Tektronix 2445B, 2455, 2465B Operator's Manual

Tektronix

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2445B/2455B/2465B Oscilloscope and Options Operator Manual

070-6860-00

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Tektronix

2445B/2455B/2465B Oscilloscope and Options Operator Manual

070-6860-00

Please check for change information at the rear of

this

manual.

First Printing: May 1988 Revised Printing: October 1990

Instrument Serial Numbers

Each instrument manufactured by Tektronix has a serial number on a panel insert or tag, or stamped on the chassis. The first letter in the serial number designates the country of manufacture. The last five digits of the serial number are assigned sequentially and are unique to each instrument. Those manufactured in the United States have six unique digits. The country of manufacture is identified as follows:

B010000 Tektronix, Inc., Beaverton, Oregon, USA E200000 Tektronix United Kingdom, Ltd., London J300000 Sony/Tektronix, Japan H700000 Tektronix Holland, NV, Heerenveen, The Netherlands

Instruments manufactured for Tektronix by external vendors outside the United States are assigned a two digit alpha code to identify the country of manufacture (e.g.,

JP for Japan, HK for Hong Kong, IL for Israel, etc.). Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077 Printed in

U.S.A.

■!■

Tektronix, Inc., 1988

WARRANTY

Tektronix warrants that this product will be free from defects in materials and workmanship for a period of

three

(3) years from the date of shipment. If any such

product proves defective during this warranty

period,

Tektronix, at its

option,

either

will repair the defective product without charge for parts and

labor,

wiii

provide a

replacement in exchange for the defective product. In order

obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for

packaging and shipping the defective product to the service center designated by

Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the

product to Customer if

the

shipment

to a location within the country in which the

Tektronix service center is located. Customer shall be responsible for paying all

shipping charges, duties, taxes, and any other charges for products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper

use or improper or inadequate maintenance and care. Tektronix shall not be

obligated to furnish service under this warranty

to repair damage resulting from

attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair damage resulting from improper use or connection to incompatible equipment; or c) to service a product that has been modified or

integrated with other products when the effect of such modification or integration

increases the time or difficulty of servicing the product. THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS

PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESSED OR

IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR

PURPOSE. TEKTRONIX' RESPONSIBILITY TO REPAIR OR REPLACE

DEFECTIVEPRODUCTSISTHESOLEANDEXCLUSIVEREMEDYPROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND

ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL,

INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF

WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE

POSSIBILITY

SUCH DAMAGES.

Certificate of the Manufacturer^lmporter

We hereby certify that the .

2465B/2455B/2445B OSCILLOSCOPE AND ALL INSTALLED OPTIONS

complies with the RF Interference Suppression requirements of Amtsbl.-Vfg 1046/1984.

The German Postal Service was notified that the equipment is being

marketed. The German Postal Service has the right to re-test the series and to

verify that it complies.

TEKTRONIX

Bescheinigung des Herstellers/lmporteurs

Hiermit wird bescheinigt, da# der/die/das

2465B/2455B/2445B OSCILLOSCOPE AND ALL INSTALLED OPTIONS

in Ubereinstimmung mit den Bestimmungen der Amtsblatt-Verfugung

1046/1984 funkentstoYt ist. Der Deutschen Bundespost wurde das Inverkehrbringen dieses Gerates

angezeigt und die Berechtigung zur Uberprufung der Serie auf Einhalten der Bestimmungen eingeraumt.

TEKTRONIX

NOTICE to the user/operator: The German Postal Service requires that Systems assembled by the

operator/user of this instrument must also comply with Postal Regulation, Vfg. 1046/1984, Par. 2, Sect. 1.

HINWEIS fur den Benutzer/Betreiber: Die vom Betreiber zusammengestellte Anlage, innerhalb derer dies

Gerat eingesetzt

wird,

mu/3

ebenfalls den Voraussetzungen nach Par. 2,

Ziff. 1 der Vfg. 1046/1984 genugen.

NOTICE to the user/operator: The German Postal Service requires that this equipment, when used in a

test setup, may only be operated if the requirements of Postal

Regulation, Vfg. 1046/1984, Par. 2, Sect. 1.7.1 are complied

with. HINWEIS fur den Benutzer/Betreiber: Dies Gerat darf in Meflaufbauten nur betrieben werden, wenn die

Voraussetzungen des Par. 2,

Ziff.

1.7.1 der Vfg. 1046/1984 eingehalten

werden.

The

2465B, 2455B,

and 2445B

TheTEKTRONIX 2465B, 2455B, and 2445B portable oscilloscopes have four vertical channels with DC to 400 MHz, 250 MHz, and 150 MHz bandwidths. Deflection factors run from 2 mV to 5 V per division, in a 1-2-5 sequence, with either 1 MH or 50 Cl input resistance, in channels 1 and 2. Either AC or DC input coupling is available at 1 MfL

Channels 3 and 4 give 0.1 V or 0.5 V per division, with 1 MH input resistance, and DC coupling.

With the standard 10X probes, channels 1 and 2 display 20 mV to 50

V/division and channels 3 and 4 display 1 V or 5 V/division.

The trigger system works automatically for most signals. They operate in various modes, from any channel, with optimum couplings for a wide range of signals. The 2445B triggers from DC to 250 MHz. The 2455B and 2465B trigger from DC to

500 MHz.

Sweep speeds range from 1.5 s to 1 ns per division on the 2445B and 2455B and to 500 ps per division on the 2465B, including the effects of the X10 magnifier and the calibrated variable between 1-2-5 steps. Horizontal displays include A-Sweep,

B-Sweep (delayed), A alternated with B, and CH 1 (for X/Y displays).

The SETUP features. AUTO, SAVE, and RECALL, save time and prevent errors. whether you are a novice operator or a master. AUTO Setup works with almost any

signal.

For repeating measurements, the Save and Recall functions record and restore

as many as 30 instrument setups, including the extended-function options. Setups can

be recalled either immediately or sequentially.

Digital readouts of time, voltage, scale factors, trigger levels, and auxiliary information

also save time and reduce errors.

With Parametric Measurements, common measurements such as frequency, period, amplitude, pulse width, duty factor, rise time, fall time, and propagation delay can be

made automatically. Each measurement activation displays the results in the CRT readout. Measurement results remain on-screen until any other button is pressed.

For instruments with serial numbers B049999 and below with firmware Version

11 and above or for instruments serial numbers B050000 and above with firmware Version 2 and above the following function is available. The RECALL button resets

the instrument into the mode of operation it was in prior to performing the parametric measurement or AUTO Setup.

With the available Counter/Timer/Trigger (CTT), Option 06 or Option 09, measurements require even less effort and give better accuracy. The CTT increases trigger selectivity, especially in digital systems. Option 09 includes the CTTand a 17-bit Word Recognizer

{WR).

The available TelevisionA/ideo (TV) enhancement, Option 05, can

trigger at any desired point in a frame and it can reduce the effects of ac coupling and

hum in a video signal. The available Digital Multimeter (DMM) measures dc voltage, dc current, ac rms current, resistance, and temperature with floating inputs.

2465B/2455B/2445B Operators

The 2465B, 2455B, and 2445B

The

adds a Word Recognizer Probe connector on the rear panel. The

enhancement adds LINES, FLD1, and FLD2 Trigger Coupling.

The available GPIB interface accesses all controls and digital readings. The interface adds GPIB status indicators, just above the CRT. See the 24X5B/2467B GPIB (Option 10) Instrument Interfacing Guide for information on integrating the instrument into a GPIB system.

The 2465B CT includes C7Tand WR (Option9) and GPIB (Option 10). The 2465B DM adds DMM (Option 01) and also includes CTT and WR (Option 9) and GPIB (Option 10). The 2465B DV adds TV (Option 05) to the features of the 2465B DM.

Illustrations at the back of the manual show the instrument front and rear panels.

2465B/2455B/2445B Operators

Page

Preface i Illustrations vi

Tables vii

Operators Safety Summary viii

"j Genera! Information

Preparation for Use 1-1

Safety 1-1 Line Voltage Selection 1-1 Line Fuse 1-1 Power Cord 1-3

Instrument Cooling 1-4

Start-up 1-4

Repackaging For Shipment 1-5

2 Operation

Fundamentals 2-1 Parametric Measurements 2-1 Getting a Display 2-2 Assigning Parametric Measurements to Auto Setup 2-3 Vertical 2-4 Horizontal 2-6 Trigger Controls 2-6 Video Triggering 2-9 Readout 2-10 Measurements with Cursors 2-13 Voltage Measurements 2-15 Display Operation 2-15 Signal Connections 2-16 Magnify Waveform Details with Delayed-Sweep 2-17 B-Trigger

Operation 2-18 Delta-Delay-Time 2-19 Single-Delay-Time Measurements 2-20

Time Interval Measurement 2-21

Precision Timing 2-22 Triggered Delta-Delay-Time Measurements 2-23 Time Interval Resolution 2-25 Measurement Updating 2-25 Frequency, Period, and Totalize Counting 2-27 Frequency Measurement with External Reference (Option 1E) 2-28 Delay Sweeps by Event Counts 2-28 Logic Triggering 2-32 Word Recognizer Operation 2-34 The Word Out Signal 2-35

Frequency Limit for Auto Level or Parametric Measurements 2-35 DMM \ 2-35 Save and Recall Operation 2-36

2465B/2455B/2445B Operators iii

Contents

3 Applications

Peak-to-Peak Voltage 3-1 Absolute Voltages Using Cursors 3-1 Noise Immunity 3-2 DC Voltage Measurement 3-3 Amplitude Modulation 3-3 Frequency Modulation 3-4 Measuring Video Signals in IRE Units 3-5 Avoiding False Displays with Multi-Mode Signals 3-5 Algebraic Addition to Detect Coincidence or Cancel Interference 3-5 Observing Coincidence of Digital Signals 3-6 Measuring Off-Ground Signals And Cancelling Interference 3-6

Period and Frequency 3-8 Rise Time and Fall Time 3-9 Propagation Delay 3-11 Setup and Hold Times 3-12 Slew Rate 3-13 Time Ratio (Duty Factor) 3-13 Phase Difference Between Two Signals 3-15 Measuring Millivolt Signals 3-17

4 Checks and Adjustments

Introduction 4-1 Initial Setup 4-1 Trace Rotation and Adjustment 4-2 Astigmatism Adjustment 4-2 Auto DC Balance Routine 4-3 Probe Compensation 4-4

Matching Channel 2 Delay 4-5 Amplitude Check 4-6 Timing Check 4-7

Q Controls, Connectors, and Indicators

Introduction 5-1

Power And Display 5-1

Setup and Vertical 5-4

Horizontal 5-12

Delay and Delta Controls 5-15

Rear Panel 5-27

DMM 5-29

DMM Displays 5-33 Display-Mode Interactions 5-33

iv 2465B/2455B/2445B Operators

Performance Characteristics

Performance Conditions 6-1

"J Options and Accessories

Introduction 7-1 Option 11 7-1 Option 1R 7-1 Power Cord Options 7-2 Standard Accessories 7-3 Optional Accessories 7-5

Appendix A

Extended Functions with Diagnostic Exercisers A-1

Appendix B

Sequence Programming and Operation B-1 Executing Sequences B-3

Appendix C

Power Up Tests C-1

Kernel Test C-1

Confidence Tests C-1

Appendix D

Delta-Time and Delta-Delay-Time Accuracy under Noted

Conditions for theC/T/T Option D-1

Delay-Time Accuracy under Noted Conditions for the

C/T/T Option D-2

2465B/2455B/24-45B Operators

Contents

Illustrations

Figure Page

1-1 Line selector switch, line fuse, and detachable power cord 1-3

2-1 Readout display locations 2-11

3-1 Instantaneous voltages 3-2 3-2 Eliminating common-mode signals 3-7

3-3 Measuring rise times 3-10 3-4 Time between two pulses (cursor method) 3-12 3-5 Time ratio (duty factor) 3-14 3-6 Phase difference between two signals 3-16 3-7 Small-angle phase difference 3-16

4-1 Probe low-frequency compensation 4-4

5-1 Power and display controls 5-3

5-2 SETUP and MODE buttons, and CH 1 and CH 2 POSITION controls 5-7 5-3 Channel 1 and Channel 2 controls and connectors 5-8 5-4 CH 3 and CH 4 controls and connectors and CALIBRATOR output 5-11 5-5 Horizontal and delta measurement controls 5-19 5-6 Trigger controls and indicators 5-26

5-7 Rear panel controls and connectors 5-28

5-8 DMM controls and connectors 5-32

6-1 Dimensional drawing 6-39

2465B/2455B/2445B Operators

Contents

Tables

Table Page

1-1 Power Cord and Voltage Data 1-2 2-1 Resolution Selections 2-26

2-2 Auto Resolution 2-26 2-3 Delay-by-Events Combinations 2-29 2-4 Sweep Triggering 2-33

6-1 2465A/2455A/2445A Electrical Characteristics 6-2 6-2 Option 01 (DMM) Electrical Characteristics 6-19 6-3 Option 05 (TV) Electrical Characteristics 6-26 6-4 Option 06 (C/T/T) Electrical Characteristics 6-29 6-5 Option 09 (WR) Electrical Characteristics 6-35 6-6 Option 10 (GPIB) Electrical Characteristics 6-37

6-7 Mechanical Characteristics 6-38

6-8 Environmental Requirements 6-40

C-1 Confidence Test Numbers and Affected Functions C-2

2465B/2455B/2445B Operators vii

Operators Safety Summary

Operators Safety

Summary

The general

safety

information

in this part of

the summary

is for both

operating

and servicing personnel. Specific warnings and cautions will be found

throughout the manual where they apply

and do not

appear

in this

summary.

Terms

In This Manual

CAUTION statements identify conditions or practices that could result in damage to the equipment or other property.

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

As Marked on Equipment

CAUTION indicates a personal injury hazard not immediately accessible as one reads the markings, or a hazard to property, including the equipment

itself.

DANGER indicates a personal injury hazard immediately accessible as one

reads the marking.

Symbols

In This Manual

This symbol indicates where applicable cautionary or other information is to be found. For maximum input voltage see Table 6-1.

As Marked on Equipment

ff DANGER—High voltage.

Protective ground (earth) terminal.

ATTENTION—Refer to manual.

vin

2465B/2455B/2445B Operators

Operators Safety Summary

Power Source

This product is intended to operate from a power source that does not apply more than 250 volts rms between the supply conductors or between either supply conductor and ground. A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation.

Grounding

the

Product

This product is grounded through the grounding conductor of the power

cord.

To avoid electrical shock, plug the power cord into a properly wired receptacle before connecting to the product input or output terminals. A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation.

Danger Arising From Loss

Ground

Upon loss of the protective-ground connection, all accessible conductive parts (including knobs and controls that may appear to be insulating) can render an electric shock.

Use the

Proper Power Cord

Use only the power cord and connector specified for your product.

Use only a power cord that is in good condition.

For detailed information on power cords and connectors see Table 1-1.

Use the

Proper Fuse

To avoid fire hazard, use only a fuse of the correct type, voltage rating and current

rating as specified in the parts list for your product.

Do Not

Operate

Explosive Atmospheres

To avoid explosion, do not operate this product in an explosive atmosphere unless

it has been specifically certified for such operation.

Do Not

Remove Covers

Panels

To avoid personal injury, do not remove the product covers or panels. Do not

operate the product without the covers and panels properly installed.

2465B/2455B/2445B Operators

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TO AVOID ELECTRIC SHOCk

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CONNECTED

GROUND

NOT

REMOVE COVERS. RtfER SERVICING

QUALIFIED PERSONNEL. DISCONNECT INPUT POWER DtfORE REPLACING fUSfc. KIR CONTINUED TIRi PROTECTION REPLACE, ONLY

WITH SPECIFIED TYPE

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Manual Part No. 070-6860-00 First Printing MAY 1988

Prnrinct- 2445B/2455B/2465B Operators Revised OCT 1990

Manual Insert Status

Date Change Refersnc© Ststu

JUL90 M73008 Effective

r «M »%• W

Pagel of 1

•

* * K •■ ■ « »

MANUAL UMANUt INhUHMAI

IUN

COLMTTED

BCH1EN3E

leKtronix

Date:

07-05-90 Change Reference: M73006

Product: 2465B/2455B/2445B Operators Manual Part Number: 070-6860-00

DESCRIPTION Product Group 38

EFFECTIVE SERIAL NUMBERS: 2445B B0600000

PAGE!

Change the first and second paragraphs to:

The TEKTRONIX

2465B, 2455B,

and 2445B portable oscilloscopes have four

vertical channels with DC to 400

MHz,

250

MHz,

and 200 MHz bandwldths...

The trigger systems work automatically for most

signals.

They operate

various

modes,

from any

channel,

with couplings for a wide range of

signals.

The 2445B

triggers from

to 300

MHz.

The 2455B and 2465B trigger

from

DC to 500 MHz.

PAGE

6-3,6-5,

and 6-6

Change the 2445B Vertical Deflection System— Channel 1 and Channel 2, and Vertical Deflection System— Channel 3 and Channel 4 specifications to:

-3 dB Bandwidth 2445B

+ 15°Cto+35°C DC to 200 MHz.

—15°C to +15°C and DC to 175 MHz.

+35°Cto+55°C

-4.7 dB Bandwidth 2445B

+15°Cto+35°C DC to 200 MHz.

—15°C to +15°C and DC to 175 MHz. +35°C to +55°C

Step Response Rise Time

2445B

Page 1 of

<1.75ns.

Product: 2465B/2455B/2445B Oper Date: JJZ=G5=:9Ghange

Reference:

M73QQ9

PAGE 6-7 and 6-8

Change the 2445B Triggering specifications to:

Minimum P-P Signal Amplitude for Stable Triggering from Channel 1 or

Channel

2 Source

2445B

Coupled

NOISE REJ Coupled

Coupled

LF REJ

Coupled

Jitter

2445B

0.35 division from dc to 50 MHz; increasing to 1.0 division at 200 MHz and 1.5 divisions at 300 MHz.

<1.2 divisions from dc to

MHz; increasing to 3.0 divisions at 200 MHz and 4.5 divisions at

300

MHz.

0.35 division from 60 Hz to

MHz;

increasing to 1.0 division

at 200

MHz

and 1.5 divisions at

300

MHz.

Attenu-

ates signals below

Hz.

0.50 division from 80 kHz to

MHz; increasing to 1.0 division at 200 MHz and 1.5 divisions at 300 MHz.

<100 ps with 5 divisions of 200 MHz

at 1 ns/division.

PAGE 7-3

Change the 2445B Standard Accessories to:

2 Probes (1 OX, 1,3m) with Accessories

PAGE 7-5

Change the 2445B Standard Accessories to:

Probe Package

P6137

Page 2 of

General Information

Preparation

for

Use

Safety

Before connecting the oscilloscope to a power source, read entirely both this section and the Safety Summary at the front of this manual. Be sure you have the training required to safely connect the instrument inputs to the signals you will be measuring. Refer to the Safety Summary for power source, grounding, and other safety considerations pertaining to the use of the instrument.

Line

Voltage

Selection

This instrument may be damaged if operated with the LINE VOLTAGE SELECTOR switch set for the wrong applied ac input-source voltage or if the vsrong tine fuse is installed.

The oscilloscope operates from either a 115-V or a 230-V nominal ac power-line

with any frequency from 48 Hz to 440 Hz. Before connecting the power cord to a power source, verify that the LINE VOLTAGE SELECTOR switch, located on the rear panel (see Figure 1 -1), is set correctly (see Table 1-1) and that the line fuse is correct. To convert the instrument for operation on the other line-voltage range, move the LINE VOLTAGE SELECTOR switch to the correct nominal ac source-voltage setting. The detachable power cord may have to be replaced to match the particular power source.

Line Fuse

To verify the instrument power-input fuse rating, do the following steps:

Press the fuse-holder cap and release it with a slight counterclockwise

rotation.

Pull the cap (with the attached fuse inside) out of the fuse holder.

Verify that the fuse is of the type listed on the back of the instrument. Then

install the proper fuse and reinstall the proper fuse-holder cap. The two types of fuses listed are not directly interchangeable; they require different types of fuse caps. For international power cord options, a 5x20 mm fuse holder cap is included in the accessory pouch for use with 1.6 A, 250 V, 5x20 mm (IEC 127) fuses (not supplied).

2465B/2455B/2445B Operators

1-1

General Information

Table 1-1

Power Cord and Voltage Data

Plug

Configuration

Option

U.S.

Std.

Power Cord/

Plug Type

U.S.

120 V

EURO

220 V

240 V

Australian

240 V

North

American

240 V

Switzerland

220 V

Line Voltage

Selector

115V

230V

Reference

Standards'

ANSIC73.11 NEMA

5-15-P

IEC83

UL 198.6

CEE(7), II, IV, VII

IEC83

IEC 127

BS 1363

IEC 83

IEC 127

ASC112

IEC 127

ANSI C73.20

NEMA

6-15-P

IEC 83

UL 198.6

SEV

IEC 127

A 6A, type C fuse is also installed inside the plug of the Option A2 power

cord.

Reference Standards Abbreviations:

ANSI—American National Standards Institute AS—Standards Association of Australia BS—British Standards Institution CEE—International Commission on Rules for the Approval of Electrical Equipment IEC—International Electrotechnical Commission NEMA—National Electrical Manufacturer's Association SEV—Schweiiervischer Elektrotecfmischer Verein

UL—Underwriters Laboratories Inc.

1-2 2465B/2455B/2445B Operators

General Information

Figure 1-1. Line selector switch, line fuse, and detachable power cord.

Power

Cord

This instrument has a detachable, three-wire power cord with a three-contact

plug for connection to both the power source and protective ground. The power

cord is secured to the rear panel by a cord-set-securing clamp. The protective-

ground contact on the plug connects through the power-cord to the external metal parts of the instrument. For electrical-shock protection, insert this plug into a power-source outlet that has a properly grounded protective-ground contact.

Instruments are shipped with the required power cord as ordered by the

customer. Available power-cord information is presented in Table 1-1, and part

numbers are listed in "Options and Accessories" (Section 7). Contact your Tektronix representative or iocai Tektronix Fieid Office for additional power-cord information.

2465B/2455B/2445B Operators

1-3

General Information

Instrument Cooling

To prevent instrument damage from internally generated heat, adequate air flow must be maintained. Before turning on the power, verify that the spaces around the air-intake holes on the bottom of the cabinet and the fan-exhaust holes in the rear panel are free of any obstruction to airflow.

Start-up

The oscilloscope automatically performs a set of diagnostic tests each time the instrument is turned on. These tests warn the user of any available indication that the instrument may not be fully functional. The tests run for several seconds after power is applied. If no faults are encountered, the instrument operates normally. A failure of any of the power-up tests will be indicated by either a flashing TRIG'D indicator on the instrument front panel or a bottom-line readout on the CRT in the form:

TEST XX FAIL YY (where XX is the test number and YY is the failure code

of the failed test).

If a failure of any power-up test occurs, the instrument may still be usable for

some applications. To operate the instrument after a power-up test failure, press

the A/B TRIG button. Even if the instrument then functions for your particular

measurement requirement, it should be repaired by a qualified service technician at

the earliest convenience. Additional information on the power-up tests may be

found in Appendix C at the rear of this manual. Consult your service department,

your local Tektronix Service Center, or nearest Tektronix representative if additional assistance is needed.

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2465B/2455B/2445B Operators

General Information

Repackaging

For

Shipment

If this instrument is to be shipped by commercial transportation, it should be packaged in the original manner. The carton and packaging material in which your instrument was shipped to you should be retained for this purpose.

If the original packaging is unfit for use or is not available, repackage the instrument as follows:

Obtain a corrugated cardboard shipping carton having inside dimensions at

least six inches greater than the instrument dimensions and having a carton test strength of at least 275 pounds.

If the instrument is to be shipped to a Tektronix Service Center for service or

repair, attach a tag to the instrument showing the following: owner of the

instrument (with address), the name of a person at your firm who can be

contacted,

complete instrument type and serial number, and a description of

the service required.

3. Wrap the instrument with polyethylene sheeting or equivalent to protect the outside finish and prevent entry of packing materials into the instrument.

Cushion the instrument on all sides by tightly packing dunnage or urethane

foam between the carton and the instrument, allowing three inches on each side.

5. Seal the carton with shipping tape or with an industrial stapler.

6. Mark the address of the Tektronix Service Center and your return address on the carton in one or more prominent locations.

2465B/2455B/2445B Operators

1-5

Operation

Fundamentals

Like any oscilloscope, this instrument draws a graph of voltage as a function of

time.

The VERTICAL controls, marked off by a heavy gray line, define the voltage axis of the display. SEC/DIV, XI0 MAG, and horizontal POSITION control the time axis of the display. The TRIGGER controls, marked off by a green box, define the signals required to initiate sweeps across the time axis. The controls under the CRT affect the display but not the waveform.

Parametric Measurements

The Parametric Measurement function provided in the instrument gives quick

access to the parameters of your input signal.

To obtain a parametric measurement, simply press the MEASURE button and select the desired function from the displayed menu. The function is selected by pressing the button in the VERTICAL MODE area that occupies the same relative

position as the desired menu selection. The measurement function will automatically scale the input signal before making the measurement.

Parametric measurements require repetitive signals for reliable results.

Measurements on non-repetitive signals will produce unpredictable results.

Repetitive signals that have periodic bursts of signal transitions will also produce unpredictable results.

Parametric measurements can only be performed on signals in CH 1 or CH 2.

An error message will be displayed if CH 3, CH 4, or ADD are selected for

parametric measurements.

2465B/2455B/2445B Operators

REV NOV 1988

2-1

Operation

Getting a Display

Connect a probe from the input of a Vertical channel to a signal.

Select the channel using the Vertical MODE buttons. You may select any

combination of vertical channels. (If you are using the standard accessory probes, make sure the CH 1 and CH 2 input are not set at 50 IX)

3. Press AUTO Setup to initialize vertical, horizontal, trigger, and display intensity for a usable display. (If STEP is illuminated, first push RECALL to extinguish it.)

If the resulting display isn't exactly what you want, adjust the appropriate

VOLTS/DIV, SEC/DIV, POSITION, or Trigger controls.

Characteristics of AUTO Setup

With one channel. Auto Setup centers the 0-volt level and makes the vertical display as large as possible, within the graticule. With more than one channel, the 0-volt levels of CH 1. CH 2, CH 3. and CH 4 are set at +2. 0. -2, and -3 divisions from center, respectively. When ADD is displayed, the 0-volt level of CH 2 is set at

-2 divisions.

AUTO sets Sec/Div within the range from 20 ns to 2 ms, to show two to five cycles of most signals. With narrow, low repetition-rate pulses, the sweep runs faster to stretch out the display, with the appropriate trigger slope.

AUTO Setup sets the trigger for Auto Lvl Mode, Vert Source, DC Coupling, and Min Holdoff, with level at the midpoint between signal peaks.

The STEP/AUTO EXT SWITCH connector on the rear panel produces the same functions as the STEP/AUTO button, in response to a switch closure or TTL-low signal.

The following function is available for instruments with serial numbers B049999 and below with firmware version 11 and above or for instruments with serial numbers B050000 and above with firmware version 2 and above (see Appendix A - EXER04 to determine firmware version). AUTO Setup can also be

activated by pressing any probe ID button if configured to perform an AUTO Setup using the PROBE Configure menu. The operator can configure the probe ID to

perform one of four possible outcomes (IDENT, AUTO Setup. INIT@50%, or STEP). Once configured, the instrument will maintain the selection until modified again by

the operator.

The following function is available for instruments with serial numbers

B049999 and below with firmware version 10 and below or for instruments with serial numbers B050000 and above with firmware version 1 and below (see Appendix A - EXER04 to determine firmware version). AUTO Setup can also be

activated by pressing any probe ID button twice in 0.5 second.

See "Save and Recall Operation" for the sequence function of Step/Auto.

2-2 2465B/2455B/2445B Operators

Operation

Assigning Parametric Measurements to the Auto Setup Function

Any of the Parametric Measurements can be assigned to the Auto Setup

function.

When Auto Setup is activated, the assigned function is performed as

well as the Auto Setup.

To assign a function to Auto Setup:

i. Push MEASURE.

If the CTT is present, select MORE from the menu. Otherwise go to

Step 3.

NOTE

select items from a menu, simply press the vertical mode button that

has the same position as the desired item in the menu.

3. Select CONFIGURE from the menu.

Select

AUTO

from the menu.

5. Select the function to be performed with each Auto Setup by pushing the appropriate MODE button.

Activating AUTO Setup from the Probe

identification button on any Tektronix, Inc. probe will shift the associated trace and replace the associated scale factor with ID, if IDENT has been selected from the PROBE CONFIGURE menu.

AUTO Setup, INIT@50% or STEP can also be assigned to the probe ID function.

To assign a function to probe ID:

Push MEASURE

If CTT is present, select MORE from the menu. Otherwise, go to

Step 3.

2465B/2455B/2445B Operators

2-3

+ 177 hidden pages

Tektronix 2445B, 2455, 2465B Operator's Manual

Specifications and Main Features

Frequently Asked Questions

User Manual