Tektronix TDS684A, TDS744A, TDS784A Reference manual
Technical Reference
TDS 684A, TDS 744A, & TDS 784A
Digitizing Oscilloscope
Performance Verification and Specifications
070-8990-04
Please check for change information
at the rear of this manual.
Fifth Edition: January 1995
Copyright T ektronix, Inc. 1994, 1995. All rights reserved.
T ektronix 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 privileges reserved.
Printed in the U.S.A.
T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.
WARRANTY
T ektronix 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, T ektronix, 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 T ektronix, with shipping charges prepaid.
T ektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the
T ektronix 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. T ektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than T ektronix representatives to install, repair or service the product; b) to repair
damage resulting from improper use or connection to incompatible equipment; or c) to service a product that has been
modified or integrated with other products when the effect of such modification or integration increases the time or
difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY
OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUST OMER 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.
Table of Contents
General Safety Summary iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance V erification Procedures
Conventions 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brief Procedures 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self Tests 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional T ests 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Tests 1–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Prerequisites 1–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Required 1–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDS 684A T est Record 1–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDS 7XXA T est Record 1–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal Acquisition System Checks 1–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Time Base System Checks 1–42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trigger System Checks 1–44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Signal Checks 1–57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 05 Video Trigger Checks 1–65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
Product Description 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User Interface 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal Acquisition System 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horizontal System 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trigger System 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Acquisition Control 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On-Board User Assistance 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measurement Assistance 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nominal Traits 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warranted Characteristics 2–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Characteristics 2–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
i
Table of Contents
ii
TDS 684A, TDS 744A, & TDS 784A 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.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
Injury Precautions
Use Proper Power Cord
Avoid Electric Overload
Ground the Product
Do Not Operate Without
Covers
Use Proper Fuse
Do Not Operate in
Wet/Damp Conditions
Do Not Operate in
Explosive Atmosphere
To avoid fire hazard, use only the power cord specified for this product.
To avoid electric shock or fire hazard, do not apply a voltage to a terminal that is
outside the range specified for that terminal.
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.
To avoid electric shock or fire hazard, do not operate this product with covers or
panels removed.
To avoid fire hazard, use only the fuse type and rating specified for this product.
To avoid electric shock, do not operate this product in wet or damp conditions.
To avoid injury or fire hazard, do not operate this product in an explosive
atmosphere.
Product Damage Precautions
Use Proper Power Source
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Do not operate this product from a power source that applies more than the
voltage specified.
iii
General Safety Summary
Provide Proper Ventilation
Do Not Operate With
Suspected Failures
Do Not Immerse in Liquids
To prevent product overheating, provide proper ventilation.
If you suspect there is damage to this product, have it inspected by qualified
service personnel.
Clean the probe using only a damp cloth. Refer to cleaning instructions.
Safety Terms and Symbols
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
iv
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.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
General Safety Summary
Symbols on the Product
The following symbols may appear on the product:
DANGER
High Voltage
Certifications and Compliances
CSA Certified Power
Cords
CSA Certification includes the products and power cords appropriate for use in
the North America power network. All other power cords supplied are approved
for the country of use.
Protective Ground
(Earth) T erminal
ATTENTION
Refer to
Manual
Double
Insulated
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
v
General Safety Summary
vi
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Preface
Related Manuals
This is the Performance Verification and Specifications for the TDS 684A and
7XXA Oscilloscopes. It contains procedures suitable for determining if each
instrument functions, was adjusted properly, and meets the performance
characteristics as warranted.
Also contained in this document are technical specifications for these oscilloscopes.
The following documents are related to the use or service of the digitizing
oscilloscope:
H The TDS 684A, TDS 744A, & TDS 784A User Manual (Tektronix part
number 070-8991-XX).
H The TDS Family Programmer Manual (Tektronix part number
070-8709-XX) describes using a computer to control the digitizing oscilloscope through the GPIB interface.
H The TDS 684A, TDS 744A, & TDS 784A Reference (Tektronix part number
070-8999-XX) gives you a quick overview of how to operate your digitizing
oscilloscope.
H The TDS 684A, TDS 744A, & TDS 784A Service Manual (Tektronix part
number 070-8992-XX) provides information for maintaining and servicing
the digitizing oscilloscope to the module level.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
vii
Preface
viii
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Verification
Procedures
Performance Verification Procedures
Two types of Performance Verification 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 the oscilloscope functions and was adjusted properly,
just do the brief 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. 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 brief 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 the 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 Perform-
ance Tests, beginning on page 1–15, after doing the Functional and Self Tests
just referenced.
Advantages: These procedures add direct checking of warranted specifica-
tions. They require more time to perform and suitable test equipment is
required. (See Equipment Required beginning on page 1–16.)
If you are not familiar with operating this oscilloscope, read the TDS 684A, TDS
744A, & TDS 784A Reference (070-8999-XX) or the TDS 684A, TDS 744A, &
TDS 784A User Manual (070-8991-XX). These contain instructions that will
acquaint you with the use of the front-panel controls and the menu system.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–1
Performance Verification Procedures
Conventions
Throughout these procedures the following conventions apply:
H Each test procedure uses the following general format:
H Each procedure consists of as many steps, substeps, and subparts as required
Title of Test
Equipment Required
Prerequisites
Procedure
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 lead-in statement in italics instructs you what to
do, while the instructions that follow tell you how to do it, as 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, press the
main-menu button Recall Factory Setup; then the side-menu button OK
Confirm Factory Init.
H Where instructed to use a front-panel button or knob, or select from a main
or side menu, or verify a readout or status message, the name of the button or
knob appears in boldface type: “press SHIFT; then UTILITY, press the
main-menu button System until Cal is highlighted in the pop-up menu.
Verify that the status message is Pass in the main menu under the Voltage
Reference label.”
STOP. The symbol at the left is accompanied by information you must read to do
the procedure properly.
1–2
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
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Verification Procedures
the five buttons to the right of the display. “Pop-up menu” refers to a menu
that pops up when a main-menu button is pressed.
Brief status
information
Graticule and waveforms
Waveform reference
symbols show ground levels
and waveform sources
Vertical scale, horizontal scale,
and trigger level readouts
Pop-up menu
Position of waveform
record relative to
the screen and display
General purpose
knob readout
Side menu area.
Readouts for
measurements
move here when
CLEAR MENU
is pressed.
Figure 1–1: Map of Display Functions
Main menu display area. Readouts in lower graticule
area move here when CLEAR MENU is pressed.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–3
Performance Verification Procedures
1–4
TDS 684A, TDS 744A, & TDS 784A 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 utilize the probe-compensation output at the front panel as
a test-signal source for further verifying that the oscilloscope functions properly.
A probe, such as the P6245, is required to do these test procedures.
This procedure uses internal routines to verify that the oscilloscope functions and
was adjusted properly. 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
passing of internal diagnostics.
a. Display the System diagnostics menu:
H Press SHIFT; then press UTILITY.
H Repeatedly press the main-menu button System until Diag/Err is
highlighted in the pop-up menu.
b. Run the System Diagnostics:
H First disconnect any input signals from all four channels.
H 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 will take up to three and a half
minutes on some models. At some time during the wait, a “clock” icon
(shown at left) will appear on-screen. When the verification is finished,
the resulting status will appear 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 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–5
Brief Procedures
e. Confirm the three adjustment sections have passed status:
H Press SHIFT; then press UTILITY.
H Highlight Cal in the pop-up menu by repeatedly pressing the
main-menu button System. See Figure 1–2.
H Verify that the word Pass appears in the main menu under the
following menu labels: Voltage Reference, Frequency Response,
and Pulse Trigger. See Figure 1–2.
f. Run the signal-path compensation: Press the main-menu button Signal
Path; then press the side-menu button OK Compensate Signal Paths.
g. Wait: Signal-path compensation may take five minutes on the
TDS 7XXA or fifteen minutes on the 684A to run. While it progresses, a
“clock” icon (shown at left) is displayed on-screen. When compensation
completes, the status message will be updated to Pass or Fail in the
main menu. See step h.
h. Confirm signal-path compensation returns passed status: Verify that the
word Pass appears under Signal Path in the main menu. See Figure 1–2.
1–6
Highlight Cal
1
3
Verify Pass
2
Verify Pass
Figure 1–2: Verifying Adjustments and Signal-Path Compensation
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Functional Tests
Brief Procedures
2. Return to regular service: Press CLEAR MENU to exit the system menus.
The purpose of these procedures is to confirm that the oscilloscope functions
properly. The only equipment required is one of the standard-accessory probes
and, to check the file system, a 3.5 inch, 720 K or 1.44 Mbyte floppy disk.
CAUTION. The optional P6245 probes that can be used with this oscilloscope
provide an extremely low loading capacitance (<1 pF) to ensure the best
possible signal reproduction. These probes should not be used to measure
signals exceeding ±8 volts, or errors in signal measurement will be observed.
Above 40 volts, damage to the probe may result. To make measurements beyond
±10 volts, use either the P6139A probe (good to 500 volts), or refer to the
catalog for a recommended probe.
STOP. These procedures verify functions; that is, they verify that the 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,” etc., do NOT interpret the
quantities given as limits. Operation within limits is checked in Performance
Tests, which begin on page 1–15.
STOP. DO NOT make changes to the front-panel settings that are not called out
in the procedures. Each verification procedure will require you to set the
oscilloscope to certain default settings before verifying 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.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–7
Brief Procedures
Verify All Input Channels
Equipment
Required
Prerequisites None
One probe such as the P6245 or P6139A
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 (typically black) to PROBE COMPENSA-
TION GND. If using a P6245 probe, you may want to attach a Y-lead
connector and two SMD KlipChips as shown in Figure 1–3.
1–8
Signal Gnd
Figure 1–3: Universal Test Hookup for Functional Tests – TDS 684A Shown
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 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Brief Procedures
2. Verify that all channels operate: Do the following substeps — test CH 1
first, skipping substep a and b since CH 1 is already set up for verification
and as the trigger source from step 1.
a. Select an unverified channel:
H Press WAVEFORM OFF to remove the channel just verified from
display.
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. Match the trigger source to the channel selected:
H Press TRIGGER MENU.
H Press the main-menu button Source.
H Press the side-menu button that corresponds to the channel selected
(Ch2, Ch3, or Ch4).
c. Set up the selected channel:
H Set the vertical SCALE to 200 mV.
H Set the horizontal SCALE to 200 s. Press CLEAR MENU to
remove any menu that may be on the screen.
d. 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 square-wave probe-compensation signal about
2.5 divisions in amplitude is on-screen. See Figure 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 200 mV returns
the amplitude to about 2.5 divisions.
e. 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 three 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.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–9
Brief Procedures
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 (TDS 7XXA only) displays an actively acquiring
waveform on-screen with the noise present in Sample mode “peak
detected.”
H Hi Res mode (TDS 7XXA only) 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.
f. Test all channels: Repeat substeps a through e until all four input
channels are verified.
3. Remove the test hookup: Disconnect the probe from the channel input and
the probe-compensation terminals.
Verify the Time Base
Equipment
Required
Prerequisites None
One probe such as the P6245 or P6139A
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 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.
c. Modify default settings:
H Set the vertical SCALE to 200 mV.
H Set the horizontal SCALE to 200 s.
1–10
H Press CLEAR MENU to remove the menus from the screen.
2. Verify that the time base operates: Confirm the following statements.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Brief Procedures
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.
3. Remove the test hookup: Disconnect the probe from the channel input and
the probe-compensation terminals.
Verify the Main and
Delayed Trigger Systems
Equipment
Required
Prerequisites None
One probe such as the P6245 or P6139A
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 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 Set the vertical SCALE to 200 mV.
H Set the horizontal SCALE for the M (main) time base to 200 s.
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.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–11
Brief Procedures
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 trigger-LEVEL knob can trigger and untrigger the square-wave
signal as you rotate it. (Leave the signal untriggered, which is indicated
by the display not updating.)
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; then press DELAYED 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 as
you turn the general purpose knob.
H As you rotate the general purpose knob, the square-wave probe-com-
pensation signal can become triggered and untriggered. (Leave the
signal untriggered, which is indicated by the display not updating.)
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:
1–12
H Press the main-menu button Delay by Time.
H Use the keypad to enter a delay time of 1 second. Press 1, then press
ENTER.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Brief Procedures
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 probe from the channel input and
the probe-compensation terminals.
Verify the File System
Equipment
Required
Prerequisites None
One probe such as the P6245 or P6139A
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 063-1 134-XX)
contained in the TDS Family Programmer Manual (Tektronix part
number 070-8709-XX).
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 1–3 on page 1–8.
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 main-menu button Recall Factory Setup.
H Press the side-menu button OK Confirm Factory Init.
d. Modify default settings:
H Set the vertical SCALE to 200 mV.
H Set the horizontal SCALE for the M (main) time base to 200 s.
Notice the waveform on the display now shows two cycles instead of
five.
H Press CLEAR MENU to remove the menus from the screen.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–13
Brief Procedures
e. Save the settings:
H Press SETUP.
H Press the main-menu button Save Current Setup; then press the
side-menu button To File.
H Turn the general purpose knob to select the file to save. Choose
(or ). With this choice, you will save a file
starting with , then containing 5-numbers, and a extension.
For example, the first time you run this on a blank, formatted disk or
on the Example Programs Disk, the oscilloscope will assign the
name to your file. If you ran the procedure again, the
oscilloscope would increment the name and call the file
.
H Press the side-menu button Save To Selected File.
2. Verify the file system works:
H Press the main-menu button Recall Factory Setup and the side-menu
button OK Confirm Factory Init to restore the 500 s time base and
the five cycle waveform.
H Press the main-menu button Recall Saved Setup; then press the
side-menu 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
oscilloscope assign the name TEK00000.SET to your file.
H Press the side-menu 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 s and the waveform shows only two cycles just as it
was when you saved the setup.
3. Remove the test hookup:
H Disconnect the probe from the channel input and the probe-compensa-
tion terminals.
H Remove the disk from the disk drive. Do this by pushing in the tab at the
bottom of the disk drive.
1–14
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
This section contains a collection of procedures for checking that the TDS 684A
and 7XXA Digitizing Oscilloscopes perform as warranted.
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
Specifications. (The characteristics that are checked appear in boldface type
under Warranted Characteristics in Specifications.)
STOP. These procedures extend the confidence level provided by the basic
procedures described on page 1–5. The basic procedures should be done first,
then these procedures performed if desired.
Prerequisites
The tests in this section 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 +4_ C and either +45_ C for the TDS 684A or +50_ C
for the TDS 7XXA. (The warm-up requirement is usually met in the course
of meeting the first prerequisite listed above.)
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–15
Performance Tests
Equipment Required
T able 1–1: Test Equipment
Item Number and
Description
These procedures use external, traceable signal sources to directly check
warranted characteristics. The required equipment list follows this introduction.
Minimum Requirements Example Purpose
1. Attenuator ,10X
(two required)
Ratio: 10X; impedance 50 ; connectors: female BNC input, male BNC
Tektronix part number
01 1-0059-02
output
2. Attenuator , 5X Ratio: 5X; impedance 50 ; connec-
tors: female BNC input, male BNC
Tektronix part number
01 1-0060-02
output
3. Adapter, BNC female to
Clip Leads
4. Terminator, 50 Impedance 50 ; connectors: female
5. Cable, Precision 50
Coaxial (two required)
6. Connector , Dual-Banana
(two required)
BNC female to Clip Leads Tektronix part number
013-0076-00
Tektronix part number
BNC input, male BNC output
50 , 36 in, male to male BNC
connectors
01 1-0049-01
Tektronix part number
012-0482-00
Female BNC to dual banana Tektronix part number
103-0090-00
7. Connector , BNC “T” Male BNC to dual female BNC Tektronix part number
103-0030-00
8. Coupler, Dual-Input Female BNC to dual male BNC Tektronix part number
067-0525-02
9. Generator , DC Calibration
10. Generator, Calibration 500 mV square wave calibrator
Variable amplitude to ±104 V; accuracy to 0.1%
Data Precision 8200 Checking DC Offset, Gain,
Tektronix PG 506A
1
amplitude; accuracy to 0.25%
11. Generator,
Leveled Sine Wave,
200 kHz to 250 MHz; Variable amplitude from 5 mV to 4 V
into 50
p-p
Tektronix SG 503 Leveled
Sine Wave Generator
Medium-Frequency
12. Generator, Leveled Sine
Wave, High-Frequency
13. Generator, Time Mark Variable marker frequency from 10 ms
14. Probe, 10X A P6139A or P6245 probe
250 MHz to 1 GHz; Variable amplitude from 500 mV to 4 V
into 50 ;
p-p
6 MHz reference
to 10 ns; accuracy within 2 ppm
2
Tektronix SG 504 Leveled
Sine Wave Generator
SG 504 Output Head
Tektronix TG 501A Time
Mark Generator
1
Tektronix part number
P6139A or P6245
1
1
with
Signal Attenuation
Signal Attenuation
Signal Coupling for Probe
Compensator Output Check
Signal Termination for Channel Delay Test
Signal Interconnection
Various Accuracy Tests
Checking Trigger Sensitivity
Checking Delay Between
Channels
and Measurement Accuracy
To check accuracy of CH 3
Signal Out
Checking Trigger Sensitivity
at low frequencies
Checking Analog Bandwidth
and Trigger Sensitivity at high
frequencies
Checking Sample-Rate and
Delay-time Accuracy
Signal Interconnection
1–16
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
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