Rigol DS1302CA, DS1202CA, DS1102CA, DS1062CA User guide

User’s Guide RIGOL

Publication number DS1000CA-080512 April 2008

DS1000CA Series Digital Oscilloscopes

DS1302CA, DS1202CA, DS1102CA, DS1062CA

RIGOL

z Copyright ©1998-2008 RIGOL Technologies, Inc. All Rights Reserved. z RIGOL products are protected by patent law in and outside of P.R. China. z Information in this publication replaces all previously corresponding material. z RIGOL Technologies, Inc. reserves the right to modify or change part of or all

the specifications and pricing policies at company’s sole decision.

NOTE:

RIGOL

is registered trademark of

RIGOL

Technologies, Inc.

User’s Guide for DS1000CA Series

I

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Safety Notices

Review the following safety precautions carefully before operating the instrument to avoid any personal injuries or damages to the instrument and any products connected to it.

To avoid potential hazards use the instrument as specified by this user’s guide only.

The instrument should be serviced by qualified personnel only.

To Avoid Fire or Personal Injury.

Use Proper Power Cord. Use the power cord designed for the instrument and

authorized in your country only.

Connect and Disconnect Accessories. Do not connect or disconnect probes or

test leads while they are connected to a voltage source

Ground The Instrument. The oscilloscope is grounded through the grounding

conductor of the power cord. To avoid electric shock the instrument grounding conductor(s) must be grounded properly, before making connections to the input or output terminals of the instrument.

Connect The Probe. The probes’ ground terminals are at the same voltage level of

the instrument ground. Do not connect the ground terminals to a high voltage.

Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings

and marks on the instrument. Follow the user’s guide for further ratings information before making connections to the instrument.

Do Not Operate Without Covers. Do not operate the instrument with covers or

panels removed.

User’s Guide for DS1000CA Series

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Use Proper Fuse. Use the fuse of the type, voltage and current ratings as specified

for the instrument.

Avoid Circuit or Wire Exposure. Do not touch exposed connections and

components when power is on.

Do Not Operate With Suspected Failures. If suspected damage occurs with the

instrument, have it inspected by qualified service personnel before further operations.

Provide Proper Ventilation. Refer to the installation instructions for proper

ventilation of the instrument.

Do not Operate in Wet/Damp Conditions.

Do not Operate in an Explosive Atmosphere.

Keep Product Surfaces Clean and Dry.

The disturbance test of all the models meet the limit values of A in the standard of EN 61326: 1997+A1+A2+A3, but can’t meet the limit values of B.

Measurement Category

The DS1000CA series Digital Oscilloscope is intended to be used for measurements in

Measurement Category I.

Measurement Category Definitions

Measurement Category I is for measurements performed on circuits not directly

connected to MAINS. Examples are measurements on circuits not derived from MAINS,

and specially protected (internal) MAINS derived circuits. In the latter case, transient

stresses are variable; for that reason, the transient withstand capability of the

equipment is made known to the user.

User’s Guide for DS1000CA Series

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WARNING

IEC Measurement Category I. The input terminals may be connected to circuit terminal in IEC Category I installations for voltages up to 300 VAC. To avoid the danger of electric shock, do not connect the inputs to circuit’s voltages above 300 VAC. Transient overvoltage is also present on circuits that are isolated from mains. The DS1000CA series Digital Oscilloscopes is designed to safely withstand occasional transient overvoltage up to 500 Vpk. Do not use this equipment to measure circuits where transient overvoltage could exceed this level.

Safety Terms and Symbols

Terms in This Guide. These terms may appear in this guide:

!

Terms on the Product: These terms may appear on the product.

DANGER indicates an injury hazard may be immediately accessible.

WARNING indicates an injury hazard may be not immediately accessible.

CAUTION indicates that a potential damage to the instrument or other property

might occur.

Symbols on the Product: These symbols may appear on the Instrument:

Hazardous Voltage

WARNING: Warning statements identify conditions or practices that could result in injury or loss of life.

CAUTION: Caution statements identify conditions or practices that could result in damage to this product or other property.

!

Refer to Instructions

Protective Earth Terminal

Grounding Terminal of Chassis

Test Grounding Terminal

User’s Guide for DS1000CA Series

V

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General-Purpose Oscilloscopes

RIGOL DS1000CA-Series digital oscilloscopes offer exceptional waveform

viewing and measurements in a compact, lightweight package. The DS1000CA series is ideal for production test, field service, research, design, education and training involving applications of analog circuit tests and troubleshooting.

Product features: z Dual Channel, Bandwidth:

300MHz (DS1302CA) 200MHz (DS1202CA) 100MHz (DS1102CA 60MHz (DS1062CA)

z Color TFT LCD, 320×234 pixels resolution. z USB storage and printing supports, firmware upgrade via USB interface. z Adjustable waveform intensity, more effective waveform viewing. z One-touch automatic setup, ease of use (AUTO). z 10 Waveforms, 10 setups, supports CSV and bitmap format. z Delayed Scan Function, easy to give attention to both details and overview of a

waveform.

z 20 Automatic measurements. z Automatic cursor tracking measurements. z Waveform recorder, record and replay dynamic waveforms. z User selectable fast offset calibration. z Built-in FFT function, Frequency Counter. z D ig i t a l f il t e r s , i n c l u d e s L P F, H P F, B P F, B RF. z Pass/Fail Function, optically isolated Pass/Fail output. z Add, Subtract and Multiply Mathematic Functions. z Advanced trigger types include: Edge, Video, Pulse width, Slope, Alternative. z Adjustable trigger sensitivity. z Multiple Language User Interface. z Pop-up menu makes it easy to read and easy to use. z Built-in Chinese and English help system. z Easy-to-use file system supports Chinese & English characters file name input.

User’s Guide for DS1000CA Series

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Content

Safety Notices .............................................................................................. II

General-Purpose Oscilloscopes........................................................................ V

CHAPTER 1: GETTING STARTED ..................................................................... 1-1

The Front Panel and the User Interface ........................................................ 1-2

To Inspect the Instrument .......................................................................... 1-6

To Perform a Functional Check .................................................................... 1-7

To Compensate Probes ............................................................................... 1-9

To Display a Signal Automatically ............................................................... 1-10

To Set Up the Vertical Window .................................................................. 1-11

To Set Up the Horizontal System ............................................................... 1-13

To Trigger the Oscilloscope ....................................................................... 1-15

CHAPTER 2: OPERATING YOUR OSCILLOSCOPE ............................................... 2-1

Understand the Vertical System ................................................................... 2-2

Understand the Horizontal System ............................................................. 2-25

Understand the Trigger System ................................................................. 2-31

To Set Up the Sampling System ................................................................. 2-49

To Set Up the Display System .................................................................... 2-53

To Store and Recall Waveforms or Setups .................................................. 2-56

To Set Up the Utility ................................................................................. 2-64

To Measure Automatically ......................................................................... 2-83

To Measure with Cursors ........................................................................... 2-90

To Use Run Control Buttons ...................................................................... 2-96

CHAPTER 3: APPLICATION & EXAMPLES .......................................................... 3-1

Example 1: Taking Simple Measurements ..................................................... 3-1

Example 2: View a Signal Delay Caused by a Circuit ...................................... 3-2

Example 3: Capture a Single-Shot Signal ...................................................... 3-3

Example 4: To Reduce the Random Noise on a Signal ................................... 3-4

Example 5: Making Cursor Measurements .................................................... 3-6

Example 6: The application of the X-Y operation ........................................... 3-8

Example 7: Triggering on a Video Signal ..................................................... 3-10

Example 8: FFT Cursor measurement ......................................................... 3-12

Example 9: Pass/Fail Test .......................................................................... 3-13

User’s Guide for DS1000CA Series

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CHAPTER 4: PROMPT MESSAGES & TROUBLESHOOTING ................................. 4-1

Prompted Messages ................................................................................... 4-1

Troubleshooting ......................................................................................... 4-3

CHAPTER 5: SPECIFICATIONS ........................................................................ 5-1

CHAPTER 6: APPENDIX .................................................................................. 6-1

Appendix A: Accessories ............................................................................. 6-1

Appendix B: Warranty ................................................................................. 6-2

Appendix C: Maintenance ........................................................................... 6-3

Appendix D: Contact RIGOL ........................................................................ 6-4

Index .............................................................................................................. i

User’s Guide for DS1000CA Series

VII

Chapter 1 : Getting Started

This chapter covers the following topics:

 The front panel and user interface

 To inspect the instrument

 To perform a functional check

 To compensate probes

 To display a signal automatically

 To set up the vertical system

 To set up the horizontal system

 To trigger the oscilloscope

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User’s Guide for DS1000CA Series

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The Front Panel and the User Interface

The first thing to do with a new oscilloscope is to know its front panel. This chapter helps to be familiar with the layout of the knobs and keys and how to use them. Read the chapter carefully before further operations.

Figure 1-1, Front Panel; the knobs are used most often and are similar to the knobs on other oscilloscopes. The buttons allow you to use some of the functions directly but also bring up soft button menus on the screen, which enable the access to many measurement features associated with advanced functions, mathematics, and reference or to run control features.

Figure 1-1

DS1000CA-Series Oscilloscope’s Front Panel

DS1000CA series oscilloscopes provide an easy-to-use user interface, the definitions of the buttons and the knobs are as follows:

Menu buttons: Associated with Measure, Cursor, Acquire, Display, Storage, and

Utility menus.

User’s Guide for DS1000CA Series

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Vertical buttons: Associated with CH1, CH2, MATH and REF menus, the OFF

button can set waveform or menu which currently active off.

Horizontal buttons: Associated with horizontal MENU. Trigger buttons: Associated with trigger MENU, instant action to set 50% trigger

level and FORCE trigger.

Action buttons: Include run control buttons for AUTO and RUN/STOP.

Function buttons: Five blue buttons from top to bottom on the right of the LCD

screen, which set choice of operations in the currently active menu.

Knobs: For the adjustment of vertical or horizontal

,

and trigger .

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Figure 1-2

Front Panel Controls

Notation definitions in this User’s Guide:

Throughout this manual, notation symbols of buttons and knobs are the same of those on front-panel.

z A box around the name of the key denotes MENU function buttons on

front-panel, such as Measure.

z ( ) denotes the multi-function knob .

z

denotes the two POSITION knobs.

denotes the two SCALE knobs.

denotes the LEVEL knob.

z The name with a drop shadow denotes the menu operating key, such as

WAVEFORM soft key in STORAGE menu.

User’s Guide for DS1000CA Series

y

Channel 1

Channel 2

Running status

Location of waveform window in memor

Figure 1-3

Display screen

Trigger point in memory

Trigger point in waveform window

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Menu

Waveform display window

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To Inspect the Instrument

After receiving a new DS1000CA series oscilloscope, please inspect the instrument as follows:

1. Inspect the shipping container for damage.

Keep the damaged shipping container or cushioning material until the contents of the shipment have been checked for completeness and the instrument has been checked mechanically and electrically.

2. Check the accessories.

Accessories supplied with the instrument are listed in "Accessories" in this guide. If the contents are incomplete or damaged notify the RIGOL Sales Representative.

3. Inspect the instrument.

In case there is any mechanical damage or defect, or the instrument does not operate properly or fails performance tests, notify the RIGOL Sales Representative.

If the shipping container is damaged, or the cushioning materials show signs of stress, notify the carrier as well as the RIGOL sales office. Keep the shipping materials for the carrier’s inspection.

RIGOL offices will arrange for repair or replacement at RIGOL’s option without waiting for claim settlement.

User’s Guide for DS1000CA Series

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To Perform a Functional Check

Perform this quick functional check to verify that the instrument is operating correctly.

1. Turn on the instrument.

¾ Use the power cord designed for the oscilloscope only.

¾ Use a power source that delivers 100 to 240 VAC

, 45Hz to 440Hz.

RMS

¾ Turn on the instruments, and wait until the display shows the waveform window.

¾ Push the Storage button, select Storage in the top menu box and push the

Factory menu box.

Power button

Storage button

Figure 1-4

Turn on the instrument

WARNNING:

!

To avoid electric shock, be sure the oscilloscope is properly grounded.

2．Input a signal to a channel of the oscilloscope ① Set the attenuation switch on the probe to 10X and connect the probe to Channel

1 on the oscilloscope. To d o t h is :

¾ Align the slot in the probe connector with the key on the CH 1 BNC connector.

¾ Push to connect, and twist to the right to lock the probe in place.

¾ Attach the probe tip and ground lead to the PROBE COMP connector.

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Probe compensator

Figure 1-5

Attach the probe

② Set the probe attenuation of the oscilloscope to 10X. To do this, push CH1→

Probe→10X.

Probe scale

Figure 1-6 Figure 1-7

Set the probe The CH1 menu

③ Push the AUTO button. Within a few seconds, a square wave will display

(approximately 1 kHz 3 V peak- to- peak).

④ Push the OFF button or push the CH1 button again to turn off Channel 1.

Push the CH2 button to turn on channel 2, repeat steps 2 and 3.

User’s Guide for DS1000CA Series

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To Compensate Probes

Perform this adjustment to match the characteristics of the probe and the channel input. This should be performed whenever attaching a probe to any input channel the first time.

1. From CH1 menu, set the Probe attenuation to 10X (press CH1→Probe→10X). Set the switch to 10X on the probe and connect it to CH1 of the oscilloscope. When using the probe hook-tip, inserting the tip onto the probe firmly to ensure a proper connection. Attach the probe tip to the Probe compensator connector and the reference lead to the ground pin, Select CH1, and then press AUTO.

2. Check the shape of the displayed waveform.

Over compensated Correctly Compensated Under Compensated

Figure 1-9

Figure 1-8

Check the shape

3. If necessary, use a non-metallic tool to adjust the trimmer capacitor of the probe

for the flattest square wave being displayed on the oscilloscope.

4. Repeat if necessary.

WARNNING: To avoid electric shock while using the probe, be sure the

!

perfection of the insulated cable, and do not touch the metallic portions of the probe head while it is connected with a voltage source.

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To Display a Signal Automatically

The oscilloscope has an automated feature to display the input signal best-fit. The input signal should be 50Hz or higher and a duty cycle is greater than 1%.

Press the AUTO button, the oscilloscope automatically sets up VERTICAL, HORIZONTAL and TRIGGER controls to display the input signal. Adjust the controls manually to get the best results if necessary.

Connect a signal to the Channel 1 (CH1).

1. Connect a signal to the oscilloscope as described above.

2. Press AUTO.

The oscilloscope may change the current settings to display the signal; adjusts the vertical and horizontal scaling, the trigger coupling, type, position, slope, level, and mode.

User’s Guide for DS1000CA Series

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To Set Up the Vertical Window

Figure 1-9 shows the VERTICAL controls, CH1, CH2, MATH, REF, and OFF buttons and vertical , knobs. Following the exercises in the buttons, knobs, and the status bar to be familiar with the vertical parameters settings.

Figure 1-9

The vertical window

1. Center the signal on the display with the

knob.

The turning the

knob moves the signal vertically, and it is calibrated. Note that

knob, a voltage value is displayed for a short time indicating its value with respect to the ground reference located at the center of the screen. Also notice that the ground symbol on the left side of the display moves in conjunction with the

knob.

Measurement hints

If the channel is DC coupled, measuring the DC component of the signal by simply noting its distance from the ground symbol.

If the channel is AC coupled, the DC component of the signal is blocked, allow you to use greater sensitivity to display the AC component of the signal.

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Vertical offset back to 0 shortcut key

Turn the channel and press the

knob to change the vertical display position of

knob to set the vertical display position back to 0 as a shortcut key, this is especially helpful when the trace position is far out of the screen and want it to get back to the screen center immediately.

2. Change the vertical setup and notice that each change affects the status bar differently.

z Change the vertical sensitivity with the

knob and notice the change

in the status bar.

z Press CH1 to turn on Channel 1. z A soft button menu appears on the display (or remains on if it was already

turned on).

z Toggle the soft buttons and notice the changes in the status bar. Channel 1 and

2 have a vernier soft button that allows the

knob to change the

vertical step size in smaller increments. To press Volts/Div soft button to change

the step size into Fine or Coarse status.

z Press OFF button to turn off the channel.

Coarse/Fine Shortcut key

The Coarse/Fine vertical control can be set by simply pressing the vertical

knob.

User’s Guide for DS1000CA Series

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To Set Up the Horizontal System

Figure 1-10 shows the HORIZONTAL controls: MENU button, and

knobs of horizontal system. Following the exercise to familiarize with the

buttons, knobs, and status bar.

Figure 1-10

The horizontal system

1. Turn the

knob and notice the change in the status bar.

The horizontal

knob changes the sweep speed in a 1-2-5 step sequence, and displays the value in the status bar. The time base ranges of the DS1000CA series is from 5ns/div* to 50s/div.

* NOTE: The speed of horizontal scan varies by different models.

Delayed Scan Shortcut key

To press the

knob in the horizontal control area on the front-panel

is another way to enter or exit Delayed Scan mode and it is equal to the menu

operations, MENU→Delayed→ON.

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2. The horizontal

knob moves displayed signal horizontally

on waveform window.

Horizontal offset back to 0 shortcut key

Press the

knob to set the horizontal offset to 0 as a shortcut key, this is especially helpful when the trigger point is far out of the screen and want it to get back to the screen center immediately.

3. Press the MENU key to display the TIME menu.

To enter or exit the Delayed Scan mode, set the display to Y-T, X-Y or ROLL mode, and turn the horizontal

knob to adjust trigger offset.

Horizontal position control

Trig-Offset: In this setting, the trigger position will be changed horizontally

when you turning the

knob.

User’s Guide for DS1000CA Series

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To Trigger the Oscilloscope

Figure 1-11 shows the trigger control: MENU, 50%, FORCE and a trigger level knob. Following the exercises to familiarize with the buttons, trigger level knob and status bar.

Figure 1-11

The trigger control window

1. Turn the trigger Level knob and notice the changes on the display.

On the DS1000CA series oscilloscopes, as you turn the

knob or pressing

the 50% button, two things will happen on the display for a short time.

¾ First, the trigger level value is displayed at the bottom-left of the screen. If the

trigger is DC coupled, it is displayed as a voltage value. If the trigger is AC coupled or LF reject, it is displayed as a percentage of the trigger range.

¾ Second, a line is displayed showing the location of the trigger level (as long as

AC coupling or low frequency reject are not selected).

Trigger Level to 0 Shortcut key

Turn the

knob to change the trigger level value and press the

knob to set trigger level back to 0 as a shortcut key.

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2. Change the trigger setup and notice these changes in the status bar.

Press MENU button in the Trigger control. A soft button menu appears on the display showing the trigger setting choices as shown in Figure 1-12.

· Press the trigger Mode button and choose Edge.

· Press the trigger Source button to select CH1.

· Press the trigger Slope button to choose .

· Press the trigger Sweep button to select Auto.

· Press the trigger Set Up button to enter secondary menu.

Figure 1-12

NOTE: The trigger mode, slope and source change in conjunction with the status bar

on the top-right of the screen.

3. Press 50%

The 50% button sets the trigger level to the center of the signal.

4. Press FORCE

Starts an acquisition regardless of an adequate trigger signal, usually used in “Normal” or “Single” trigger mode. This button has no effect if the acquisition is already stopped.

Key point:

Holdoff: A time interval before the oscilloscope response to next trigger signal. During this Holdoff period, the trigger system becomes “blind” to trigger signals. This function helps to view complex signals such as an AM

waveform. Press Holdoff button to activate (

) knob, then turn it to adjust

Holdoff time.

User’s Guide for DS1000CA Series

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Chapter 2 : Operating Your Oscilloscope

By now, a user should understand the VERTICAL, HORIZONTAL and TRIGGER control systems and knows how to determine the system setup from the status bar of a DS1000CA-series digital oscilloscope. This chapter will go through all groups of front-panel buttons, knobs and menus; and further the knowledge of the operation by hints in this guide. It is recommended to perform all of the following exercises to get the most of the powerful measurement capabilities of the oscilloscope.

 Understand the vertical system ( CH1, CH2, MATH, REF, OFF,

Vertical , Vertical )

 Understand the horizontal system (MENU, Horizontal

Horizontal )

 Understand the trigger system (

 To set up the sampling system (Acquire)

 To set up the display system (Display)

 To save and recall waveforms, CSV format, bmp format and other setups

(Storage)

 To set up utility (Utility)

 To measure automatically (Measure)

 To measure with cursors (Cursor)

 To use run control buttons (AUTO, RUN/STOP)

, MENU, 50%, FORCE)

,

User’s Guide for DS1000CA Series

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Understand the Vertical System

Ⅰ. Settings of the channels

Each channel of DS1000CA has an operation menu and it will pop up after pressing CH1 or CH2 button. The settings of all items in the menu are shown in the table below.

Figure 2-1 Table 2-1 The Channel menu (Page 1/2)

Menu Settings Comments

Block the DC component of the input Signal. Pass both AC and DC components of the input signal Disconnect the input signal.

Limit the channel bandwidth to 20MHz to reduce display noise. Get full bandwidth.

Set this to match the probe attenuation factor to make the

vertical scale readout correct.

Coupling

BW Limit

Probe

AC

DC

GND

ON

OFF

1X 5X 10X 50X 100X 500X 1000X

Digital filter Setup digital filter (See table 2-4).

Go to the next menu page (The

1/2

User’s Guide for DS1000CA Series

followings are the same, no more explanation).

Figure 2-2 Table 2-2 The Channel menu (Page 2/2)

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Menu

Settings Comments

Back to the previous menu page

2/2

(The followings are the same, no more explanation).

Select the resolution of the

knob. Define a 1-2-5 sequence. To change the resolution to small steps between the coarse settings.

Turn on the invert function. Restore to original display of the

Volts/Div

Invert

Coarse

Fine

ON OFF

waveform.

Unit

Input

V/ A/ W/ U

50Ω* 1MΩ

Set “V”, “A”, “W” or “U” as the unit of vertical channel.

Press this key to select the input resistance to 50Ω or 1MΩ.

For DS1202CA and DS1302CA only.

*

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1. Channel coupling

To use Channel 1 as an example, input a sine wave signal with DC shift.

Press CH1→Coupling→AC to set “AC” coupling. It will pass AC component blocks

the DC component of the input signal.

The waveform is displayed as Figure 2-3:

AC coupling setup

AC coupling status symbol

Figure 2-3

Waveform display

Press CH1→Coupling→DC, to set “DC” coupling. It will pass both AC and DC

components of the input signal.

The waveform is displayed as Figure 2-4:

User’s Guide for DS1000CA Series

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DC coupling setup

DC coupling status symbol

Figure 2-4

Waveform display

Press CH1→Coupling→GND, to set “GND” coupling, it disconnects the input signal.

The screen displays as Figure 2-5:

GND coupling

setup

GND coupling status symbol

Figure 2-5

Screen display

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2. Set up the channel bandwidth limit

Take Channel 1 for an example, input a signal containing high frequency component.

Press CH1 → BW Limit→OFF, to set up bandwidth limit to “OFF” status. The

oscilloscope is set to full bandwidth and passing the high frequency component in the signal.

The waveform is displayed as Figure 2-6:

Turn of f t h e BW limit

Figure 2-6

Turn off the BW limit

Press CH1→BW Limit→ON, to set up bandwidth limit to “ON” status. It will reject

the frequency component higher than 20MHz.

The waveform is displayed as Figure 2-7:

User’s Guide for DS1000CA Series

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20M BW limit

Mark of BW limit

Figure 2-7

Turn on the BW limit

User’s Guide for DS1000CA Series

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3. Probe Attenuation Setting

The oscilloscope allows selecting the attenuation factor for the probe. The attenuation factor changes the vertical scaling of the oscilloscope so that the measurement results reflect the actual voltage levels at the probe tip. To change (or check) the probe attenuation setting, press the CH1 or CH2 button

(according to which channel in using). Toggle the Probe soft button to match the

attenuation factor of the probe. This setting remains in effect until changed again.

Figure 2-8 show an example for using a 1000:1 probe and its attenuation factor.

Probe attenuation

Vertical volt/div.

Figure 2-8 Using a 1000:1 probe

Table 2-3 Probe setting

Probe attenuation factors Corresponding settings

1:1 1X

5:1 5X

10:1 10X

50:1 50X

100:1 100X

500:1 500X

1000:1 1000X

User’s Guide for DS1000CA Series

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g

4. Volts/Div settings

The Volts/Div control has Coarse or Fine configuration. The Vertical Sensitivity is

1mv/div - 10V/div.

Coarse: It is the default setting of Volts/Div in a 1-2-5-step sequence from 1mV/div,

2mV/div, 5mV/div, 10mV/div, to 10 V/div.

Fine: This setting changes the vertical scale to small steps between the coarse

settings. It will be helpful to adjust the waveform in smooth steps.

Fine adjustment

Fine adjustment data

Figure 2-9

Fine configurations

Coarse/Fine Shortcut key:

To change Coarse/Fine setting, not only by menu but also by pressin

knob.

User’s Guide for DS1000CA Series

vertical

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5. To invert a waveform

Invert turns the displayed waveform 180 degrees, as respect to the ground level. When the oscilloscope is triggered on the inverted signal, the trigger is also inverted.

Figure 2-10 and 2-11 show the changes before after the inversion respectively.

Invert off

Figure 2-10 The waveform before inversion

Invert on

Figure 2-11 The waveform after inversion

User’s Guide for DS1000CA Series

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Digital Filter:

Press CH1→Digital filter, display the digital filter menu. Turn ( ) knob to set high and low limit of frequency.

Turn off digital filter

Mark of digital filter

Figure 2-12

Turn off digital filter

Figure 2-13

Turn on digital filter

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Figure 2-14 Table 2-4 The Filter menu

Menu Settings Comments

Digital Filter

On Off

Turn on the digital filter. Turn off the digital filter.

Setup as LPF (Low Pass Filter). Setup as HPF (High Pass Filter).

Filter Type

Setup as BPF (Band Pass Filter). Setup as BRF (Band Reject Filter).

Upper limit

Lower limit

Turn (

) knob to set high limit.

) knob to set low limit.

Back to higher level menu (The followings are the same, no more explanation).

User’s Guide for DS1000CA Series

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Ⅱ. Math functions

The mathematic functions include “add”, “subtract”, “multiply” and “FFT” for Channel 1 and Channel 2. The mathematic result can be measured by the grid and the cursor.

MATH scale

Figure 2-15 The Math function

Figure 2-16 Table 2-5 The Math menu

Menu Settings Comments

A+B

Operation

A-B A×B FFT

Source A

Source B

Invert

CH1 CH2 CH1 CH2

ON OFF

Add source A and source B. Subtract source B from source A. Multiply source B by source A. Fast Fourier Transform.

Define CH1 or CH2 as source A.

Define CH1 or CH2 as source B.

Invert the MATH waveform. Restore to original waveform display.

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I. Using the FFT

The FFT (Fast Fourier Transform) process converts a time-domain signal into its frequency components mathematically. FFT waveforms are useful in the following applications:

z Measuring harmonic content and distortion in systems z Characterizing noise in DC power supplies z Analyzing vibration

Figure 2-17 Table 2-6 The FFT menu

Menu

Operate

Source

Settings Comments

A+B A-B A×B FFT

CH1 CH2

Add source A to source B. Subtract source B from source A. Multiply source B by source A. Fast Fourier Transform.

Define CH1 or CH2 as FFT source.

Rectangle

Window

Hanning Hamming

Select window for FFT.

Blackman

Display

Scale

Split Full screen

Vrms dBVrms

Display FFT waveform on half screen. Display FFT waveform on full screen.

Set “Vrms” as vertical unit. Set “dBVrms” as vertical unit.

Key points for FFT

1. Signals that have a DC component or offset can cause incorrect FFT waveform component magnitude values. To minimize the DC component, choose AC Coupling on the source signal.

2. To reduce random noise and aliases components in repetitive or single-shot events, set the oscilloscope acquisition mode to average.

3. To display FFT waveforms with a large dynamic range, use the dBVrms scale. The dBVrms scale displays component magnitudes using a log scale.

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Selecting an FFT Window

DS1000CA series oscilloscope provides four FFT windows. Each window is a trade-off between frequency resolution and amplitude accuracy. It depends on the desired measurement and the source signals characteristics to determine the window to use. Use the following guidelines to select the best window.

Table 2-7 FFT Windows

Window Features Best for measuring

Transients or bursts, the signal levels before and after the event are nearly equal. Equal-amplitude sine waves with fixed frequencies. Broadband random noise with a relatively slow varying spectrum.

Sine, periodic, and narrow-band random noise.

Transients or bursts where the signal levels before and after the events are significantly different.

Single frequency waveforms, to Find higher order harmonics.

Rectangle

Hanning Hamming

Blackman

Best frequency resolution and worst magnitude resolution. This is essentially the same as no window.

Better frequency, poorer magnitude accuracy than Rectangular. Hamming has slightly better frequency resolution than Hanning.

Best magnitude, worst frequency resolution.

Key points: FFT Resolution: The quotient between sampling rate and number of FFT

points. With a fixed FFT points, the lower sampling rate results in better resolution.

Nyquist Frequency

The highest frequency that any real-time digitizing oscilloscope can acquire without aliasing. It’s normally half of the sample rate. This frequency is called the Nyquist frequency. Frequency above the Nyquist frequency will be under

sampled, causing a situation known as aliasing.

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II. Using REF

Reference Waveforms are saved waveforms to be selected for display. The reference function will be available after saving the selected waveform to non-volatile memory.

Press REF button to display the Reference waveform menu.

Figure 2-18 Table 2-8 REF menu when using internal memory

Menu Settings Comments

Select channel1 as REF channel.

Select channel2 as REF channel.

Select Math/FFT as REF channel.

Source

CH1

CH2

MATH/FFT

Location

Save Save REF waveform

Imp./Exp.

Reset Reset REF waveform.

Figure 2-19 Table 2-9 REF menu when using external memory

Menu Settings Comments

Source

Location

Save

Import Go to import menu (see table 2-14).

Internal External

CH1

CH2

MATH/FFT

Internal External

Select memory location in scope. Select memory location out scope.

Go to import/export menu (see table 2-10).

Select channel1 as REF channel.

Select channel2 as REF channel.

Select Math/FFT as REF channel.

Select memory location in scope. Select memory location out scope.

Save REF waveform to outer memory location.

Reset Reset REF waveform.

User’s Guide for DS1000CA Series

Import and Export

Press REF →Imp. /Exp. and go to the following menu.

Figure 2-20 Table 2-10 The Imp. /Exp. menu

Menu Settings Comments

Path

Explorer

Export

Import Import the REF file to internal memory.

Directory File

Switch to Path, directory or file.

Export the REF file from internal memory to export memory (see table 2-11).

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Delete File

Delete file.

The screen of Import and Export as follows

Figure 2-21

Import of export the figure

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Export

Press REF→Imp. /Exp.→ Export and go to the following menu.

Figure 2-22 Table 2-11 The Export menu

Menu Settings Comments

Move the cursor up.

Move the cursor down.

To delete chosen letter.

Save Execute the operation.

The screen of Export as follows.

Figure 2-23 Figure export

User’s Guide for DS1000CA Series

Save to External Memory

Press REF→Save and go to the following menu.

Figure 2-24 Table 2-12 The Save menu

Menu Settings Comments

Explorer

New File (Folder)

Delete File (Folder)

The screen of Save as follows:

Path Directory File

Delete file (Folder).

Switch among Path, Directory and File.

Set up new file in Path and File. Set up new folder in directory.

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Figure 2-25 Save the figure

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New File (or New Folder)

Press REF→Save→New File (or New Folder) and go to the following menu.

Figure 2-26 Table 2-13 The New File menu

Menu Settings Comments

Move the cursor up.

Move the cursor down.

To delete chosen letter.

Save Execute the operation.

The screen of File Name input is as follows:

File name key in

Spell key in

Character window

Switch Chinese/English

Switch Capital on/off

Figure 2-27 File Name input

User’s Guide for DS1000CA Series

Import

Press REF→Import and go to the following menu.

Figure 2-28 Table 2-14 The Import menu

Menu Settings Comments

Path

Explorer

Directory File

Import

The screen of Import is as follows:

Switch among Path, Directory and File.

Import the REF file into internal memory.

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Figure 2-29

Figure import

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Display a Reference Waveform

Figure 2-30

Reference waveform display

1. Push REF button to show the reference waveform menu.

2. Press soft button 1 to select the reference channel: CH1, CH2, MATH, or FFT.

3. Turn vertical and vertical to adjust the REF waveform to a suitable position.

4. Press soft button No.2 to select the save location of REF waveform.

5. Press soft button No.3 to save the waveform as REF.

NOTE:

The Reference function is not available in X-Y mode.

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III. Turn on/off channels

CH1, CH2 and Ext. Trigger channels are input channels. All functions applied will base on operating the instrument with channels, so MATH and REF can be regarded as relatively isolated channels.

Press the corresponding button on the front panel to turn the channels on/off. The backlight indicates the channel is currently active. Press the button again to turn the channel off. When channel is currently selected, press OFF will turn it off and the backlight goes off.

Table 2-15 The Channels menu

Channel Mode Settings

ON

Channel 1 (CH1)

Selected OFF

ON

Channel 2 (CH2)

Selected OFF

ON

MATH

Selected OFF

Status Indicator

CH1 (black letter)

CH1 (yellow letter)

No indicator

CH2 (black letter)

CH2 (blue letter)

No indicator

Math (black letter)

Math (purple letter)

No indicator

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IV. Using Vertical and

Use the vertical controls to display signal waveforms by adjusting the vertical

, the and , and setting the input parameters.

1. Using vertical

The vertical

knob.

control changes the vertical position of signal waveforms in all channels (including MATH and REF). The resolution changes according to the vertical level set. Pressing this knob will clear the channel offset to zero.

2. Using vertical

The vertical

knob.

control changes the vertical sensitivity of signal waveforms in all channels (including MATH and REF). If the Volts/Div is set to “Coarse”, the waveform scales in a 1-2-5 step sequence from 2 mV to 10 V. If the Volts/Div is set to “Fine”, it scales to small steps between the coarse settings.

3. Channels would be adjustable by the vertical

and only

when they are selected.

4. During the vertical positioning, a position message is displayed on the left bottom of the screen, in the same color as the corresponding channel. The unit is V (Volts).

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Understand the Horizontal System

The oscilloscope shows the time per division in the scale readout. Since all active waveforms use the same time base, the oscilloscope only displays one value for all the active channels, except when using Delayed Scan, or Alternative Trigger.

The horizontal controls changes the horizontal scale and position of waveforms. The horizontal center of the screen is the time reference for waveforms. Changing the horizontal scale causes the waveform to expand or contract with respect to the screen center.

Horizontal position changes the displayed waveform position, relative to the trigger point.

The Horizontal Knobs

: The horizontal knob adjusts the horizontal position of

all channel (include Math) waveforms. The resolution of this control varies with the time base. Pressing this button clears trigger offset and moves the trigger point to the horizontal center of the screen.

: Use to select the horizontal time/div (scale factor) for the

main or the Delayed Scan time base. When Delayed Scan is enabled, it changes the width of the window zone by changing the Delayed Scan time base.

Horizontal Menu

Press the horizontal MENU button to display the horizontal menu. The settings of this menu are listed in the following table.

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Figure 2-31 Table 2-16 The Horizontal menu

Menu Settings Comments

Delayed

Time Base

ON OFF

Y-T

X-Y

Roll

Turn on Delayed Scan mode. Turn off the Delayed Scan mode.

Show the relative relation between vertical voltage and horizontal time. Show CH1 value at X axis; CH2 value at Y axis. In Roll Mode, the waveform display updates from right to left.

Trig-offset Reset Adjust to the center.

①② ③

④ ⑤

Figure 2-32 Status bar and mark for Horizontal control

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Marks Indicator

① The current waveform window’s position in the memory.

② The trigger position in the memory.

③ The trigger position in the current waveform windows.

④ The horizontal time base (main time base).

⑤ The trigger’s horizontal offset according to the center of the window.

Key Points Y-T: The conventional oscilloscope display format. It shows the voltage of a

waveform record (on the vertical axis) as it varies over time (on the horizontal axis).

X-Y: XY format displays channel 1 in the horizontal axis and channel 2 in the

vertical axis.

Roll Mode: In this mode, the waveform display rolls from right to left. No trigger

or horizontal offset control of waveforms is available during Roll Mode, and it’s only available when set to 500 ms/div or slower.

Slow Scan Mode: This mode is available when the horizontal time base is set to

50ms or slower. In this mode, the oscilloscope acquires sufficient data for the left part to the trigger point, then wait for trigger, when trigger occurs, it continue to draw the rest part from the trigger point to the end of the right side. When choosing this mode to view low frequency signals, it is recommended that the channel coupling be set as DC.

Time/Div: Horizontal scale. If the waveform acquisition is stopped (using the

RUN/STOP button), the Time/Div control expands or compresses the waveform.

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y

Delayed Scan:

The Delayed Scan is a magnified portion of the main waveform window. Use Delayed Scan to locate and horizontally expand part of the main waveform window for a more

detailed (higher horizontal resolution) analysis of signal. The Delayed Scan time base

setting cannot be set slower than the Main time base setting.

Time base of Dela

ed Scan

Waveform to be horizontally expanded

Expanded waveform in horizontal

Main timebase

Figure 2-33 Delayed Scan windows

The following steps show you how to use Delayed Scan.

1. Connect a signal to the oscilloscope and obtain a stable display.

2. Press horizontal MENU→Delayed→ON or press horizontal knob to

enter Delayed Scan mode.

The screen splits into two parts. The upper half displays the main waveform window and the lower half displays an expanded portion of the main waveform window. This expanded portion of the main window is called the Delayed Scan window. Two blocks shaded at the upper half; the un-shaded portion is expanded in the lower half. The horizontal

and knobs control the size and position of the Delayed Scan. The value at bottom of the screen is the main time base and the value on the center bottom means the Delayed Scan time.

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z Use the horizontal knob to change the position of the expanded

portion.

z Use the horizontal

knob to adjust the Delayed Scan resolution.

z To change the main time base, turn off the Delayed Scan mode.

z Since both the main and Delayed Scan are displayed; there are half as many

vertical divisions so the vertical scaling is doubled. Notice the changes in the status bar.

Delayed Scan Shortcut Key:

Delayed Scan function can be activated not only by menu but also by pressing horizontal

knob.

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X-Y Format

This format is useful for studying phase relationships between two signals.

Channel 1 in the horizontal axis(X) and channel 2 in the vertical axis(Y), the oscilloscope uses a none-trigger acquisition mode, data is displayed as dots. .

Figure 2-34

X-Y display format

The following modes or functions will not work in X-Y format.

z Automatic Measurements

z Cursor Measurements

z REF and MATH Operations

z Delayed Scan Mode

z Vector Display Mode

z Horizontal

knob

z Trigger Controls

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Understand the Trigger System

The trigger determines when the oscilloscope starts to acquire data and display a waveform. When a trigger is set up properly, it can convert unstable displays or blank screens into meaningful waveforms.

When the oscilloscope starts to acquire a waveform, it collects enough data so that it can draw the waveform to the left of the trigger point. The oscilloscope continues to acquire data while waiting for the trigger condition to occur. After it detects a trigger, the oscilloscope continues to acquire enough data so that it can draw the waveform to the right of the trigger point.

The trigger control area on the front panel includes a knob and three buttons:

: The knob that set the trigger level; press the knob and the level will

reset to zero.

50%: The instant execute button setting the trigger level to the vertical

midpoint between the peaks of the trigger signal

FORCE: Force to create a trigger signal and the function is mainly used in

Normal and Single mode

MENU: The button that activates the trigger controls menu.

Figure 2-35 Trigger controls

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Trigger Modes

The oscilloscope provides seven trigger modes: Edge, Pulse, Slope, Video and Alternative.

Edge: An edge trigger occurs when the trigger input passes through a specified

voltage level in the specified slope direction.

Pulse: Use this trigger type to catch pulses with certain pulse width. Video: Use video trigger on fields or lines for standard video signals.

Slope: The oscilloscope begins to trigger according to the signal rising or falling

speed.

Alternative: Trigger on non-synchronized signals.

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Settings for Edge Trigger

An edge trigger determines whether the oscilloscope finds the trigger point on the rising or the falling edge of a signal. Select Edge trigger Mode to trigger on Rising edge, falling edge or rising & falling edge.

Figure 2-36 Table 2-17 The Trigger menu

Menu Settings Comments

Select CH1 as trigger signal. Select CH2 as trigger signal. Select EXT TRIG as trigger signal. Select attenuated EXT TRIG/5 as trigger signal. Select power line as trigger signal.

Trigger on rising edge. Trigger on falling edge. Trigger on both ring & falling edge.

Acquire waveform even no trigger occurred. Acquire waveform when trigger occurred. When trigger occurs, acquire one waveform then stop.

To go to Set Up menu, see table 2-32 and table 2-33

Source

Slope

Sweep

Set up

CH1 CH2 EXT EXT/5

AC Line

Rising Falling

Rising & Falling

Auto

Normal

Single

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Settings for Pulse Width Trigger

Pulse trigger occurs according to the width of pulse. The abnormal signals can be detected through setting up the pulse width condition.

Figure 2-37 Table 2-18 The Trigger menu (Page 1/2)

Menu

Settings Comments

CH1 CH2

Source

EXT

EXT/5

(+Pulse width less than)

(+Pulse width more than)

When

Settings

(+Pulse width equal to)

(-Pulse width less than)

(-Pulse width more than)

(-Pulse width equal to)

<Width>

Figure 2-38 Table 2-19 The Trigger menu (Page 2/2)

Menu Settings Comments

Sweep

Set Up

Auto Normal Single

To go to Set Up menu, see table 2-32 and table

Acquire waveform even no trigger occurred. Acquire waveform when trigger occurred. When trigger occurs, acquire one waveform and then stop.

2-33.

Selects CH1 as trigger signal. Select CH2 as trigger signal. Select EXT TRIG as trigger signal. Select attenuated EXT TRIG/5 as trigger signal.

To select pulse condition.

Set required pulse width.

Note: The Pulse width adjust range is 20ns ~ 10s. When the condition is met, it will

trigger and acquire the waveform.

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Settings for Video Trigger

Choose video trigger to trigger on fields or lines of NTSC, PAL, or SECAM standard video signals. Trigger coupling preset to DC.

Figure 2-39 Table 2-20 The Video Trigger menu (Page 1/2)

Menu Settings Comments

CH1 CH2

Source

EXT EXT/5

Normal polarity

Polarity

Inverted polarity

All Lines Line Num

Sync

Odd field Even field

Figure 2-40 Table 2-21 The Video Trigger menu (Page 2/2, when Sync is set as

the specified line)

Menu

Settings Comments

Selects CH1 as trigger source. Select CH2 as trigger source. Select EXT TRIG as trigger source. Select EXT TRIG/5 as trigger source.

Triggers on negative going sync pulses.

Triggers on positive going sync pulses.

Trigger on all lines. Trigger on an specified line.

Select to trigger on odd field. Select to trigger on even field.

Line Num

Standard

< Line sync >

PAL/SECM NTSC

Auto

Sweep

Normal

Single

Set Up

User’s Guide for DS1000CA Series

Select the specified line number for sync.

Select Video standard.

Force the oscilloscope to trigger in the absence of trigger condition. Lets oscilloscope to trigger in the suitable trigger condition. Lets oscilloscope to trigger one time in the suitable trigger condition, then stop.

To go to set up menu, see Table 2-32

and table 2-33.

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Figure 2-41 Table 2-22 The Video Trigger menu (When the Sync is set as All lines,

Odd field and Even field)

Menu Settings Comments

Standard

Sweep

Set Up

PAL/SECAM NTSC

Auto

Normal

Single

Select Video standard.

Force the oscilloscope to trigger in the absence of trigger condition. Lets oscilloscope to trigger in the suitable trigger condition. Lets oscilloscope to trigger one time in the suitable trigger condition, then stop.

To go to set up menu, see Table 2-32

and table 2-33.

Key points Sync Pulses: When Normal Polarity is selected, the trigger always occurs on

negative-going sync pulses. If the video signal has positive-going

sync pulses, use the inverted Polarity.

Figure 2-42

Video Trigger: Line Synchronization

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Figure 2-43

Video Trigger: Field Synchronization

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Slope Trigger

Slope trigger sets the oscilloscope as the positive/negative slope trigger within the specified time

Figure 2-44 Table 2-23 The Slope Trigger menu (Page 1/2)

Menu

Source

Settings Comments

CH1

CH2

EXT

EXT/5

Set channel 1 as trigger source. Set channel 2 as trigger source. Set EXT. channel as trigger source. Set EXT/5 as trigger source.

When

Set slope condition.

Time

Set slope time.

Figure 2-45 Table 2-24 The Slope Trigger menu (Page2/2)

Menu

Vertical

Settings Comments

Select the level that can be adjusted by

.

Acquire waveform even when no trigger condition is met. Acquire waveform when trigger condition is met. When trigger condition is met, acquire one waveform and then stop.

To go to set up menu. See Table 2-32 and table 2-33.

Sweep

Set Up

Auto

Normal

Single

Note: Slope time can be set from 20ns to 10s. When a signal meets the trigger

condition, scope will execute the acquisition. You can adjust LEVEL A/ LEVEL B or both simultaneous by turning the

User’s Guide for DS1000CA Series

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Alternative Trigger

When alternative trigger is on, the trigger sources come from two vertical channels. This mode can be used to observe two non-related signals. You can choose two different trigger modes for the two vertical channels. The options are as follows: Edge, Pulse, Slope and video. The info of the trigger level of the two channels will be displayed on the upper-right of the screen.

Figure 2-46 Table 2-25 The Alternative menu (Trigger Type: Edge)

Menu

Select

Settings Comments

CH1

CH2

Set trigger mode for Channel 1. Set trigger mode for Channel 2.

Type Edge Set Edge Trigger as the trigger type.

Slope

Set Up

(Rising)

(Falling)

(Rising & Falling)

To go to set up menu. See Table

Trigger on rising edge. Trigger on falling edge. Trigger on both ring & falling edge.

2-32 and table 2-33.

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Figure 2-47 Table 2-26 The Alternative menu (Trigger Type: Pulse Page 1/2)

Menu

Select

CH1

CH2

Type Puls e

When

Settings Comments

Set trigger mode for Channel 1. Set trigger mode for Channel 2.

Set Pulse Trigger for the channel.

(+Pulse width less than)

(+Pulse width more than)

(+Pulse width equal to)

(-Pulse width less than)

(-Pulse width more than)

(-Pulse width equal to)

To select pulse condition.

Figure 2-48 Table 2-27 The Alternative menu (Trigger Type: Pulse Page 2/2)

Menu Settings Comments

Setting

Set Up

<

pulse width>

To go to set up menu. See Table 2-32

Set the width of the pulse.

and table 2-33.

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Figure 2-49 Table 2-28 The Alternative menu (Trigger Type: Slope Page 1/2)

Menu Settings Comments

Select

CH1

CH2

Type Slop e

Set trigger mode for Channel 1. Set trigger mode for Channel 2.

Set Slope Trigger for the vertical channel.

When

Set trigger condition.

Figure 2-50 Table 2-29 The Alternative menu (Trigger Type: Slope Page 2/2)

Menu Settings Comments

Time

<

Time Set >

Set slope time.

Select the level to be adjusted by

Vertical

.

Set Up

To go to set up menu. See Table

2-32 and table 2-33.

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Figure 2-51 Table 2-30 The Alternative menu (Trigger Type: Video Page 1/2)

Menu Settings Comments

Select

CH1

CH2

Set trigger mode for Channel 1. Set trigger mode for Channel 2.

Type Video Video Trigger for the channel.

Trigger on negative going sync pulses. Trigger on positive going sync pulses.

Polarity

Normal polarity

Inverted polarity

Figure 2-52 Table 2-31 The Alternative menu (Trigger Mode: Video Page 2/2)

Menu Settings Comments

ALL lines Line Num

Trigger on all lines. Trigger on an specified line.

Sync

Line Num

Odd field Even field

Select to trigger on odd field or even field.

Select the specified line number for sync.

Standard

Set Up

PAL/SECM NTSC

Select Video standard.

To go to set up menu. See Table 2-32 and table 2-33.

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Trigger Settings

Set up different trigger settings according to different trigger modes. When in the mode of Edge and Pulse, only Holdoff is adjustable. When source is non-digital channel and in slope trigger, only trigger coupling, trigger sensitivity and Holdoff can be set. For video trigger, Sensitivity and Holdoff can be set.

Figure 2-53 Table 2-32 The Trigger Set Up menu (Settings for trigger coupling,

trigger sensitivity and holdoff)

Menu Settings Comments

Coupling

Sensitivity

DC AC HF Reject LF Reject

Allow all signals pass. Block DC signals. Reject high frequency signals. Reject DC and low frequency signals.

Set trigger sensitivity.

Holdoff

Reset

User’s Guide for DS1000CA Series

Set time slot before another trigger event.

Reset Holdoff time to 100ns.

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Figure 2-54 Table 2-33 The Trigger Set Up menu (Settings for sensitivity and

holdoff)

Menu Settings Comments

Sensitivity

Holdoff

Holdoff Reset

Set trigger sensitivity.

Set time slot before another trigger event.

Reset Holdoff time to 100ns.

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Trigger Holdoff

Use trigger Holdoff to stabilize a complex waveform, such as a pulse range. Holdoff time is the oscilloscope’s waiting period before starting a new trigger. During Holdoff, oscilloscope will not trigger until Holdoff ends. For instance: To trigger on the first pulse on a group of them, users can set the holdoff time to Pulse cluster width.

Trigger site

Trigger holdoff

Time of holdoff

Figure 2-55 Trigger Holdoff

To use trigger Holdoff:

1. Press the trigger MENU button to display the Menu.

2. Press Set Up key to display trigger set up menu.

3. Turn the multi function knob (

) to change Holdoff time until waveform is stable.

4. Pushing Trigger Hold off reset to reset the Holdoff time to its default value.

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Trigger Key points

1. Trigger Source:

Trigger occurs from several sources: Input channels (CH1 and CH2), AC Line, Ext, Ext/5.

z CH1 or CH2:

It is the most commonly used trigger source. The channel works when selected

as a trigger source whatever displayed.

z Ext Trig:

The instrument can be triggered from a third source while acquiring data from CH1 and CH2. For example, to trigger from an external clock or with a signal from another part of the test circuit. The Ext, Ext/5 trigger sources use an external trigger signal connected to the EXT TRIG connector. Ext uses the signal directly; it has a trigger level range of +1.6 V to -1.6 V. The EXT/5 trigger source attenuates the signal by 5X, which extends the trigger level range to +8 V to -8 V allowing the oscilloscope to trigger on a larger signal.

z AC Line:

AC power can be used to display signals related to the power line frequency, such as lighting equipment and power supply devices. The oscilloscope gets triggered on its AC power input, an AC trigger signal is not required. When AC Line is selected as trigger source, the oscilloscope automatically set coupling to

DC, set trigger level to 0V.

2. Sweep Mode:

The sweep mode determines how the oscilloscope behaves in the absence of a trigger event. The oscilloscope provides three trigger modes: Auto, Normal, and

Single.

z Auto:

This sweep mode allows the oscilloscope to acquire waveforms even when it does not detect a trigger condition. If no trigger condition occurs while the oscilloscope is waiting for a specific period (as determined by the time-base setting), it will force itself to trigger.

User’s Guide for DS1000CA Series

When forcing invalid triggers, the oscilloscope cannot synchronize the waveform, and the waveform seems to roll across the display. If valid triggers occur, the display becomes stable on the screen.

Any factor results in the un-stability of waveforms can be detected by Auto Trigger, such as the output of Power supply.

NOTE: When horizontal control is set under 50 ms/div, Auto mode allows the

oscilloscope not to capture trigger signal.

z Normal:

The Normal mode allows the oscilloscope to acquire a waveform only when it is triggered. If no trigger occurs, the oscilloscope keeps waiting, and the previous waveform, if any, will remain on the display.

z Single:

In Single mode, after pressing the RUN/STOP key, the oscilloscope waits for trigger. While the trigger occurs, the oscilloscope acquires one waveform then

stop.

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3. Coupling:

Trigger coupling determines which signal component passing to the trigger circuit.

Coupling types include AC, DC, LF Reject and HF Reject.

 AC: AC coupling blocks DC components.  DC: DC coupling passes both AC and DC components.  LF Reject: LF Reject coupling blocks DC component, and attenuates all

signal with a frequency lower than 8 kHz.

 HF Reject: HF Reject coupling attenuates all signals with a frequency

higher than 150 kHz.

4. Pre-trigger/delayed trigger:

The data collected before and after trigger.

The trigger position is typically set at the horizontal center of the screen. In the full-screen display the 6div data of pre-trigger and delayed trigger can be

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surveyed. More data (14div) of pre-trigger and 1s delayed trigger can be surveyed by adjusting the horizontal

knob.

This feature is very useful to study the events that led up to the trigger point. Everything to the right of the trigger point is called post-trigger information. The delay range (pre-trigger and post-trigger information) depends on the sweep speed selected.

5. Adjustable trigger sensitivity

To avoid the influence of noise from the physical world, and get the stable trigger, the trigger circuit has adopted Stickiness. In DS1000CA series, the stickiness is adjustable from 0.1div-1.0div, which means when it sets to 1.0div, the trigger circuit will not affect any signal with peak-peak amplitude less than 1.0div, so as

to avoid the influence of the noise.

User’s Guide for DS1000CA Series

To Set Up the Sampling System

Figure 2-56 shows, the Acquire button at the MENU of the front panel.

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Acquire setup button

Figure 2-56

The menu

Press the Acquire button, the interface menu shows as follows:

Figure 2-57

Table 2-34 The Acquire menu

Menu Settings Comments

Normal

Acquisition

Average Peak Detect

Averages 2 to 256

Sampling

SinX/X

Real-Time Equ-Time

ON OFF

Normal Acquisition mode. Average Acquisition mode. Peak Detect Acquisition mode.

Step by multiple of two. Set average times from 2 to 256.

Real-time sampling mode. Equivalent sampling mode.

Set the insert mode is SinX or Line.

Sa Rate Display sampling rate.

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The waveform displayed on the screen will change in conjunction with the setting of Acquire menu.

Figure 2-58

Signal that contains noise, and without average sampling

Figure 2-59

Display signal after average sampling

Note:

z Select Real-time acquisition to observe the single-shot or pulse signals. z Select Equ-Time to observe high frequency repetitive signals.

User’s Guide for DS1000CA Series

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z To reduce the displayed random noise, select the Average Acquisition. This

mode would make the screen refresh slower.

z To Avoid signal aliasing, select Peak Detect Acquisition.

Figure 2-60

Signal with Peak Detect Acquisition

The Peak Detect effect is shown as the figure above.

Stop Acquisition: When the scope is acquiring waveforms, the waveforms is in a

live status; when acquisition is stopped, frozen waveform will be displayed, the position and scale can still be adjusted by vertical control and horizontal control.

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Key Points Real-time Sampling:

DS1000CA has Real-time sampling rate up to 2GSa/s. At the time base 20ns or faster, the oscilloscopes use the sine(x)/x interpolation to expand the horizontal

time base.

Equivalent sampling:

Known as Repetitive sampling to get up to 20ps of horizontal resolution (equivalent 50Gsa/s). This mode is good for observing repetitive signals, and it is not

recommended for single-shot or pulse.

Normal:

Oscilloscope acquires signal by equal time interval.

Average Acquisition:

Apply averaging to your signal to remove uncorrelated noise and improve measurement accuracy. Reduces random or uncorrelated noise in the signal display. The averaged waveform is a running average over a specified number of acquisitions from 2 to 256.

Peak Detect:

Peak Detect mode captures the maximum and minimum values of a signal. Finds highest and lowest record points over many acquisitions.

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To Set Up the Display System

Figure 2-61 shows the menu button for the display system on the front panel.

Display setup button

Figure 2-61 The menu

Press the Display button, the interface menu for settings shows as follows.

Figure 2-62 Table 2-35 The Display menu (Page 1/3)

Menu

Type

Clear

Persist

Intensity

Setting Comments

Vectors Dots

Display waveforms as vectors. Display waveforms as dots.

Clear all existing waveforms from screen.

Infinite

OFF

<

percentage>

The sample points remain displayed until turn the persistence “OFF”. Turn off the persistence function.

Set up waveform intensity.

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Figure 2-63

Table 2-36 The Display menu (Page 2/3)

Menu Settings Comments

Function

Grid

Menu Display

Normal

Intensity

1s 2s 5s 10s 20s

Infinite

The waveform is displayed at the same intensity. The intensity of waveforms is connecting to probability.

Display grids and coordinates on the screen. Turn off the grids. Turn off the grids and coordinates.

Set the time before menu fades away. The menu will be hidden after the set time of last button pressing.

Figure 2-64

Table 2-37 The Display menu (Page 3/3)

Menu Settings Comments

Brightness

Screen

<

percentage>

Normal Inverted

Set up grid brightness.

Set to normal mode. Set to invert color display mode.

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Key points: Display type: Display type includes Vector and Dot. In vectors type, oscilloscope

connects dots through digital interpolation including both linearity and sin(x)/x. Sin(x)/x interpolation is suitable for Real-time sampling and will be more effective at 50ns or faster time base.

Refresh rate: It is an important performance of digital oscilloscopes. It means the

number of display refreshing per second and it will affect the ability to observe signal.

Adjusting waveform intensity

Default setup of multi-function knob (

) is adjusting waveform intensity.

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To Store and Recall Waveforms or Setups

Figure 2-65 shows the menu button for the storage system on the front panel.

Storage setup button

Figure 2-65 The menu

Press the Storage button to show the menu for the settings of the storage system. Waveforms and setups can be stored in and recalled from, both internal memory and external memory. The waveform file, setup file, bitmap and CSV file in external memory can be created and deleted. System supports English/Chinese file name input.

Waveform and setup menus are as follows:

Figure 2-66

Table 2-38 The Storage menu

Menu Settings Comments

Waveform Setups

Storage

Bit map CSV Factory

Internal

External

Disk Mana.

Store or recall waveform. Store or recall instrument setups. Create or delete bit map files. Create or delete CSV files. Recall factory setups.

Go to menu for internal memory operation (see Table 2-42).

Go to menu for external memory operation (see Table 2-43).

Go to disk manage menu (see Table 2-44).

User’s Guide for DS1000CA Series

For factory default setups, the menu is as follows:

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Figure 2-67

Table 2-39 The Storage menu

Menu Settings Comments

Store or recall waveform. Store or recall instrument setups. Create or delete bit map files. Create or delete CSV files. Recall factory setups.

Storage

Waveform Setups Bit map CSV Factory

Load Recall factory setups or files.

Disk Mana.

Go to disk manage menu (see Table 2-44).

For CSV, the menu is as follows:

Figure 2-68 Table 2-40 The Storage menu

Menu

Storage

Data Depth

Settings Comments

Waveform Setups Bitmap CSV Factory Displayed

Maximum

Store or recall waveform. Store or recall setups. Create or delete bit map files. Create or delete CSV files. Recall factory setups. Save currently displayed waveform data to CSV file. Save the whole waveform data in memory to CSV file.

Para Save

On Off

External

Disk Mana.

Save the current oscilloscope settings in different format with the same file name. Go to menu for external memory operation (see Table 2-43). Go to disk manage menu (see Table 2-44).

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For bitmap, the menu is as follows.

Figure 2-69 Table 2-41 The Storage menu

Menu Settings Comments

Waveform Setups

Storage

Bit map CSV Factory

Para Save

On Off

External

Disk Mana.

Store or recall waveform. Store or recall setups. Create or delete bit map files. Create or delete CSV files. Recall factory setups. Save the current oscilloscope settings in different format with the same file name. Go to menu for external memory operation (see Table 2-43). Go to disk manage menu (see Table 2-44).

User’s Guide for DS1000CA Series

Internal Memory

Press Storage→Internal to go to the following menu.

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Figure 2-70

Table 2-42 The Memory menu

Menu Settings Comments

Int_00 (N)

Internal

. . .

Set up the location of files in internal memory.

Int_09 (N)

Load

Save

Recall waveform files and setup files from the internal memory location.

Save waveform files and setup files to the internal memory location.

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External Memory

Press Storage→ External to go to the following menu.

Figure 2-71

Table 2-43 The Memory menu

Menu Settings Comments

Explorer

New File (Folder)

Delete File

Load

File system as follows:

Path

Back to previous folder

Path Directory

Switch among Path, Directory and File.

File

To create new file or folder.

Delete file (Folder).

Recall waveform and setup from USB storage device.

Current directory

Files

File info.

Figure 2-72

File system

User’s Guide for DS1000CA Series

Disk Management

Press Storage→Disk Mana. to go to the following menu.

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Figure 2-73

Figure 2-74

Table 2-44 The Disk Management menu (Page 1/2)

Menu Settings Comments

Path

Explorer

New folder

Delete File Delete file.

Load

Table 2-45 The Disk Management menu (Page 2/2)

Menu Settings Comments

Rename To rename a file (see Table 2-46).

Disk info Display disk information.

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