Tektronix TDS 820 Manual de utilizare

Performance Verification

TDS 820

Digitizing Oscilloscope

070-8696-00

Please check for change information at the

rear of this manual.

First Printing: February 1993

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.

patents, issued and pending. The following are registered trademarks: TEKTRONIX, TEK, TEKPROBE, and

SCOPE-MOBILE.

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, or will provide a replacement in exchange for the defective product.

In order to 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 is 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 a) 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 DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED 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 OF SUCH DAMAGES.

TDS 820 Performance Verification

Preface

This is the Performance Verification for the TDS 820 Oscilloscope. It contains

procedures suitable for determining if the instrument functions, was adjusted

properly, and meets the performance characteristics as warranted.

Also contained in this document is a copy of the

Specification

found in Appen-

dix B of the

TDS 820 User Manual

. It is included here as a convenient refer-

ence.

The following documents are related to the use or service of the digitizing

oscilloscope.

The

TDS 820 User Manual

.

The

TDS 800 Series Family Programmer Manual

describes using a

computer to control the digitizing oscilloscope through the GPIB interface.

The

TDS 820

Reference

gives you a quick overview of how to operate

your digitizing oscilloscope.

The

TDS 820 Service Manual

provides information for maintaining and

servicing your digitizing oscilloscope to the module level.

The

TDS Family Option 2F Instruction Manual

describes use of the

Advanced DSP Math option (for TDS oscilloscopes equipped with that

option only).

The

TDS Family Option 13 Instruction Manual

describes using the option-

al Centronic

TDS

oscilloscopes equipped with that option only).

Related Manuals

Preface

TDS 820 Performance Verification

Contents

Safety v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performance Verification

Procedures

Brief Procedures 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Instructions 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Conventions 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Self Tests 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Verify Internal Adjustment, Self Compensation, and

Diagnostics 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Functional Tests 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Verify All Input Channels 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Verify the Time Base 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Verify the Trigger System 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performance Tests 1-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Prerequisites 1-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Required 1-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Test Record 1-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Signal Acquisition System Checks 1-17. . . . . . . . . . . . . . . . . . . . . . . .

Check Accuracy of Net Offset 1-17. . . . . . . . . . . . . . . . . . . . . . . . . . .

Check Voltage Measurement Accuracy 1-21. . . . . . . . . . . . . . . . . . .

Check Rise Time 1-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check Input Resistance 1-29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Time Base System Checks 1-31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check Accuracy of Delta Time Measurement Between

Channels 1-31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check Accuracy of Single Channel Delta Time

Measurements 1-35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Trigger System Checks 1-42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check Accuracy, Trigger-Level 1-42. . . . . . . . . . . . . . . . . . . . . . . . . .

Sensitivity, Trigger, External, CH 1, and CH 2 1-45. . . . . . . . . . . . .

Check Trigger Delay Jitter and Random Noise 1-48. . . . . . . . . . . .

Contents

Specifications

Product Description 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Nominal Traits 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Warranted Characteristics 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performance Conditions 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Typical Characteristics 2-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TDS 820 Performance Verification

Safety

Please take a moment to review these safety precautions. They are for your

protection and to prevent damage to the digitizing oscilloscope. This safety

information applies to all operators and service personnel.

These two terms appear in manuals:

statements identify conditions or practices that could result in

damage to the equipment or other property.

statements identify conditions or practices that could result in

personal injury or loss of life.

These two terms appear on equipment:

CAUTION

indicates a personal injury hazard not immediately accessible

as one reads the marking, or a hazard to property including the equip-

ment itself.

DANGER

indicates a personal injury hazard immediately accessible as

one reads the marking.

This symbol appears in manuals:

Static-Sensitive Devices

These symbols appear on equipment:

DANGER

High Voltage

Protective

ground (earth)

terminal

ATTENTION

Refer to

manual

Symbols and Terms

Safety

Observe all of these precautions to ensure your personal safety and to pre-

vent damage to either the digitizing oscilloscope or equipment connected to it.

Power Source

The digitizing oscilloscope operates from a power source that will not apply

more than 250 V

rms

between the supply conductors or between either supply

conductor and ground. A protective ground connection, through the grounding

conductor in the power cord, is essential for safe system operation.

Grounding the Digitizing Oscilloscope

The digitizing oscilloscope is grounded through the power cord. To avoid

electric shock, plug the power cord into a properly wired receptacle where

earth ground has been verified by a qualified service person. Do this before

making connections to the input or output terminals of the digitizing oscillo-

scope.

Without the protective ground connection, all parts of the digitizing oscillo-

scope are potential shock hazards. This includes knobs and controls that may

appear to be insulators.

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.

Use the Proper Fuse

To avoid fire hazard, use only the fuse specified in the parts list for your

product, matched by type, voltage rating, and current rating.

Do Not Remove Covers or Panels

To avoid personal injury, do not operate the digitizing oscilloscope without the

panels or covers.

Take Antistatic Precautions

Wear an antistatic grounding wrist strap when working with the input connec-

tors on the digitizing oscilloscope.

Electric Overload

Never apply to a connector on the digitizing oscilloscope a voltage that is

outside the range specified for that connector.

Specific Precautions

Safety

TDS 820 Performance Verification

Do Not Operate in Explosive Atmospheres

The digitizing oscilloscope provides no explosion protection from static dis-

charges or arcing components. Do not operate the digitizing oscilloscope in

an atmosphere of explosive gases.

Safety

Performance Verification

Procedures

TDS 820 Performance Verification

Brief Procedures

The

Self Tests

use internal routines to confirm basic functionality and proper

adjustment. No test equipment is required to do these test procedures.

The

Functional Tests

utilize the 1 MHz Test Signal output at the rear panel as

a test-signal source for further verifying that the oscilloscope functions

properly. Standard-accessory SMA cables, included with this oscilloscope, are

the only equipment required.

Besides the

Brief Procedures,

the set of procedures that can be used to verify

oscilloscope performance includes the

Performance Tests,

found later in this

section. You may not need to perform all of these procedures, depending on

what you want to accomplish:

To rapidly confirm that this oscilloscope functions and was adjusted

properly, just do the procedures under

Self Tests

, which begin on

page 1-3.

Advantages: These procedures are quick to do, require no external

equipment or signal sources, and perform extensive functional and accu-

racy testing to provide high confidence that the oscilloscope will perform

properly. They can be used as a quick check before making a series of

important measurements.

To further check functionality, first do the

Self Tests

just mentioned; then

do the procedures under

Functional Tests

that begin on page 1-5.

Advantages: These procedures require minimal additional time to per-

form, require no additional equipment other than standard-accessory

SMA cables, and more completely test the internal hardware of this

oscilloscope. They can be used to quickly determine if the oscilloscope is

suitable for putting into service, such as when it is first received.

If more extensive confirmation of performance is desired, do the

Perfor-

mance Tests

, beginning on page 1-11, after doing the

Functional

and

Self

Tests

just referenced.

Advantages: These procedures add direct checking of warranted specifi-

cations. They require more time to perform and suitable test equipment is

required. (See

Equipment Required

on page 1-12.)

If you are not familiar with operating this oscilloscope, read

General Operating

Instructions

in Section 3 of this manual. These instructions will acquaint you

with the use of the front-panel controls and the menu system.

If you are not familiar with operating this oscilloscope, read

At a Glance

in

Section 2 of the

TDS 820

User Manual

.

General Instructions

Brief Procedures

Appendix C: Performance Verification

Performance Verification

Throughout these procedures the following conventions apply:

Tighten all SMA connectors to 8.5 inch pounds (0.96 N · m).

Each test procedure uses the following general format:

Title of Test

Equipment Required

Prerequisites

Procedure

Each procedure consists of as many steps, substeps, and subparts as

required to do the test. Steps, substeps, and subparts are sequenced as

follows:

1. First Step

a. First Substep

First Subpart

Second Subpart

b. Second Substep

2. Second Step

In steps and substeps, the lead-in statement in italics instructs you what

to do, while the instructions that follow tell you how to do it: in the exam-

ple step below,

“Initialize the oscilloscope”

by doing “Press save/recall

SETUP. Now, press the main-menu button.”

Initialize the oscilloscope:

Press save/recall SETUP. Now, press the

main-menu button Recall Factory Setup; then the side-menu button

OK Confirm Factory Init.

Where instructed to use a front-panel button or knob, or select from a

main or side menu, or verify a readout or status message, the name of

the button or knob appears in boldface type: “press SHIFT; then AC-

QUIRE MENU”, “press the main-menu button Slope”, or “verify that the

status message is

Pass

”.

The symbol at the left is accompanied by information you must read

to do the procedure properly.

Conventions

Brief Procedures

Appendix C: Performance Verification

TDS 820 Performance Verification

Refer to Figure 1-1: “Main menu” refers to the menu that labels the seven

menu buttons under the display; “side menu” refers to the menu that

labels the five buttons to the right of the display. “Pop-up menu” refers to

a menu that pops up the when a main-menu button is pressed.

Brief Status

Information

Position of Waveform

Record Relative to

the Screen and Display

General Purpose

Knob Readout

Waveform Reference

Symbols: Ground Levels

and Waveform Sources

Graticule and Waveforms

Side menu area.

Readouts for

measurements

move here when

CLEAR MENU is

pressed.

Main menu display area. Readouts in

lower graticule area move here when

CLEAR MENU is pressed.

Pop-up Menu

Vertical Scale,

Horizontal Scale, and

Trigger Level Readouts

Figure 1-1: Map of Display Functions

This procedure uses internal routines to verify that this oscilloscope functions

and was adjusted properly. No test equipment or hookups are required.

Verify Internal Adjustment, Self Compensation, and

Diagnostics

Equipment Required:

None.

Prerequisites:

Power up the digitizing oscilloscope and allow a 20 minute

warm-up before doing this procedure.

Self Tests

Brief Procedures

Appendix C: Performance Verification

Performance Verification

Procedure:

1.

Verify that internal diagnostics pass:

Do the following substeps to verify

passing of internal diagnostics.

a.

Display the System diagnostics menu:

Press SHIFT; then press UTILITY.

Repeatedly press the main-menu button System until Diag/Err is

highlighted in the pop-up menu.

b.

Display the Area diagnostics menu:

Repeatedly press the main-menu

button Area until All is highlighted in the pop-up menu.

Remove all input signals from the inputs.

c.

Run the System Diagnostics:

Press the main-menu button Execute;

then press the side-menu button OK Confirm Run Test.

d.

Wait:

The internal diagnostics do an exhaustive verification of proper

oscilloscope function. When finished, the resulting status will appear

on the screen.

e.

Confirm no failures are found:

Verify that no failures are found and

reported on-screen.

First, the CAL menu is displayed.

Second, a signal path

compensation is run

and is verified.

Figure 1-2: Verifying Adjustments and Signal-Path Compensation

f.

Run the signal-path compensation:

Press SHIFT; then press UTILITY.

Brief Procedures

Appendix C: Performance Verification

TDS 820 Performance Verification

Press the main menu button System until Cal is highlighted in

the pop-up menu.

Press the main-menu button Comp All; then press the side-

menu button OK Compensate All.

g.

Wait:

Signal-path compensation runs in about thirty seconds. While it

progresses, a “clock” icon (shown at left) is displayed on-screen.

When compensation completes, the status message will be updated

to

Pass

or

Fail

in the main menu (see step h).

h.

Confirm signal-path compensation returns passed status:

Verify the

word

Pass

appears under Comp All in the main menu. (See Fig-

ure 1-2.)

2.

Return to regular service:

Press CLEAR MENU to exit the system me-

nus.

The purpose of these procedures is to confirm that this oscilloscope functions

properly. The only equipment required is one of the standard-accessory SMA

cables.

These procedures verify functions; that is, they verify that oscillo-

scope features

operate

. They do

not

verify that they operate within

limits.

Therefore, when the instructions in the functional tests that follow call

for you to verify that a signal appears on-screen “that is about five

divisions in amplitude” or “has a period of about six horizontal divi-

sions”, etc., do

NOT

interpret the quantities given as limits. Operation

within limits is checked in

Performance Tests

, which begin on

page 1-11.

DO NOT make changes to the front-panel settings that are not called

out in the procedures. Each verification procedure will require you to

set the oscilloscope to certain default settings before verifying func-

tions. If you make changes to these settings, other than those called

out in the procedure, you may obtain invalid results. In this case, just

redo the procedure from step 1.

When you are instructed to press a menu button, the button may

already be selected (its label will be highlighted). If this is the case, it

is not necessary to press the button.

Verify All Input Channels

Equipment Required:

Three SMA cables and a T connector.

Prerequisites:

None.

Procedure:

1.

Install the test hookup and preset the oscilloscope controls:

Functional Tests

Brief Procedures

Appendix C: Performance Verification

Performance Verification

SMA T

Connector

Antistatic Grounding

Wrist Strap

To 1 MHz TEST

SIGNAL OUTPUT

on Rear Panel

Figure 1-3: Universal Test Hookup for Functional Tests

Inputs to this oscilloscope can be damaged by static discharge.

Wear your antistatic wrist strap whenever making connections the

oscilloscope.

a.

Hook up the signal source:

Connect one end of an SMA cable to the

1 MHz TEST SIGNAL OUTPUT on the rear panel. Connect the other

end of the cable to the T connector. Connect the T connector, through

SMA cables, to the CH 1 input and the EXT TRIGGER INPUT on the

front panel.

b.

Initialize the oscilloscope:

Press save/recall SETUP.

Press the main-menu button Recall Factory Setup.

Press the side-menu button OK Confirm Factory Init.

2.

Verify that all input channels operate:

Do the following substeps — test

CH 1 first,

skipping substep

a since CH 1 is already set up for verification

from step 1.

a.

Select an unverified channel:

Press WAVEFORM OFF to remove from display the channel just

verified.

Press the front-panel button that corresponds to the channel you

are to verify.

Move the SMA cable to the channel you selected.

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Tektronix TDS 820 Manual de utilizare

Tektronix TDS 820 Manual de utilizare

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