Tektronix TDS520A, 524A, 540A,,544A Performance Verification Performance Verification
Performance Verification
TDS 520A, 524A, 540A, & 544A
Digitizing Oscilloscopes
070-8712-01
Please check for change information at the rear
of this manual.
First Printing: July 1993.
Instrument Serial Numbers
Each instrument manufactured by Tektronix has a serial number on a panel insert or tag, or
stamped on the chassis. The first letter in the serial number designates the country of
manufacture. The last five digits of the serial number are assigned sequentially and are unique
to each instrument. Those manufactured in the United States have six unique digits. The
country of manufacture is identified as follows:
B010000 Tektronix, Inc., Beaverton, Oregon, USA
E200000 Tektronix United Kingdom, Ltd., London
J300000 Sony/Tektronix, Japan
H700000 Tektronix Holland, NV, Heerenveen, The Netherlands
Instruments manufactured for Tektronix by external vendors outside the United States are
assigned a two digit alpha code to identify the country of manufacture (e.g., JP for Japan, HK
for Hong Kong, IL for Israel, etc.).
Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077
Printed in U.S.A.
Copyright E Tektronix, Inc., 1993. All rights reserved. Tektronix products are covered by U.S.
and foreign patents, issued and pending. The following are registered trademarks:
TEKTRONIX, TEK, TEKPROBE, and SCOPEĆMOBILE.
WARRANTY
Tektronix warrants that this product will be free from defects in materials and workmanship for a period of three (3) years from
the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair
the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty
period and make suitable arrangements for the performance of service. Customer shall be responsible for packaging and
shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid. Tektronix shall
pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service
center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for
products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate maintenance
and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting from attempts by
personnel other than Tektronix representatives to install, repair or service the product; b) to repair damage resulting from
improper use or connection to incompatible equipment; or c) to service a product that has been modified or integrated with
other products when the effect of such modification or integration increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER
WARRANTIES, 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,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
Welcome
This is the Performance Verification for the TDS 520A, 524A, 540A, and 544A
Oscilloscope. It contains procedures suitable for determining if the instruĆ
ment functions, was adjusted properly, and meets the performance characĆ
teristics as warranted.
Also contained in this document are technical specifications for these oscilĆ
loscopes.
Related Manuals
The following documents are related to the use or service of the digitizing
oscilloscope.
H The TDS 520A, 524A, 540A, & 544A User Manual (Tektronix part number
070-8710-01).
H The TDS Family Programmer Manual (Tektronix part number
070-8709-01) describes using a computer to control the digitizing
oscilloscope through the GPIB interface.
H The TDS 520A, 524A, 540A, 544A, & 644A Reference (Tektronix part
number 070-8711-01) gives you a quick overview of how to operate
your digitizing oscilloscope.
H The TDS 520A, 524A, 540A, & 544A Service Manual (Tektronix part
number 070-8713-01) provides information for maintaining and servicĆ
ing your digitizing oscilloscope to the module level.
TDS 520A, 524A, 540A, & 544A Performance Verification
i
Welcome
ii
Welcome
Safety Summary v.............................................
Performance Verification Procedures
Brief Procedures 1Ć1............................................
General Instructions 1Ć1.....................................
Conventions 1Ć2.............................................
Self Tests 1Ć4...............................................
Verify Internal Adjustment, Self Compensation, and
Diagnostics 1Ć4.......................................
Functional Tests 1Ć6.........................................
Verify All Input Channels 1Ć6...............................
Verify the Time Base 1Ć9...................................
Verify the Main and Delayed Trigger Systems 1Ć10.............
Verify the File System (Optional on TDS 520A and 540A) 1Ć12...
Performance Tests 1Ć15...........................................
Prerequisites 1Ć15.........................................
Equipment Required 1Ć16...................................
Test Record 1Ć19..........................................
Signal Acquisition System Checks 1Ć23........................
Check Accuracy of Offset (Zero Setting) 1Ć23..................
Check DC Gain and Voltage Measurement Accuracy 1Ć25......
Check Analog Bandwidth 1Ć32..............................
Check Delay Between Channels 1Ć36........................
Time Base System Checks 1Ć39...............................
Check Accuracy for LongĆTerm Sample Rate, Delay Time,
and Delta Time Measurements 1Ć39......................
Trigger System Checks 1Ć42...................................
Check Accuracy (Time) for PulseĆGlitch or PulseĆWidth
Triggering 1Ć42........................................
Check Accuracy, TriggerĆlevel or Threshold, DC Coupled 1Ć45...
Sensitivity, Edge Trigger, DC Coupled 1Ć48....................
Output Signal Checks 1Ć54....................................
Check Outputs Ċ CH 3 and Main and Delayed Trigger
(TDS 540A and 544A only) 1Ć54..........................
Check Probe Compensator Outputs 1Ć57.....................
Option 05 Video Trigger Checks 1Ć61..........................
Check Video Trigger 1Ć61...................................
Table of Contents
TDS 520A, 524A, 540A, & 544A Performance Verification
iii
Table of Contents
Specifications
Specifications 2Ć1...............................................
General Product Description 2Ć1..............................
User Interface 2Ć2...........................................
Menus 2Ć2...............................................
Indicators 2Ć2............................................
General Purpose Knob 2Ć3.................................
GUI 2Ć3..................................................
Signal Acquisition System 2Ć3................................
Horizontal System 2Ć4.......................................
Trigger System 2Ć5..........................................
Acquisition Control 2Ć6......................................
OnĆBoard User Assistance 2Ć6...............................
Help 2Ć6.................................................
Autoset 2Ć6..............................................
Measurement Assistance 2Ć6.................................
Cursor 2Ć6...............................................
Measure 2Ć7.............................................
Digital Signal Processing (DSP) 2Ć7.........................
Storage and I/O 2Ć7..........................................
Display 2Ć8..................................................
Zoom 2Ć8................................................
Nominal Traits 2Ć9...............................................
Warranted Characteristics 2Ć15...................................
Typical Characteristics 2Ć21.......................................
iv
Contents
Safety Summary
Please take a moment to review these safety precautions. They are provided
for your protection and to prevent damage to the digitizing oscilloscope.
This safety information applies to all operators and service personnel.
Symbols and Terms
These two terms appear in manuals:
H
statements identify conditions or practices that could result in
damage to the equipment or other property.
H statements identify conditions or practices that could result in
personal injury or loss of life.
These two terms appear on equipment:
H CAUTION indicates a personal injury hazard not immediately accessible
as one reads the marking, or a hazard to property including the equipĆ
ment itself.
H DANGER indicates a personal injury hazard immediately accessible as
one reads the marking.
This symbol appears in manuals:
These symbols appear on equipment:
DANGER
High Voltage
TDS 520A, 524A, 540A, & 544A Performance Verification
StaticĆSensitive Devices
Protective
ground (earth)
terminal
ATTENTION
Refer to
manual
v
Safety Summary
Specific Precautions
Observe all of these precautions to ensure your personal safety and to
prevent damage to either the digitizing oscilloscope or equipment conĆ
nected to it.
Power Source
The digitizing oscilloscope is intended to operate from a power source that
will not apply more than 250 V
tween either supply conductor and ground. A protective ground connection,
through the grounding conductor in the power cord, is essential for safe
system operation.
between the supply conductors or beĆ
RMS
Grounding the Digitizing Oscilloscope
The digitizing oscilloscope is grounded through the power cord. To avoid
electric shock, plug the power cord into a properly wired receptacle where
earth ground has been verified by a qualified service person. Do this before
making connections to the input or output terminals of the digitizing oscilloĆ
scope.
Without the protective ground connection, all parts of the digitizing oscilloĆ
scope are potential shock hazards. This includes knobs and controls that
may appear to be insulators.
Use the Proper Power Cord
Use only the power cord and connector specified for your product. Use only
a power cord that is in good condition.
Use the Proper Fuse
To avoid fire hazard, use only the fuse specified in the parts list for your
product, matched by type, voltage rating, and current rating.
Do Not Remove Covers or Panels
To avoid personal injury, do not operate the digitizing oscilloscope without
the panels or covers.
Electric Overload
Never apply to a connector on the digitizing oscilloscope a voltage that is
outside the range specified for that connector.
Do Not Operate in Explosive Atmospheres
The digitizing oscilloscope provides no explosion protection from static
discharges or arcing components. Do not operate the digitizing oscilloscope
in an atmosphere of explosive gases.
vi
Safety
Performance Verification
Procedures
Brief Procedures
The Self Tests use internal routines to confirm basic functionality and proper
adjustment. No test equipment is required to do these test procedures.
The Functional Tests utilize the probeĆcompensation output at the front panel
as a testĆsignal source for further verifying that the oscilloscope functions
properly. A standardĆaccessory probe, included with this oscilloscope, is the
only equipment required.
General Instructions
Besides the Brief Procedures, the set of procedures that can be used to
verify oscilloscope performance includes the Performance Tests, found later
in this section. You may not need to perform all of these procedures, deĆ
pending on what you want to accomplish:
H To rapidly confirm that this oscilloscope functions and was adjusted
properly, just do the procedures under Self Tests, which begin on
page 1Ć4.
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. They can be used 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 1Ć6.
Advantages: These procedures require minimal additional time to
perform, require no additional equipment other than a standardĆaccesĆ
sory probe, and more completely test the internal hardware of this
oscilloscope. They can be used to quickly determine if the oscilloscope
is suitable for putting into service, such as when it is first received.
H If more extensive confirmation of performance is desired, do the PerĆ
formance Tests, beginning on page 1Ć15, 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 1Ć16.)
If you are not familiar with operating this oscilloscope, read the TDS 520A,
524A, 540A, 544A, & 644A Reference or the TDS 520A, 524A, 540A, & 544A
User manual. These contain instructions that acquaint you with the use of
the frontĆpanel controls and the menu system.
TDS 520A, 524A, 540A, & 544A Performance Verification
1Ć1
Brief Procedures
Conventions
Throughout these procedures the following conventions apply:
H Each test procedure uses the following general format:
Title of Test
Equipment Required
Prerequisites
Procedure
H Each procedure consists of as many steps, substeps, and subparts as
required to do the test. Steps, substeps, and subparts are sequenced
as follows:
1. First Step
a. First Substep
H First Subpart
H Second Subpart
b. Second Substep
2. Second Step
H In steps and substeps, the leadĆin statement in italics instructs you what
to do, while the instructions that follow tell you how to do it: in the examĆ
ple step below, Initialize the oscilloscope" by doing Press save/recall
SETUP. Now, press the mainĆmenu button...".
Initialize the oscilloscope: Press save/recall SETUP. Now, press the
mainĆmenu button Recall Factory Setup; then the sideĆmenu
button OK Confirm Factory Init.
H Where instructed to use a frontĆpanel button or knob, or select from a
main or side menu, or verify a readout or status message, the name of
the button or knob appears in boldface type: press SHIFT; then ACĆ
QUIRE MENU", press the mainĆmenu button Coupling", or verify that
the status message is Pass.
The symbol at the left is accompanied by information you must read
to do the procedure properly.
1Ć2
Performance Verification Procedures
Brief Status
Information
Graticule and Waveforms
Waveform Reference
Symbols: Ground Levels
and Waveform Sources
Vertical Scale, Horizontal
Scale, and Trigger Level
Readouts
Brief Procedures
H Refer to Figure 1Ć1: 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. PopĆup menu"
refers to a menu that pops up when a mainĆmenu button is pressed.
Position of Waveform
Record Relative to
the Screen and Display
General Purpose
Knob Readout
PopĆup Menu
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 1Ć1:ăMap of Display Functions
TDS 520A, 524A, 540A, & 544A Performance Verification
1Ć3
Brief Procedures
Self Tests
This procedure uses internal routines to verify that this oscilloscope funcĆ
tions and was adjusted properly. No test equipment or hookups are reĆ
quired.
Verify Internal Adjustment, Self Compensation, and
Diagnostics
Equipment Required: None.
Prerequisites: Power on the Digitizing Oscilloscope and allow a 20 minute
warmĆup before doing this procedure.
Procedure:
1. Verify that internal diagnostics pass: Do the following substeps to verify
passing of internal diagnostics.
a. Display the System diagnostics menu:
H Press SHIFT; then press UTILITY.
H Repeatedly press the mainĆmenu button System until Diag/Err
is highlighted in the popĆup menu.
b. Run the System Diagnostics: Press the mainĆmenu button Execute;
then press the sideĆmenu button OK Confirm Run Test.
c. Wait: The internal diagnostics do an exhaustive verification of proper
oscilloscope function. This verification will take up to two minutes. At
some time during the wait, a clock" icon (shown at left) will appear
onĆscreen. When the verification is finished, the resulting status will
appear on the screen.
d. Confirm no failures are found: Verify that no failures are found and
reported onĆscreen.
e. Confirm the three adjustment sections have passed status:
H Press SHIFT; then press UTILITY.
H Press the main menu button System until Cal is highlighted in
the popĆup menu.
H Verify that the word Pass appears in the main menu under the
following menu labels: Voltage Reference, Frequency ReĆ
sponse, and Pulse Trigger. (See Figure 1Ć2.)
1Ć4
Performance Verification Procedures
First, the CAL menu is displayed.
Second, the adjustment
sections are verified.
Brief Procedures
compensation is run and is
Third, a signal path
verified.
Figure 1Ć2:ăVerifying Adjustments and SignalĆPath Compensation
When doing steps f and g, do not turn off the oscilloscope until
signalĆpath compensation completes. If you interrupt (or lose) power
to the instrument while signalĆpath compensation is running, a
message is logged in the oscilloscope error log. If such a case
occurs, rerun signalĆpath compensation.
f. Run the signalĆpath compensation: Press the mainĆmenu button
Signal Path; then press the sideĆmenu button OK Compensate
Signal Paths.
g. Wait: SignalĆpath compensation runs in about one to two minutes.
While it progresses, a clock" icon (shown at left) is displayed onĆ
screen. When compensation completes, the status message will be
updated to Pass or Fail in the main menu (see step h).
h. Confirm signalĆpath compensation returns passed status: Verify the
word Pass appears under Signal Path in the main menu. (See
Figure 1Ć2.)
2. Return to regular service: Press CLEAR MENU to exit the system meĆ
nus.
TDS 520A, 524A, 540A, & 544A Performance Verification
1Ć5
Brief Procedures
Functional Tests
The purpose of these procedures is to confirm that this oscilloscope funcĆ
tions properly. The only equipment required is one of the standardĆaccessoĆ
ry probes and, to check the file system, a 3.5 inch. 720 K or 1.44 Mbyte
floppy disk.
These procedures verify functions; that is, they verify that oscilloĆ
scope features operate. They do not verify that they operate within
limits.
Therefore, when the instructions in the functional tests that follow
call for you to verify that a signal appears onĆscreen that is about
five divisions in amplitude" or has a period of about six horizontal
divisions", etc., do NOT interpret the quantities given as limits.
Operation within limits is checked in Performance Tests, which begin
on page 1Ć15.
DO NOT make changes to the frontĆpanel settings that are not
called out in the procedures. Each verification procedure will require
you to set the oscilloscope to certain default settings before verifying
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: One P6139A probe.
Prerequisites: None.
Procedure:
1. Install the test hookup and preset the oscilloscope controls:
Figure 1Ć3:ăUniversal Test Hookup for Functional Tests
a. Hook up the signal source: Install the probe on CH 1. Connect the
probe tip to PROBE COMPENSATION SIGNAL on the front panel;
connect the probe ground to PROBE COMPENSATION GND.
1Ć6
Performance Verification Procedures
Brief Procedures
b. Initialize the oscilloscope:
H Press save/recall SETUP.
H Press the mainĆmenu button Recall Factory Setup.
H Press the sideĆmenu button OK Confirm Factory Init.
2. Verify that all input channels operate: Do the following substeps Ċ 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 frontĆpanel 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 horizontal SCALE to 200 ms. Press CLEAR MENU to
remove any menu that may be on the screen.
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 200 mV, and a squareĆwave probeĆcompensation
signal about 2.5 divisions in amplitude is onĆscreen. (See FigĆ
ure 1Ć1 on page 1Ć3 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 onĆscreen, turning the knob
clockwise increases the amplitude, and returning the knob to
200 mV returns the amplitude to about 2.5 divisions.
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 onĆ
screen. (Note that there is noise present on the peaks of the
square wave.)
H Peak Detect mode displays an actively acquiring waveform
onĆscreen with the noise present in Sample mode peak deĆ
tected."
TDS 520A, 524A, 540A, & 544A Performance Verification
1Ć7
Brief Procedures
H Hi Res mode displays an actively acquiring waveform onĆscreen
with the noise that was present in Sample mode reduced.
H Envelope mode displays an actively acquiring waveform onĆ
screen with the noise displayed.
H Average mode displays an actively acquiring waveform onĆ
screen with the noise reduced like in Hi Res mode.
TDS 520A and 524A only: Substep e will have you repeat the preĆ
vious substeps to check all input channels. Be sure to check only
CH 1 and CH 2 when testing the TDS 520A or 524A. (Step 3 will test
the AUX 1 and AUX 2 inputs.) When testing the TDS 540A or 544A,
test all four channels, CH 1 through CH 4.)
e. Test all channels: Repeat substeps a through d until all four input
channels are verified.
3. TDS 520A and 524A Only: Verify auxiliary inputs operate: Perform the
following substeps when checking the AUX 1 and AUX 2 inputs only.
a. Select an auxiliary channel:
H Press WAVEFORM OFF to remove from display the channel just
verified.
H Press the frontĆpanel button that corresponds to the channel
you are to verify.
H Move probe to the channel you selected.
b. Set up the selected channel: Press AUTOSET to obtain a viewable
display in the selected channel.
The display obtained might not trigger stably because autoset
cannot provide more than about ½ division of probe compensation
signal amplitude in an auxiliary channel equipped with a 10X probe.
This amount is less than the minimum trigger sensitivity for auxiliary
channel trigger sources; therefore, triggering is not required.
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 1 V, and a squareĆwave probeĆcompensation signal
about ½ division in amplitude is onĆscreen. (See Figure 1Ć1 on
page 1Ć3 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 to 10 V
decreases the amplitude of the waveform onĆscreen. (The
amplitude will drop to near zero when doing this substep.)
1Ć8
H Returning the knob to 1 V returns the amplitude to about ½
division.
d. Verify that the channel acquires in all acquisition modes: Disconnect
the probe ground lead from the probeĆcompensation terminal. Do
step 2, substep d to verify the five acquire modes.
Performance Verification Procedures
Brief Procedures
e. Test all channels: Repeat substeps a through d to verify AUX 2.
4. Remove the test hookup: Disconnect the probe from the channel input
and the probeĆcompensation terminals.
Verify the Time Base
Equipment Required: One P6139A probe.
Prerequisites: None.
Procedure:
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 COMPENSATION SIGNAL on the front panel;
connect the probe ground to PROBE COMPENSATION GND. (See
Figure 1Ć3 on page 1Ć6.)
b. Initialize the oscilloscope:
H Press save/recall SETUP.
H Press the mainĆmenu button Recall Factory Setup; then press
the sideĆmenu button OK Confirm Factory Init.
c. Modify default settings:
H Press AUTOSET to obtain a viewable, triggered display.
H Set the horizontal SCALE to 200 ms.
H Press CLEAR MENU to remove the menus from the screen.
2. Verify that the time base operates: Confirm the following statements.
a. One period of the squareĆwave probeĆcompensation signal is about
five horizontal divisions onĆscreen for the 200 ms horizontal scale
setting (set in step 1c).
b. Rotating the horizontal SCALE knob clockwise expands the waveĆ
form onĆscreen (more horizontal divisions per waveform period), and
that counterclockwise rotation contracts it, and that returning the
horizontal scale to 200 ms returns the period to about five divisions.
c. The horizontal POSITION knob positions the signal left and right
onĆscreen when rotated.
3. Remove the test hookup: Disconnect the probe from the channel input
and the probeĆcompensation terminals.
TDS 520A, 524A, 540A, & 544A Performance Verification
1Ć9
Brief Procedures
Verify the Main and Delayed Trigger Systems
Equipment Required: One P6139A probe.
Prerequisites: None.
Procedure:
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 COMPENSATION SIGNAL on the front panel;
connect the probe ground to PROBE COMPENSATION GND. (See
Figure 1Ć3 on page 1Ć6.)
b. Initialize the oscilloscope:
H Press save/recall SETUP.
H Press the mainĆmenu button Recall Factory Setup.
H Press the sideĆmenu 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 ms.
H Press TRIGGER MENU.
H Press the mainĆmenu button Mode & Holdoff.
H Press the sideĆmenu 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
with the trigger LEVEL knob.
H The triggerĆlevel knob can trigger and untrigger the squareĆwave
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:
1Ć10
H Press HORIZONTAL MENU.
H Press the mainĆmenu button Time Base.
H Press the sideĆmenu button Delayed Triggerable; then press
the sideĆmenu button Delayed Only.
H
Set the horizontal SCALE for the D (delayed) time base to
200 ms.
Performance Verification Procedures
Brief Procedures
b. Select the delayed trigger level menu:
H Press SHIFT; then press DELAYED TRIG.
H Press the mainĆmenu button Level; then press the sideĆmenu
button Level.
c. Confirm that the following statements are true:
H The triggerĆlevel readout for the delayed trigger system changes
as you turn the general purpose knob.
H The general purpose knob can trigger and untrigger the squareĆ
wave probeĆcompensation signal as you rotate it. (Leave the
signal untriggered.)
H Pressing the sideĆmenu button Set to 50% triggers the probeĆ
compensation signal that you just left untriggered. (Leave the
signal triggered.)
d. Verify the delayed trigger counter:
H Press the mainĆmenu button Delay by Time.
H Use the keypad to enter a delay time of 1 second (press 1 then
press ENTER).
H Verify that the trigger READY indicator on the front panel flashes
about once every second as the waveform is updated onĆ
screen.
4. Remove the test hookup: Disconnect the standardĆaccessory probe from
the channel input and the probeĆcompensation terminals.
TDS 520A, 524A, 540A, & 544A Performance Verification
1Ć11
Brief Procedures
Verify the File System (Optional on TDS 520A and 540A)
Equipment Required: One P6139A probe and one 720 K or 1.44 Mbyte, 3.5
inch DOS compatible disk. You can use a disk of your own or you can use
the Programming Examples Software 3.5 inch disk (Tektronix part number
063-1134-00) contained in the TDS Family Programmer Manual (Tektronix
part number 070-8709-01).
Prerequisites: None.
Procedure:
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 COMPENSATION SIGNAL on the front panel;
connect the probe ground to PROBE COMPENSATION GND. (See
Figure 1Ć3 on page 1Ć6.)
b. Insert the test disk: Insert the disk in the disk drive to the left of the
monitor.
H Position the disk so the metal shutter faces the drive.
H Position the disk so the stamped arrow is on the top right side.
In other words, place the angled corner in the front bottom
location.
H Push the disk into the drive until it goes all the way in and clicks
into place.
c. Initialize the oscilloscope:
H Press save/recall SETUP.
H Press the mainĆmenu button Recall Factory Setup.
H Press the sideĆmenu button OK Confirm Factory Init.
d. 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 ms
(one click clockwise). Notice the waveform on the display now
shows two cycles instead of five.
H Press CLEAR MENU to remove the menus from the screen.
e. Save the settings:
H Press SETUP.
H Press the mainĆmenu button Save Current Setup; then press
the sideĆmenu button To File.
H Turn the general purpose knob to select the file to save. Choose
TEK?????.SET (or fdo:). With this choice, you'll save a file
starting with TEK, then containing 5Ćnumbers, and a .SET
extension. For example, the first time you run this on a blank,
formatted disk or on the Example Programs Disk, the TDS will
assign the name TEK00000.SET to your file. If you ran the
procedure again, the TDS would increment the name and call
the file TEK00001.SET.
1Ć12
Performance Verification Procedures
H Press the sideĆmenu button Save To Selected File.
2. Verify the file system works:
H Press AUTOSET to restore the 500 ms time base and the five
cycle waveform.
H Press the mainĆmenu button Recall Saved Setup; then press
the sideĆmenu button From File.
H 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 TDS assign the name TEK00000.SET to
your file.
H Press the sideĆmenu button Recall From Selected File.
H Verify that Digitizing Oscilloscope retrieved the saved setup from
the disk. Do this by noticing the horizontal SCALE for the M
(main) time base is again 200 ms and the waveform shows only
two cycles just as it was when you saved the setup.
3. Remove the test hookup:
Brief Procedures
H Disconnect the standardĆaccessory probe from the channel
input and the probeĆcompensation terminals.
H Remove the disk from the disk drive. Do this by pushing in the
tab at the bottom of the disk drive.
TDS 520A, 524A, 540A, & 544A Performance Verification
1Ć13
Brief Procedures
1Ć14
Performance Verification Procedures
Performance Tests
This subsection contains a collection of procedures for checking that TDS
520A, 524A, 540A, and 544A Digitizing Oscilloscopes perform as warranted.
Since the procedures cover models with both two fullĆfeatured channels
(TDS 520A and 524A) and four fullĆfeatured models (TDS 540A and 544A),
instructions that apply only to one of the model types are clearly identified.
Otherwise, all test instructions apply to both the two and four channel
models.
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 Section 2, Specifications. (The characteristics that are
checked appear in boldface type under Warranted Characteristics in
Section 2.)
These procedures extend the confidence level provided by the basic
procedures described on page 1Ć1. The basic procedures should be
done first, then these procedures performed if desired.
Prerequisites
The tests in this subsection 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 1Ć4, and those under Functional Tests, found on
page 1Ć6.
H A signalĆpath compensation must have been done within the recomĆ
mended calibration interval and at a temperature within ±5_ĂC 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_ĂC and +30_ĂC, must have been operating
for a warmĆup period of at least 20 minutes, and must be operating at an
ambient temperature between +4_ĂC and +50_ĂC. (The warmĆup reĆ
quirement is usually met in the course of meeting the first prerequisite
listed above.)
Related Information Ċ Read General Instructions and Conventions that
start on page 1Ć1.
TDS 520A, 524A, 540A, & 544A Performance Verification
1Ć15
Performance Tests
Equipment Required
These procedures use external, traceable signal sources to directly check
warranted characteristics. The required equipment list is shown in Table 1Ć1.
TableĂ1Ć1:ăTest Equipment
Item Number and
Minimum Requirements Example Purpose
Description
1 Attenuator,10X
(three required)
Ratio: 10X; impedance 50 W;
connectors: female BNC inĆ
put, male BNC output
2 Attenuator, 5X Ratio: 5X; impedance 50 W;
connectors: female BNC inĆ
put, male BNC output
3 Terminator, 50 W Impedance 50 W; connectors:
female BNC input, male BNC
output
4 Cable, Precision
50 W Coaxial
50 W, 36 inch, male to male
BNC connectors
(two required)
5 Connector, DuĆ
Female BNC to dual banana Tektronix part number
alĆBanana (two
required)
6 Connector, BNC
Male BNC to dual female BNC Tektronix part number
T"
7 Coupler, DualĆ
Input
Female BNC to dual male
BNC
Tektronix part number
011-0059-02
Tektronix part number
011-0060-02
Tektronix part number
011-0049-01
Tektronix part number
012-0482-00
103-0090-00
103-0030-00
Tektronix part number
067-0525-02
Signal Attenuation
Signal Attenuation
Signal Termination
for Channel Delay
Test
Signal InterconnecĆ
tion
Various Accuracy
Tests
Checking Trigger
Sensitivity
Checking Delay
Between Channels
8 Generator, DC
Calibration
9 Generator, CaliĆ
bration
Variable amplitude to ±110 V;
accuracy to 0.1%
500 mV square wave calibraĆ
tor amplitude; accuracy to
Data Precision 8200, with
1 kV option installed
PG 506A
0.25%
10 Generator, LevĆ
eled Sine Wave,
MediumĆFreĆ
200 kHz to 250 MHz; Variable
amplitude from 5ĂmV to
5.5 V
into 50 W
pĆp
Tektronix SG 503 Leveled Sine
Wave Generator
quency
11 Generator, LevĆ
eled Sine Wave,
HighĆFrequency
250 MHz to 500 MHz; Variable
amplitude from 500 mV to
V
into 50 W; 6 MHz
4
pĆp
Tektronix SG 504 Leveled Sine
Wave Generator
ing Head
reference
12 Generator, Time
Mark
Variable marker frequency
from 10 ms to 10 ns; accuraĆ
Tektronix TG 501 Time
Mark Generator
cy within 2 ppm
13 Generator, CaliĆ
bration
500 mV square wave calibraĆ
tor amplitude; accuracy to
PG 506A
0.25%
1 Requires a TM 500 or TM 5000 Series Power Module Mainframe.
Checking DC Offset,
Gain, and MeasureĆ
ment Accuracy
1
To check accuracy
of the CH 3 Signal
Out (TDS 540A and
544A only)
Checking Trigger
1
Sensitivity at low freĆ
quencies
Checking Analog
1
with its LevelĆ
Bandwidth and TrigĆ
ger Sensitivity at
high frequencies
Checking SampleĆ
1
Rate and DelayĆtime
Accuracy
1
Use to check accuĆ
racy of the CH 3
Output
1Ć16
Performance Verification Procedures
TableĂ1Ć1:ăTest Equipment (Cont.)
Performance Tests
Item Number and
Description
14 Probe, 10X, inĆ
cluded with this
instrument
15 Adapter, BNC
female to Clip
Leads
16 Power Supply,
Dual Output
17 3.5 inch, 720 K
or 1.44 Mbyte,
DOSĆcompatible
floppy disk
18 Generator,
Video Signal
19 Oscillator, LevĆ
eled Sinewave
Generator
PurposeExampleMinimum Requirements
A P6139A probe Tektronix number P6139A Signal InterconnecĆ
tion
BNC female to Clip Leads Tektronix part number
013-0076-00
Signal Coupling for
Probe Compensator
Output Check
0-35 V and 60 V 2 A; current
limit without foldback
Tektronix PS 280 Power Supply Power Supply
Troubleshooting
Programming Examples SoftĆ
ware Disk (Tektronix part numĆ
ber 063-1134-00) that comes
Checking File SysĆ
tem Basic FunctionĆ
ality
with the TDS Family ProgramĆ
mer Manual (Tektronix part
number 070-8709-01)
Provides NTSC compatible
outputs.
Tektronix TSG 121 Used to Test Video
Option 05 Equipped
Instruments Only
60 Hz. Sine Wave Tektronix part number SG 502 Used to Test Video
Option 05 Equipped
Instruments Only
20 Pulse Generator Tektronix part number PG 502 Used to Test Video
Option 05 Equipped
Instruments Only
21 Cable, 75 W
Coaxial
75 W, 36 inch, male to male
BNC connectors
Tektronix part number
012-1338-00
Used to Test Video
Option 05 Equipped
Instruments Only
22 Termination,
75 W
Impedance 75 W; connectors:
female BNC input, male BNC
output
Tektronix part number
011-0102-01
Used to Test Video
Option 05 Equipped
Instruments Only
TDS 520A, 524A, 540A, & 544A Performance Verification
1Ć17
Performance Tests
1Ć18
Performance Verification Procedures
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