Tektronix TDS420A Reference Guide

Technical Reference

TDS 420A, TDS 430A & TDS 460A
Digitizing Oscilloscopes
Performance Verification and Specifications

070-9705-04

www.tektronix.com

Copyright © Tektronix, Inc. All rights reserved.

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privi leges reserved.

Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

WARRANTY

Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship
for a period of three (3) years from the date of shipment. If a 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 al l shipping cha rges, 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 a nd 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; c) to repair any damage or malfunction
caused by the use of non-Tektronix supplies; or d) 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 IN LIEU OF ANY OTHER WARRANTIES, EXPRESS 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, INCIDENT AL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE
OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH
DAMAGES.

Table of Contents

General Safety Summary v...................................

Preface vii...................................................

Performance Verification

Performance Verification Procedures 1--1.........................

Brief Procedures 1--5...........................................

Self Tests 1--5.......................................................

Functional Tests 1--7.................................................

Performance Tests 1--15.........................................

Prerequisites 1--15....................................................

Equipment Required 1--16..............................................

Test Recor d 1--18.....................................................

Signal Acquisition System Checks 1--20...................................

Time Base System Checks 1--34.........................................

Trigger System Checks 1--38............................................

Output Signal Check 1--53..............................................

Sine Wave Generator Leveling Procedure 1--55.............................

Specifications

Specification 2--1..............................................

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

Warranted Characteristics 2--11..................................

Typical Characteristics 2--19.....................................

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

i

Table of Contents

List of Figures

Figure 1--1: Map of Display Functions 1--3........................

Figure 1--2: Verifying Adjustments and Signal Path Compensation 1--6

Figure 1--3: Universal Test Hookup for Functional Tests 1--8.........

Figure 1--4: Initial Test Hookup 1--20..............................

Figure 1--5: Initial Test Hookup 1--23..............................

Figure 1--6: Initial Test Hookup 1--26..............................

Figure 1--7: Measurement of Analog Bandwidth 1--29................

Figure 1--8: Initial Test Hookup 1--31..............................

Figure 1--9: Measurement of Channel Delay 1--33....................

Figure 1--10: Initial Test Hookup 1--34.............................

Figure 1--11: Measurement of Accuracy — Long-Term and

Delay-Time 1--37............................................

Figure 1--12: Initial Test Hookup 1--38.............................

Figure 1--13: Initial Test Hookup 1--41.............................

Figure 1--14: Measurement of Trigger Sensitivity 1--43...............

Figure 1--15: Initial Test Hookup 1--45.............................

Figure 1--16: Confirming Auxiliary Triggering at Maximum

Triggering Frequency 1--46...................................

Figure 1--17: Initial Test Hookup 1--47.............................

Figure 1--18: Initial Test Hookup 1--49.............................

Figure 1--19: Adjusting Sync Pu lse Amplitude 1--51..................

Figure 1--20: Measurement of Video Sensitivity 1--52.................

Figure 1--21: Initial Test Hookup 1--54.............................

Figure 1--22: Measurement of Probe Compensator Limits 1--55........

Figure 1--23: Sine Wave Generator Leveling Equipment Setup 1--56....

Figure 1--24: Equipment Setup for maximum Amplitude 1--57.........

Figure 2--1: TDS 400A Dimensional Drawing 2--9...................

ii

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

List of Tables

Table of Contents

Table 1--1: Test Equipment 1--16.................................

T able 1--2: DC Offset Accuracy 1--22..............................

Table 1--3: Analog Bandwidth (TDS 420A) 1--27....................

Table 1--4: Analog Bandwidth (TDS 430A and TDS 460A) 1--28.......

Table 2--1: Key Features of the TDS 400A Oscilloscopes 2--1.........

Table 2--2: Nominal Traits — Signal Acquisition System 2--3.........

Table 2--3: Nominal Traits — Time Base System 2-- 5...............

Table 2--4: Nominal Traits — Triggering System 2--5...............

Table 2--5: Nominal Traits — Display System 2--6..................

Table 2--6: Nominal Traits — Data Storage 2--6....................

Table 2--7: Nominal Traits — GPIB Interface, Video Output, and

Power Fuse 2--6...........................................

Table 2--8: Nominal Traits — Mechanical 2--7.....................

T able 2--9: Warranted Characteristics — Signal Acquisition System 2--11

T able 2--10: Warranted Characteristics — Time Base System 2--13.....

T able 2--11: Warranted Characteristics — Triggering System 2--14.....

T able 2--12: Warranted Characteristics — Probe Compensator

Output 2--14...............................................

T able 2--13: Warranted Characteristics — Power Requirements 2--14..

T able 2--14: Warranted Characteristics — Environmental, Safety,

and Reliability 2--15........................................

Table 2--15: Certifications and compliances 2--16....................

T able 2--16: Typical Characteristics — Signal Acquisition System 2--19.

T able 2--17: Typical Characteristics — Time Base System 2--20........

T able 2--18: Typical Characteristics — Triggering System 2--21.......

T able 2--19: Typical Characteristics — Data Handling 2--22..........

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

iii

Table of Contents

iv

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

General Safety Summary

Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.

To avoid potential hazards, use this product only as specified.

Only qualified personnel should perform service procedures.

Injury Precautions

Use Proper Power Cord. To avoid fire hazard, use only the power cord specified
for this product.

Avoid Electric Overload. To avoid electric shock or fire hazard, do not apply a
voltage to a terminal that is outside the range specified for that terminal.

Avoid Electric Shock. To avoid injury or loss of life, do not connect or disconnect
probes or test leads while they are connected to a voltage source.

Ground the Product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.

Do Not Operate Without Covers. To avoid electric shock or fire hazard, do not
operate this product with covers or panels removed.

Use Proper Fuse. To avoid fire hazard, use only the fuse type and rating specified
for this product.

Do Not Operate in Wet/Damp Conditions. To avoid electric shock, do not operate
this product in wet or damp conditions.

Do Not Operate in an Explosive Atmosphere. To avoid injury or fire hazard, do not
operate this product in an explosive atmosphere.

Product Damage

Precautions

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Use Proper Power Source. Do not operate this product from a power source that
applies more than the voltage specified.

Provide Proper Ventilation. To prevent product overheating, provide proper
ventilation.

Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.

v

General Safety Summary

Symbols and Terms

Terms in this Manual. These terms may appear in this manual:

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.

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

DANGER indicates an injury hazard immediately accessible as you read the
marking.

WARNING indicates an injury hazard not immediately accessible as you read the
marking.

CAUTION indicates a hazard to property including the product.

Symbols on the Product. The following symbols may appear on the product:

Certifications and

Compliances

DANGER

High Voltage

Protective Ground

(Earth) Terminal

ATTENTION

Refer to Manual

Refer to the specifications section for a listing of certifications and compliances
that apply to this product.

vi

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Preface

Related Manuals

This is the Performance Verification for the TDS 430A, TDS 420A, and
TDS 460A Oscilloscopes. It contains procedures suitable for determining if the
oscilloscope functions, is adjusted properly, and meets the performance
characteristics as warranted.

This document also contains the specifications for the
TDS 400A Digitizing Oscilloscopes.

The following documents relate to the use or service of the
digitizing oscilloscope:

H The TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual describes

how to operate your digitizing oscilloscope.

H The TDS Family Programmer Manual describes using a computer to control

the digitizing oscilloscope through the GPIB interface.

H The TDS 420A, TDS 430A, TDS 460A & TDS 510A Reference gives you a

quick overview of how to operate your digitizing oscilloscope.

H The TDS 420A, TDS 430A & TDS 460A Service Manual provides informa-

tion for maintaining and servicing your digitizing oscilloscope to the
module level.

H The TDS Family Option 13 Instruction Manual describes using the optional

CentronicsR and RS-232 interfaces for obtaining hard copies (for
TDS oscilloscopes equipped with that option only).

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

vii

Preface

Contacting Tektronix

Phone [phone]*

Address Tektronix, Inc.

Department or name (if known)
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA

Web site www.tektronix.com

Sales support 1-800-833-9200, select option 1*

Service support 1-800-833-9200, select option 2*

Technical support Email: [e-mail]

1-800-833-9200, select option 3*
1-503-627-2400

6:00 a.m. -- 5:00 p.m. Pacific time

* This phone number is toll free in North America. After office hours, please leave a

voice mail message.
Outside North America, contact a Tektronix sales office or distributor; see the
Tektronix web site for a list of offices.

viii

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Verification

Performance Verification Procedures

Two types of Performance V erification procedures can be performed on this
product: Brief Procedures and Performance Tests. You may not need to perform
all of these procedures, depending on what you want to accomplish:

H To rapidly confirm that this oscilloscope functions and is adjusted properly,

just do the procedures under Self Tests, which begin on page 1--5.

Advantages: These procedures are quick to do, require no external
equipment or signal sources, and perform extensive functional and accuracy
testing to provide high confidence that the oscilloscope will perform
properly. Use these procedures as a quick check before making a series of
important measurements.

H To further check functionality, first do the Self Tests just mentioned; then do

the procedures under Functional Tests that begin on page 1--7.

Advantages: These procedures require minimal additional time to perform,
require no additional equipment other than a standard-accessory probe, and
more completely test the internal hardware of this oscilloscope. Use these
procedures to quickly determine if the oscilloscope is suitable for putting
into service, such as when it is first received.

H If more extensive confirmation of performance is desired, do the Perfor-

mance Tests, beginning on page 1--15, after doing the Functional and Self
Tests just referenced.

Advantages: These procedures add direct checking of warranted specifica­tions. They require more time to perform and suitable test equipment is
required. (See Equipment Required on page 1--16.)

Throughout these procedures the following conventions apply:

H Each test procedure uses the following general format:

Title of Test

Equipment Required

Prerequisites

Procedure

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 1

Performance Verification Procedures

H Each procedure consists of as many steps and substeps as required to do the

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

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

test. Steps and substeps are sequenced as follows:

1. First Step

a. First Substep

b. Second Substep

2. Second Step

do, while the instructions that follow tell you how to do it: in the example
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,pressthe
main-menu button Recall Factory Setup; then the side-menu button OK
Confirm Factory Init.

or side menu, or verify a readout or status message, the name of the button or
knob appears in boldface type: “press SHIFT; then ACQUIRE MENU,”
“press the main-menu button Coupling,” or “verify that the status message
is Pass.”

STOP. This symbol is accompanied by information you must read to do
procedures properly.

H 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.

1- 2

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Verification Procedures

Position of Waveform

Record Relative to

the Screen and Display

Waveform Reference

Symbols: Ground Levels

and Waveform Sources

Graticule and Waveforms

Vertical Scale, Horizontal

Scale, and Trigger Level

Readouts

Brief Status
Information

General Purpose

Knob Readout

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.

Figure 1- 1: Map of Display Functions

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 3

Performance Verification Procedures

1- 4

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Brief Procedures

Self Tests

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 use the probe-adjust output at the front panel as a test-
signal source for further verifying that the oscilloscope functions properly. A
standard-accessory probe, included with this oscilloscope, is the only
equipment required.

This procedure uses internal routines to verify that this oscilloscope functions
and passes its internal self tests and signal path compensations. It also confirms
that the oscilloscope was adjusted properly at the time it was last adjusted. No
test equipment or hookups are required.

Verify Internal Adjustment,

Self Compensation, and

Diagnostics

Equipment
Required

Prerequisites Power on the digitizing oscilloscope and allow a 20 minute warm-up

1. Verify that internal diagnostics pass: Do the following substeps to verify that

the internal diagnostics passed.

a. Display the system diagnostics menu:

H Press SHIFT;thenpressUTILITY.

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

highlighted in the menu that pops up.

H Repeatedly press the main-menu button Area until All is highlighted

in the menu that pops up.

b. Run the system diagnostics: Press the main-menu button Execute; then

press the side-menu button OK Confirm Run Test.

c. Wait: The internal diagnostics do an exhaustive verification of proper

oscilloscope function. This verification takes up to two minutes. While it
progresses, a variety of test patterns flash on screen. When finished, the
resulting status appears on the screen.

None

before doing this procedure.

d. Confirm no failures are found: Verify that no failures are found and

reported on screen.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 5

Brief Procedures

e. Confirm the four adjustment sections have passed status:

H Press SHIFT;thenpressUTILITY.

H Press the main menu button System until Cal is highlighted in the

pop-up menu.

H Verify that the word Pass appears in the main menu under the

following menu labels: Voltage Reference, High Frequency
Response, Low Frequency Response,andTrigger Skew.(See
Figure 1--2.)

Display the

CAL menu.

1

23

Run a signal path

compensation and verify

status is Pass.

Verify Pass status for the

adjustment sections.

Figure 1- 2: Verifying Adjustments and Signal Path Compensation

This oscilloscope lets you compensate the internal signal path used to acquire the
waveforms you acquire and measure. By executing the signal path compensation
feature (SPC), you optimize the oscilloscope capability to make accurate
measurements based on the ambient temperature.

1- 6

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Brief Procedures

You must run an SPC anytime you wish to ensure that the measurements you
make are made with the most accuracy possible. You should also run an SPC if
the temperature has changed more than 5_ C since the last SPC was performed.

f. Run the signal path compensation: Disconnect all input signals. Press

the main-menu button Signal Path; then press the side-menu button OK
Compensate Signal Paths.

NOTE. Failure to run the signal path compensation may result in the oscilloscope
not meeting warranted performance levels.

g. Wait: signal path compensation runs in one to three minutes. While it

progresses, a “clock” icon (shown at left) displays on screen. When
compensation completes, the status message updates to Pass or Fail in
themainmenu(seesteph).

h. Confirm signal path compensation returns passed status: Ve rify the

word Pass appears under Signal Path in the main menu. (See
Figure 1--2.)

Functional Tests

2. Return to regular service: Press CLEAR MENU to exit the system menus.

The purpose of these procedures is to confirm that this oscilloscope functions
properly. The only equipment required is one of the standard-accessory probes
and a 3.5

I, 720 K or 1.44 Mbyte floppy disk.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 7

Brief Procedures

STOP. These procedures verify functions; that is, they verify that oscilloscope
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 divisions,” and so forth, do NOT interpret the
quantities given as limits. Operation within limits is checked in Performance
Tes ts, which begin on page 1--15.

DO NOT make changes to the front-panel settings that are not called out in the
procedures. Each verification procedure requires you to set the oscilloscope to
certain default settings before verifying functions. 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

Prerequisites None

One P6138A probe

1. Install the test hookup and preset the oscilloscope controls:

Digitizing Oscilloscope

Figure 1- 3: Universal Test Hookup for Functional Tests

1- 8

a. Hook up the signal source: Install the probe on CH 1. Connect the probe

tip to PROBE ADJ on the front panel; leave the probe
ground unconnected.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Brief Procedures

b. Initialize the oscilloscope:

H Press save/recall SETUP.

H Press the main-menu button Recall Factory Setup.

H 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:

H Press WAVEFORM OFF to remove from display the channel

just verified.

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

to verify.

H Move the probe to the channel you selected.

b. Set up the selected channel:

H Press AUTOSET to obtain a viewable, triggered display in the

selected channel.

H Set the vertical SCALE to 100 mV. Use the vertical POSITION

knob to center the waveform vertically on screen.

H Set the horizontal SCALE to 200 s.

H Press TRIGGER MENU.

H Press the main-menu button Coupling; then press the side menu-

button HF Rej.

c. Verify that the channel is operational: Confirm that the following

statements are true.

H The vertical scale readout for the channel under test shows a setting

of 100 mV, and a square-wave probe-compensation signal about five
divisions in amplitude is on screen. (See F igure 1--1 on page 1--3 to
locate the readout.)

H The vertical POSITION knob moves the signal up and down the

screen when rotated.

H Turning the vertical SCALE knob counterclockwise decreases the

amplitude of the waveform on-screen, turning the knob clockwise
increases the amplitude, and returning the knob to 100 mV returns
the amplitude to about five divisions.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 9

Brief Procedures

d. Verify that the channel acquires in all acquisition modes: Press SHIFT;

then press ACQUIRE MENU. Use the side menu to select, in turn, each
of the five hardware acquire modes and confirm that the following
statements are true. Refer to the icons at the left of each statement as you
confirm those statements.

H Sample mode displays an actively acquiring waveform on screen.

(Note that there is noise present on the peaks of the square wave.)

H Peak Detect mode displays an actively acquiring waveform on

screen with the noise present in Sample mode “peak detected.”

H Hi Res mode displays an actively acquiring waveform on screen

with the noise that was present in Sample mode reduced.

H Envelope mode displays an actively acquiring waveform on screen

with the noise displayed.

H Average mode displays an actively acquiring waveform on screen

with the noise reduced like in Hi Res mode.

Verify the Time Base

e. Test all channels: Repeat substeps a through d until all input channels

are verified.

3. Remove the test hookup: Disconnect the probe from the channel input and

the probe-adjust terminal.

Equipment
Required

Prerequisites None

One P6138A probe

1. Install the test hookup and preset the oscilloscope controls:

a. Hook up the signal source: Install the probe on CH 1. Connect the probe

tip to PROBE ADJ on the front panel; leave the probe ground uncon-
nected. (See Figure 1--3 on page 1--8.)

b. Initialize the oscilloscope:

H Press save/recall SETUP.

H Press the main-menu button Recall Factory Setup; then press the

side-menu button OK Confirm Factory Init.

1- 10

c. Modify default settings:

H Press AUTOSET to obtain a viewable, triggered display.

H Set the horizontal SCALE to 200 s.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Brief Procedures

H Press VERTICAL MENU.

H Press the main-menu button Bandwidth. Then press the side-menu

button 20 MHz.

H Press CLEAR MENU to remove the vertical menu from the screen.

2. Verify that the time base operates: Confirm the following statements.

a. One period of the square-wave probe-compensation signal is about five

horizontal divisions on-screen for the 200 s horizontal scale setting (set
in step 1c).

b. Rotating the horizontal SCALE knob clockwise expands the waveform

on-screen (more horizontal divisions per waveform period), counter­clockwise rotation contracts it, and returning the horizontal scale to
200 s returns the period to about five divisions.

c. The horizontal POSITION knob positions the signal left and right on

screen when rotated.

Verify the Main and

Delayed Trigger Systems

3. Remove the test hookup: Disconnect the probe from the channel input and

the probe-adjust terminal.

Equipment
Required

Prerequisites None

One P6138A probe

1. Install the test hookup and preset the oscilloscope controls:

a. Hook up the signal source: Install the probe on CH 1. Connect the probe

tip to PROBE ADJ on the front panel; leave the probe ground uncon-
nected. (See Figure 1--3 on page 1--8.)

b. Initialize the oscilloscope:

H Press save/recall SETUP.

H Press the main-menu button Recall Factory Setup.

H Press the side-menu button OK Confirm Factory Init.

c. Modify default settings:

H Press AUTOSET to obtain a viewable, triggered display.

H Set the horizontal SCALE for the M (main) time base to 200 s.

H Press VERTICAL MENU.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 11

Brief Procedures

H Press the main-menu button Bandwidth; then press the side-menu

button 20 MHz.

H Press TRIGGER MENU.

H Press the main-menu button Mode & Holdoff.

H Press the side-menu button Normal.

H Press CLEAR MENU to remove the menus from the screen.

2. Verify that the main trigger system operates: Confirm that the following

statements are true.

H The trigger-level readout for the main trigger system changes when

you rotate the trigger MAIN LEVEL knob.

H The trigger-level knob can trigger and untrigger the square-wave

signal as you rotate it. (Leave the signal untriggered.)

H Pressing SET LEVEL TO 50% triggers the signal that you just left

untriggered. (Leave the signal triggered.)

3. Verify that the delayed trigger system operates:

a. Select the delayed time base:

H Press HORIZONTAL MENU.

H Press the main-menu button Time Base.

H Press the side-menu button Delayed Triggerable; then press the

side-menu button Delayed Only.

H Set the horizontal SCALE for the D (delayed) time base to 200 s.

b. Select the delayed trigger-level menu:

H Press SHIFT;thenpressDELAYED TRIG.

H Press the main-menu button Level; then press the side-menu

button Level.

c. Confirm that the following statements are true:

H The trigger-level readout for the delayed trigger system changes

when you rotate the general purpose knob.

H The general purpose knob can trigger and untrigger the square-wave

probe-compensation signal as you rotate it. (Leave the
signal untriggered.)

1- 12

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Brief Procedures

Verify the File System

H Pressing the side-menu

button Set to 50% triggers the probe-com-

pensation signal that you just left untriggered. (Leave the
signal triggered.)

d. Verify the delayed trigger counter:

H Press the main-menu button Delay by Time.

H Press the side-menu button Events, just below the Triggerable after

Time selection.

H Use the General Purpose knob to enter an event count of 325 events.

H Verify that the trigger READY indicator on the front panel flashes

about once every second as the waveform is updated on screen.

4. Remove the test hookup: Disconnect the standard-accessory probe from the

channel input and the probe-adjust terminal.

Equipment
Required

Prerequisites None

One 720 K or 1.44 Mbyte, 3.5 inch DOS compatible disk (formatted).

1. Preset the digitizing oscilloscope controls:

a. Insert the disk in the disk drive.

b. Press save/recall SETUP. Press the main menu button Recall Factory

Setup; then press the side menu button Ok Confirm Factory Init.

c. Set the horizontal SCALE to 200 s (one click clockwise). Notice the

horizontal readout now displays 200 s at the bottom of the screen.

2. Verify the file system works:

a. Press save/recall SETUP. Press the main menu button Save Current

Setup; then press the side menu button To File.

b. Turn the general purpose knob to select the file to save. Choose

TEK?????.SET. With this choice, you will save a file starting with TEK,

then containing five digits, and a

.SET extension. For example, the first

time you run this on a blank, formatted disk or on the Example Programs
Disk, the digitizing oscilloscope will assign the name

TEK00000.SET to

your file. If you ran the procedure again, the digitizing oscilloscope
would increment the name and call the file

TEK00001.SET.

c. Press the side-menu button Save To Selected File.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 13

Brief Procedures

d. Set the horizontal SCALE to 500 s, and then use the vertical POSI-

TION knob to place the channel 1 baseline trace two divisions above

center screen.

e. Press the main menu button Recall Saved Setup; then press the side

menu button From File.

f. Turn the general purpose knob to select the file to recall. For example, if

you followed the instructions above and used a blank disk, you had the
digitizing oscilloscope assign the name TEK00000.SET to your file.

g. Press the side-menu button Recall From Selected File.

h. Verify that the digitizing oscilloscope retrieved the saved setup from the

disk. Do this by noting that the horizontal SCALE again reads 200 s
and the channel 1 baseline waveform is again vertically positioned near
center screens as when you saved the setup.

3. Remove the test hookup: Remove the disk from the disk drive.

1- 14

REV DEC 93

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

This section contains procedures for checking that the TDS 400A Digitizing

Oscilloscopes

The procedures are arranged in four logical groupings: Signal Acquisition System
Checks, Time Base System Checks, Triggering System Checks, and Output Ports
Checks. They check all the characteristics that are designated as checked in

Chapter 2, Specification. (The characteristics that are checked appear in boldface
type under Warranted Characteristics in Chapter 2.) You can use the form at the
end of this section as a test record.

Read Performance Verification Procedures that start on page 1--1. Also, if you
are not familiar with operating this digitizing oscilloscope, read Operating
Information in Chapter 2 of the service manual or read the user manual before
doing any of these procedures.

STOP. These procedures extend the confidence level provided by the basic
procedures described on page 1--5. The basic procedures should be done first,
and then these procedures performed if desired.

perform as warranted.

Prerequisites

The tests in this chapter comprise an extensive, valid confirmation of perfor­mance and functionality when the following requirements are met:

H The cabinet must be installed on the digitizing oscilloscope.

H You must have performed and passed the procedures under Self Tests, found

on page 1--5, and those under Functional Tests, found on page 1--7.

H A signal-path compensation must have been done within the recommended

calibration interval and at a temperature within ±5_ C of the present
operating temperature. (If at the time you did the prerequisite Self Tests, the
temperature was within the limits just stated, consider this prerequisite met.)

H The digitizing oscilloscope must have been last adjusted at an ambient

temperature between +20_ C and +30_ C, must have been operating for a
warm-up period of at least 20 minutes, and must be operating at an ambient
temperature between 5_ C and +40_ C. (The warm-up requirement is usually
met in the course of meeting the prerequisites listed above.)

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 15

Performance Tests

Equipment Required

Table 1- 1: Test Equipment

Item Number and
Description

These procedures use external, traceable signal sources to directly check
warranted characteristics. The test equipment required is shown in Table 1--1.

Minimum Requirements Example Purpose

1. Attenuator,10X
(three required)

2. Attenuator, 5X
(two required)

3. Termination, 50 Ω Impedance 50 Ω; connectors: female

4. Termination, 75 Ω Impedance 75 Ω; connectors: female

5. Cable, Precision Coaxial
(three required)

6. Cable, Coaxial 75 Ω, 36 in, male to male BNC

7. Connector, Dual-Banana
(two required)

8. Connector, BNC “T” Male BNC to dual female BNC Tektronix part number

9. Coupler, Dual-Input Female BNC to dual male BNC Tektronix part number

10. Generator, DC Calibra­tion

11. Generator, Sine Wave 100 kHz to at least 400 MHz. Variable

12. Meter, Level and Power
Sensor

13. Splitter, Power Frequency range: DC to 1 GHz.

14. Generator, Function Frequency range 5 MHz to 10 MHz.

15. Adapter (four required) Male N to female BNC Tektronix 103--0045--00 Checking Analog Bandwidth

Ratio: 10X; impedance 50 Ω; connec­tors: female BNC input, male BNC
output

Ratio: 5X; impedance 50 Ω; connec­tors: female BNC input, male BNC
output

BNC input, male BNC output

BNC input, male BNC output

50 Ω, 36 in, male to male BNC
connectors

connectors

Female BNC to dual banana Tektronix part number

Variable amplitude to ±110 V; accura­cy to 0.1%

p-p

p-p

.

amplitude from 12 m V to 2 V
Frequency accuracy >2.0%

Frequency range:10 MHz to 400MHz.
Amplitude range: 6 mVp-p to 2 V

Tracking: >2.0%

Square wave transition time ≤25 ns.
Amplitude range: 0 to 10 V
into 50Ω

Tektronix part number
011-0059-02

Tektronix part number
011-0060-02

Tektronix part number
011-0049-01

Tektronix part number
011-0102-01

Tektronix part number
012-0482-00

Tektronix part number
012-1338-00

103-0090-00

103-0030-00

067-0525-02

Wavetek 9100 (or, optionally,
Data Precision 8200, with
1 kV option install ed)

Rohde & Schwarz SMY

Rohde & Schwarz URV 35,
with NRV-Z8 power sensor

p-p

Rohde & Schwarz RVZ Checking Analog Bandwidth

Tektronix CFG280 Checking External Clock

Signal Attenuation

Signal Attenuation

Checking delay match be­tween channels

Used to test Video Option 05
equipped oscilloscopes only

Signal Interconnection

Used to test Video Option 05
equipped oscilloscopes only

Various Accuracy Tests

Checking Trigger Sensitivity

Checking Delay Match Be­tween Channels

Checking DC Offset and
Measurement Accuracy

1

Checking Analog Bandwidth,
Trigger Sensitivity, Sample­rate, External Clock, and
Delay-Time Accuracy

Checking Analog Bandwidth
and Trigger Sensitivity

1- 16

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

Table 1- 1: Test Equipment (Cont.)

Item Number and
Description

16. Adapter Female N to male BNC Tektronix 103--0058--00 Checking Analog Bandwidth

17. Probe, 10X included with
this oscilloscope

18. Generator, Video Signal Provides NTSC compatible outputs Tektronix TSG 1001 Checking Video

1

If available, items 11, 12, 13, and 15 can be replaced by a Tektronix SG 503 and SG 504. If available, a TG 501A may be
used to check Sample-rate and Delay-time Accuracy. (A TM 500 or TM 5000 Series Power Module Mainframe is required.)
If using a TG 501A, you may also need a 2X attenuator (50 Ω BNC), Tektronix part number 011-0069-02.

A P6138A probe Tektronix P6138A Signal Interconnection

PurposeExampleMinimum Requirements

Trigger Sensitivity

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 17

Performance Tests

Test Record

Photocopy this page and the next page and use them to record the performance
test results for your oscilloscope.

TDS 400A Test Record

Oscilloscope Serial Number: Certificate Number:
Temperature: RH %:
Date of Calibration: Technician:

Performance Test Minimum Incoming Outgoing Maximum

Offset Accuracy

CH1 Offset +1 V

+10 V
+99.9 V

CH2 Offset +1 V

+10 V
+99.9 V

CH3 Offset +1 V
(TDS 420A & +10 V
TDS 460A) +99.9 V

CH4 Offset +1 V
(TDS 420A & +10 V
TDS 460A) +99.9 V

DC Voltage Measurement Accuracy (Averaged)

CH1 100 mV --20.8 mV __________ __________ +20.8 mV

CH2 100 mV --20.8 mV __________ __________ +20.8 mV

CH3 100 mV (TDS 420A and TDS 460A) --20.8 mV __________ __________ +20.8 mV

CH4 100 mV (TDS 420A and TDS 460A) --20.8 mV __________ __________ +20.8 mV

Analog Bandwidth

CH1 100 mV 424 mV __________ __________ N/A

CH2 100 mV 424 mV __________ __________ N/A

CH3 100 mV (TDS 420A and TDS 460A) 424 mV __________ __________ N/A

CH4 100 mV (TDS 420A and TDS 460A) 424 mV __________ __________ N/A

Time Base System

Delay Between Channels N/A __________ __________ 450 ps

Delta Time @ 20 ns (100 MHz) 9.7 ns __________ __________ 10.3 ns

Long Term Sample Rate/
Delay Time @ 10 ns/100 s

995 mV

9.935 V

99.2505 V

995 mV

9.935 V

99.2505 V

995 mV

9.935 V

99.2505 V

995 mV

9.935 V

99.2505 V

-- 1 . 5 D i v __________ __________ +1.5 Div

__________
__________
__________

__________
__________
__________

__________
__________
__________

__________
__________
__________

__________
__________
__________

__________
__________
__________

__________
__________
__________

__________
__________
__________

+ 1.005 V
+ 10.065 V
+ 100.5495 V

+ 1.005 V
+ 10.065 V
+ 100.5495 V

+ 1.005 V
+ 10.065 V
+ 100.5495 V

+ 1.005 V
+ 10.065 V
+ 100.5495 V

1- 18

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

TDS 400A Test Record (Cont.)

Oscilloscope Serial Number: Certificate Number:
Temperature: RH %:
Date of Calibration: Technician:

Performance Test MaximumOutgoingIncomingMinimum

Trigger System (DC Coupled Threshold)

Main Trigger
Main Trigger — Falling

Main Trigger
Delayed Trigger — Falling

Auxiliary Trigger __________ __________ 10 MHz

External Clock __________ __________ 10 MHz

Probe Compensator Output Signal

Frequency 950 Hz __________ __________ 1050 Hz

Voltage 475 mV __________ __________ 525 mV

-- 1 8 m V

-- 1 8 m V

-- 1 8 m V

-- 1 8 m V

__________
__________

__________
__________

__________
__________

__________
__________

+18 mV
+18 mV

+18 mV
+18 mV

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 19

Performance Tests

Signal Acquisition System Checks

These procedures check those characteristics that relate to the signal-acquisition
system and are listed as checked under Warranted Characteristics in
Chapter 2, Specifications.

Check Offset Accuracy

Equipment
Required

Prerequisites See page 1--15.

Two dual-banana connectors (Item 7)

One BNC T connector (Item 8)

One DC calibrat ion generator (Item 10)

Two precision coaxial cables (Item 5)

1. Install the test hookup and preset the instrument controls:

a. Hook up the test-signal source:

H Set the output of a DC calibration generator to 0 volts.

H Connect the output of a DC calibration generator through a

dual-banana connector followed by a 50 Ω precision coaxial cable to
one side of a BNC T connector (see Figure 1-- 4).

H Connect the Sense output of the generator through a second

dual-banana connector followed by a 50 Ω precision coaxial cable to
the other side of the BNC T connector. Now connect the BNC T
connector to CH 1.

1- 20

Output Sense

DC Calibrator

Dual Banana to

BNC Adapters

50 Ω Coaxial Cables

Digitizing Oscilloscope

BNC T

Connector

Figure 1- 4: Initial Test Hookup

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

b. Initialize the oscilloscope:

H Press save/recall SETUP.

H Press the main-menu button Recall Factory Setup.

H Press the side-menu button OK Confirm Factory Init.

c. Modify the default settings:

H Set the horizontal SCALE to1ms.

H Press SHIFT; then ACQUIRE MENU.

H Press the main-menu button Mode; then press the side-menu

button Hi Res.

H Press DISPLAY.

H Press the main-menu button Graticule; then press the side-menu

button Frame.

H Press MEASURE.

H Press the main-menu button Select Measurement for CHx; then

press the side-menu button Mean. (You will have to press MORE
several times to access the Mean measurement.)

H Press CLEAR MENU.

2. Confirm input channels are within limits for offset accuracy: Do the

following substeps — test CH 1 first, skipping substep a since CH 1 is
already set up to be checked from step 1.

WARNING. High voltages are used in this procedure. Before doing this or any
other procedure in this manual, read the Safety Summary found at the beginning
of this manual.

a. Select an unchecked channel:

H Press WAVEFORM OFF to remove the channel just confirmed

from the display. Then, press the front-panel button that corresponds
to the channel you are to confirm.

H Press MEASURE.

H Press the main-menu button Select Measurement for CHx; then

press the side-menu button Mean. (You will have to press MORE
several times to access the Mean measurement.)

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 21

Performance Tests

Table 1- 2: DC Offset Accuracy

Vertical
Scale Setting

1mV 0 +1 V +1 V ±5mV

100 mV 0 +10 V +10 V ±65 mV

1V 0 +99.9 V +99.9 V ±649.5 mV

Vertical
Position

Offset Setting

Generator
Setting

Offset
Accuracy Limits

b. Set the vertical scale: Set the vertical SCALE to one of the settings

listed in Table 1--2 that is not yet checked. (Start with the first
setting listed.)

c. Set the offset: Press the VERTICAL MENU button and then the Offset

main-menu button. Using the General Purpose knob, set the offset as
dictated by Table 1--2. (Start with the first setting listed.)

d. Set the generator: Set the DC calibration generator to match the vertical

scale as dictated by Table 1--2. (Start with the first setting listed.)

e. Check against limits: Do the following subparts in the order listed.

H Subtract the measured mean from the generator setting. The result is

the offset accuracy

H CHECK that the offset accuracy is within the limits listed for the

current vertical scale setting.

Check DC Voltage

Measurement Accuracy

(Averaged)

H Repeat substeps b through e until all vertical scale settings listed in

Table 1--2 are checked for the channel under test.

f. Test all channels: Repeat substeps a through e for all input channels.

3. Disconnect the hookup:

a. Set the generator output to 0 V.

b. Then disconnect the cable from the generator output at the input

connector of the channel last tested.

Equipment
Required

Prerequisites See page 1--15.

Two dual-banana connectors (Item 7)

One BNC T connector (Item 8)

One DC calibrat ion generator (Item 10)

Two precision coaxial cables (Item 5)

1- 22

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1. Install the test hookup and preset the instrument controls:

a. Hook up the test-signal source:

H Set the output of a DC calibration generator to 0 volts.

H Connect the output of a DC calibration generator through a

dual-banana connector followed by a 50 Ω precision coaxial cable to
one side of a BNC T connector (see Figure 1-- 5).

H Connect the Sense output of the generator through a second

dual-banana connector followed by a 50 Ω precision coaxial cable to
the other side of the BNC T connector. Now connect the BNC T
connector to CH 1.

Performance Tests

Output Sense

DC Calibrator

Dual Banana to

BNC Adapters

Figure 1- 5: Initial Test Hookup

b. Initialize the oscilloscope:

H Press save/recall SETUP.

H Press the main-menu button Recall Factory Setup.

H Press the side-menu button OK Confirm Factory Init.

c. Modify the default settings:

50 Ω Coaxial Cables

Digitizing Oscilloscope

BNC T

Connector

H Press SHIFT and then ACQUIRE MENU.

H Press the main-menu button Mode; then press the side-menu button

Average 16.

H Press DISPLAY.

H Press the main-menu button Graticule; then press the side-menu

button Frame.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 23

Performance Tests

H Press MEASURE.

H Press the main-menu button Select Measurement for CHx; then

press the side-menu button Mean. (You will have to press MORE
several times to access the Mean measurement.)

H Set the vertical SCALE to 100 mV.

H Press the VERTICAL MENU button and then the Offset main-

menu button. Set the offset to 0 V.

H Set the vertical POSITION to0V.

2. Confirm input channels are within limits for DC delta voltage accuracy: Do

the following substeps — test CH 1 first, skipping substep a since CH 1 is
already selected from step 1.

a. Select an unchecked channel:

H Set the generator output to 0 V.

H Press WAVEFORM OFF to remove the channel just confirmed

from the display.

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

are to confirm.

H Press MEASURE.

H Press the main-menu button Select Measurement for CHx; then

press the side-menu button Mean. (You will have to press MORE
several times to access the Mean measurement.)

H Move the test hook up to the channel you select.

H Set the vertical SCALE to 100 mV.

H Set the vertical POSITION to0V.

H Press the VERTICAL MENU button and then the Offset main-

menu button. Set the offset to 0 V.

b. Set the generator: Set the DC calibration generator to +0.35 V.

c. Recor d Measurement: Read the mean at the measurement readout, and

record this number on a piece of scratch paper.

1- 24

d. Set the generator: Set the DC calibration generator to --0.35 V.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

e. Check against limits: Do the following subparts in the order listed.

H Use this formula to calculate voltage measurement accuracy.

700 mV -- (mean from step c -- (present mean))

For example:

700 mV -- (347 mV -- (--358 mV)) = --5 mV

H CHECK that the voltage measurement accuracy is

within ᐔ20.8 mV.

f. Test all channels: Repeat substeps a through e for all channels.

3. Disconnect the hookup:

a. Set the generator output to 0 V.

b. Then disconnect the cable from the generator output at the input

connector of the channel last tested.

Check Analog Bandwidth

Equipment
Required

Prerequisites See page 1--15.

One sine wave generator (Item 11)

One level meter and power sensor (Item 12)

One power splitter (Item 13)

One Female N to Male BNC Adapter (Item 16)

Four Male N to Female BNC Adapters (Item 15)

Two 50 Ω precision cables (Item 5)

Two 10X attenuators (Item 1).

1. Install the test hookup and preset the instrument controls:

a. Initialize the oscilloscope:

H Press save/recall SETUP. Then press the main-menu button Recall

Factory Setup.

H Press the side-menu button OK Confirm Factory Init.

b. Modify the default settings:

H Press TRIGGER MENU.

H Press the main-menu button COUPLING; then press the side menu

button Noise Rej.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 25

Performance Tests

H Press SHIFT; then ACQUIRE MENU.

H Press the main-menu button Mode; then press the side-menu button

Average 16.

H Press Measure. Now press the main-menu button High--Low Setup;

then press the side-menu button Min--Max.

Sine Wave

Generator

Output

Digitizing Oscilloscope

Figure 1- 6: Initial Test Hookup

NOTE. Refer to the Sine Wave Generator Leveling Procedure on page 1--55 if
your sine wave generator does not have automatic output amplitude leveling.

c. Hook up the test-signal source:

H Connect the sine wave output of a sine wave generator to CH 1 (see

Figure 1--6). Set the output of the generator to a reference frequency
of 10 MHz or less.

H Set the horizontal SCALE to 50 ns. (If using a reference other than

10 MHz, adjust the horizontal SCALE todisplay4to6cyclesof
the waveform.)

1- 26

2. Confirm the input channels are within limits for analog bandwidth: Do the

following substeps — test CH 1 first, skipping substeps a and b since CH 1

is already set up for testing from step 1.

a. Select an unchecked channel:

H Press WAVEFORM OFF to remove the channel just confirmed

from display.

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

to confirm.

H Move the leveled output of the sine wave generator to the channel

you select.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

b. Match the trigger source to the channel selected:

c. Set the input impedance of the channel:

d. Set the vertical scale: Set the vertical SCALE to one of the settings

Table 1- 3: Analog Bandwidth (TDS 420A)

Performance Tests

H Press TRIGGER MENU.

H Press the main-menu button Source.

H Press the side-menu button that corresponds to the channel selected.

H Press VERTICAL MENU; then press the main-menu

button Coupling.

H Press the side-menu button Ω to toggle it to the 50 Ω setting.

listed in Table 1--3 (TDS 420A) or Table 1--4 (TDS 430A and
TDS 460A) not yet checked. (Start with the 100 mV setting.)

Vertical Scale Reference Amplitude Horizontal Scale Test Frequency Limits

100 mV 600 mV (6 divisions) 5ns 200 MHz ≥424 mV

1

1V

500 mV 2 V (4 divisions) 5ns 200 MHz ≥1.414 V

200 mV 1.2 V (6 divisions) 5ns 200 MHz ≥848 mV

50 mV 300 mV (6 divisions) 5ns 200 MHz ≥212 mV

20 mV 120 mV (6 divisions) 5ns 200 MHz ≥84 mV

10 mV 60 mV (6 divisions) 5ns 200 MHz ≥42 mV

5mV 30 mV (6 divisions) 5ns 200 MHz ≥21 mV

2mV 12 mV (6 divisions) 5ns 150 MHz ≥8.4 mV

1mV 6 mV (6 divisions) 5ns 95 MHz ≥4.2 mV

1

If the oscilloscope does not trigger in step 2e, change the trigger coupling to DC for this Vertical Scale setting.

2 V (2 divisions) 5ns 200 MHz ≥1.414 V

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 27

Performance Tests

Table 1- 4: Analog Bandwidth (TDS 430A and TDS 460A)

Vertical Scale Reference Amplitude Horizontal Scale Test Frequency Limits

100 mV 600 mV (6 divisions) 2ns 400 MHz ≥424 mV

1

1V

500 mV 2 V (4 divisions) 2ns 400 MHz ≥1.414 V

200 mV 1.2 V (6 divisions) 2ns 400 MHz ≥848 mV

50 mV 300 mV (6 divisions) 2ns 400 MHz ≥212 mV

20 mV 120 mV (6 divisions) 2ns 400 MHz ≥84 mV

10 mV 60 mV (6 divisions) 2ns 400 MHz ≥42 mV

5mV 30 mV (6 divisions) 2ns 400 MHz ≥21 mV

2mV 12 mV (6 divisions) 2ns 250 MHz ≥8.4 mV

1mV 6 mV (6 divisions) 2ns 100 MHz ≥4.2 mV

1

If the oscilloscope does not trigger in step 2e, change the trigger coupling to DC for this Vertical Scale setting.

2 V (2 divisions) 2ns 400 MHz ≥1.414 V

e. Display the test signal: Do the following subparts to first display the

reference signal and then the test signal.

H Press MEASURE; then press the main-menu button Select

Measurement for CHx.

H Now press the side menu button more until the menu label Pk-Pk

appears in the side menu (its icon is shown at the left). Press the
side-menu button Pk-Pk.

H Press CLEAR MENU.

H Set the sine wave generator output (if necessary, use 10X attenua-

tors) so the CHx Pk-Pk readout equals the reference amplitude in
Table 1--3 (TDS 420A) or Table 1--4 (TDS 430A and TDS 460A)
that corresponds to the vertical scale set in substep d.

H Press the front-panel button SET LEVEL TO 50% as necessary to

trigger a stable display.

f. Measure the test signal:

H Increase the frequency of the generator output (leveled output) to the

test frequency in Table 1--3 (TDS 420A) or Table 1--4 (TDS 430A
and TDS 460A) that corresponds to the vertical scale set in
substep d.

1- 28

H Set the horizontal SCALE to 5 ns (TDS 420A) or 2 ns (TDS 430A

and TDS 460A).

H Press SET LEVEL TO 50% as necessary to trigger the display.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Read the results

from the readout of

measurement Pk-Pk.

Set the generator

frequency to the test

frequency from

tables 1-- 3 and 1--4.

Performance Tests

H Read the results at the CHx Pk-Pk readout, which automatically

measures the amplitude of the test signal. (See Figure 1--7.)

3

1

Set the horizontal

scale from the tables.

2

Figure 1- 7: Measurement of Analog Bandwidth

g. Check against limits:

H CHECK that the Pk-Pk readout on screen is within the limits listed

in Table 1--3 (TDS 420A) or Table 1--4 (TDS 430A and
TDS 460A) for the current vertical scale setting.

H When finished checking, set the horizontal SCALE back to the

50 ns setting (the setting you used in step 1b.

STOP. Checking the bandwidth of each channel at all vertical scale settings is
time consuming and unnecessary . You may skip checking the remaining vertical
scale settings in Table 1--3 (TDS 420A) or Table 1--4 (TDS 430A and TDS 460A)
(that is, skip the following substep, h) if this digitizing oscilloscope has passed

the 100 mV vertical scale setting just checked in this procedure and passed the
Verify Internal Adjustment, Self Compensation, and Diagnostics procedure found
under Self Tests, on page 1--5.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 29

Performance Tests

NOTE. Passing the signal path compensation confirms the signal path for all
vertical scale settings for all channels. Passing the internal diagnostics ensures
that the factory-set adjustment constants that control the bandwidth for each
vertical scale setting have not changed.

h. Check remaining vertical scale settings against limits (optional):

H If desired, finish checking the remaining vertical scale settings for

the channel under test by repeating substeps d through g for each of
the remaining scale settings listed in Table 1--3 (TDS 420A) or Table
1--4 (TDS 430A and TDS 460A) for the channel under test.

H When doing substep e, skip the subparts that turn on the CHx Pk-Pk

measurement until you check a new channel.

H Install/remove 10X attenuators between the generator leveled output

and the channel input as is needed to obtain the six division
reference signals listed in the tables.

Check Delay Match

Between Channels

i. Test all channels: Repeat substeps a through g for all channels.

3. Disconnect the hookup: Disconnect the test hook up from the input

connector of the channel last tested.

Equipment
Required

Prerequisites See page 1--15.

One sine wave generator (Item 11)

One precision coaxial cable (Item 5)

One 50 Ω terminator (Item 3)

One dual-input coupler (Item 9)

STOP. DO NOT use the vertical position knob to reposition any channel while
doing this check. To do so invalidates the test.

1. Install the test hookup and preset the oscilloscope controls:

a. Initialize the front panel:

H Press save/recall SETUP.

1- 30

H Press the main-menu button Recall Factory Setup.

H Press the side-menu button OK Confirm Factory Init.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

b. Modify the initialized front-panel control settings:

H Do not adjust the vertical position of any channel during

this procedure.

H Set the horizontal SCALE to1ns.

H Press SHIFT;thenpressACQUIRE MENU.

H Press the main-menu button Mode, and then press the side-menu

button Average 16.

c. Hook up the test-signal source:

H Connect the sine wave output of a sine wave generator to a 50 Ω

precision coaxial cable, a 50 Ω termination, and a dual-input
coupler. (See Figure 1--8.)

H Connect the coupler to both CH 1 and CH 2. Ensure that the

coupler cables are of equal length.

Sine Wave

Generator

Output

50 Ω Terminator

Digitizing Oscilloscope

Dual Input
Coupler

Figure 1- 8: Initial Test Hookup

2. Confirm all channels are within limits for channel delay:

a. Set up the generator: Set the generator frequency to 250 MHz and the

amplitude for about five divisions in CH 1.

Hint: as you are adjusting the generator amplitude, push SET LEVEL
TO 50% frequently to speed up the updating of the waveform amplitude
on screen.

b. Save a CH 2 waveform: Press CH 2; then press save/recall WAVE -

FORM. Now, press the main-menu button Save Waveform;thenpress

the side-menu button To Ref 2.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 31

Performance Tests

c. If you are testing a TDS 430A, skip to step h.

d. Save a CH 3 waveform: Move the coupler from CH 2 to CH 3, so that

CH 1 and CH 3 are driven. Press CH 3; then press the side-menu button
To Re f 3.

e. Display all test signals:

H Press WAVEFORM OFF twice to remove CH 2 and CH 3 from

the display.

H Move the coupler from CH 3 to CH 4,sothatCH1andCH4are

driven. Press CH 4 to display.

H Now, press the front-panel button MORE. Press the main-menu

buttons Ref 2 and Ref 3.

f. Measure the test signal:

H Locate the point on the rising edge of the left-most waveform where

it crosses the center horizontal graticule line. This is the time

reference point for this waveform. Note the corresponding time
reference point for the right-most waveform. See Figure 1--9.

H Press CURSOR; then press the side-menu button V Bars.

H Press CLEAR MENU.

H Rotate the General Purpose knob to align one cursor to the time

reference point of the left-most waveform edge and the other cursor
to the time reference point of the right-most waveform edge. (Press
SELECT to switch between the two cursors.) See Figure 1--9.

H Read the measurement results at the ∆: cursor readout, not the @:

readout on screen.

g. Check all channels against limit: CHECK that the cursor readout on

screen is ≤450 ps. If the cursor readout is ≤200 ps, skip substep h.

1- 32

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

Read the

results here.

Display the live/reference

waveforms for all four channels

Note their overlapping ground

references.

Identify the time reference

points of the waveforms.

Turn on the cursor and align
the V bar cursors to the time

reference points.

4

1

2

3

Figure 1- 9: Measurement of Channel Delay

h. Check CH 1 to CH 2 and CH 3 to CH 4 against limit:

H Press WAVEFORM OFF four times to remove all waveforms.

H Press CH 1.

H Press MORE; then press the main-menu button Ref 2.

H Measure the delay between CH 1 and Ref 2 using the method

described in substep f above.

H CHECK that the cursor readout on screen is ≤200 ps.

H If you are testing a TDS 430A, skip to step 3.

H Press WAVEFORM OFF twice to turn off CH 1 and Ref 2; then

press CH 4 to turn on CH 4.

H Press MORE; then press the main-menu button Ref 3 to display the

CH3waveformstoredinRef3.

H Measure the delay between Ref 3 and CH 4 using the method

described in substep f above.

H CHECK that the cursor readout on screen is ≤200 ps.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

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Performance Tests

3. Disconnect the hookup: Disconnect the cable from the generator output at

Time Base System Checks

These procedures check those characteristics that relate to the Main and Delayed
time base system and are listed as checked under Warranted Characteristics in
Chapter 2, Specifications.

the input connectors of the channels.

Check Accuracy for

Long-Term Sample Rate,

Delay Time, and Delta

Time Measurements

Equipment
Required

Prerequisites See page 1--15.

One time standard, eit her a frequency accurate sine wave generator or
time marker generator (Item 11)

Attenuators, 10X and 5X (Items 1 and 2)

One precision coaxial cable (Item 5).

1. Install the test hookup and preset the oscilloscope controls:

a. Hook up the test-signal source: Connect, through a 50 Ω precision

coaxial cable, the output of a time standard to CH 1 (see Figure 1--10).
Set the output of the standard to 100 MHz (or a period of 10 ns).

Time

Standard

Output

Attenuator (if necessary)

Digitizing Oscilloscope

1- 34

50 Ω Coaxial Cable

Figure 1- 10: Initial Test Hookup

b. Initialize the oscilloscope:

H Press save/recall SETUP.

H Press the main-menu button Recall Factory Setup.

H Press the side-menu button OK Confirm Factory Init.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

c. Modify the initialized front-panel control settings:

H Press VERTICAL MENU; then press the main-menu button

Coupling. Press the side-menu button Ω to change the coupling
setting to 50 Ω.

H If necessary, set the vertical SCALE to 100 mV per division.

H Set the horizontal SCALE of the Main time base to 2.0 ns.

H Using external attenuators if necessary, adjust the time standard

amplitude for a 5 to 7 division display.

H Rotate the vertical POSITION control to center the

displayed waveform.

2. Confirm Main and Delayed time bases are within limits for accuracies:

a. Check delta-time accuracy against limits:

H Press SET LEVEL TO 50%.

H Press SHIFT; then ACQUIRE MENU. Now press the main-menu

button Mode; then press the side-menu button Average.

H Use the General Purpose knob to set the number of averages to 8.

H Press MEASURE.

H Press the main-menu button High-Low Setup; then press the

side-menu button Min-Max.

H Press the main-menu button Select Measurement for Ch1.

H Press the side-menu button -- m o r e -- , until PERIOD appears in the

side menu. Press PERIOD.

H Press CLEAR MENU.

H CHECK that the readout for CH 1 Per is within 9.7 ns to 10.3 ns.

b. Check long-term sample rate and delay time accuracies against limits:

H Press SHIFT; then ACQUIRE MENU. Now press the main-menu

button Mode; then press the side-menu button Sample.

H Press MEASURE.

H Press the main-menu button Remove Measurement; then press the

side-menu button Measurement 1.

H Set the horizontal SCALE of the Main time base to 100 ns.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

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Performance Tests

H Set the frequency of the time standard to 1.0 MHz (or a period of

1.00 s).

H Adjust the amplitude of the time standard for a 5 to 7

division display.

H Press CLEAR MENU.

H Press SET LEVEL TO 50%.

H Rotate the horizontal and vertical POSITION controls to move the

rising edge of the waveform so that it crosses the center of both the
horizontal and vertical graticule lines.

H Press HORIZONTAL MENU; then press the main-menu button

Time Base. Press the side-menu button Delayed Only

H Use the horizontal SCALE knob to set the D (delayed) time base

to 100 ns.

H Press the side-menu button Delayed Runs After Main; then use the

General Purpose knob to set Delayed Runs After Main to 10.0 s.

H CHECK that the rising edge of the waveform crosses the center

horizontal graticule line at a point within ±0.5 divisions of the center
graticule (see Figure 1--11).

H Use the horizontal SCALE knob to set the D (delayed) time base

to 50 s. (The scale of the Main time base will also change.)

H Use the General Purpose knob to set Delayed Runs After Main

to 100 s.

H Use the horizontal SCALE knob to set the D (delayed) time base

to 100 ns.

H CHECK that the rising edge of the waveform crosses the center

horizontal graticule line at a point within ±0.5 divisions of the
center graticule.

1- 36

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Check that the waveform rising

edge is within ±0.5 horizontal

divisions on the center

horizontal graticule line.

Performance Tests

3

Set the
delayed

1

horizontal
modes.

Enter a 10.0 s delay and set the horizontal

scale for the D time base to 100 ns.

Figure 1- 11: Measurement of Accuracy — Long-Term and Delay-Time

H Set the horizontal SCALE of the D (delayed) time base to 500 s.

(The scale of the Main time base will also change.)

H Use the General Purpose knob to set Delayed Runs After Main

to 1.00 ms.

H Use the horizontal SCALE knob to set the D (delayed) time base

to 100 ns.

H CHECK that the rising edge of the waveform crosses the center

horizontal graticule line at a point within ±1.5 divisions of the
center graticule.

3. Disconnect the hookup: Disconnect the cable from the time standard at the
input connector of CH 1.

2

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 37

Performance Tests

Trigger System Checks

These procedures check those characteristics that relate to the Main and Delayed
trigger systems and are listed as checked under Warranted Characteristics in
Chapter 2, Specifications.

Check Accuracy, Trigger

Level or Threshold, DC

Coupled

Equipment
Required

Prerequisites See page 1--15.

One DC calibrat ion generator (Item 10)

One BNC T connector (Item 8)

Two precision coaxial cables (Item 5)

1. Install the test hookup and preset the instrument controls:

a. Hook up the test-signal source:

H Set the output of a DC calibration generator to 0 volts.

H Connect the output of a DC calibration generator through a

dual-banana connector followed by a 50 Ω precision coaxial cable to
one side of a BNC T connector.

H Connect the Sense output of the generator, through a second

dual-banana connector followed by a 50 Ω precision coaxial cable,
to the other side of the BNC T connector. Now connect the BNC T
connector to CH 1 (see Figure 1--12).

Output Sense

Digitizing Oscilloscope

1- 38

DC Calibrator

Dual Banana to

BNC Adapters

BNC T

50 Ω Coaxial Cables

Connector

Figure 1- 12: Initial Test Hookup

b. Initialize the oscilloscope:

H Press save/recall Setup.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

H Press the main-menu button Recall Factory Setup.

H Press the side-menu button OK Confirm Factory Init.

2. Confirm Main trigger system is within limits for Trigger-level/Threshold
accuracy:

a. Display the test signal:

H Set the vertical SCALE to 50 mV.

H Set the standard output of a DC calibration generator to +0.3 V.

b. Measure the test signal:

H Press SET LEVEL TO 50%.

H Press TRIGGER MENU.

H Read the measurement results from the readout below the label

Level in the menu rather than from the trigger readout in the
graticule area.

c. Check against limits:

H Subtract the trigger level readout from the DC calibration generator

setting. The result is the trigger level accuracy.

H CHECK that the trigger level is accurate to within ᐔ18 mV.

H Press TRIGGER MENU. Press the main-menu button Slope; then

press the side-menu button for negative slope. (See icon at left.)
Repeat substep b.

H Subtract the trigger level readout from the DC calibration generator

setting. The result is the trigger level accuracy.

H CHECK that the trigger level is accurate to within ᐔ18 mV.

3. Confirm Delayed trigger system is within limits for Trigger-level/Threshold
accuracy:

a. Select the Delayed time base:

H Press HORIZONTAL MENU.

H Press the main-menu button Time Base.

H Press the side-menu buttons Delayed Only and

Delayed Triggerable.

H Set D (delayed) horizontal SCALE to 500 s.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

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Performance Tests

b. Select the Delayed trigger system:

H Press SHIFT; then press the front-panel button DELAYED TRIG.

H Press the main-menu button Level.

c. Measure the test signal: Press the side-menu

button SET TO 50%.

Read the measurement results in the side menu below the label Level.

d. Check against limits: Do the following subparts in the order listed.

H Subtract the trigger level readout from the DC calibration generator

setting. The result is the trigger level accuracy.

H CHECK that the trigger level is accurate to within ᐔ18 mV.

H Press TRIGGER MENU. Press the main-menu button Slope; then

press the side-menu button for negative slope. (See icon at left.)

H Subtract the trigger level readout from the DC calibration generator

setting. The result is the trigger level accuracy.

H CHECK that the trigger level is accurate to within ᐔ18 mV.

4. Disconnect the hookup:

a. First set the output of the DC calibration generator to 0 volts.

b. Then disconnect the cable from the generator output at the input

connector of CH 1.

Sensitivity, Edge Trigger,

DC Coupled

1- 40

Equipment
Required

Prerequisites See page 1--15.

One sine wave generator (Item 11)

One precision 50 Ω coaxial cable (Item 5)

One 10X attenuator (Item 1)

One 5X attenuator (Item 2)

1. Install the test hookup and preset the oscilloscope controls:

a. Initialize the oscilloscope:

H Press save/recall SETUP.

H Press the main-menu button Recall Factory Setup.

H Press the side-menu button OK Confirm Factory Init.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

b. Modify the initialized front-panel control settings:

H Set the horizontal SCALE for the M (main) time base to 20 ns.

H Press HORIZONTAL MENU; then press the main-menu button

Time Base.

H Press the side-menu button Delayed Only; then press the side-menu

button Delayed Triggerable.

H Set the horizontal SCALE for the D (delayed) time base to 20 ns;

then press the side-menu button Main Only.

H Press TRIGGER MENU; then press the main-menu button Mode

&Holdoff. Now press the side-menu button Normal.

H Press VERTICAL MENU; then press the main-menu button

Coupling. Now press the side-menu button Ω to select the

50 Ω setting.

H Press SHIFT;thenpressACQUIRE MENU. Now press the

main-menu button Mode; then press the side-menu button

Average 16.

c. Hook up the test-signal source: Connect, through a 50 Ω precision

coaxial cable, the signal output of a sine wave generator to CH 1 (see
Figure 1--13).

Sine Wave

Generator

Output

Digitizing Oscilloscope

Figure 1- 13: Initial Test Hookup

2. Confirm Main and Delayed trigger systems are within sensitivity limits
(50 MHz):

a. Display the test signal:

H Set the generator frequency to 50 MHz.

H Press MEASURE.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 41

Performance Tests

H Press the main-menu button High-Low Setup; then press the

side-menu button Min-Max.

H Press the main-menu button Select Measurement for Ch1.

H Press the side-menu button -- m o r e -- until Amplitude appears in the

side menu (its icon is shown at the left). Press the side-menu
button Amplitude.

H Adjust the trigger MAIN LEVEL knob to obtain stable

triggered waveform.

H Press CLEAR MENU.

H Set the test signal amplitude for about three and a half divisions on

screen. Now fine adjust the generator output until the CH 1
Amplitude readout indicates the amplitude is 350 mV. (Readout

may fluctuate around 350 mV.)

H Disconnect the 50 Ω precision coaxial cable at CH 1 and reconnect

it to CH 1 through a 10X attenuator.

b. Check for Main trigger system for stable triggering at limits:

H Read the following definition: A stable trigger is one that is

consistent; that is, one that results in a uniform, regular display
triggered on the selected slope (positive or negative). This display
should not have its trigger point switching between opposite slopes,
nor should it “roll” across the screen. At horizontal scale settings of
2 ms/division and faster, TRIG’D remains constantly lit. It flashes
for slower settings.

H Press TRIGGER MENU; then press the main-menu button Slope.

H Press SET LEVEL TO 50%. CHECK that a stable trigger is

obtained for the test waveform on both the positive and negative
slopes. (Use the side menu to switch between trigger slopes; use the
trigger MAIN LEVEL knob to stabilize the trigger if required.)

H Leave the Main trigger system triggered on the positive slope of the

waveform before continuing to the next step.

1- 42

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Set a signal with

an amplitude

at the minimum

trigger sensitivity.

Check for a stable

trigger at both the

positive and negative

slope settings.

Performance Tests

1

2

Figure 1- 14: Measurement of Trigger Sensitivity

c. Check delayed trigger system for stable triggering at limits: Do the

following subparts in the order listed.

H Press HORIZONTAL MENU; then press the main-menu button

Time Base. Now press the side-menu button Delayed Only.

H Press SHIFT;thenpressDELAYED TRIG. Press the main-menu

button Level.

H Press the side

-menu button SE T TO 50%. CHECK that a stable

trigger is obtained for the test waveform for both the positive and
negative slopes of the waveform. (Use the General Purpose knob to
stabilize the trigger if required.) Press the main-menu button Slope;
then use the side menu to switch between trigger slopes.

H Leave the delayed trigger system triggered on the positive slope of

the waveform before continuing to the next step. Also, return to the
main time base: Press HORIZONTAL MENU; then press the
main-menu button Time Base. Now press the side-menu button

Main Only.

3. Confirm that the Main and Delayed trigger systems are within sensitivity

limits (at upper frequency limits):

a. Hook up the test-signal source: Disconnect the hookup installed in

step 1. Connect the signal output of a sine wave generator to CH 1.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 43

Performance Tests

b. Set the Main and Delayed Horizontal Scales:

H Set the horizontal SCALE to5nsfortheM (Main) time base.

H Press the side-menu button Delayed Only.

H Set the horizontal SCALE to2nsfortheD (Delayed) time base.

Press the side-menu button Main Only.

c. Display the test signal:

H Set the generator frequency to 350 MHz (TDS 420A) or 500 MHz

(TDS 430A and TDS 460A).

H Set the test signal amplitude for about five divisions on screen. Now

fine adjust the generator output until the CH 1 Amplitude readout
indicates the amplitude is 500 mV. (Readout may fluctuate around
500 mV.)

H Disconnect the sine wave at CH 1 and reconnect it to CH 1 through

a 5X attenuator.

Maximum Input

Frequency , Auxiliary

Trigger

d. Repeat step 2, substeps b and c only.

4. Confirm that the Main and Delayed trigger systems couple trigger signals

from all channels: Doing the procedure Check Analog Bandwidth, which
begins on page 1--25, checks coupling. If you have not done that procedure,
do so after finishing this procedure. See the following note.

NOTE. Steps 1 through 3 confirmed trigger sensitivity for the Main and Delayed
triggering systems using the CH 1 input. Doing the procedure Check Analog
Bandwidth ensures that trigger signals are coupled from all channels.

5. Disconnect the hookup: Disconnect the cable from the generator output at

the input connector of the channel last tested.

Equipment
Required

Prerequisites See page 1--15.

One sine wave generator (Item 11)

Two precision 50 Ω coaxial cables (Item 5)

One BNC T connector (Item 8)

1- 44

1. Install the test hookup and preset the oscilloscope controls:

a. Initialize the oscilloscope:

H Press save/recall SETUP.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

H Press the main-menu button Recall Factory Setup.

H Press the side-menu button OK Confirm Factory Init.

b. Modify the initialized front-panel control settings:

H Set the vertical SCALE to 1 volt; set the horizontal SCALE

to 20 ns.

H Press VERTICAL MENU.

H Press the main-menu button Coupling. Press the side-menu button

Ω to toggle it to the 50 Ω setting.

H Press TRIGGER MENU. Press the main-button SOURCE; then

press the side-menu button -- m o r e -- until Auxiliary appears in the
side menu. Press the side-menu button Auxiliary.

H Press the Coupling main-menu button; then press the AC side-

menu button.

c. Hook up the test-signal source:

H Connect a BNC T connector to the output of the sine wave generator

(see Figure 1--15).

H Connect one 50 Ω cable to one side of the BNC T connector;

connect a second 50 Ω cable to the other side of the
BNC T connector.

H Connect one of the cables just installed to CH 1; connect the other

cable just installed to the AUX TRIGGER input at the rear panel.

Sine Wave

Generator

To Rear Panel

Output

Digitizing Oscilloscope

Figure 1- 15: Initial Test Hookup

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 45

Performance Tests

NOTE. Refer to the Sine Wave Generator Leveling Procedure on page 1--55 if
your sine wave generator does not have automatic output amplitude leveling.

2. Confirm the Trigger input:

a. Display the test signal:

H Set the generator for a 10 MHz, four division signal.

b. Check the Main trigger system for stable triggering at limits:

H Read the following definition: A stable trigger is one that is

consistent; that is, one that results in a uniform, regular display
triggered on the selected slope (positive or negative). This display
should not have its trigger point switching between opposite slopes,
nor should it “roll” across the screen (see Figure 1--16).

Set a signal with a four

division amplitude and a

10 MHz frequency.

Check for a stable trigger

at both the positive and

negative slope settings.

1

2

Figure 1- 16: Confirming Auxiliary Triggering at Maximum Triggering Frequency

3. Disconnect the hookup: Disconnect the cable from the generator output at

the input connector of the channel last tested.

1- 46

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

Check External Clock

Equipment
Required

Prerequisites See page 1--15.

One Function generator (Item 14)

One Sine Wave generator (Item 11)

One 50Ω terminator (Item 3)

One N to BNC adapter (Item 15

One BNC T connector (Item 8)

Two precision coaxial cables (Item 5)

1. Install the test hookup and preset the instrument controls:

a. Initialize the oscilloscope:

H Press save/recall SETUP.

H Press the main-menu button Recall Factory Setup.

H Press the side-menu button OK Confirm Factory Init.

b. Hook up the test-signal source:

H Set the Vertical SCALE to 1 Volt per division.

H Connect the output of a function generator through a 50 Ω precision

coaxial cable and a 50 Ω terminator to the CH 1 input.

H Set the output of the function generator for a 5 MHz, 0 to 4 Volt

(4 division) square wave at the oscilloscope input.

H Move the setup from the CH 1 input to the AUX TRIGGER/EXT

CLOCK input on the rear panel of the oscilloscope (see

Figure 1--17).

Sine Wave

Generator

Output

Digitizing Oscilloscope

Figure 1- 17: Initial Test Hookup

To Rear Panel

Function

Generator

Output

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 47

Performance Tests

H Connect the output of the sine wave generator through an N-to-BNC

adaptor, and a 50 Ω precision coaxial cable to the CH 1 input of
the oscilloscope.

H Set the Vertical SCALE to 100 mV.

H Press VERTICAL MENU, then press the Coupling main-

menu button.

H Set the coupling to 50 Ω.

H Set the output of the sine wave generator for a 100 KHz 4 division

sine wave.

c. Modify the default settings:

H Press HORIZONTAL MENU, then press the Clock main-

menu button.

H Press the side-menu button External.

H Set the Max Ext Clock Rate to 10.0 MHz.

H Press CLEAR MENU.

d. Check external clock:

H CHECK that the displayed sine wave has a one division period.

H Slowly adjust the frequency of the function generator to 10 MHz

while watching the display.

H CHECK that the period of the displayed sine wave changes to

two divisions.

H Press CLEAR MENU.

2. Disconnect the hookup: Disconnect the cables from the generators at the
CH 1 and AUX TRIGGER/EXT CLOCK input connectors.

1- 48

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

Check Video Trigger

Sensitivity

(Option 05 Equipped

Models Only)

Equipment
Required

Prerequisites See page 1--15.

One NTSC format video generator (Item 18)

One 75 Ω coaxial cable (Item 6)

One 75 Ω terminator (Item 4)

1. Install the test hookup and preset the oscilloscope controls:

a. Initialize the oscilloscope:

H Press save/recall SETUP.

H Press the main menu button Recall Factory Setup.

H Press the side menu button OK Confirm Factory Init.

b. Modify the default setup:

H Set the vertical SCALE to 500 mV.

H Set the horizontal SCALE to 20 s.

H Press HORIZONTAL MENU.

H Press the main menu button Record Length.

H Press the side menu button 5000 points in 100 divs.

c. Hook up the test-signal source: Connect, through a 75 Ω precision

coaxial cable, followed by a 75 Ω terminator, the output of a NTSC
format video generator to CH 1 (see Figure 1--18).

Video

Generator

Output

Digitizing Oscilloscope

75 Ω
Terminators

Figure 1- 18: Initial Test Hookup

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 49

Performance Tests

2. Confirm the video trigger system is within limits:

a. Display the test signal:

H Set video generator to N TSC format.

H Set the output of the generator for a five step ramp with color burst.

H Press SET TO 50%. Use the trigger MAIN LEVEL knob to

stabilize the display as required.

H Press TRIGGER MENU.

H Press the main menu button Mode & Holdoff. Then press the side

menu button Normal.

b. Fine adjust the sync pulse amplitude: The amplitude of the TV

waveform should now be about 2 divisions pk-pk. Do the following
subparts to fine adjust the vertical gain until the sync pulses measure
exactly 0.6 divisions peak-to-peak using the graticule:

H Press VERTICAL MENU.

H Press the main menu button Fine Scale.

H Use the General Purpose knob, adjust the fine gain until the sync

pulse amplitude is 0.6 divisions measured using the graticule (see
Figure 1--19).

1- 50

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Adjust the sync pulse

amplitude for 0.6 divisions.

Performance Tests

Figure 1- 19: Adjusting Sync Pulse Amplitude

c. Check for stable triggering against limits:

H Read the following definition: A stable trigger is one that is

consistent; that is, one that results in a uniform, regular display
triggered on the selected slope (positive or negative). This display
should not have its trigger point switching between opposite slopes,
nor should it “roll” across the screen. At horizontal scale settings
appropriate for viewing video waveforms, the TRIG’D light remains
constantly lit.

H Press TRIGGER MENU. Press the main menu button Type

twice — first to pop up its menu and then to toggle it to Video.

H Press the main menu button Class to pop up its menu. Press it again

as needed to toggle it to NTSC.

H Press the main menu button Scan to pop up its menu.

H Press the side menu button Odd. Center the display at mid screen.

H CHECK that a stable trigger is obtained with the last two lines of

TV field 2 and the beginning of TV field 1 displayed. (If the last line
is a full TV line duration (63.5 s), then it is the end of field 2 — see
waveform R1 in Figure 1--20.)

H Press the side menu button Even. Center the display at mid screen.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

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Performance Tests

R1 waveform: Note that two

full lines start the display

H CHECK that a stable trigger is obtained with the last of TV field 1

and the beginning of TV field 2 displayed. (If the last line is ½ of a
TV line duration (31.75 s), then it is the end of field 1 — see
waveform R2 in Figure 1--20.)

H Press the side menu button All.

H Press the main menu button Mode and Holdoff. Then press the side

menu button Hold off.

H Use the General Purpose knob to set the holdoff to 1.

R2 waveform: Note that 1½

lines start the display

R3 and R4 waveforms: Note

that with non-interlaced,

both fields, scan mode,

CH 1 switches between the

R3 and R4 displays

Figure 1- 20: Measurement of Video Sensitivity

H Rotate the horizontal POSITION control clockwise to move the

ends of both fields to the center of the display.

H CHECK that a stable trigger is obtained while alternating between

field 1 and field 2. (If the last line is alternating between a full TV
line and ½ a line in duration (63.5 s and 31.75 s respectively),
then triggering is occurring on both fields — see waveforms R3 and
R4 in Figure 1--20.)

1- 52

d. Check delay by lines:

H Press the main-menu button Scan.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

H Press the side-menu button Odd.

H Rotate the horizontal POSITION control counter clockwise and

align the trigger “T” to center screen

H Press the main-menu button TV Delay Mode.

H Press the side-menu button Line.

H Use the General Purpose knob to set the line count to 10.

H CHECK that the selected line is the first line that has the color

burst signal.

e. Check sync trigger:

H Using the Vertical POSITION knob, move the video waveform

from the top to the bottom of the display.

H CHECK that the TRIG’D LED stays on and the waveform is stable.

Output Signal Check

Check Probe Adjust

Output

H Using the Vertical POSITION knob return the waveform to the

centerofthedisplay.

3. Disconnect the hookup: Disconnect the cable from the generator output at
the input connector of CH 1.

The procedure that follows checks the characteristics of the probe compensation
signal that are listed as checked under Warranted Characteristics in
Chapter 2, Specifications.

Equipment
Required

Prerequisites See page 1--15. Also, this digitizing oscilloscope must have passed

One standard-accessory 10X probe (Item 17)

Check Accuracy — Long-Term Sample Rate, Delay time, and Delta
Time Measurements on page 1--34, and Check DC Voltage
Measurement Accuracy (Averaged) on page 1--22.

1. Install the test hookup and preset the oscilloscope controls:

a. Hook up test signal: Install the standard-accessory probe on CH 1.

Connect the probe tip to PROBE ADJ on the front panel; leave the
probe ground unconnected (see Figure 1--21).

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 53

Performance Tests

Digitizing Oscilloscope

Figure 1- 21: Initial Test Hookup

b. Initialize the oscilloscope:

H Press save/recall SETUP.

H Press the main-menu button Recall Factory Setup.

H Press the side-menu button OK Confirm Factory Init.

c. Modify the initialized front-panel control settings:

H Press AUTOSET. Set the horizontal SCALE to 200 s.

H Press SHIFT;thenpressACQUIRE MENU.

H Press the main-menu button Mode; then press the side-menu button

Hi Res.

2. Confirm that the Probe Compensator signal is within limits for amplitude

and frequency:

a. Measure the amplitude and frequency of the probe compensation signal:

H Press MEASURE; then press the main-menu button Select

Measurement for Ch1.

H Now repeatedly press the side-menu button -- m o r e -- until Amplitude

appears in the side menu (its icon is shown at the left). Press the
side-menu button Amplitude.

H Repeatedly press the side-menu button -- m o r e -- until Frequency

appears in the side menu (its icon is shown at the left). Press the
side-menu button Frequency.

1- 54

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

H Press CLEAR MENU to remove the menus from the display. See

Figure 1--22.

Figure 1- 22: Measurement of Probe Compensator Limits

b. Check against limits: CHECK that the CH 1 Freq readout is within

950 Hz to 1.050 kHz, inclusive, and that the readout for Ch1 Ampl is
within 475 mV to 525 mV, inclusive.

c. Disconnect the test hookup: Remove the test probe as desired.

Sine Wave Generator Leveling Procedure

Some procedures in this manual require a sine wave generator to produce the
necessary test signals. If you do not have a leveled sine wave generator, use one
of the following procedures to level the output amplitude of your sine
wave generator.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 55

Performance Tests

Procedure for Best

Accuracy

Equipment
Required

Sine Wave Generator (Item 11)

Level Meter and Power Sensor (Item 12)

Power Splitter (Item 13)

Two Male N to Female BNC Adapters (Item 15)

One precision coaxial cable (Item 5)

Prerequisites See page 1--15.

Sine Wave

Generator

Output

Digitizing Oscilloscope

Power

Splitter

Level
Meter

Input

Attenuators
(if necessary)

Power

Sensor

Figure 1- 23: Sine Wave Generator Leveling Equipment Setup

1. Install the test hookup: Connect the equipment as shown in Figure 1--23.

2. Set the Generator:

H Set the sine wave generator to a reference frequency of 10 MHz.

H Adjust the sine wave generator amplitude to the required number of

divisions as measured by the digitizing oscilloscope.

3. Record the reference level: Note the reading on the level meter.

4. Set the generator to the new frequency and reference level:

H Change the sine wave generator to the desired new frequency.

1- 56

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Performance Tests

H Input the correction factor for the new frequency into the level meter.

H Adjust the sine wave generator amplitude until the level meter again

reads the value noted in step 3. The signal amplitude is now
correctly set for the new frequency.

Alternate Procedure for

Maximum Amplitude

Equipment
Required

Prerequisites See page 1--15.

Sine Wave Generator (Item 11)

Level Meter and Power Sensor (Item 12)

Two Male N to Female BNC Adapters (Item 15)

Two precision coaxial cables (Item 5)

1. Install the test hookup: Connect the equipment as shown in Figure 1--24
(start with the sine wave generator connected to the digitizing oscilloscope).

Digitizing Oscilloscope

Sine Wave

Generator

Output

Level
Meter

Power

Sensor

Connect the sine wave

generator to the

oscilloscope and the

power sensor as

directed in the text.

Input

Figure 1- 24: Equipment Setup for m aximum Amplitude

2. Set the Generator:

H Set the sine wave generator to a reference frequency of 10 MHz.

H Adjust the sine wave generator amplitude to the required number of

divisions as measured by the digitizing oscilloscope.

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

1- 57

Performance Tests

3. Record the reference level:

H Disconnect the sine wave generator from the digitizing oscilloscope.

H Connect the sinewave generator to the power sensor.

H Note the level meter reading.

4. Set the generator to the new frequency and reference level:

H Change the sine wave generator to the desired new frequency.

H Input the correction factor for the new frequency into the level meter.

H Adjust the sine wave generator amplitude until the level meter again

reads the value noted in step 3. The signal amplitude is now correctly set
for the new frequency.

H Disconnect the sine wave generator from the power sensor.

H Connect the sinewave generator to the digitizing oscilloscope.

1- 58

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Specifications

Specification

This Chapter begins with a general description of the traits of the TDS 400A Digi-

tizing Oscilloscopes

. Three sections follow, one for each of three classes of traits:

nominal traits, warranted characteristics, and typical characteristics.

The TDS 400A Digitizing Oscilloscopes are portable, four-channel instruments
suitable for use in a variety of test and measurement applications and systems.
Table 2--1 lists key features.

Table 2- 1: Key Features of the TDS 400A Oscilloscopes

Feature Description

Digitizing rate, maximum 100 MS/s on each channel simultaneously

Analog bandwidth TDS 460A: 400 MHz

TDS 420A: 200 MHz

TDS 430A: 400 MHz

Channels TDS 460A: Four, each with 8-bit resolution

TDS 420A: Four, each with 8-bit resolution

TDS 430A: Two, each with 8-bit resolution

Record lengths, maximum 30,000 samples (120,000 with option 1M)

Acquisition modes Sample, envelope, average, high-resolution, and peak-detect

Trigger modes Edge

With Option 05, video trigger modes include:
NTSC, SECAM, PAL, and Custom

Display Modes Infinite and variable persistence, roll, fit to screen, and dual

waveform zoom

Storage A 1.44 Mbyte, 3.5 inch, DOS 3.3-or-later floppy disk and

NVRAM storage for saving waveforms, hardcopies, and setups

I/O Full GPIB programmability

Hardcopy output using GPIB and, with Option 13, RS-232 or
Centronics ports

Math Including: invert, add, subtract, multiply, and with Option 2F,

integral, differential, and FFT

User interface A graphical user interface, on-line help. and a logical

front-panel layout

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

2- 1

Specification

2- 2

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Nominal Traits

g,,

Nominal traits are described using simple statements of fact such as “Four, all
identical” for the trait “Input Channels, Number of,” rather than in terms of
limits that are performance requirements.

Table 2- 2: Nominal Traits — Signal Acquisition System

Name Description

Bandwidth Selections 20 MHz, 100 MHz, and FULL (TDS 420A: 200 MHz, TDS 430A and

TDS 460A: 400 MHz)

Digitizers, Number of TDS 430A: Two, both identical

TDS 420A and TDS 460A: Four, all identical

Digitized Bits, Number of 8bits

Digitized Resolution, Hi Res Mode Clock, Internal:

1

Resolution

Clock, External:

Resolution

≅ 8 ≤ Ꮑ8 + 0.5 Log

HiRes

≅ 8 ≤Ꮑ8 + 0.5 Log

HiRes

timediv

Ꮛ

2

500 ⋅ 10

Ꮛ

2

ClockExternalMenu

Ꮠ

–9

100, 000, 000

Ꮖ≤ 15 bits

Ꮠ

Ꮖ

≤ 11.8 bits

Bandwidth, Hi Res Mode Clock, Internal:

50

For 1sdiv and slower, BW

Clock, External:

ClockExternalMenu

BW

≅ 44 ⋅

HiRes

Input Channel s, Number of TDS 430A: Two, both identical, called CH 1 and CH 2

TDS 420A and TDS 460A: Four, all identical, called CH 1 through CH 4

Input Coupl ing DC, AC, or GND

Input Resi stance Selections

Ranges, Offset, All Channel s Volts/Div Setting Offset Range

Range, Position ±5 divisions

Range, Sensitivity

3

1MΩ or 50 Ω

1 mV/div to 99.5 mV/div ±1V

100 mV/div to 995 mV/div ±10 V

1 V/div to 10 V/div ±100 V

1mV/divto10V/div

Ꮛ

2

100

HiRes

≅ 0.44 ⋅

Ꮛ

timediv

Ꮠ

Hz

Ꮠ

Hz

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

2- 3

Nominal Traits

Table 2- 2: Nominal Traits — Signal Acquisition System (Cont.)

Name Description

Rise Time
(TDS420A)

Rise Time
(TDS 430A and TDS 460A)

1

2

3

4

4

Volts/Div Setting Rise Time

5mV/div--10V/div 1.75 ns

2mV/div--4.98mV/div 2.33 ns

1mV/div--1.99mV/div 3.68 ns

4

Volts/Div Setting Rise Time

5mV/div--10V/div 875 ps

2mV/div--4.98mV/div 1.4 ns

1mV/div--1.99mV/div 3.5 ns

Displayed vertically with 25 digitization levels (DLs) per division and 10.24 divisions dynamic range with zoom off. A DL
is the smallest voltage level change resolved by the 8-bit A-D Converter with the input scal ed to the volts/division setting
of the channel used. Expressed as a voltage, a DL is equal to 1/25 of a division times the volts/division setting.

GND input coupling disconnects the input connector from the attenuator and connects a ground reference to the input of
the attenuator.

The sensitivity ranges from 1 mV/div to 10 V/div in a 1 - 2 - 5 sequence of coarse settings. Between consecutive
coarse settings, the sensitivity can be finely adjusted with a resolution of 1% of the more sensitive setting. For
example, between 50 mV/di v and 100 mV/di v, the volts/divi sion can be set with 0.5 mV resolution.

Rise time is defined by the following formula:

Rise Time (ns) =

420

BW (MHz)

2- 4

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Nominal Traits

g,g

g

Table 2- 3: Nominal Traits — Time Base System

Name Description

2,3

1,3

2.5 Samples/s to 100 MSamples/s

200 MSampl es/s to 50 GSamples/ s

120,000 point s are available with Option 1M

4

to 2 s. An external clock edge before this period ends produces an invalid sample.

Range, Sampl e-Rate

Range, Equival ent Time or Interpolated
Wavefo rm Rat e

Range, Seconds/Di vision 1ns/divto20s/div

Range, Time Base Delay Time 0 to 20 seconds

Reference Frequency, Time Base 100 MHz

Record Length Selection 500, 1,000, 2,500, 5, 000, 15, 000, and 30, 000 points. Record lengt hs of 60,000 and

Sampling Edge, Ext ernal Cl ock Negative edge, with TTL threshold and tolerances

Hi Res Averaging Period, Ext ernal Clock Hi Res averagi ng done over period 1/(maximum external clock rate5), but within <100 ns

1

The range of real-time rates, expressed i n sam ples/second, at whi ch a digitizer samples signals at its inputs and
stores the sampl es i n m emory to produce a record of time-sequential sampl es.

2

The range of waveform rates for equivalent time or interpolated waveform records.

3

The Waveform Rate (WR) is the equi valent sam ple rate of a waveform record. For a waveform record acquired by
real-time sampli ng of a single acqui sition, the waveform rate is the same as the real-time sam ple rate; for a
waveform created by interpolation of real-time samples from a si ngle acquisition or by equivalent-timesampling of
multiple acquisi tions, the waveform rate is faster than the real time sampl e rate. For al l three cases, the waveform
rate is 1/(Waveform Interval) for the waveform record, where the waveform interval (WI ) i s the time between the
samples i n the waveform record.

4

In Hi Res, the maximum Option 1M record length is 60,000 points.

5

You set the maximum external clock rate using the Horizontal Clock menu. The Hi Res samples are averaged over a
10 to 40 ns shorter period than shown by the readout.

Table 2- 4: Nominal Traits — Triggering System

Name Description

Range, Events Delay 1 to 9,999,999

Ranges, Trigger Level or Threshold Source Range

Any Channel ±12 divisions from center of screen

Line ±400 Volts

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

2- 5

Nominal Traits

Table 2- 5: Nominal Traits — Display System

Name Description

Video Display Resolution 640 pixels horizontally by 480 pixels vertically in a display area of 5.04 inches horizontally

by 3.78 inches vertically

Waveform Display Graticule A single graticule 401 × 501 pixels (8 × 10 divisions, with divisions that are 1 cm by

1cm)

Waveform Display Grey Scale 16 levels in variable-persistence display style

Table 2- 6: Nominal Traits — Data Storage

Name Description

Capacity, Nonvolatile Waveform Memory Total capacity is 120,000 points (one to four waveforms acquired with any combination of

record lengths that add up to 120,000 points). For available record lengths, see Record
Length Selection on page 2--5 of this chapter.

Capacity, Nonvolatile Setup Memory Ten setups

Batteries1Required Two lithium poly-carbon monofluoride. Both are type BR2/3A, UL list ed. Both are rated at

3.0 volt, 1.2 amp-hour.

1

Batteries are not accessible from the outside of the instrument; therefore, a service technician must replace them.

Table 2- 7: Nominal Traits — GPIB Interface, Video Output, and Power Fuse

Name Description

Interface, GPIB GPIB interface complies with IEEE Std 488.1-1987 and IEEE Std 488.2-1987.

Interface, RS-232 (Option 13 only) RS-232 interface complies with EIA/TIA 574.

Interface, Centronics (Option 13 only) Centronics interface complies with Centronics interface standard C332-44 Feb 1977,

REV A.

Power Supply, Printer (Option 13 only) Supply Voltage: +6.5 VDC

Maximum Current: 2 Amps, DC continuous

4 Amps DC maximum for durations < 10 msec

Output, Video Provides a video signal1, non-interlaced, with l evels that comply with ANSI RS343A.

Output is through a rear-panel DB-15 connector.

Fuse Rating Either of two fuses2maybeused:a0.25I × 1.25I (UL 198.6, 3AG): 8A FAST, 250 V, or

a5mm× 20 mm, (IEC 127): 6.3 A FAST, 250 V.

1

VGA compatible at 30.6 kHz sync rate.

2

Each fuse type requires its own fuse cap.

2- 6

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Nominal Traits

Table 2- 8: Nominal Traits — Mechanical

Name Description

Cooling Method Forced-air circulation with no air filter

Construction Material Chassis parts constructed of aluminum alloy; front panel constructed of plastic laminate;

circuit boards construct ed of glass-laminate. Plastic parts are polycarbonate.

Finish Type Tektronix Blue textured vinyl finish on aluminum cabinet

Weight Standard digitizing oscilloscope

9.8 kg (21.6 lbs), oscilloscope only

11.4 kg (25.1 lbs), with front cover, accessories, and accessories pouch installed

15.7 kg (34.6 lbs), when packaged for domestic shipment
225 grams (0.5 lbs) Floppy Disk Drive only

Rackmount digitizing oscilloscope

9.4 kg (20.6 lbs) plus the weight of rackmount parts, for the rackmounted digitizing
oscilloscope (Option 1R)

17.5 kg (38.6 lbs), when the rackmounted digitizing oscilloscope is packaged for
domestic shipment

Rackmount conversion kit

4.5 kg (10.0 lbs), parts only; 7.9 kg (17.5 lbs), parts plus package for
domestic shipping

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

2- 7

Nominal Traits

Table 2- 8: Nominal Traits — Mechanical (Cont.)

Name Description

Overall Dimensions Standard digitizing oscilloscope

Height 191 mm (7.5 in), when feet and accessories pouch are installed. 165 mm

(6.5 in), without the accessories pouch instal led
Width 381 mm (15 in), with handle
Depth 471 mm (18.55 in), oscilloscope only; 490 mm (19.28 in), with optional

front cover inst alled; 569 mm (22.4 in), with handle fully extended

Rackmount digitizing oscilloscope

Height 178 mm (7.0 in)
Width 483 mm (19.0 in)
Depth 472 mm (18. 6 in), without front-panel handles; 517 mm (20.35 in), with

front-panel handles installed

2- 8

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Nominal Traits

308.1 mm

(12.13 in.)

471 mm

(18.55 in.)

327.2 mm
(12.88 in.)

165 mm

(6.5 in.)

569 mm

(22.4 in.)

Figure 2- 1: TDS 400A Dimensional Drawing

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

381 mm

(15 in.)

2- 9

Nominal Traits

2- 10

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Warranted Characteristics

y,g

y

,

p

This section lists the various warranted characteristics that describe the

TDS 400A Digitizing Oscilloscopes. Included are electrical and

environmental characteristics.

Warranted characteristics are described in terms of quantifiable performance
limits which are warranted. This section lists only warranted characteristics. A
list of typical characteristics starts on page 2--19.

NOTE. In these tables, those warranted characteristics that are checked in the
procedure Performance Tests, found in Section 1, appear in boldface type under
the column Name.

The electrical characteristics found in these tables of warranted characteristics
apply when the oscilloscope is adjusted at an ambient temperature between
+20_ C and +30_ C, has had a warm-up period of at least 20 minutes, and is
operating at an ambient temperature between 0_ C and +50_ C (unless
otherwise noted).

Table 2- 9: Warranted Characteristics — Signal Acquisition System

Name Description

Accuracy, DC Voltage Mea- Measurement Type DC Accuracy
surement, Averaged

Accuracy, DC Gain

Accuracy, Offset Volts/Div Setting Offset Accuracy

Accuracy, Position

Analog Bandwidth, DC-50 Ω
Coupled to BNC and Band­width Selection i s Full

3

4

Average of ≥16 waveforms ±(1. 5% × |(reading -- Net Offset1)| + Offset Accuracy +

0.06 div × Vertical Scale)

Delta vol ts between any two
averages of ≥ 16 waveforms

±1.5%

1mV/div--9.95mV/div ±(0.4% × |Net Offset1| + ( 0.9 mV + 0.1 div × Vertical Scale))

10 mV/div--99.5 mV/div ±(0.4% × |Net Offset1| + (1.5 mV + 0.1 div × Vertical Scale))

100 mV/div--995 mV/div ±(0.4% × |Net Offset1|+(15mV+0.1div× Vertical Scale))

1 V/div--10 V/div ±(0.4% × |Net Offset1| + (150 mV + 0.1 div × Vertical Scale)

±(1.5% × (Position × Volts/div) + Offset Accuracy + 0.04 div)

Volts/Div

5mV/div--10V/div

2mV/div--4.98mV/div DC--150 MHz DC--250 MHz

1mV/div--1.99mV/div DC--95 MHz DC--100 MHz

±(1. 5% × |reading| + 0.3 mV + 0.1 div × Vertical Scale)

2

TDS 420A
Bandwidth

DC--200 MHz DC--400 MHz

5

TDS 430A and TDS 460A
Bandwidth

5

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

2- 11

Warranted Characteristics

(

)

pg,

,

Table 2- 9: Warranted Characteristics — Signal Acquisition System (Cont.)

Name Description

Cross Talk (Channel Isolation) Volts/Div Isolation

>500 mV/div ≥40:1 at 50 MHz for any two channels having equal volts/division

settings

≤9.95 mV/div ≥40:1 at 50 MHz for any tw o channels having equal volts/division

settings

10 mV/div --500 mV/div ≥80:1 at 100 MHz and ≥30:1 at full bandwidth for any two

channels having equal volts/division settings

Delay Between Channels, Full
Bandwidth, Equivalent Time

Input Impedance, DC-1 MΩ
Coupled

Input Impedance, DC-50 Ω
Coupled
(TDS 420A)

Input Impedance, DC-50 Ω
Coupled
(TDS 430A and TDS 460A)

Input Voltage, M aximum, Volt/Div Rating
DC-1 MΩ,AC-1MΩ,orGND
Coupled

Input Voltage, M aximum,
DC-50 Ω or AC-50 Ω Coupled

≤200 ps between CH 1 and CH 2 and between CH 3 and CH 4 when both channels have equal
volts/division and coupling settings

≤450 ps for any other combination of two channels with equal volts/division and coupling settings

1MΩ ±0.5% in parallel with 15 pF ±2.0 pF. Matched between channels to within ±1% for resistance
and ±1.0 pF for capacitance

50 Ω ±1% with VSWR ≤1.2:1 from DC--200 MHz

50 Ω ±1% with VSWR ≤1.6:1 from DC--400 MHz

0.1 V/div--10 V/div 300 V CAT II; derate at 20 dB/decade above 10 MHz until the
minimum rating of ±5 V (DC + peak AC) is reached

1 mV/div--99.9 mV/div 300 V CAT II; derate at 20 dB/decade above 10 kHz until the

minimum rating of ±5 V (DC + peak AC) is reached

5V

, with peaks less than or equal to ±30 V

RMS

2- 12

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Warranted Characteristics

Table 2- 9: Warranted Characteristics — Signal Acquisition System (Cont.)

Name Description

Lower Frequency Limit, AC

≤10 Hz when AC--1 MΩ coupled; ≤200 kHz when AC-50 Ω coupled

Coupled

1

Net Offset = Offset - (Position × Volts/Div). Net Offset is the vol tage level at the center of the A-D converter dynam ic
range. Offset Accuracy is the accuracy of this voltage level.

2

The samples must be acquired under the same setup and am bient condi tions.

3

DC Gain Accuracy is confirmed in the Performance Verification Procedure by passing the checks for Offset Accuracy and
DC Voltage Measurement Accuracy (Averaged).

4

Position Accuracy is confirmed in the Performance Verification Procedure by passing the checks for Offset Accuracy and
DC Voltage Measurement Accuracy (Averaged).

5

The limits given are for the ambient temperature range of 0_ Cto+30_ C. Reduce the upper bandwidth frequencies by

2.5 MHz for each _C above +30_ C.

6

The AC Coupled Lower Frequency Limits are reduced by a factor of 10 when 10X, passive probes are used.

6

Table 2- 10: Warranted Characteristics — Time Base System

Name Description

Accuracy, Long Term Sample Rate and
Delay Time

Accuracy, Absolute Tim e and Delay Time
Measurements

1,2

Accuracy, Delta Time
Measurement

1

For input signals ≥ 5 divisions in amplitude and a slew rate of ≥ 2.0 divisions/ns at the delta tim e measurement

1, 2

points. Signal must have been acquired at a volts/division setting ≥ 5 m V/divisi on and not in Events mode.

2

The WI (waveform interval) is the time between the sam ples in the waveform record. Also, see the footnotes for
Sample Rate Range and Equivalent Time or Interpolated Waveform Rates in Table 2- 3 on page 2- 5.

±150 ppm over any ≥ 1 ms interval

For single-shot acquisitions using sample or hi gh-resolution acquisition modes and a
bandwidth limit setting of 100 MHz:

±(1 WI + 150 ppm of |Reading| + 450 ps)

For single-shot acquisitions using sample or hi gh-resolution acquisition modes and a
bandwidth limit setting of 20 MHz:

±(1 WI + 150 ppm of |Reading| + 1.3 ns)

For repetitive acquisitions using average acquisition mode with ≥8 averages and a
bandwidth limit setting of FULL:

±(1 WI + 150 ppm of |Reading| + 200 ps)

For single-shot acquisitions using sample or hi gh-resolution acquisition modes and a
bandwidth limit setting of 100 MHz:

±(1 WI + 150 ppm of |Reading| + 650 ps)

For repetitive acquisitions using average acquisition mode with ≥8 averages and a
bandwidth limit setting of FULL:

±(1 WI + 150 ppm of |Reading| + 300 ps)

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

2- 13

Warranted Characteristics

pgqy,

Table 2- 11: Warrant ed Characteristics — Triggering System

Name Description

Accuracy, Trigger Level or Threshold,
DC Coupled

Sensitivity, Edge-Type Trigger, DC
Coupled

2

Sensitivity, Video-Type, TV Field and TV

2

Line

±(2%of|Setting--NetOffset1|+0.2div× volts/div setting + Offset Accuracy) for any
channel as trigger source and for signals having rise and fall times ≥ 20 ns

0.35 division from DC to 50 MHz, increasing to 1 division at 350 MHz (TDS 420A) or
500 MHz (TDS 430A and TDS 460A) for any channel as trigger source

0.6 division of video sync signal

Pulse Width, minimum, Events-Delay 5ns

Auxiliary Trigger Input, External Clock Input Connector: BNC at rear panel

Input Load: equivalent to three TTL gate loads

Input Voltage (maximum): --5 VDC to +10 VDC (TTL levels recommended)

Auxiliary Trigger, Maximum Input
Frequency

10 MHz

Duty Cycle High and low levels must be stable for ≥ 50 ns

Frequency, External Clock DC to 10 MHz High and low levels must be stable for ≥ 50 ns

1

Net Offset = Offset - (Position × Volts/Div). Net Offset is the voltage level at the center of the A-D converter dynamic
range. Offset Accuracy is the accuracy of this voltage level.

2

The minimum sensitivity for obtaining a stable trigger. A stable trigger results in a uniform, regular display triggered on
the selected slope. The trigger point must not switch between opposite sl opes on the waveform, and the display must not
“roll” across the screen on successive acquisitions. The TRIG’D LED stays constantly lighted when the SEC/DIV setting
is 2 ms or faster but may flash when the SEC/DIV setting is 10 ms or slower.

Table 2- 12: Warranted Characteristics — Probe Compensator Output

Name Description

Output Voltage and Frequency, Characteristic Limits
Probe Compensator

Voltage 0.5 V (base-top) ±5%intoa1MΩ load

Frequency 1 kHz ±5%

Table 2- 13: Warranted Characteristics — Power Requirements

Name Description

Source Voltage and Frequency

Power Consumption ≤250 Watts

2- 14

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

100 to 240 VAC ±10% CAT II, continuous range, for 50 Hz/60 Hz

115 VAC ±10% CAT II, continuous range, for 400 Hz

Warranted Characteristics

Table 2- 14: Warranted Characteristics — Environmental, Safety, and Reliability

Name Description

Atmospherics Temperature1:

Operating, +0_ Cto+50_ C (disk drive operation limited to +4_ C minimum);
Nonoperating, --22_ Cto+60_ C

Relative humidity:

Operating without disk, to 80%, at or below +29_ C; to 20%, at or below +50_ C;
Operating with disk, 20% (+4_ Cto+50_ C) to 80% (+4_ Cto+29_ C) ;
Nonoperating, 20% (+4_ Cto+60_ C) to 90% (+22_ Cto+40_ C)

Altitude:

Operating, to 15,000 ft. (4570 m);
Nonoperating, to 40,000 ft. (12190 m)

1

Maximum operating temperature is decreased 1_ C per 1000 feet (305 meters) above 5000 feet (1525 meters).

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

2- 15

Warranted Characteristics

IEC6100

0--4--2Elec

t

taticdischa

ity(Perf

i

terionB

)

Table 2- 15: Certifications and compliances

Category Standards or description

EC Declaration of Conformit y --

1

EMC

Meets intent of Directive 89/336/EEC for Electromagnetic Compatibility. Compliance was
demonstrated to the fol lowing specifications as listed in the Official Journal of the European
Communities:

EN 61326 EMC requirements for Class A electrical equipment for

measurement, control and laboratory use.

ros

rgeimmun

2

ormancecr
IEC 61000--4--3 RF electromagnetic field immunity3(Performance criterion A)
IEC 61000--4--4 Electrical fast transient / burst immunity (Performance criterion B)
IEC 61000--4--5 Power line surge immunity (Performance criterion B)
IEC 61000--4--6 Conducted RF immunity (Performance criterion A)
IEC 61000--4--11 Voltage dips and interruptions immunity (Performance criterion B)

EN 61000--3--2 AC power line harmonic emissions

Australia / New Zealand
Declaration of Conformity-­EMC

Complies with EMC provision of Radiocommunications Act per the following standard(s):

AS/NZS 2064.1/2 Industrial, Scientific, and Medical Equipment: 1992

FCC Compliance Emissions comply with FCC Code of Federal Regulations 47, Part 15, Subpart B, Class A Limits.

1

To maintain emission requirements when connecting cables to this oscilloscope, use only a high-quality, double-shielded
(braid and foil) cable. The cable shield must have low im pedance connections to both connector housings. Acceptable
cables are listed:
GPIB Tektronix part numbers 012-0991-00, -01, -02 and -03
Centronics Tektronix part number 012-1214-00
RS-232 CA part number 0294-9
VGA Video LCOM part number CTL3VGAMM-5

2

Emissions which exceed the levels required by this standard may occur when this equipment is connected to a test
object.

3

≤ 0.5 division waveform displacement, or ≤ 1.0 division increase in peak-to-peak noise when subj ected to a 3 V/m
electromagnetic field over the frequency range of 80 MHz to 1000 MHz.

2- 16

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Table 2- 15: Certifications and compliances (cont.)

Category Standards or description

Warranted Characteristics

EC Declaration of Conformit y -­Low Voltage

U.S. Nationally Recognized
Testing Laboratory Listing

Canadian Certification CAN/CSA C22.2 No. 1010.1 Safety requirements for electrical equipment for measurement,

Additional Compliance ISA-S82.02.01-1999 Safety standard for electrical and electronic test, measuring,

Installation (Overvoltage)
Category

Pollution Degree A measure of the contaminates that could occur in the environment around and wit hin a product.

Safety Class

Compliance was demonstrated t o the following specification as listed in the Official Journal of the
European Union:

Low Voltage Directive 73/23/EEC, amended by 93/69/EEC

EN 61010-1/A2:1995 Safety requirements for electrical equipment for measurement

control and laboratory use.

UL3111-1 Standard for electrical measuring and test equipment.

control, and laboratory use.

controlling, and related equipment.

IEC61010-1/A2:1995 Safety requirements for electrical equipment for measurement,

control, and laboratory use.

Terminals on this product may have different i nstallation (overvoltage) category designations. The
installation categories are:

CAT III Distribution-level mains (usually permanently connected). Equipment at this level is

typically in a fixed industrial location.

CAT II Local-level mains (wall sockets). Equipment at this level includes appliances, portable

tools, and similar products. Equipment is usually cord-connected.

CAT I Secondary (signal level ) or battery operated circuits of electronic equipment.

Typically the internal environment inside a product is considered to be the same as the external.
Products should be used only in the environment for which they are rated.

Pollution Degree 2 Normally only dry, nonconductive pollution occurs. Occasionally a

temporary conductivity that is caused by condensation must be
expected. This location is a typical office/home environment.
Temporary condensation occurs only when the product is out of
service.

Class 1 (as defined in IE C 1010-1, Annex H) -- grounded product

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

2- 17

Warranted Characteristics

2- 18

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Typical Characteristics

y,g

,

StandardAccessoryProbeAttache

d

This section contains tables that list the various typical characteristics that
describe the

Typical characteristics are described in terms of typical or average performance.
Typical characteristics are not warranted.

This subsection lists only typical characteristics. A list of warranted characteris­tics starts on page 2--11.

Table 2- 16: Typical Characteristics — Signal Acquisition System

Name Description

Accuracy, DC Voltage Measurement, Measurement Type DC Accuracy
Not Averaged

Frequency Limit, Upper, 100 MHz Band­width Limited

Frequency Limit, Upper, 20 MHz Band­width Limited

Nonlinearity

Analog Bandwidth, DC-1 MΩ Coupled with
Standard-Accessory Probe Attached

TDS 400A Digitizing Oscilloscopes.

Any Sample ±(1. 5% × (|reading -- Net Offset1|) + Offset

Accuracy + 0.13 div + 0.6 mV)

Delta Volts between any two sam-

2

ples

100 MHz

20 MHz

<1 DL, different ial; ≤ 1 DL, integral, independently based

Volts/Div TDS 420A

5mV/div--10V/div DC--200 MHz DC--400 MHz

2mV/div--4.98mV/div DC--150 MHz DC--250 MHz

1mV/div--1.99mV/div DC--100 MHz DC--100 MHz

±(1. 5% × |reading| + 0.26 div + 1.2 mV)

Bandwidth

3

TDS 430A and TDS 460A
Bandwidth

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

2- 19

Typical Characteristics

Table 2- 16: Typical Characteristics — Signal Acquisition System (Cont.)

Name Description

Step Response Settling Error Volts/Div Setting Step Ampli-

Settling Error (%)

tude

20 ns 500 ns 20 ms

1 mV/div--99.5 mV/div ≤2V ≤0.5 ≤0.2 ≤0.1

100 mV/div--995 mV/div ≤20 V ≤2.0 ≤0.5 ≤0.2

1 V/div--10 V/div ≤200 V ≤2.0 ≤0.5 ≤0.2

1

Net Offset = Offset - (Position x Volts/Div). Net Offset is the voltage level at the center of the A-D converter dynami c
range. Offset Accuracy is the accuracy of this voltage level.

2

The samples must be acquired under the same setup and am bient condi tions.

3

A DL (digitization level) is the smallest voltage level change that can be resolved by the 8-bit A-D Converter with the input
scaled to the volts/division setting of the channel used. Expressed as a voltage, a DL is equal to 1/25 of a division times
the volts/division setting.

4

The values given are the maximum absolute difference between the val ue at the end of a specified time interval after the
mid-level crossing of the step and the value one second after the mid-level crossing of the step, expressed as a
percentage of the step amplitude.

4

Table 2- 17: Typical Characteristics — Time Base System

Name Description

Aperture Uncertainty For real-time or interpolated records having duration ≤1 minute:

≤(50 ps + 0.03 ppm × Record Duration) RMS

For equivalent time records:

1

≤(50 ps + 0.06 ppm × WI

FixedErrorinSampleTime ≤50 ps

External Clock sampling uncertainty ±8ns

External Clock Edge to Sampling Time
Delay

Sample -- 20 ns (Sample edge is delayed relative the the sample moment.)

Hi Res Hi Res averaging starts within 8 ns of the clock edge.

Averaging stops after 1/(maximum external clock rate

Peak Detect Runs continuously at 100 MS/s

External Clock Minimum Prerecord points 55 points before the first visible sample in the record at the maximum clock speed

35 points before the first visible sample in the record at slow clock speeds

External Clock Minimum Postrecord points 25 points after the last visible sample in the record

1

The WI (waveform interval) is the time between the sam ples in the waveform record. Also, see the footnotes for
Sample Rate Range and Equivalent Time or Interpolated Waveform Rates in Table 2- 3 on page 2- 5.

2

You set the maximum external clock rate using the Horizontal Cl ock m enu.

)RMS

2

)

2- 20

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

Typical Characteristics

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g

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y,ggg,p

Table 2- 18: Typical Characteristics — Triggering System

Name Description

Error, Trigger Position, Edge Triggering Acquire Mode Trigger-Position Error

Sample, Hi-Res, Average ±(1 WI + 1 ns)

Peak Detect, Envelope ±(2 WI + 1 ns)

Holdoff, Variable, Main Trigger, Internal Main Horizontal Scale Minimum Holdoff Maximum Holdoff
Clock and non TV Trigger

≤100 ns/div 1 s 5 × Min Holdoff

≥100 ms/div 1s 5 × Min Holdoff

Otherwise 10 × sec/div 5 × Min Holdoff

Holdoff, Variable, External Clock 0to100ms

Auto Trigger Operation, External Clock Auto triggers 2 s after the last normal trigger or appropriated trigger mode is entered

Lowest Frequency for Successful Opera-

20 Hz

tion of “Set Level to 50%” Function

Sensitivity, Edge Trigger, Not DC Coupled3Trigger Coupling Typical Signal Level for Stable Triggering

AC Same as DC-coupled limits4for frequencies above

60 Hz. Attenuates signals below 60 Hz

Noise Reject Three and one-half times the DC-coupled limits

High Frequency Reject One and one-half times the DC-coupled limits4from

DC to 30 kHz. Attenuates signals above 30 kHz

Low Frequency Reject One and one-half times the DC-coupled limits4for

frequencies above 80 kHz. Attenuates signals bel ow
80 kHz

Video Mode (Option 05 Equipped Instru­ments Only)

Line Rate Class: Four classes are provided as follows
H NTSC, which provides a default line rate compatible with the NTSC standard

(525/60)

1,2

4

H PAL, which provides a default line rate compatible with the PAL standard (625/50)

H SECAM, which provides a default line rate compatible with the SECAM standard

(625/50)

H Custom, which provides user selectable line rate ranges (see Custom Line Rate

Ranges below)

Custom Line Rate Ranges: 15 kHz--20 kHz, 20 kHz--25 kHz, 25 kHz--35 kHz, and
35 kHz--64 kHz

Holdoff: Automatically adjusts to 58 ms (nominal) for NTSC class; to 150 ms (nominal) for
PAL and SECAM. A holdoff of 0 to 100 typically covers a range of 1 to 400 ms

Triggerable on Field Selections: Odd, Even, or Both

Delayed Acquisition: Settable for delay by line number or runs after time delay

Frequency, Maximum for Events Delay

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications

5

90 MHz

2- 21

Typical Characteristics

Table 2- 18: Typical Characteristics — Triggering System (Cont.)

Name Description

Width, Minimum Pulse and Rearm, Events

6

Delay

1

The trigger position errors are typically less than the values given here. These values are for triggering signals having a

5ns

slew rate at the trigger point of ±0.5 division/ns.

2

The waveform interval (WI) is the time between the samples in the waveform record. Also, see the footnote for the
characteristicsSample Rate Range and Equivalent Time or Interpolated Waveform Rates i n Table 2 - 3 on page 2- 5.

3

The minimum sensitivity for obtaining a stable trigger. A stable trigger results in a uniform, regular display triggered on
the selected slope. The trigger point must not switch between opposite sl opes on the waveform, and the display must not
“roll” across the screen on successive acquisitions. The TRIG’D LED stays constantly lighted when the SEC/DIV setting
is 2 ms or faster but may flash when the SEC/DIV setting is 10 ms or slower.

4

See the characteristic Sensitivity, Edge-Type Trigger, DC Coupled in Table 2- 11, which begins on page 2- 14.

5

The maximum frequency for a delaying events input.

6

The minimum pulse width and rearm width required for recognizing a delaying event.

Table 2- 19: Typical Characteristics — Data Handling

Name Description

Time, Data-Retention, Nonvolatile

1,2

Memory

Nonvolatile Memory Save Time 10 seconds

Floppy Disk Drive Capacity 3.5 in. floppy disk, 720 KB or 1.44 MB, compatible with DOS 3.3 format for storing

1

The time that reference waveforms, stored setups, and calibration constants are retained when there is no power to the
oscilloscope.

2

Data is maintained by lithium poly-carbon monofluoride.

Internal batteries, installed at time of manufacture, have a life of ≥5 years when operated
and/or stored at an ambient temperature from 0_ Cto50_ C. Retention time of the
nonvolatile memories is equal to the remaini ng life of the batteries

waveforms, hard copies, and instrument setups

2- 22

TDS 420A, TDS 430A & TDS 460A Performance Verification and Specifications