminal, refer to “When “EXT IN” is selected” in section 5.7

CAUTION

If a clock signal exceeding the above permissible maximum input voltage is input to the each terminal, damage to the internal circuits of the instrument may result.

The trigger slope must be selected from “ of the channels CH1 to CH4 (for DL1520/DL1520L, CH1/CH2) is selected. For DL1540/ DL1540L, the trigger level must be either “0.15 V” or “1.5 V”.

• Setting the EXT range (for DL1520/DL1520L) Select either ±1 V or ±10 V range. The default is ±10 V range.

• Setting the attenuation for EXT probe (for DL1520/DL1520L) Select 1:1, 10:1, 100:1 or 1000:1. The default is 10:1.

• Setting the EXT trigger level (for DL1520/DL1520L) The EXT trigger level can be set within the following range. This range is effective if the probe’s attenuation is set to 1:1. If the probe’s attenuation is set to10:1, 100:1 or 1000:1, the range will be multiplied by10, 100 and 1000 respectively.

• EXT range is ±1 V: –1 V to +1 V in steps of 4 mV

• EXT range is ±10 V: –10 V to +10 V in steps of 40 mV * For DL1540/DL1540L, refer to “EXT (external Trigger)” on this page.

LINE (Line trigger)

Select this when the signal to be displayed is synchronized with the frequency of the commercial power source (50 Hz /60 Hz) and you want to select the commercial power source voltage signal as the trigger source signal.

”, “ ” and “ ” in the same way when one

Activating a Trigger

Points to note when setting the edge trigger

• If the trigger type setting is changed, the edge trigger setting will be invalidated. However, selecting the edge trigger will restore the previous edge trigger setting.

• If the trigger mode is not auto-level mode, the trigger level will not change once it has been set. Thus, changing the amplitude of the trigger signal or changing the offset may invalidate the trigger level, thereby hindering activation of a trigger. Conversely, if the trigger mode is auto-level mode, the median of the amplitude of the trigger signal is detected and the trigger level is set to the median value automatically if the trigger level is invalidated. For a detailed description, refer to 6.8 “Setting the Trigger Mode” (page 6-

12).

Note

If the trigger slope is set to “up/down ”, no trigger can be activated either at “rise ” or “fall ”. In this case, try to set an appropriate hold-off time. This may cause a trigger to be activated. For a description of how to set the hold-off time, refer to page 6-19.

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6.3 Setting the Window Trigger

Keys and Procedure

Rotary knob

Soft keys

TYPE key

LEVEL/SOURCE key

1. Press the TYPE key to display the trigger type selection menu.

2. Press the “WINDOW” soft key.

(For DL1520/DL1520L, “OR”, “PATTERN” and “WIDTH” menus are not displayed. They are optional with DL1540/DL1540L.)

Selecting the trigger condition and setting the window

3. Press the LEVEL/SOURCE key to display the trigger condition

selection menu.

4. Press either soft key “IN” or “OUT”.

5. Press the “CENTER” soft key and set the center level of the window

using the rotary knob.

6. Press the “WIDTH” soft key and set the width of the window using the rotary knob.

Explanation

Selecting the trigger condition and setting the window

The window trigger will only be applied to the input signal of channel 1. Trigger conditions can be selected from the following types.

IN Trigger will be activated when the trigger source level enters a preset voltage range. OUT Trigger will be activated when the trigger source level exits from a preset voltage

range. The center level of the window and the corresponding width can be set. The setting limit and resolution for the trigger level is the same as for the edge trigger. Refer to page 6-2. The smallest width of the window is the CAL setting of the vertical sensitivity.

[IN]

CENTER

WIDTH

Trigger is activated

Window

Trigger is activated

[OUT]

CENTER

Trigger is activated

WIDTH

Points to note when setting the window trigger

• If the trigger type setting is changed, the window trigger setting will be invalidated.

However, selecting the window trigger again will restore the previous settings.

• Auto-mode operations are carried out even if the trigger mode is set to auto-level mode.

Window

6-4

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6.4 Setting the TV Trigger

Keys and Procedure

Rotary knob

Soft keys

TYPE key

LEVEL/SOURCE key

1. Connect the video signal to the CH1 terminal.

2. Press the TYPE key to display the trigger type selection menu.

3. Press the “TV” soft key.

(For DL1520/DL1520L, “OR”, “PATTERN” and “WIDTH” menus are not displayed. They are optional with DL1540/DL1540L.)

Selecting the broadcasting system for the video signal

If OR, PATTERN and WIDTH menus are not provided, the select menu will be displayed next to the trigger type selection menu.

4. Press any of the “NTSC”, “PA L” or “HDTV” soft key to select the desired broadcasting system. (HDTV menu is not provided with DL1520/DL1520L.)

Selecting the field and line number

If OR, PATTERN and WIDTH menus are not provided, the select menu will be displayed next to the trigger type selection menu.

5. Press the “Field” soft key to select the desired field number.

6. Turn the rotary knob to select the desired line number.

Activating a Trigger

Explanation

Selecting the polarity and setting the trigger level

7. Press the LEVEL/SOURCE key to display the polarity/trigger level

setting menu.

8. Press the soft key corresponding to the desired polarity.

9. Turn the rotary knob to set the desired trigger level.

Broadcasting systems with which the TV trigger can be used

NTSC, PAL, HDTV (HDTV menu is not provided with DL1520/DL1520L.)

Selecting the field No. : Field 1 Detects a field in which the vertical synchronizing pulse and the line start at the same

time.

2 Detects a field in which the vertical synchronizing pulse starts 1/2H (H: horizontal scan

time) after the line starts.

X Detects both of the above types of field.

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Page 54

621 622 623 624 625

234567(1)

Field 1

308 309 310 311 312 313 315314 316 318317 320319

Field 2

Line No.

1246 1250

632626

1251

Line No.

933 945

Line Nos. in ( ) cannot be set.

6.4 Setting the TV Trigger

Line No.

Selecting the line No. : Line

A trigger is activated at the beginning of the selected line.

• NTSC : 5 to 1054 Field 1 starts at line No. “5”. (Field 2 starts at line No. “268”.)

Line Nos. in ( ) cannot be set.

Field 1

(1) (2) (3) (4) 567891011121314151617181920212223

524 525

Line No.

526 548

1049 1050

1051 1052

Field 2

262 263264 265266 267268 269270 271272273 274275 276277 278279 280 281282 283284 285

Line No.

261 786 810

•PAL : 2 to 1251 Field 1 starts at line No. “2”. Field 2 starts at line No. “315”.

• HDTV : 2 to 2251 (available on DL1540/DL1540L) Field 1 starts at line No. “2”. Field 2 starts at line No. “565”.

5H 5H 35H

5H 5H 34H

1/2H 1/2H

2251 1126 1127 1128 1129 1130 1131 1132 1166

(1) 234567 41

Field 1

Field 2

2245 2250 1120 1125

1682 1687 1688 1169 1170 1171 1172 1173 1174 1728

557 562 563 564 565 566 567 568 569 603

Line Nos. in ( ) cannot be set.

517H45H

518H45H

Selecting the polarity: Polarity

NTSC /PAL

HDTV

Setting the trigger level : Level

Set the difference between the beginning of the synchronization pulse and the level at which the trigger level is judged. The setting range is from 0.10 div to 2.00 div. The setting resolution is 0.05 div. The default settings are given below.

NTSC/PAL 0.50 div HDTV (available on DL1540/DL1540L) 1.00 div

Points to note when activating a TV trigger

• If the trigger type setting is changed, the TV trigger setting will be invalidated. However,

• Only channel 1 can be used for the video signal. Other channels cannot be used.

• For a TV trigger, the trigger coupling, HF rejection and trigger hysteresis settings are

POSITIVE

Trigger level

Trigger point

Trigger level

Trigger point

Trigger level

selecting the TV trigger again will restore the previous settings.

ignored.

NEGATIVE

Synchronization pulse

Trigger point

6-6

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6.5 Setting the OR Trigger (Optional for DL1540/ DL1540L)

Keys and Procedure

Rotary knob

Soft keys

TYPE key

LEVEL/SOURCE key

Explanation

Types of trigger sources and setting the trigger slope, state and level CH1/CH2/CH3/CH4

Selects which of the input signals CH1 to CH4 will be used as the trigger source. Select the trigger slope/state from the following.

level to the one below the trigger level. X This channel will be skipped as a trigger source. The setting limit and resolution for the trigger level is the same as for the edge trigger. Refer to page 6-2.

1. Press the TYPE key to display the trigger type selection menu.

2. Press the “OR” soft key.

Selecting the trigger source, trigger slope and state and setting the trigger level

3. Press the LEVEL/SOURCE key to display the trigger source

selection menu.

4. Press the soft key corresponding to the desired signal source, and press the corresponding soft key to select the desired trigger slope/state selection.

5. In case you selected “ desired trigger level. Repeat steps 4 and 5 to set the trigger slope, state and level for each trigger source.

” or “ ”, use the rotary knob to set the

Activating a Trigger

Points to note when setting the OR trigger

• If the trigger type setting is changed, the OR trigger setting will be invalidated. However, selecting the OR trigger again will restore the previous settings.

• Auto-mode operations are carried out even if the trigger mode is set auto-level mode.

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Page 56

6.6 Setting the Pattern Trigger (Optional for DL1540/DL1540L)

Keys and Procedure

Rotary knob

Soft keys

1. Press the TYPE key to display the trigger type selection menu and press the “PATTERN” soft key.

2. Press the LEVEL/SOURCE key to display the trigger source/state selection menu.

3. Press the “ClkCH” soft key to display the clock channel selection menu. The default value is “X”.

LEVEL/SOURCE key

TYPE key

Activating a trigger by state pattern only

4. Press the “X” soft key.

5. Press the trigger source soft key and select the state. Do this for all

trigger sources. In case “H” or “L” has been selected, use the rotary knob to set the trigger level as well. Skip to step 7.

Activating a trigger in synchronization with the clock signal

4. Continuing from step 3, select the desired clock channel and press the

corresponding soft key.

5. Select the trigger slope of the clock channel using the soft keys, and then use the rotary knob to set the trigger level.

6. Press the trigger source soft key for the channels which are not clock channel, and select the trigger state. In case “H” or “L” has been selected, use the rotary knob to set the trigger level as well.

6-8

7. Press the “Condtn” soft key and select the desired conditions using

the corresponding soft keys.

• menu in case of activating a trigger by state pattern only

• menu in case of activating a trigger in synchronization with the

clock signal

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Page 57

Explanation

6.6 Setting the Pattern Trigger (Optional for DL1540/DL1540L)

Setting the trigger source and trigger state/level

The trigger state can be selected from the following.

L The trigger source level is above the preset trigger level. H The trigger source level is below the preset trigger level. X Not used as the trigger source.

The setting limit and resolution for the trigger level is the same as for the edge trigger. Refer to page 6-2.

Selecting the clock channel (ClkCH)

Set the clock channel to “X” when no trigger in synchronization with the signal is activated, and select from “CH1 - CH4” when a trigger in synchronization with the signal is activated. The following trigger slopes can be selected.

Slope rising edge (changes from a level below the trigger level to one above the trigger level) Slope falling edge (changes from a level above the trigger level to one below the trigger level)

Selecting the trigger condition: Condtn

• Activating a trigger using only the state pattern

Select the trigger condition from the following.

ENTER Activates a trigger when the combination (pattern) becomes true. EXIT Activates a trigger when the pattern becomes false.

[Setting example] CH1 : H CH2 : L CH3 : X CH4 : X

CH1 input

CH2 input

Pattern becomes false.

Pattern becomes true.

Trigger conditions are met

Condition : ENTER

• Activating a trigger in synchronization with the clock signal

Select the trigger condition from the following. TRUE Activates a trigger on the slope edge (riseor fall) of the clock channel when the

state pattern becomes true.

FALSE Activates a trigger on the slope edge of the clock channel when the state

pattern becomes false.

[Setting example] CH1 : H CH2 : L CH4 : X Clock CH : CH3 Condition : TRUE

CH1 input

CH2 input

CH3 input

Pattern becomes false

Pattern becomes true

Trigger conditions are met

Pattern becomes false

Pattern becomes true

Activating a Trigger

IM 701510-01E

Points to note when setting the pattern trigger

• If the trigger type setting is changed, the pattern trigger setting will be invalidated. However, selecting the pattern trigger again will restore the previous settings.

• Auto-mode operations are carried out even if the trigger mode is set to auto-level mode.

• Select the trigger states for all trigger sources. Make sure to select the trigger slope for the selected clock channel.

• If you want to activate a trigger in synchronization with the clock signal, make sure that the pattern set-up time is 2 ns or more relative to the clock and that the hold-time is 0 ns or less.

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6.7 Setting the Width Trigger (Optional for DL1540/ DL1540L)

Keys and Procedure

Rotary knob

Selecting the width trigger

Soft keys

1. Press the TYPE key to display the trigger type selection menu.

2. Press the “Width” soft key to display the width condition menu.

3. Select the width condition by pressing any of the “PULSE<T”, “PULSE>T” or “TIMEOUT” soft keys.

LEVEL/SOURCE key

TYPE key

Explanation

4. Turn the rotary knob to set the desired pulse time.

Selecting the trigger source/state and setting the trigger level

5. Press the LEVEL/SOURCE key to display the trigger source

selection menu.

6. Press the soft key corresponding to the channel to be used as a trigger source and set the trigger state.

7. Turn the rotary knob to set the desired trigger level.

Selecting the width condition PULSE<T Trigger will be activated when the pulse width of the trigger source becomes

narrower than the preset pulse width.

PULSE>T Trigger will be activated when the pulse width of the trigger source is wider

than the preset pulse width and the state changes.

TIMEOUT Trigger will be activated when the pulse width of the trigger source becomes

wider than the preset pulse width.

6-10

[PULSE<T]

Trigger point

[PULSE>T] [TIMEOUT]

W W

Trigger point

(TIMEOUT)

Trigger point

(PULSE>T)

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6.7 Setting the Width Trigger (Optional for DL1540/DL1540L)

Width setting range and setting steps

Width setting range and setting steps are given below. The setting accuracy of the width is within ± (2 ns + set value x 0.01), approximately.

Setting range Setting steps

5 ns to 9.99 µs 10 µs to 99.9 µs 100 ns 1 ms to 9.999 ms 1 µs 10 ms to 99.99 ms 10 µs 100 ms to 999.9 ms 100 µs

1 s to 9.999 s 1 ms *1 The next pulse width after 5 ns is 10 ns. *2 When the width condition is set to PULSE<T, the smallest setting range is 5 ns; when the

width condition is set to PULSE>T or TIMEOUT, the smallest setting range is 30 ns.

*1, 2

10 ns

Selecting the trigger source/state and setting the trigger level

The trigger source should be selected from CH1 to CH4 Select the trigger state from the following.

H The trigger source level is above the preset trigger level. L The trigger source level is below the preset trigger level.

The setting limit and resolution for the trigger level is the same as for the edge trigger. Refer to page 6-2.

Points to note when setting the width trigger

•A malfunction may occur if pulse intervals are less than 20 ns or more.

20 ns or more

• If the trigger type setting is changed, the width trigger setting will be invalidated. However, selecting the width trigger again will restore the previous settings.

• Auto-mode operations are carried out even if the trigger mode is set to auto-level mode.

Activating a Trigger

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6.8 Setting the Trigger Mode

Keys and Procedure

1. Press the MODE key to display the trigger mode selection menu.

2. Press the soft key corresponding to the desired trigger mode.

• Menu (DL1520)

Soft keys

• Menu (DL1540)

• Menu (DL1520L/DL1540L)

MODE key

Explanation

Selecting the trigger mode

The following six trigger modes are available. The default is “AUTO”.

AUTO (Auto-mode)

Updates the displayed waveform each time a trigger is activated if the trigger condition has become true within the time-out period of approximately 100 ms. Updates the displayed waveform automatically if the trigger condition becomes false within the time-out period. The roll mode will be activated irrespective of the trigger condition if T/div is set to a value greater than 50 ms. However, the roll mode will not be displayed when the history memory function is “ON”.

AT-LVL (Auto-level mode)

Updates the displayed waveform in the same way as auto-mode if the trigger condition has become true within the time-out period. If the trigger condition becomes false, the trigger level is automatically set to the median of the amplitude of the trigger source, and then the waveform is displayed. Auto-level mode is only valid, however, if the edge trigger has been selected as the trigger type. Auto-mode operations are carried out even if auto-level mode has been selected for a trigger other than an edge trigger. Furthermore, roll mode will be activated irrespective of the trigger type if T/div is set to a value greater than 50 ms. However, the roll mode will not be displayed when the history memory function is “ON”.

NORMAL (normal transmission mode)

Updates the displayed waveform only when the trigger condition becomes true. The displayed waveform will not be updated if the trigger condition does not become true. In this mode, it is not possible to judge whether the signal is input or the trigger level is correct unless a trigger is activated. Furthermore, the ground level is not displayed even if the input coupling is set to “GND”. Furthermore, in this mode, roll mode display is never activated, whatever the T/div setting, and waveforms are displayed only when a trigger is activated.

SGL(S) (Single short mode) : for DL1540, SINGLE (Single mode) : for DL1520, DL1520L and DL1540L

When the START/STOP key is pressed and the trigger condition becomes true, the waveform is updated once only and acquisition stops. If the time-axis setting corresponds to roll mode, the oscilloscope generates a roll-mode display. When the trigger occurs, the oscilloscope obtains data for the set record length and then stops the displayed waveform. For details about record length, refer to Appendix 2/Appendix 3.

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6.8 Setting the Trigger Mode

SGL(L) (Single long mode) : for DL1540

This mode is the same as the aboved mentioned SGL(S) mode, except that the record length here is longer. The maximum record length is 120 K words. For more details about the relation between time axis setting, sample rate and record length, refer to Appendix 2.

N-SGL (Single (N) mode) : for DL1520L/DL1540/DL1540L

Each time the trigger condition becomes true after the START/STOP key has been pressed, acquisition is performed the specified number of times. The waveforms will be displayed after acquisition stops. If the START/STOP key is pressed again before acquisition has been completed the specified number of times, acquisition stops immediately. In this case, all the waveform data which has been acquired thus far is valid and can be displayed. This trigger mode can only be used in real time sampling mode. For setting the number of repetitions, refer to page 7-7.

Points to note when setting the trigger mode

• If single short mode or single mode is selected with a T/div setting which enables repetitive time sampling mode, acquisition will stop after it has been repeated the specified number times.

• If trigger mode is changed while acquisition is stopped (i.e. while the START indicator is not lit), acquisition starts automatically.

• For DL1520L/DL1540/1540L if acquisition is interrupted in single (N) mode, only the waveforms which have been acquired completely are displayed.

• For DL1520L/DL1540/1540L if the history memory function is set ON or if the acquisition mode is set to averaging, all single mode triggering cannot be done.

• For DL1520L/DL1540/1540L if single long mode or single (N) mode is selected, repetitive sampling cannot be done.

• When the record length (maximum displayable record length) is 400 K/1 MW for DL1520L, or 400 K/1 MW/2 MW for DL1540L, single mode is the only mode available.

Activating a Trigger

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6.9 Setting the Action-On Trigger

Keys and Procedure

1. Press the SHIFT + MODE (ACTION) key to display the trigger on action selection menu.

2. Press the soft key corresponding to the desired action. Data acquisition

Soft keys

MODE(ACTION) key

START/STOP key

SHIFT key

will stop.

3. In case you selected “FD(P-P)” or “FD(ACQ)”, pressing the “FileName” soft key will display the keyboard. In case you selected “PRINTER”, skip step 4.

4. Use the keyboard to enter the filename. For details on entering characters using the keyboard, refer to page 4-8.

Starting the action on trigger

5. Press the “EXEC” soft key to restart acquisition. The selected action

will be validated when a trigger is activated.

Stopping the action on trigger

6. Press the “ABORT” soft key to stop acquisition.

Explanation

Selecting the action-on trigger

The action can be selected from the following.

PRINTER Outputs hardcopy to the built-in printer. FD(P-P) Saves all the displayed waveforms (as P-P compressed data) on a floppy disk

when a trigger is activated.

FD(ACQ) Saves all the displayed acquisition data (binary data) on a floppy disk when a

trigger is activated. When the action on trigger starts, the trigger mode will change automatically to the single short mode or single mode.

Specifying a file name when “FD(P-P)” or “FD(ACQ)” has been selected as the trigger action

A file No. (starting from “0001”) is assigned to each waveform data automatically when the data is saved on a floppy disk. It is possible to insert a common file name (character string consisting of up to four characters) before the assigned file No. (for instance, “TRGO0001”). The entered file name is reset when “ABORT” is selected.

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6.9 Setting the Action-On Trigger

Points to note when using the action on trigger

• When you change the trigger mode to any other than the single short mode or single mode, the trigger on action will be aborted.

• It is not possible to perform auto set-up or GO/NO-GO determination while the action on trigger is in progress.

• When the action on trigger starts, the trigger mode will change automatically to the single short mode or single mode. Even after canceling the action on trigger, the previous trigger mode will not be restored.

• When the action on trigger is restarted (“EXEC”) after first being aborted (“ABORT”), the automatically assigned file No. will start from 0001. Previous saved data will therefore be overwritten.

• For DL1520L/DL1540L, note that under “FD(ACQ)” action, ACQ-data record length may in some cases be too long to be saved onto a single floppy disk. In this case the screen will display an error message after saving data to the initial floppy disk.

Activating a Trigger

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6.10 Setting the Trigger Coupling and HF Rejection

Keys and Procedure

1. Press the COUPLING key to display the trigger coupling selection menu.

2. Press the soft key corresponding to the desired trigger coupling.

Soft keys

COUPLING key

Explanation

Selecting the Trigger coupling

The following types are available. AC The trigger source signal is used as the trigger source after the DC content has been

removed. The trigger level becomes 0 V.

DC The trigger source signal is used as the trigger source without any processing. The

trigger level becomes the center of the amplitude of the trigger source. The default value is “AC”. The trigger coupling setting applies to all channels simultaneously.

3. In case you want to set HF rejection, press the “ON” soft key at the “HF-Rej” field.

Turning HF rejection ON/OFF

Set to “ON” if you want to use the trigger source signal as the trigger source after the high frequency content (frequency contents exceeding approximately 15 kHz) has been removed.

Points to note when setting the trigger coupling and HF rejection

These settings will be ignored if “EXT” or “LINE” is selected as the trigger source or “TV” is selected as the trigger type. However, the setting made for EXT will be valid (for DL1520/DL1520L).

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6.11 Changing the Trigger Position

Keys and Procedure

1. Press the POSITION/DELAY key to display the trigger position/

delay setting menu.

2. Press the soft key to set the desired trigger position. Depending on the

Soft keys

POSITION/DELAY key

Explanation

Selecting the trigger position

• The trigger position can be selected from the following. As shown in the menu above, the selection varies depending on the model or the software (ROM) version.

+4div +4 divisions from the center of the waveform display frame +2div +2 divisions from the center of the waveform display frame 0div the center of the waveform display frame –2div –2 divisions from the center of the waveform display frame –4div –4 divisions from the center of the waveform display frame

model or the software (ROM) version, the trigger position can also be set using the rotary knob.

• Menu (DL1520/DL1520L/DL1540 with software (ROM) version 1.20 or later/DL1540L with software (ROM) version

1.20 or later)

• Menu (DL1540 with software (ROM) version before 1.20/ DL1540L with software (ROM) version before 1.20)

Activating a Trigger

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–2div +2div

–4div 0div

• Depending on the model or the software (ROM) version, the trigger position can be set with in steps of 1/50 div using the rotary knob.

Setting the trigger delay and trigger position

The trigger position indicates which position of the waveform in the acquisition memory will actually be displayed on the screen. The trigger point refers to the point at which a trigger is activated. If no delay time has been set (i.e. delay time: 0 s), the trigger position and the trigger point refer to the same location. However, if a delay time is set using the trigger delay, the trigger position must be moved using the above operations, since the delay point will not match the trigger point. For more details on delays, refer to the next page.

T(Trigger position) T (Trigger position)

Delay time Delay time

Trigger point Trigger point

Points to note when setting the trigger position

• If the trigger position is changed while acquisition is not in progress (i.e. while the START indicator is not lit), the setting will not be valid until acquisition starts and the waveforms are updated.

• The time measured by cursor measurement will change if the trigger position is changed, because the trigger position is used as the reference position (except when the roll mode is being displayed).

+4div

Move the trigger position to the right

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6.12 Setting the Trigger Delay

Keys and Procedure

Rotary knob

POSITION/DELAY key

Explanation

1. Press the POSITION/DELAY key to display the delay time setting menu.

2. Turn the rotary knob to set the desired delay time. You can also use the < or > keys.

• Menu (DL1520/DL1520L/DL1540 with software (ROM)

version 1.20 or later/DL1540L with software (ROM) version

1.20 or later)

• Menu (DL1540 with software (ROM) version before 1.20/

DL1540L with software (ROM) version before 1.20)

Setting the delay time

The trigger delay time is the duration between the point at which a trigger is activated, and the point at which data acquisition starts.

T(Trigger position)

Delay time

Trigger point

The setting range is 0 to 9.999 s. The setting step is as follows.

Setting time Setting step

0 to 999.9 ns 0.1 ns 1 µs to 9.999 µs1 ns 10 µs to 99.99 µs 10 ns 100 µs to 999.9 µs 100 ns 1 ms to 9.999 ms 1 µs 10 ms to 99.99 ms 10 µs 100 ms to 999.9 ms 100 µs 1 s to 9.999 s 1 ms

Points to note when setting the delay time

A delay time cannot be set if the external clock has been selected as the timebase. The setting will be invalid if sampling is performed using the external clock.

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6.13 Setting the Hold-off Time

Keys and Procedure

Rotary knob

Soft keys

HOLD OFF key

<, > keys

1. Press the HOLD OFF key to display the hold-off time setting menu.

2. Turn the rotary knob to set the desired hold-off time. You can also use

the < or > keys. Turning the rotary knob switches the “Mode” ON automatically.

3. To deactivate the hold-off function, press the “Mode” soft key and

select “OFF”.

Explanation

Hold-off time setting

The hold-off time setting range is 0.2 µs to 9.999 s. The hold-off time will be 0.2 µs (minimum) if initialization is performed or if hold-off mode has been turned “OFF”.

Turning the hold-off function ON/OFF

The hold-off time which has been set will be retained even if the hold-off function is set to OFF. If the hold-off function is switched ON again, the hold-off time which was in effect before the hold-off function was switched OFF will be restored.

Points to note when setting the hold-off time

• If the hold-off time has been set to 100 ms or more, do not switch the trigger mode to auto-mode or auto-level mode. No trigger can be activated properly, as this conflicts with the time-out period (100 ms).

• The waveform updating interval may get longer depending on the hold-off time. In this case, switch the hold-off function OFF or change the hold-off time.

Activating a Trigger

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7.1 Selecting Acquisition Mode, Sampling Mode, and Record Length for DL1520L/DL1540L

Keys and Procedure

Rotary knob

Soft keys

ACQ key

1. Press the ACQ key to display the acquisition mode/sampling mode setting menu. “Length” menu is provided with DL1520L/DL1540L.

2. Press the soft key corresponding to the desired acquisition mode.

When averaging mode is selected

3. Turn the rotary knob to set the desired averaging count (attenuation

constant).

Selecting sampling mode

2. After step 1 has been completed, press the “Rep” soft key and select

“ON” for real-time sampling mode or “OFF” for repetitive sampling mode.

Explanation

Selecting the record length (maximum displayable record length), (for DL1520L/DL1540L)

2. After step 1 has been completed, press the “Length” soft key. The

screen returns the length selection menu. For DL1520L, “2M” menu is not displayed

3. Press the soft key corresponding to the maximum displayable record length that you want to use.

Selecting acquisition mode

Acquisition mode can be selected from the following modes. The default setting is “NORMAL”.

• NORMAL (normal mode)

Sampled data is stored in the acquisition memory without specific data processing.

• ENVELOPE (Envelope mode)

The data is sampled at 100 MS/s. Each time data is stored in the acquisition memory, the maximum and minimum values are extracted. These are then stored in the acquisition memory and used to display the envelope waveform.

•AVERAGE (Averaging mode)

The averaging count can be set to values between “1” and “256” in steps of 2 n.

An = {(N - 1)An - 1 + Xn}

: Value obtained after nth averaging

: nth measured value

: Attenuation constant

Changing Acquisition and Display Conditions

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7.1 Selecting Acquisition Mode, Sampling Mode, and Record Length for DL1520L/DL1540L

Selecting sampling mode: Repetitive

A sampling mode can be selected provided that the selected T/div setting allows sampling both in real-time and repetitive modes. However, the repetitive sampling mode is not effective when the trigger mode is set to single long mode. Furhermore, the repetitive sampling mode cannot be set in case of the single (N) trigger mode, when the history memory function is used, or in case FFT is used. T/div settings which enable the selection of the sampling mode are from 5 µs to 100 ns/div.

Selecting the (maximum displayable) record length, for DL1520L/DL1540L

You can set the maximum displayable record length to 1 KW, 10 KW, 100 KW, 400 KW, 1 MW, or 2 MW (for DL1540L only). The default selection is 10 KW. The following restrictions apply.

•Time-axis settings from 50 ns to 5 ns cannot be used in combination with 400 KW, 1 MW, and 2 MW record lengths. If the time-axis value is already set within this range, the 400 KW, 1 MW, and 2 MW selections will not be available.

• If the selected record length is 400 KW or 2 MW, certain time-axis settings will produce waveform display over eight divisions only, with no waveform appearing over the two rightmost time-axis divisions.

• Selection of 400 KW, 1 MW, and 2 MW record lengths is available only if trigger mode is “single.”

• For DL1540L, it is not possible to switch on Channel 3 or Channel 4 while record length is set to 2 MW. It is not possible to select 2 MW as the record length while Channel 3 or Channel 4 is on.

• For DL1520L, it is not possible to switch on Channel 2 or trace MATH while record length is set to 1 MW. It is not possible to select 1 MW as the record length while Channel 2 or trace MATH is on.

• Refer to Appendix 3 for information about the relationship between time axes, sampling rates, and record lengths.

Points to note when making acquisition mode and sampling mode settings

• Normal mode operations are carried out, even if envelope mode has been selected.

• It is not possible to select envelope mode if waveforms are sampled by the external clock.

• If each single mode has been selected as the trigger mode or if the history memory function has been set to ON, averaging mode cannot be selected.

• If auto-mode or auto-level mode has been selected as the trigger mode and T/div has been set such that the display is in roll mode, averaging will not be performed, even if averaging mode is selected. In this case, waveforms are displayed in roll mode.

• It is not possible to select envelope mode if input smoothing or FFT has been set to ON.

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7.2 Setting the Input Filter

f0.5f0.13f

Frequency

0 dB

-3 dB

f : Sample frequency

Attenuation

Keys and Procedure

Rotary knob

Soft keys

FILTER key

Explanation

Bandwidth limit

The bandwidth frequency limit can be “20MHz”. The frequency characteristic when the bandwidth limit is applied is shown below. When “FULL” is selected, the frequency bandwidth is 150 MHz.

-3 dB

1. Press the FILTER key to display the input filter setting menu. Applying the bandwidth limit

2. Press the “20 MHz” soft key to apply the bandwidth limit. To cancel the bandwidth limit, select “FULL”.

Applying the smoothing function

2. After step 1 has been completed, press the “Smoothing” soft key and select “ON”. To stop smoothing, select “OFF”.

Changing Acquisition and Display Conditions

20 MHz

Smoothing process

A moving average value is obtained for each five points of sampling data and the data obtained is used when displaying the waveform. This process is performed on the data in the acquisition memory, so it can still continue even if acquisition is stopped. The following frequency characteristic of the smoothing process is dependent on the sample rate. The attenuation rate will be –3 dB when the frequency is approximately 13% of the sample rate. When the acquisition mode is envelope mode, this process cannot be carried out.

FULL(150 MHz)

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7.3 Zooming the Waveform

Keys and Procedure

Rotary knob

Soft keys

ZOOM key

1. Press the ZOOM key to display the zoom setting menu. Displaying the pre-zoom and expanded waveform

2. Press the “MainZoom” soft key of the “ZOOM Mode” setting. The

expansion rate and position selection menu appears.

Setting the expansion rate and position

3. After having pressed the “ZOOM” soft key of the “ZOOM Knob”

setting, use the rotary knob to adjust the expansion rate.

4. After having pressed the “POS” soft key of the “ZOOM Knob” setting, use the rotary knob to adjust the position.

Displaying the expanded waveform only

2. After step 1 has been completed, press the “ZOOM” soft key of the

“ZOOM Mode” setting. The expansion rate and position are as described in step 3 and 4.

Explanation

Displaying the pre-zoom waveform only

2. After step 1 has been completed, press the “MAIN” soft key of the

“ZOOM Mode” setting. The expansion rate and position are as described in step 3 and 4.

Expansion Rate

• Expansion rate limits

The expansion rate which can be set varies according to the specified record length of the pre-zoom waveform. The specified record length depends on the model, time axis setting, sampling mode and trigger mode. For more details, refer to Appendix 2/Appendix 3. The following table shows the maximum expansion rates for some record lengths.

Displayed record length 2M(8div) 2M 1M 800K(8div) 500K 400K(8div)

Maximum expansion rate 25000 20000 10000 10000 5000 5000 Setting position step (div) 0.00002 0.00001 0.00001 0.00001 0.00002 0.00002

Displayed record length 400K 200K 160K(8div) 100K 50K 40K

Maximum expansion rate 4000 2000 2000 1000 500 400 Setting position step (div) 0.00005 0.00005 0.00005 0.0001 0.0002 0.0005

7-4

Displayed record length 20K 10K 5K 4K 2K 1K

Maximum expansion rate 200 100 50 40 20 10 Setting position step (div) 0.0005 0.001 0.002 0.005 0.005 0.01

Displayed record length 500 400 200 100

Maximum expansion rate 5 4 2 1 Setting position step (div) 0.02 0.05 0.05 0.1

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7.3 Zooming the Waveform

• Expansion rate steps

Depending on the T/div value, the expansion rate steps are as follows. In case of 50 s, 5 s, 500 ms, 50 ms, 5 ms, 500 µs, 50 µs and 5 µs/div x1, x2.5, x5, x10, x25, x50, x100, x250, x500, x1000, x2500, x5000, x10000, x25000 In case of 20 s, 2 s, 200 ms, 20 ms, 2 ms, 200 µs and 20 µs/div x1, x2, x4, x10, x20, x40, x100, x200, x400, x1000, x2000, x4000, x10000, x20000 In case of 10 s, 1 s, 100 ms, 10 ms, 1 ms, 100 µs and 10 µs/div x1, x2, x5, x10, x20, x50, x100, x200, x500, x1000, x2000, x5000, x10000, x20000

• Zooming range position

The center of the zooming position box can be set within ±5 div of the waveform display frame. The setting step depends on the displayed record length.

Selecting the display type when displaying an expanded waveform

The type of display can be selected from the following.

OFF Only the original display will be displayed; MAIN The pre-zoom waveform together with the zoom box will be displayed; ZOOM Only the expanded waveform will be displayed. The part of the pre-zoom

waveform selected in the zoom box will be expanded.

MainZoom Both the original and the expanded waveform will be displayed on the screen,

which is divided in two.

Selecting the display type when displaying an X-Y waveform

The type of display depends on the settings in the expansion menu. For X-Y mode, refer to page 7-13.

ZOOM mode X-Y Mode

OFF X-Y T-Y & X-Y

OFF V-T pre-zoom X-Y pre-zoom V-T pre-zoom waveform (upper)

waveform waveform X-Y pre-zoom waveform (lower)

MAIN V-T pre-zoom X-Y pre-zoom V-T pre-zoom waveform

waveform waveform + zoom box (upper) + zoom box X-Y pre-zoom waveform (lower)

ZOOM V-T expanded X-Y expanded V-T expanded waveform (upper)

waveform waveform X-Y expanded waveform (lower)

MainZoom V-T pre-zoom X-Y expanded V-T pre-zoom waveform

waveform waveform + zoom box (upper) + zoom box (upper) X-Y expanded waveform (lower) V-T expanded waveform (lower)

Changing Acquisition and Display Conditions

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Selecting the display type in case of FFT mode (power spectrum)

The type of display depends on the settings in the expansion menu. For more details on the power spectrum, refer to page 8-18.

ZOOM mode FFT Mode

FFT OFF FFT VT & FFT

OFF V-T pre-zoom FFT pre-zoom V-T pre-zoom waveform (upper)

waveform waveform FFT pre-zoom waveform (lower)

MAIN V-T pre-zoom FFT pre-zoom V-T pre-zoom waveform

waveform waveform + zoom box (upper) + zoom box FFT pre-zoom waveform (lower)

ZOOM V-T expanded FFT expanded V-T expanded waveform (upper)

waveform waveform FFT expanded waveform (lower)

MainZoom V-T pre-zoom FFT expanded V-T pre-zoom waveform

waveform waveform + zoom box (upper) + zoom box (upper) FFT expanded waveform (lower) V-T expanded waveform (lower)

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7.3 Zooming the Waveform

Points to note when displaying an expanded waveform

• The waveform zone cannot be edited during GO/NO-GO if both pre-zoom waveform and its expanded waveform are displayed at the same time.

• If you press the ZOOM Mode soft key while accumulated waveform display is in progress, accumulated waveform display will be reset.

• If you press the ZOOM Mode soft key while a snapshot waveform display is being displayed, the snapshot waveform will disappear.

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7.4 Acquiring Waveforms using the Sequential Store Function (for DL1520L/DL1540/DL1540L)

Keys and Procedure

Rotary knob

CLEAR TRACE key

Soft keys

MODE key

START/STOP key

Acquiring the waveform data only a specified number of times

1. Press the MODE key to display the trigger mode setting menu.

2. Press the “N-SGL” soft key. When a trigger is activated at the time the

“N-SGL” soft key is pressed, waveform acquisition starts. For DL1520L/DL1540L, “SINGLE” menu will be displayed instead of “SGL(S)” and “SGL(L)” menus.

3. Turn the rotary knob to set the number of acquisitions at “Acquisition Count (N)”. When waveform acquisition is already in progress and you change the number of acquisitions, make sure to restart to get the specified number of acquisitions.

4. If no trigger has been activated already, press the START/STOP key or once more the “N-SGL” soft key to start data acquisition.

Displaying a specific acquired data by selecting its number

5. Press the CLEAR TRACE key to clear the displayed waveforms.

6. Press the DISPLAY key to display the display selection menu.

7. Use the rotary knob to set the number of the data you want to see. The

corresponding waveform will appear at the same time.

Changing Acquisition and Display Conditions

Displaying a specific acquired data by selecting its time of acquisition

8. Continuing from step 6, press the “Time Stamp” soft key to display

the list of acquired data with their acquisition times.

9. Use the rotary knob to highlight the data you want to see.

10. Press the SELECT key. The list will disappear and the selected

waveform will appear on the screen.

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7.4 Acquiring Waveforms using the Sequential Store Function (for DL1520L/DL1540/DL1540L)

Displaying all waveforms

11. Continuing from step 6, 7 or 10, press the “ALL disp EXEC” soft

key to display all waveforms.

Explanation

Number of acquisitions: Acquisition Count (N)

• For DL1540, this setting specifies the number of times that data acquisitions will be stored in memory, and ranges from 1 to 100. 100 is default setting.

• For DL1520L/DL1540L, the record length per iteration (for a given channel) and the number of allowable iterations are determined by the selected maximum displayable record length (see page 7-2), as indicated below. Under default settings the record length is 10 KW, and 100 iterations are stored.

Maximum Displayable Supported Iteration Record Length per

Record Length Settings Waveform Iteration (per channel)

DL1520L DL1540L

1 KW 1 to 100 1 to 100 Same as “displayed record length” in

10 KW 1 to 50 1 to 100 Same as “displayed record length” in

100 KW 1 to 5 1 to 10 Same as “displayed record length” in

• For DL1520L/DL1540L, 400 KW or above: Function is not supported.

• The number of acquired data can be viewed in the upper side of the screen, where the indication such as “Count=9” appears.

App. 3 (page App-5)

App. 3 (page App-6)

App. 3 (page App-7)

Displaying acquired data: Display Trace

The way of displaying the acquired data can be selected from the following.

• Displaying the selected waveform only

Selecting the waveform can be done by setting the Display Number or by highlighting data from the Time Stamp list.

• Displaying all waveforms

When all waveforms are displayed, you can easily spot the waveform which is selected by the Display Number since it is displayed more brightly.

Selecting the waveform to be displayed: Display Number

The setting ranges from 0 to –(the acquisition count number –1). The maximum value is 0. The latest data being 0, previous data are labeled –1, –2, –3, etc..

Points to note when using the sequential store function

• For more details on trigger modes, refer to page 6-12.

• After the data is acquired the specified number of times, all the waveforms will appear on the screen at once.

• Data will not be acquired in case of the repetitive sampling mode.

• If data acquisition is aborted while in progress, only the waveforms which have been acquired so far will appear on the display. Only the acquired waveforms can be selected at the Display Number setting.

• The all single modes will be deacivated when the history memory function is turned ON.

•Trigger mode cannot be set to “single (N) mode” if the selected record length is 400 KW, 1 MW, or 2 MW (for DL1540L only).

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7.5 Using the History Memory Function (for DL1520L/DL1540/DL1540L)

Keys and Procedure

Rotary knob

CLEAR TRACE key

Soft keys

1. Press the HISTORY (for DL1520L, SHIFT + ACQ(HISTORY)) key to display the history memory ON/OFF setting menu.

2. Press the “History” soft key and select “ON”. To select “OFF”, press the “History” soft key again.

Displaying a waveform from the memory

3. Stop data acquisition by pressing the START/STOP key.

HISTORY key

(Not provided with

DL1520/DL1520L)

ACQ(HISTORY) key

SHIFT key

Displaying a specific data by selecting its number

4. Use the rotary knob to set the number of the data you want to see

(display number). The corresponding waveform will appear on the screen.

Displaying a specific acquired data by selecting its time of acquisition

5. Continuing from step 3, press the “Time Stamp” soft key to display

the list of acquired data with their acquisition times.

6. Use the rotary knob to highlight the data you want to see.

Changing Acquisition and Display Conditions

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7. Press the SELECT key. The list will disappear and the selected

waveform will appear on the screen.

Displaying all waveforms

8. Continuing from step 3, 4 or 7, press the “ALL Disp EXEC” soft key.

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7.5 Using the History Memory Function (for DL1520L/DL1540/DL1540L)

Explanation

Number of waveforms in the history memory

• Acquisition memory retains waveforms for the last N triggers, where N is equivalent to the maximum number of iterations that can be stored under sequential-store operation.The record length per waveform (on a given channel) is the same as that for sequential-store mode. For details, refer to page 7-8.

• Once the history has become full (the number of triggers has exceeded N), each new waveform acquisition deletes the oldest waveform in the history.

Displaying acquired data

Refer to page 7-8.

Selecting the waveform to be displayed: Display Number

The setting ranges from 0 to 99. The latest data being 0, previous data are being labeled –1, –2, –3, etc..

Acquisition period

You can extend the acquisition period by setting the hold-off time, which temporarily halts the trigger detection. This feature makes it possible to obtain a history of a periodically occurring waveform.

Points to note when using the history memory function

• Data will not be acquired in case of the repetitive sampling mode.

• The history memory function cannot be turned ON when the acquisition mode is set to average, or when the trigger mode is set to SINGLE, SGL(S), SGL(L), or N-SGL.

• When the history memory function is set to ON, the display cannot be in the roll mode.

• The previously acquired waveforms will not appear on the screen while acquisition is in progress.

•Waveforms will be acquired in the memory even if the display of the input signals has been turned OFF. To display the acquired waveforms however, the display of the input signals should be set to ON. Refer to page 5-1.

• When the conditions of waveform acquisition are changed, the history memory function will be reset and previous waveform data will be lost.

• The history-memory function cannot be switched on if the selected record length is 400 KW, 1 MW, or 2 MW (for DL1540L only).

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7.6 Changing the Interpolation Settings

Keys and Procedure

Royary knob

Soft keys

DISPLAY key

Explanation

Selecting the interpolation type: Intrpl

The following four interpolation types are available. The default is “SINE”.

OFF No interpolation; Displays the sampling data as a horizontal line. LINE Interpolates between two dots with a straight line. SINE Generates interpolation data using a sine function and interpolates between two

PULSE Draws a horizontal line to a point directly above or below the next data point and

1. Press the DISPLAY key to display the setting menu.

2. Press the “Intrpl” soft key to display the interpolation selection menu.

3. Press the soft key corresponding to the desired interpolation type.

dots using a sine curve.

then interpolates using two dots so that the end of the horizontal line is connected to the next data point by a vertical line.

Changing Acquisition and Display Conditions

Note

LINE, SINE and PULSE can only be selected if the number of display points per division is 50 or less. OFF can always be selected.

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7.7 Displaying an Accumulated Waveform

Keys and Procedure

Rotary knob

Soft keys

DISPLAY key

Explanation

Setting the accumulation time

The accumulation time can be selected from the following. The default settings is “100ms”.

100ms, 200ms, 300ms, 400ms, 500ms, 600ms, 700ms, 800ms, 900ms, 1s, 2s, 3s, 4s, 5s, 6s, 7s, 8s, 9s, 10s, 20s, 30s, 40s, 50s, 60s, INFINITE

Intensity of the accumulated waveform

The most recent waveform is bright and old waveforms (accumulated waveforms) are dark.

1. Press the DISPLAY key to display the setting menu.

2. Turn the rotary knob to set the desired accumulation time. Turning the rotary knob automatically sets the “Accumu” setting to “ON”.

3. To cancel the accumulation function, select “OFF”.

Clearing the accumulated waveform

Pressing the CLEAR TRACE key clears all accumulated waveforms except the most recent one.

Points to note

• The following operations apply only to the latest waveform’s data if they are performed using accumulated waveform display.

-Cursor measurements and automated measurements

-Saving the waveform data

• If you want to stop accumulation, press the START/STOP key to stop measurement. Pressing the START/STOP key again to restart measurement will clear the previously displayed waveforms and the accumulation time will be reset.

•Waveforms which can be accumulated are Pre-zoom waveforms, expanded waveforms and X-Y waveforms. However, if both V-T waveform and X-Y waveform are displayed at the same time, the V-T waveform cannot be accumulated.

• When the display type (ZOOM Mode setting) is changed during expansion display of an X-Y waveform, the currently accumulated waveforms will be cleared and accumulation will start again.

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7.8 Displaying an X-Y Waveform

Keys and Procedure

1. Press the DISPLAY key to display the setting menu.

2. Press the “X-Y” soft key to display the X-Y selection menu.

Soft keys

When displaying both the X-Y waveform and the T-Y waveform

3. Press the “T-Y & X-Y” soft key. When displaying the X-Y waveform only

3. After step 2 has been completed, press the “X-Y” soft key. When displaying the T-Y waveform only

3. After step 2 has been completed, press the “OFF” soft key.

DISPLAY key

Explanation

Assigning channels to the X axis (horizontal axis) and Y axis (vertical axis)

The assignment has been pre-determined as follows. The CH1 input voltage is assigned to the X axis and the CH2 input voltage to the Y axis. An X-Y waveform can also be displayed for acquisition data loaded from a floppy disk. In this case, the trace No. will simply be replaced by the channel No.

Changing Acquisition and Display Conditions

Selecting the display type

The display type can be selected from the following three types.

OFF Displays only the V-T waveform. X-Y Displays only the X-Y waveform. In case the zoom setting has been set to

ZOOM, the display will show the expanded waveform as specified in the zoom box.

T-Y & X-Y Displays both the V-T waveform and the X-Y waveform. The display depends

on the zoom settings. Refer to X.X for more details.

Points to note when displaying an X-Y waveform

• When displaying X-Y waveforms, only measurement of “Integ1XY” and “Integ2XY” is possible during automated measurement. For a description of measurement operations and the measured parameters, refer to 8.3.

• If both the V-T and X-Y waveforms are displayed, the V-T waveform will not be accumulated. If the display mode is switched, accumulated waveform display will be reset.

• When you want to display a sequentially stored waveform or one stored in history memory as an X-Y waveform, you turn the rotary knob to select a [display number]. However, all the selected waveforms will appear on the screen. In order to display one selected waveform only, press the CLEAR TRACE key after selection.

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7.9 Changing the Graticule, Scale and % Marker Settings

Keys and Procedure

1. Press the SHIFT + DISPLAY (DISPLAY FORM) key to display the display condition setting menu.

Changing the graticule type

Soft keys

DISPLAY(DISPLAY

FORM) key

Explanation

SHIFT key

Graticule

The graticule type can be selected from the following two types. The default is “GRID”.

FRAME GRID

2. Select by pressing the “FRAME” or the “GRID” soft key.

Turning the scale ON/OFF

2. After step 1 has been completed, press the “Scale” soft key and select “ON” or “OFF”.

Turning the % Marker ON/OFF

2. After step 1 has been completed, press the “% Marker” soft key and select “ON” or “OFF”.

Scale

The cross type scale, shown below, can be turned ON or OFF. The default is “ON”.

Scale ON Scale OFF

% Marker

The % marker, shown below, can be turned ON or OFF. The default is “OFF”.

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7.10 Turning the Waveform Information Display ON/ OFF

Keys and Procedure

1. Press the SHIFT + DISPLAY (DISPLAY FORM) key to display the display condition setting menu.

2. Press the “Wave Info” soft key and select either “ON” or “OFF”.

Soft keys

DISPLAY(DISPLAY

FORM) key

Explanation

SHIFT key

Selecting the waveform information display ON/OFF

The information display can be selected “ON” or “OFF”. The default is “ON”. OFF Displays only the time axis setting, acquisition mode, and sample rate. This is useful

if the displayed waveform information prevents observation of other waveforms.

ON Displays the channel No./ voltage axis sensitivity settings/ input coupling/ probe

attenuation as shown below in addition to the “OFF” display. For DL1520/DL1520L, CH3 and CH4 are not displayed.

Changing Acquisition and Display Conditions

Channel No.

Voltage axis sensitivity

Probe attenuation

Input coupling

Points to note concerning the waveform information display

• If a recalled waveform is displayed, the memory number and the voltage axis sensitivity will be displayed.

• If P-P waveform data loaded from a floppy disk is displayed, the file name and the voltage axis sensitivity will be displayed. Up to 8 characters of the file name will be displayed, but overlap may occur with other displayed file names (depending on the size of the used characters).

• If ACQ waveform data loaded from a floppy disk is displayed, the channel No., voltage axis sensitivity, input coupling and probe attenuation will all be displayed at the site of the waveform. The channel No. of the channel for which acquisition has been halted (i.e. for which “ACQ Hold” is set to “ON”) will be highlighted.

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7.11 Changing the Screen Intensity

Keys and Procedure

Rotary knob

Soft keys

DISPLAY(DISPLAY

FORM) key

Explanation

SHIFT key

Intensity

Intensity can be set to one of 15 levels, with the darkest intensity “1” and the brightest intensity “15”.

1. Press the SHIFT + DISPLAY (DISPLAY FORM) key to display the display condition setting menu.

2. Press the “Inten” soft key to display intensity selection menu.

3. Press the soft key corresponding to the item for which the intensity is

to be changed.

4. Turn the rotary knob to set the desired intensity.

5. Repeat step 3 and 4 to adjust the intensity of other items.

Items for which the intensity can be adjusted

Intensity can be adjusted independently for the following items. The value in ( ) indicates the default setting.

TEXT (9) : Characters, value SCALE (6) : Graticule, scale, % marker CURSOR (10) : Cursor SNAPSHOT (5) : Snapshot waveform WAVE (8) : All waveform except snapshot ALL (8) : The entire screen

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8.1 Measuring a V-T Waveform using Cursors

Keys and Procedure

Rotary knob

Soft keys

CURSOR key

<, > keys

1. Press the CURSOR key to display the cursor measurement setting

menu.

2. Press the “Cursor” soft key and select “ON”.

3. Press the “Type” soft key to display the measurement type selection

menu.

Measuring time difference/ frequency/ voltage/ voltage difference using the vertical cursors

4. Press the “V-T” soft key to display the cursor selection menu. Two

vertical cursors will appear on the screen.

5. Press the “Trace” soft key to display the trace selection menu.

6. Press the soft key corresponding to the trace you want to measure.

For DL1520/DL1520L, menus such as “1”, “2”, “MATH”, “LOAD1”, “LOAD2” and “ALL” are displayed instead of the trace selection menu shown below.

Analyzing Waveforms

7. After having pressed any of the “T1”, “T2” or “T1&T2” soft keys, use

the rotary knob to adjust the position of the cursor.

Measuring only the time difference using the vertical cursors

4. After step 3 has been completed, press the “dT” soft key to display the

cursor selection menu. Two vertical cursors will appear on the screen.

5. After having pressed any of the “T1”, “T2” or “T1&T2” soft keys, use

the rotary knob to adjust the position of the cursor.

Measuring only the voltage difference using the horizontal cursors

4. After step 3 has been completed, press the “dV” soft key to display the

cursor selection menu. Two horizontal cursors will appear on the screen.

5. Press the “Trace” soft key to display the trace selection menu.

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8.1 Measuring a V-T Waveform using Cursors

Explanation

Waveforms which cannot be measured using cursors

The following waveforms are excluded from measurements using cursors.

• Snapshot waveform;

• Accumulated waveforms other than the most recent one;

•Waveforms other than those which are specified (by Display Number) and displayed (by Display Trace) using the sequential store or history memory function.

Selecting the measurement waveform: Trace

When “V-T” or “dV” has been selected at the type selection menu, the following can be selected at the trace menu. The menu is divided into two menus, which can be reached using the “PrevMenu” and “NextMenu” soft keys.

1-4 Measurements will only be performed on the selected trace; LOAD1-4 Measurements will only be performed on the selected loaded waveform; ALL (in case of “V-T” only) Measurements will be performed on all traces and

loaded waveforms.

* For DL1520/DL1520L, a selection menu is used to select one of “1”, “2”, “MATH”, “LOAD1”,

“LOAD2” and “ALL”. “ALL” is displayed only when “V-T” is selected as the target to be measured.

6. Press the soft key corresponding to the trace you want to measure. For DL1520/DL1520L, menus such as “1”, “2”, “MATH”, “LOAD1” and “LOAD2” are displayed instead of the trace selection menu shown below.

7. After having pressed any of the “H1”, “H2” or “H1&H2” soft keys, use the rotary knob to adjust the position of the cursor.

T1 cursor T2 cursor

H2 cursor

H1 cursor

Measurement items

The following items can be measured.

• Using vertical cursors to measure time difference/ frequency/ voltage/ voltage difference : V-T

In all cases excluding “ALL”

T1 Time difference between position of cursor T1 and trigger position T2 Time difference between position of cursor T2 and trigger position DT Time difference between positions of cursors T1 and T2 1/DT Reciprocal of DT (frequency) V1(X) Voltage at the position where the waveform intersects cursor T1 V2(X) Voltage at the position where the waveform intersects cursor T2 DV(X) V2-V1

(X) indicates the waveform of measurement, e.g. LOAD1 is shown as (L1) In the case of “ALL”

T1 Time difference between position of cursor T1 and trigger position* T2 Time difference between position of cursor T2 and trigger position* DT Time difference between positions of cursors T1 and T2 1/DT Reciprocal of DT (frequency) V1(X) Voltage at the position where all waveforms intersect cursor T1. The waveform

of measurement is indicated between brackets.

* In case of roll mode, this is not the trigger position, but the center of the acquisition memory

record length. This position is shown at the 0div in the figure on page 1-7.

• Using vertical cursors to only measure time difference : dT

DT Time difference between positions of cursors T1 and T2 1/DT Reciprocal of DT (frequency), for DL1520/DL1520L

8-2

• Using horizontal cursors to only measure voltage difference : dV DV(X) V2-V1; where V2 is the position where the waveform intersects cursor H2, and

V1 is the position where the waveform intersects cursor H1.

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8.1 Measuring a V-T Waveform using Cursors

Cursor movement method

The cursors can be selected as follows.

•Time measurement cursor (vertical)

T1 Moves cursor T1 only. T2 Moves cursor T2 only. T1&T2 Moves both cursors T1 and T2 simultaneously without changing the distance

between them.

•Voltage measurement cursor (horizontal)

H1 Moves cursor H1 only. H2 Moves cursor H2 only. H1&H2 Move both cursors H1 and H2 simultaneously without changing the distance

between them.

Cursor movement range

•Vertical cursor

Movement range : Each vertical cursor can be moved

500

to 1002 different positions from the left edge (–5.00 div) to the right edge (5.00 div) of the waveform display frame. One time position is used for the P-P value of the displayed waveform, and two points (maximum and minimum) are measured at this position.

The default setting : –2.50 div for T1, 2.50 div for T2

• Horizontal cursor

Movement range : Each horizontal cursor can be

moved to 401 different positions from the top (4.00 div) to the bottom (–4.00 div) of the waveform display frame.

The default setting : –2.00 div for H1, 2.00 div for H2

1001

Analyzing Waveforms

4.00 div

0.00 div

-4.00 div

Voltage measurement using vertical cursors

When two voltage data (maximum and minimum) are displayed at the same time axis position, moving a vertical cursor from left to right measures each datum in the order in which it was sampled.

Sampling data

Vertical axis

Time axis

The numbers indicate the order in which the measurements are performed.

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8.1 Measuring a V-T Waveform using Cursors

Points to note when performing cursor measurements

• The cursors and measured values will still be displayed even if a different menu is selected. However, the cursors cannot then be moved.

• Cursor-measured values will be cleared if the automated measurement function is turned ON. However, pressing the CURSOR key (when “Cursor” is set to “ON”) will display the cursor-measured values.

• If the GO/NO-GO “Mode” has been set to “ON” and the “GO/NOGO EXEC” soft key has been pressed, the cursor measurement function will not operate even if the CURSOR key is pressed. To operate the cursor measurement function, the GO/NO-GO “Mode” must be set to “OFF”.

• In case the type selection menu is set to “V-T”, and a measured voltage value is interpolation data, a “*” will be displayed with the measurement item.

• If measurement is not possible, “- - -” will be displayed.

• Cursor measurement is also possible for expanded waveforms. When switching the display to show the expanded waveform, the position of the cursor on the screen does not change. When both the pre-zoom and the expanded waveform are displayed, cursor measurement will be performed on the expanded waveform.

• There might be cases where the displayed waveform is not in synchronization with the measurement values. To synchronize, stop data acquistion.

• When using waveform computations, the displayed unit will become “div” for waveforms obtained by addition/subtraction, and “V2” for waveforms obtained by multiplication.

• In case engineering units have been set by the linear scaling function, the first three characters of the unit setting will appear on the screen.

•Time is measured based on the T/div value set for the input signal waveform. Thus, be careful if the T/div set for a loaded or recalled waveform does not match the T/div for the input signal waveform.

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8.2 Measuring an X-Y Waveform using Cursors

Keys and Procedure

Rotary knob

Soft keys

CURSOR key

<, > keys

1. Display both the T-Y and the X-Y waveform in the same display.

2. Press the CURSOR key to display the cursor measurement setting

menu.

3. Press the “Cursor” soft key and select “ON”.

4. Press the “Type” soft key to display the measurement type selection

menu.

Measuring time difference/ voltage using the X-Y cursors

5. Press the “X-Y” soft key. The X-Y cursors will appear on the screen.

6. Use the rotary knob to adjust the position of the X-Y cursor.

Measuring only voltage difference on the X axis using the vertical cursors

5. After step 4 has been completed, press the “dX” soft key to display the

cursor setting menu. The vertical cursors will appear on the screen.

Analyzing Waveforms

Explanation

6. After having pressed any of the “T1”, “T2” or “T1&T2” soft keys, use the rotary knob to adjust the position of the cursor.

Measuring only voltage difference on the Y axis using the horizontal cursors

5. After step 4 has been completed, press the “dY” soft key to display the

cursor setting menu. The horizontal cursors will appear on the screen.

6. After having pressed any of the “H1”, “H2” or “H1&H2” soft keys, use the rotary knob to adjust the position of the cursor.

Channel assignment for the X-Y axis X-axis Input voltage of CH1 Y-axis Input voltage of CH2

Waveforms which cannot be measured

For waveforms which cannot be measured, refer to page 8-2.

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8.2 Measuring an X-Y Waveform using Cursors

Measurement items

The following items can be measured.

• Using X-Y cursors to measure time difference/ voltage : X-Y

T Time difference between position of vertical cursor and trigger position (the vertical

cursor is also displayed on the T-Y waveform in case the T-Y and X-Y waveform are being displayed on the same screen)

X X-axis voltage at the position of the X-Y cursor (Voltage at the position where

waveform CH1 intersects the vertical cursor of the T-Y waveform)

Y Y-axis voltage at the position of the X-Y cursor (Voltage at the position where

waveform CH2 intersects the vertical cursor of the T-Y waveform)

T-Y waveform

Measurement values

Vertical cursor

X-Y waveform

X-Y cursor

• Using vertical cursors to measure only voltage difference of the X-axis : dX

DX V2-V1; where V1 is the voltage at the X-axis where cursor T1 intersects, and V2 is

the voltage at the X-axis where cursor T2 intersects.

• Using horizontal cursors to measure only voltage difference of the Y-axis : dY

DY V2-V1; where V1 is the voltage at the Y-axis where cursor H1 intersects, and V2 is

the voltage at the Y-axis where cursor H2 intersects.

Cursor movement method

The cursors can be selected as follows.

• X-Y cursor

The X-Y cursor is indicated by a “+” symbol and moves over the X-Y waveform. In case the display shows both the X-Y and the T-Y waveform, there will be only one vertical cursor displayed, on the T-Y waveform. This cursor, related to the X-Y cursor, moves over the time-axis.

•Vertical cursor

T1 Moves cursor T1 only. T2 Moves cursor T2 only. T1&T2 Moves both cursors T1 and T2 simultaneously without changing the distance

between them.

• Horizontal cursor

H1 Moves cursor H1 only. H2 Moves cursor H2 only. H1&H2 Moves both cursors H1 and H2 simultaneously without changing the distance

between them.

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Cursor movement range

The X-Y cursor can only be moved over the X-Y waveform. For details regarding the horizontal/vertical cursors, refer to page 8-3.

Points to note when performing cursor measurements

For more details regarding the points to note when performing cursor measurements, refer to page 8-3.

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8.3 Measuring Waveform Parameters Automatically

Relevant Keys

Operating Procedure

1. Press the MEASURE key to display the automated measurement setting menu.

2. Press the “Measure” soft key and select “ON”.

You can perform measurement both on displayed waveform data and on the corresponding waveform values within acquisition memory. You first set the various conditions (measurement range, measurement items, distal/proximal values, and channel delay). You can then start measurement of the displayed waveform data by pressing the “Measure” soft key so that it comes ON. DL1520, DL1520L, DL1540L,or DL1540 with a software (ROM) version of 1.13 or later, are able to measure the actual (memory-resident) values. You must first stop waveform acquisition, then you can execute the measurement by pressing the “ALL Scan EXEC” soft key. Each press of the key takes a single measurement of the various waveform parameters, using the memory-resident values corresponding to the displayed waveform data. The measurement conditions (range, items, distal/proximal values, and channel delay) are the same as those for the displayed data.

Rotary knob

SELECT key

RESET key

ESC key

Soft keys

MEASURE key

<, > keys

Analyzing Waveforms

Setting the measurement range

The measurement range is determined by the two vertical cursors T1 and T2. The position of cursor T1 indicates the starting point of measurement, and the position of cursor T2 indicates the end point.

3. After having pressed either the “T1”, or “T2” soft keys, use the rotary knob to adjust the position of the cursor. You can also use the < or > keys.

T1 cursor T2 cursor

Measurement range

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8.3 Measuring Waveform Parameters Automatically

Selecting the measurement items

The measurement items can be selected from 20 different ones. For the meaning of each item, refer to the description on page 8-11.

4. Press the “Measure” soft key at the automated measurement setting menu to display the item selection menu.

5. Press the soft key corresponding to the desired trace or loaded waveform number. For DL1520/DL1520L, menus such as “TRACE1”, “TRACE2”, “MATH”, “LOAD1” and “LOAD2” are displayed instead of the trace/load waveform selection menu shown below.

6. Use the rotary knob to highlight the desired measurement item.

7. Press the SELECT key to select an item. The selection mark in front of the item will be

highlighted to indicate it has been selected. Press the SELECT key again to undo this, or to reset all selection at once, press the “ALL CLEAR” soft key.

8. Repeat step 6 and 7 to select all the desired measurement items. The display of the measurement items depends on the number of waveforms to be measured and the selected items. Refer to page 8-13 for more details.

When selected, the mark becomes .

Use the rotary knob to first highlight an item, and then (de)select it.

Switches between menus For DL1520/DL1520L, another menu is displayed.

Setting the distal/proximal values

The two levels which are used as the reference for the measurement of rise and fall times can be set. For more details, refer to the description on page 8-11.

9. Use the rotary knob to select either the “PROX” or “DISTAL” setting and press the SELECT key to display the value setting box.

10. Use the rotary knob to set the desired value. Press the RESET key to restore the new

value to the default value.

11. Press the SELECT key or the ESC key to close the value setting box.

12. Repeat steps 9 to 11 to set either the “PROX” or “DISTAL” settings.

Value setting box; set the value using the rotary knob.

13. Repeat steps 5 to 12 in case you want to select measurement items for another trace or loaded waveform. In case you want to select the same measurement items for all traces and loaded waveforms, select “Copy To All Trace” using the rotary knob and press the SELECT key.

Returning to the top menu

14. Press the “To Topmenu” soft key or the ESC key to return to the automated

measurement setting menu.

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8.3 Measuring Waveform Parameters Automatically

Setting delay measurement between channels

The delay between channels is the time difference of the rising or falling edge between traces or loaded waveforms. For each trace and loaded waveform, the waveform to be used as a reference and the measurement waveform need to be specified.

Setting the measurement waveform

15. Press the “Delay Setup” soft key at the automated measurement setting menu to

display the delay selection menu.

16. Press the soft key corresponding to the desired trace or loaded waveform number which

will be subjected to measurement.

17. After having selected “Mode” using the rotary knob, press the SELECT key to select

“ON”. Pressing the SELECT key once more will result in selecting “OFF”.

18. After having selected “Edge Polarity” of the “Measure” setting using the rotary

knob, press the SELECT key to select rising edge or falling edge.

19. After having selected “Edge Count” of the “Measure” setting using the rotary knob,

press the SELECT key to display the count setting box.

20. Use the rotary knob to set the desired count number. Press the RESET key to restore

the new value to the default value.

21. Press the SELECT key or the ESC key to close the count setting box.

22. After having selected “Threshold” of the “Measure” setting using the rotary knob,

press the SELECT key to set the delay detection level to “Volts” or “%”.

23. Use the rotary knob to select the screen below and press the SELECT key to display

the value setting box.

24. Use the rotary knob to set the desired value. Press the RESET key to restore the new

value to the default value.

25. Press the SELECT key or the ESC key to close the value setting box.

Setting the reference waveform

26. After steps 17 to 25 have been completed, and after having selected “Trace” of the

“Reference” setting using the rotary knob, press the SELECT key to select the trace or loaded waveform to be used as reference.

27. After having selected “Edge Polarity” of the “Reference” setting using the rotary

knob, press the SELECT key to select rising edge or falling edge.

28. After having selected “Edge Count” of the “Reference” setting using the rotary

knob, press the SELECT key to display the count setting box.

29. Use the rotary knob to set the desired count number. Press the RESET key to restore

the new value to the default value.

30. Press the SELECT key or the ESC key to close the count setting box.

31. After having selected “Threshold” of the “Reference” setting using the rotary knob,

press the SELECT key to set the delay detection level to “Volts” or “%”.

32. Use the rotary knob to select the screen below and press the SELECT key to display

the value setting box.

33. Use the rotary knob to set the desired value. Press the RESET key to restore the new

value to the default value.

34. Press the SELECT key or the ESC key to close the value setting box.

35. Repeat steps 16 to 34 in case you want to set delay measurement for other trace or

loaded waveforms.

Analyzing Waveforms

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Returning to the top menu

36. Press the “To Topmenu” soft key or the ESC key to return to the automated

measurement setting menu.

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8.3 Measuring Waveform Parameters Automatically

Measurement range

Select ON when delay measurement is to be done.

Set the measurement conditions.

Selects the waveform of reference. For DL1520/DL1520L, TRACE1/TRACE2/MATH/LOAD1 /LOAD2 are displayed.

Sets the measurement conditions of the reference channel.

Switches between menus For DL1520/DL1520L, another menu is displayed.

Reference waveform

Measurement waveform

Ground level

1 count

N1 count

100％

60％

Delay between channels

N2 count

Setting example

･Edge Polarity ･Edge Count ･Threshold Level

Setting example of measurement waveform

･Edge Polarity ･Edge Count ･Threshold Level

: (rising) : N1(1 to 9) : 60％

: (falling) : N2(1 to 9) : 5V



Measuring data in acquisition memory (applicable to DL1540 with a software (ROM) version of 1.13 or later - refer to section 14.3, DL1520, DL1520L or DL1540L)

1. Set the measurement range, measurement items, distal/proximal values, and channel

delay to appropriate values. Then confirm that the “Measure” soft key in the automated measurement setting menu (top menu) is set to “ON”.

•To execute measurement of memory data

2. Press the START/STOP key to halt waveform acquisition.

3. Press the “ALL Scan EXEC” soft key. The key name immediately changes to “ALL Scan ABORT” and the oscilloscope begins executing a single measurement of the

relevant data in memory, while displaying progress on the screen. When measurement is finished the key name changes back to “ALL Scan EXEC”.

8-10

Indicates progress of acquisition-memory data measurement.

•To abort measurement of memory data

4. The “ALL Scan ABORT” soft key remains on the screen while measurement is being

carried out. You can abort the measurement at any time by pressing this key. (The key name will immediately change back to “ALL Scan EXEC”).

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Explanation

+ WIDTH - WIDTH

PERIOD

Distal line (90%)

Mesial line (50%)

Proximal line (10%)

RISE

FALL

HIGH (100%)

LOW(0%)

RISE

(Rise)*

FALL

(Fall)*

FREQ

(Freq)*

PERIOD

(Prod)*

: Rise time [s]

: Fall time [s]

: Frequency [Hz],1/PERIOD

: Period [s]

+ WIDTH

( + Wd)*

- WIDTH

( - Wd)*

DUTY

(Duty)*

: Width (s) greater than the mesial value

: Width (s) smaller than the mesial value

: Duty ratio + WITHDTH/PERIOD x 100[%]

*( ) shows the corresponding neme at the measurement item setting screen.

8.3 Measuring Waveform Parameters Automatically

Waveforms which cannot be measured

For waveforms which cannot be measured, refer to page 8-2.

Setting the measurement range : Time range

The measurement range is determined at the displayed time axis by the two vertical cursors T1 and T2. The position of cursor T1 indicates the starting point of measurement, and the position of cursor T2 indicates the end point. Automatic measurements will be carried on data within this range. The default measurement range is 10div (time axis).

Measurement items : Item Setup

Measurement items can be selected from 20 different types. Items can be selected separately for each related waveform. The default is no items selected. A maximum of 24 items can be displayed at once on the waveform display. This also includes the values of delay measurement. The method of displaying the measurement values depends on the number of selected traces or loaded waveforms. Refer to page 8-13 for more details. The items which can be selected are as follows.

• Measurement items related to the voltage axis

When measuring items such as rise time and fall time, “High” represents the voltage for the most frequently occurring high amplitude (at 100% level), while “Low” represents the voltage for the most frequently occurring low amplitude (at 0% level). They are therefore different from “Max” and “Min”, which just represent the maximum and minimum voltage respectively.

P-P

: Peak to peak value (MAX - MIN) [V

(P-P)*

MAX

Maximum voltage [V]

(Max)*

MIN

Minimum voltage [V]

(Min)*

RMS

Root mean square value

(Rms)*

(1/ n )(∑(xi)2)

AVG

Average voltage (1/n)∑xi [V]

(Avg)*

1/2

[V]

]

UNDERSHOOT

( - Ovr)*

OVERSHOOT

( + Ovr)*

HIGH

(High)*

LOW

(Low)*

*( ) shows the corresponding name at the measurement item setting screen.

: Undershoot value

(LOW - MIN)/(HIGH - LOW) x 100 [%

: Overshoot value

(MAX - HIGH)/(HIGH - LOW) x 100[%

High level voltage [V]

Low level voltage [V]

]

Analyzing Waveforms

OVERSHOOT

UNDERSHOOT

• Measurement items related to the time axis

P-P

MAX

MIN

HIGH

LOW

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8.3 Measuring Waveform Parameters Automatically

• Other Measurement items

INTEG1TY(I1TY) Area of positive amplitude INTEG2TY(I2TY) Area of positive amplitude - Area of negative amplitude INTEG1XY(I1XY) Total sum of the triangular areas of the X-Y waveform INTEG2XY(I2XY) Total sum of the trapezoid areas of the X-Y waveform

Note

For a detailed description of the area calculation method, refer to Appendix 4.

The “Prox” setting ranges from 0 to 49, in 1 % steps. The “Distal” setting ranges from 50 to 100, in 1 % steps.

Delay between channels : Delay Setup

The delay between channels is the time difference of the rising or falling edge between traces or loaded waveforms. For the relation between the channel of measurement and the reference channel, refer to page 8-10. Measurement starts when the “Mode” setting is set “ON”. The default setting is “OFF”. The trigger slope can be either “ default setting is “ Count” setting, and can be set from 1 to 9. The default setting is “1”. The voltage level at which triggering occurs is set at the “Threshold Level” setting, and can be selected from “Volts” or “%”. The default setting is “0.0000 V”. This volts setting range is the voltage value corresponding to ± 8 div. The setting step is 0.04 div. % can be set to a percentage of 0 to 100 %, where 100 % corresponds to the amplitude of “HIGH - LOW”. The setting step is 1 %. The measurement values will be displayed as “Dly”.

”. The number of times the trigger is activated is set at the “Edge

” or “ ” and is selected at the “Edge Polarity” setting. The

Points to note relating to automated measurement

• The cursors and measured values will still be displayed even if a different menu is

selected. However, the cursors cannot then be moved.

• Values gathered by the automated measurement function will be cleared if the cursor

measurement function is turned ON. However, pressing the MEASURE key (when “Measure” is set to “ON”) will display the automatically measured values.

• If the GO/NO-GO “Mode” has been set to “ON” and the “GO/NOGO EXEC” soft key

has been pressed, the automated measurement function will not operate even if the MEASURE key is pressed. To operate the automated measurement function, the GO/NOGO “Mode” must be set to “OFF”.

• If measurement is not possible, “- - -” will be displayed.

• If two or more periods of the waveform lie within the measuring range, the first period

will be measured.

• Automated measurement is also possible for expanded waveforms. When switching the

display to show the expanded waveform, the position of the cursor on the screen does not change. When both the pre-zoom and the expanded waveform are displayed, automated measurement will be performed on the expanded waveform.

• Automated measurement is not synchronized with the update of the displayed waveform.

Hence, the displayed waveform may not match the measured values. To make the displayed waveform match the automatic measurements, stop acquisition.

• When using waveform computations, the displayed unit will become “div” for

waveforms obtained by addition/subtraction, and “V2” for waveforms obtained by multiplication.

•Time is measured based on the T/div value set for the input signal waveform. Thus, be

careful if the T/div set for a loaded or recalled waveform does not match the T/div for the input signal waveform.

• Only the measurement items INTEG1XY and INTEG2XY can be displayed in case of the

X-Y display and T-Y & X-Y display.

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8.3 Measuring Waveform Parameters Automatically

Display Example of measurement values

The number and type of measurement items which can be displayed at a screen together with the waveform(s) depend on the number of waveforms under measurement. Furthermore, if the number of measurement items exceeds the maximum which can be displayed, the type of measurement items which will appear on the display is designated. The following shows an example where the type of displayed measurement values is designated.

• In case of one waveform under measurement

Measurement values of selected measurement items and delay between channels will all be displayed.

• In case of two waveforms under measurement

Up to 12 measurement values of selected measurement items of one waveform will be displayed. In case delay measurement is set “ON”, the maximum number of displayed measurement items becomes 11.

• In case of three or four waveforms under measurement

Up to 6 measurement values of selected measurement items of one waveform will be displayed. In case delay measurement is set “ON”, the maximum number of displayed measurement items becomes 5.

• In case of more than five waveforms under measurement

Up to 3 measurement values of selected measurement items of one waveform will be displayed. In case delay measurement is set “ON”, the maximum number of displayed measurement items becomes 2.

Analyzing Waveforms

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* MISC: Use of the Information menu or communications function enables output of all the

selected measured values, though the measured values cannot be updated by the Information menu. When saving screen image data on a floppy disk in HP-GL or PostScript format, all the selected items can be saved.

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8.4 Using the Linear Scaling Function

Relevant Keys

Operating Procedure

1. Press the MISC key to display the setting menu and press the “To NextMenu” soft

2. Press the “Scale” soft key.

3. Press the “Mode” soft key and select “ON”. The “Setup” soft key will appear.

Rotary knob

SELECT key

RESET key

ESC key

Soft keys

MISC key

<, > keys

key.

4. Press the “Setup” soft key to display the linear scaling setting menu.

In order to use the linear scaling function, it is necessary to select the waveform of measurement, to set the coefficient A and the offset value B, and to apply a unit.

Selecting the waveform of measurement

5. Use the rotary knob to select the desired waveform of measurement.

6. Press the SELECT key to turn the “Mode” setting “ON”. Pressing the SELECT key

once more will result in selecting “OFF”. For DL1520/DL1520L, menus such as “CH1”, “CH2”, “MATH”, “LOAD1” and “LOAD2” are displayed instead of the linear scaling setting menu shown below.

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8.4 Using the Linear Scaling Function

Setting the scaling coefficient A and the offset value B

7. Use the rotary knob to select the coefficient A of the measurement waveform and press

the SHIFT + MISC (KEYBOARD) key to display the keyboard.

8. Use the keyboard to enter the desired value. For details concerning operation of the

keyboard, refer to page 4-8.

9. Use the rotary knob to select the coefficient B of the measurement waveform and press

the SHIFT + MISC (KEYBOARD) key to display the keyboard.

10. Use the keyboard to enter the desired value. For details concerning operation of the

keyboard, refer to page 4-8.

Applying a unit

11. Use the rotary knob to select the “UNIT” setting and press the SELECT key to display

the keyboard.

12. Use the keyboard to enter desired unit. The unit will appear at the “units” setting on the

screen. For details regarding the usage of the keyboard, refer to page 4-8.

13. Repeat steps 5 to 12 in case you want to set the linear scaling function for other

waveforms.

Returning to the top menu

14. Press the ESC key to close the linear scaling setting menu.

15. Press the “To Topmenu” soft key to return to the MISC menu.

Explanation

Waveforms which cannot be measured

For waveforms which cannot be measured, refer to page 8-2.

Setting the coefficient A and offset value B

If the setting range of A, B is within –3.4E38≤AX + B≤3.4E38*, the results will be displayed. If the setting exceed this range, the display will show “- - -”. For an example, refer to the next page. The default setting is 0.000000E+00*.

* 1E38 represents 1x1038.

Setting the unit

This setting is useful to enter any unit. Up to eight characters can be input. Note however, that only the first three characters will appear on the display.

Display Example of linear scaling results

The results of linear scaling will not appear on the display until data acquisition has been started. The scaling coefficient A, offset B, and new defined unit will be applied to measurement values of cursor measurements and automated measurements. The following is a display example of the results of automated measurement.

• When linear scaling is ON

• When linear scaling is OFF

Analyzing Waveforms

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8.5 Performing Waveform Math (Addition, Subtraction and Multiplication)

Keys and Procedure

Rotary knob

Soft keys

MATH key

1. Press the MATH key to display the waveform math setting menu. For DL1520, “Knob” menu for trace MATH which displays computation result is also displayed.

Selecting the type of computation

2. Press the soft key corresponding to the math to be carried out.

Performing a phase shift

3. For DL1540/DL1540L, in case of computation of multiplication, press

the “Phase” soft key. For DL1520/DL1520L, open the “Knob” menu first, then press the “Phase” soft key.

4. Turn the rotary knob to shift the phase. For DL1540/DL1540L, step 3 is not required if a MATH function other than multiplication is selected.

Changing the display sensitivity of the computation result of multiplication

3. After step 2 has been completed, press the “SENS” soft key.

4. Turn the rotary knob to adjust the sensitivity.

Explanation

* For DL1520/DL1520L, the “POSITION” menu of the Knob menu

can be used to move the vertical position (trace MATH) in steps of

0.02 div.

Types of computation

The following types can be selected. The default value is “OFF”. OFF computation will not be carried out;

→→

1+2(

→3) The result of adding waveform data of CH1 and CH2 will be displayed as trace 3

→→

(or MATH).

→→

1–2(

→3) The result of subtracting waveform data of CH1 and CH2 will be displayed as

→→

trace 3 (or MATH).

→→

1x2(

→3) The result of multiplying waveform data of CH1 and CH2 will be displayed as

→→

trace 3 (or MATH).

Phase shift

Math can be performed with the phase of CH2 shifted. The setting range and steps are as follows. Setting range : ±5div Setting steps : depending on the display record length. Refer to page 7-4 for more details.

Changing the display sensitivity of the computation result of multiplication

In order to observe the computation result better, the waveform size from the ground level (display sensitivity) can be changed. The display sensitivity of the computation result of multiplication is specified as follows. Waveform size (from the ground level) of the computation result: Z=(SENS/2) x (XxY/2)

SENS set value using rotary knob (div) X waveform size of channel 1 (compared to ground level) Y waveform size of channel 2 (compared to ground level)

Setting ranges from 0.50 to 4.00 div. Setting step is 0.01 div.

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8.5 Performing Waveform Math (Addition, Subtraction and Multiplication)

Points to note relating to waveform computation

• Computation cannot be carried out on snapshot waveforms or recalled waveforms.

• Computation between channels is carried out using the original acquisition data which are then displayed using P-P compression. In case the input coupling is AC and an offset voltage is applied, the offset part will not be included in computation.

• Addition and subtraction computation is carried out regardless of the V/DIV setting of the channels. Therefore, in case of cursor measurement or automated measurement of trace 3 (or MATH), the displayed unit will become “div”.

• The voltage axis sensitivity of channel 1 and 2 being V1 and V2 respectively, the voltage axis sensitivity of the computation result becomes (4/SENS) x V1 x V2/div. Therefore, in case of cursor measurement or automated measurement of trace 3 (or MATH), the displayed unit will become “V

”.

• The computed waveform displayed on trace 3 (or MATH) is P-P compressed data. When this data is stored or saved on the internal memory/floppy disk/SCSI device, information indicating that this is a computed waveform and the voltage axis information after the computation are not stored or saved. Therefore, if this data is recalled or loaded and then a measurement is made using the cursors or automated measurement of waveform parameters, correct values will not be displayed. To display the correct values, save the waveform data on CH1 and CH2 from the acquisition memory to the floppy disk/SCSI device as binary data. Then, load the data and redo the waveform computation. Waveform data in the acquisition memory cannot be stored in the internal memory.

• If the computed result due to adding or subtracting is larger than 10.24 div or the result due to multiplying is larger than 13 div, a chopped waveform will be displayed as in the following diagram. This is due to the fact that the computed result exceeds the display range.

Analyzing Waveforms

• Even if "OFF" is selected at the waveform math setting menu, the phase shift function is still effective. To disable the phase shift function, set the phase shift to 0 div.

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YOKOGAWA DL 1540, DL 1520, DL 1540L, DL 1520L User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual