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
T able 1–1: Test Equipment (Cont.)
Item Number and
Description
Performance Tests
PurposeExampleMinimum Requirements
15. 3.5 inch, 720 K or
1.44 Mbyte, DOS-compatible floppy disk
16. Generator, Video Signal Provides PAL compatible outputs Tektronix TSG 121 Used to Test Video Option 05
17. Oscillator, Leveled Sine
wave Generator
18. Pulse Generator Tektronix part number PG 502 Used to Test Video Option 05
19. Cable, Coaxial
(two required)
20. Terminator, 75
(two required)
1
Requires a TM 500 or TM 5000 Series Power Module Mainframe.
2
Warning: The optional P6245 probes that may 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 V , or errors in signal measurement will be observed. Above 40 V, damage to the probe may result.
To make measurements beyond ±8 V, use either the P6139A probe (good to 500 V), or refer to the catalog for a recommended probe.
60 Hz. Sine wave Tektronix part number SG 502 Used to Test Video Option 05
75 , 36 in, male to male BNC
connectors
Impedance 75 ; connectors: female
BNC input, male BNC output
Programming Examples
Software Disk (Tektronix part
number 063-1134-XX) that
comes with the TDS Family
Programmer Manual (Tektronix part number
070-8709-XX)
Tektronix part number
012-1338-00
Tektronix part number
01 1-0102-01
Checking File System Basic
Functionality
Equipped Instruments Only
Equipped Instruments Only
Equipped Instruments Only
Used to Test Video Option 05
Equipped Instruments Only
Used to Test Video Option 05
Equipped Instruments Only
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–17
Performance Tests
1–18
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
TDS 684A Test Record
Photocopy this and the next three pages and use them to record the performance
test results for your TDS 684A.
TDS 684A T est Record
Instrument Serial Number: Certificate Number:
Temperature: RH %:
Date of Calibration: Technician:
TDS 684A Performance Test Minimum Incoming Outgoing Maximum
Offset Accuracy
CH1 Offset +1 mV
+101 mV
+1.01 V
CH2 Offset +1 mV
+101 mV
+1.01 V
CH3 Offset +1 mV
+101 mV
+1.01 V
CH4 Offset +1 mV
+101 mV
+1.01 V
DC Voltage Measurement Accuracy (Averaged)
CH1 5 mV Vert scale setting,
–5 Div position setting, +1 V offset
CH1 5 mV Vert scale setting,
+5 Div position setting, –1 V offset
CH1 200 mV Vert scale setting,
–5 Div position setting, +10 V offset
CH1 200 mV Vert scale setting,
+5 Div position setting, –10 V offset
CH1 1 V Vert scale setting,
–5 Div position setting, +10 V offset
CH1 1 V Vert scale setting,
+5 Div position setting, –10 V offset
CH2 5 mV Vert scale setting,
–5 Div position setting, +1 V offset
CH2 5 mV Vert scale setting,
+5 Div position setting, –1 V offset
CH2 200 mV Vert scale setting,
–5 Div position setting, +10 V offset
– 1.45 mV
– 69.1 mV
– 691 mV
– 1.45 mV
– 69.1 mV
– 691 mV
– 1.45 mV
– 69.1 mV
– 691 mV
– 1.45 mV
– 69.1 mV
– 691 mV
+ 1.029 V __________ __________ + 1.0513 V
– 1.0513 V __________ __________ – 1.029 V
+ 11.420 V __________ __________ + 11.786 V
– 11.786 V __________ __________ – 11.420 V
+ 17.26 V __________ __________ + 18.76 V
– 18.76 V __________ __________ – 17.26 V
+ 1.029 V __________ __________ + 1.0513 V
– 1.0513 V __________ __________ – 1.029 V
+ 11.420 V __________ __________ + 11.786 V
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
+ 1.45 mV
+ 69.1 mV
+ 691 mV
+ 1.45 mV
+ 69.1 mV
+ 691 mV
+ 1.45 mV
+ 69.1 mV
+ 691 mV
+ 1.45 mV
+ 69.1 mV
+ 691 mV
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–19
Performance Tests
TDS 684A T est Record (Cont.)
Instrument Serial Number: Certificate Number:
Temperature: RH %:
Date of Calibration: Technician:
TDS 684A Performance Test MaximumOutgoingIncomingMinimum
CH2 200 mV Vert scale setting,
+5 Div position setting, –10 V offset
CH2 1 V Vert scale setting,
–5 Div position setting, +10 V offset
CH2 1 V Vert scale setting,
+5 Div position setting, –10 V offset
CH3 5 mV Vert scale setting,
–5 Div position setting, +1 V offset
CH3 5 mV Vert scale setting,
+5 Div position setting, –1 V offset
CH3 200 mV Vert scale setting,
–5 Div position setting, +10 V offset
CH3 200 mV Vert scale setting,
+5 Div position setting, –10 V offset
CH3 1 V Vert scale setting,
–5 Div position setting, +10 V offset
CH3 1 V Vert scale setting,
+5 Div position setting, –10 V offset
CH4 5 mV Vert scale setting,
–5 Div position setting, +1 V offset
CH4 5 mV Vert scale setting,
+5 Div position setting, –1 V offset
CH4 200 mV Vert scale setting,
–5 Div position setting, +10 V offset
CH4 200 mV Vert scale setting,
+5 Div position setting, –10 V offset
CH4 1 V Vert scale setting,
–5 Div position setting, +10 V offset
CH4 1 V Vert scale setting,
+5 Div position setting, –10 V offset
Analog Bandwidth
CH1 100 mV 424 mV __________ __________ N/A
CH2 100 mV 424 mV __________ __________ N/A
CH3 100 mV 424 mV __________ __________ N/A
CH4 100 mV 424 mV __________ __________ N/A
– 11.786 V __________ __________ – 11.420 V
+ 17.26 V __________ __________ + 18.76 V
– 18.76 V __________ __________ – 17.26 V
+ 1.029 V __________ __________ + 1.0513 V
– 1.0513 V __________ __________ – 1.029 V
+ 11.420 V __________ __________ + 11.786 V
– 11.786 V __________ __________ – 11.420 V
+ 17.26 V __________ __________ + 18.76 V
– 18.76 V __________ __________ – 17.26 V
+ 1.029 V __________ __________ + 1.0513 V
– 1.0513 V __________ __________ – 1.029 V
+ 11.420 V __________ __________ + 11.786 V
– 11.786 V __________ __________ – 11.420 V
+ 17.26 V __________ __________ + 18.76 V
– 18.76 V __________ __________ – 17.26 V
1–20
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
TDS 684A T est Record (Cont.)
Instrument Serial Number: Certificate Number:
Temperature: RH %:
Date of Calibration: Technician:
TDS 684A Performance Test MaximumOutgoingIncomingMinimum
Delay Between Channels
Delay Between Channels N/A __________ __________ 100 ps
Time Base System
Long Term Sample Rate/
Delay Time @ 500 ns/10 ms
Trigger System Accuracy
Pulse-Glitch or Pulse-Width,
Hor. scale ≤ 1 ms
Lower Limit
Upper Limit
Pulse-Glitch or Pulse-Width,
Hor. scale > 1 ms
Lower Limit
Upper Limit
Main Trigger, DC Coupled, Positive Slope 9.863 V __________ __________ 10.137 V
Main Trigger, DC Coupled, Negative Slope 9.863 V __________ __________ 10.137 V
Delayed Trigger, DC Coupled, Positive Slope 9.863 V __________ __________ 10.137 V
Delayed Trigger, DC Coupled, Negative Slope 9.863 V __________ __________ 10.137 V
CH1 Sensitivity, 50 MHz, Main Pass/Fail __________ __________ Pass/Fail
CH1 Sensitivity , 50 MHz, Delayed Pass/Fail __________ __________ Pass/Fail
CH1 AUX Trigger Input Pass/Fail __________ __________ Pass/Fail
CH1 Sensitivity, 1 GHz, Main Pass/Fail __________ __________ Pass/Fail
CH1 Sensitivity, 1 GHz, Delayed Pass/Fail __________ __________ Pass/Fail
Output Signal Checks
MAIN TRIGGER OUTPUT, 1 MW
High
Low
MAIN TRIGGER OUTPUT, 50 W
High
Low
DELA YED TRIGGER OUTPUT, 50 W
DELA YED TRIGGER OUTPUT, 1 MW
–2.0 Div __________ __________ +2.0 Div
2.5 ns
2.5 ns
1 ms
1 ms
High ≥ 2.5 V __________
High ≥ 1.0 V __________
High ≥ 1.0 V __________
High ≥ 2.5 V __________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
7.5 ns
7.5 ns
3 ms
3 ms
Low ≤ 0.7 V
Low ≤ 0.25 V
Low ≤ 0.25 V
Low ≤ 0.7 V
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–21
Performance Tests
TDS 684A T est Record (Cont.)
Instrument Serial Number: Certificate Number:
Temperature: RH %:
Date of Calibration: Technician:
TDS 684A Performance Test MaximumOutgoingIncomingMinimum
CH 3 SIGNAL OUTPUT, 1 M Pk-Pk ≥ 80 mV __________ __________ Pk-Pk ≤ 120 mV
CH 3 SIGNAL OUTPUT, 50 Pk-Pk ≥ 40 mV __________ __________ Pk-Pk ≤ 60 mV
Probe Compensator Output Signal
Frequency (CH1 Freq.) 950 Hz __________ __________ 1.050 kHz
Voltage (difference) 495 mV __________ __________ 505 mV
1–22
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
TDS 7XXA Test Record
Photocopy this and the next three pages and use them to record the performance
test results for your TDS 7XXA.
TDS 7XXA T est Record
Instrument Serial Number: Certificate Number:
Temperature: RH %:
Date of Calibration: Technician:
TDS 7XXA Performance Test Minimum Incoming Outgoing Maximum
Offset Accuracy
CH1 Offset +1 mV
+101 mV
+1.01 V
CH2 Offset +1 mV
+101 mV
+1.01 V
CH3 Offset +1 mV
+101 mV
+1.01 V
CH4 Offset +1 mV
+101 mV
+1.01 V
DC Voltage Measurement Accuracy (Averaged)
CH1 5 mV Vert scale setting,
–5 Div position setting, +1 V offset
CH1 5 mV Vert scale setting,
+5 Div position setting, –1 V offset
CH1 200 mV Vert scale setting,
–5 Div position setting, +10 V offset
CH1 200 mV Vert scale setting,
+5 Div position setting, –10 V offset
CH1 1 V Vert scale setting,
–5 Div position setting, +10 V offset
CH1 1 V Vert scale setting,
+5 Div position setting, –10 V offset
CH2 5 mV Vert scale setting,
–5 Div position setting, +1 V offset
CH2 5 mV Vert scale setting,
+5 Div position setting, –1 V offset
CH2 200 mV Vert scale setting,
–5 Div position setting, +10 V offset
– 1.6 mV
– 25.1 mV
– 251 mV
– 1.6 mV
– 25.1 mV
– 251 mV
– 1.6 mV
– 25.1 mV
– 251 mV
– 1.6 mV
– 25.1 mV
– 251 mV
+ 1.0355 V __________ __________ + 1.0445 V
– 1.0445 V __________ __________ – 1.0355 V
+ 11.5385 V __________ __________ + 11.6615 V
– 11.6615 V __________ __________ – 11.5385 V
+ 17.7785 V __________ __________ + 18.2215 V
– 18.2215 V __________ __________ – 17.7785 V
+ 1.0355 V __________ __________ + 1.0445V
– 1.0445 V __________ __________ – 1.0355 V
+ 11.5385 V __________ __________ + 11.6615 V
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
+ 1.6 mV
+ 25.1 mV
+ 251 mV
+ 1.6 mV
+ 25.1 mV
+ 251 mV
+ 1.6 mV
+ 25.1 mV
+ 251 mV
+ 1.6 mV
+ 25.1 mV
+ 251 mV
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–23
Performance Tests
TDS 7XXA T est Record (Cont.)
Instrument Serial Number: Certificate Number:
Temperature: RH %:
Date of Calibration: Technician:
TDS 7XXA Performance Test MaximumOutgoingIncomingMinimum
CH2 200 mV Vert scale setting,
+5 Div position setting, –10 V offset
CH2 1 V Vert scale setting,
–5 Div position setting, +10 V offset
CH2 1 V Vert scale setting,
+5 Div position setting, –10 V offset
CH3 5 mV Vert scale setting,
–5 Div position setting, +1 V offset
CH3 5 mV Vert scale setting,
+5 Div position setting, –1 V offset
CH3 200 mV Vert scale setting,
–5 Div position setting, +10 V offset
CH3 200 mV Vert scale setting,
+5 Div position setting, –10 V offset
CH3 1 V Vert scale setting,
–5 Div position setting, +10 V offset
CH3 1 V Vert scale setting,
+5 Div position setting, –10 V offset
CH4 5 mV Vert scale setting,
–5 Div position setting, +1 V offset
CH4 5 mV Vert scale setting,
+5 Div position setting, –1 V offset
CH4 200 mV Vert scale setting,
–5 Div position setting, +10 V offset
CH4 200 mV Vert scale setting,
+5 Div position setting, –10 V offset
CH4 1 V Vert scale setting,
–5 Div position setting, +10 V offset
CH4 1 V Vert scale setting,
+5 Div position setting, –10 V offset
Analog Bandwidth
CH1 100 mV 424 mV __________ __________ N/A
CH2 100 mV 424 mV __________ __________ N/A
CH3 100 mV 424 mV __________ __________ N/A
CH4 100 mV 424 mV __________ __________ N/A
– 11.6615 V __________ __________ – 11.5385 V
+ 17.7785 V __________ __________ + 18.2215 V
– 18.2215 V __________ __________ – 17.7785 V
+ 1.0355 V __________ __________ + 1.0445 V
– 1.0445 V __________ __________ – 1.0355 V
+ 11.5385 V __________ __________ + 11.6615 V
– 11.6615 V __________ __________ – 11.5385 V
+ 17.7785 V __________ __________ + 18.2215 V
– 18.2215 V __________ __________ – 17.7785 V
+ 1.0355 V __________ __________ + 1.0445 V
– 1.0445 V __________ __________ – 1.0355 V
+ 11.5385 V __________ __________ + 11.6615 V
– 11.6615 V __________ __________ – 11.5385 V
+ 17.7785 V __________ __________ + 18.2215 V
– 18.2215 V __________ __________ – 17.7785 V
1–24
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
TDS 7XXA T est Record (Cont.)
Instrument Serial Number: Certificate Number:
Temperature: RH %:
Date of Calibration: Technician:
TDS 7XXA Performance Test MaximumOutgoingIncomingMinimum
Delay Between Channels
Delay Between Channels N/A __________ __________ 50 ps
Time Base System
Long Term Sample Rate/
Delay Time @ 100 ns/10.0 ms
Trigger System Accuracy
Pulse-Glitch or Pulse-Width,
Hor. scale ≤ 1 ms
Lower Limit
Upper Limit
Pulse-Glitch or Pulse-Width,
Hor. scale > 1 ms
Lower Limit
Upper Limit
Main Trigger, DC Coupled, Positive Slope 9.9393 V __________ __________ 10.1147 V
Main Trigger, DC Coupled, Negative Slope 9.9393 V __________ __________ 10.1147 V
Delayed Trigger, DC Coupled, Positive Slope 9.9393 V __________ __________ 10.1 147 V
Delayed Trigger, DC Coupled, Negative Slope 9.9393 V __________ __________ 10.1147 V
CH1 Sensitivity, 50 MHz, Main Pass/Fail __________ __________ Pass/Fail
CH1 Sensitivity , 50 MHz, Delayed Pass/Fail __________ __________ Pass/Fail
CH1 AUX Trigger Input Pass/Fail __________ __________ Pass/Fail
CH1 Sensitivity , full bandwidth, Main Pass/Fail __________ __________ Pass/Fail
CH1 Sensitivity , full bandwidth, Delayed Pass/Fail __________ __________ Pass/Fail
Output Signal Checks
MAIN TRIGGER OUTPUT, 1 MW
High
Low
MAIN TRIGGER OUTPUT, 50 W
High
Low
DELA YED TRIGGER OUTPUT, 50 W
High
Low
DELA YED TRIGGER OUTPUT, 1 MW
High
Low
–2.5 Div __________ __________ +2.5 Div
3.5 ns
2.5 ns
1.9 ms
1.9 ms
High ≥ 2.5 V __________
High ≥ 1.0 V __________
High ≥ 1.0 V __________
High ≥ 2.5 V __________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
6.5 ns
6.5 ns
2.1 ms
2.1 ms
Low ≤ 0.7 V
Low ≤ 0.25 V
Low ≤ 0.25 V
Low ≤ 0.7 V
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–25
Performance Tests
TDS 7XXA T est Record (Cont.)
Instrument Serial Number: Certificate Number:
Temperature: RH %:
Date of Calibration: Technician:
TDS 7XXA Performance Test MaximumOutgoingIncomingMinimum
CH 3 SIGNAL OUTPUT, 1 M Pk-Pk ≥ 88 mV __________ __________ Pk-Pk ≤ 132 mV
CH 3 SIGNAL OUTPUT, 50 Pk-Pk ≥ 44 mV __________ __________ Pk-Pk ≤ 66 mV
Probe Compensator Output Signal
Frequency (CH1 Freq.) 950 Hz __________ __________ 1.050 kHz
Voltage (difference) 495 mV __________ __________ 505 mV
1–26
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
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 Specifica-
tions.
Performance Tests
Check Offset Accuracy
(Zero Setting)
Equipment
Required
Prerequisites The oscilloscope must meet the prerequisites listed on page 1–15
1. 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.
H Press CLEAR MENU to remove the menus from the screen.
b. Modify the default settings:
H Press SHIFT; then press ACQUIRE MENU.
H On the TDS 684A, press the main-menu button Mode; then press
the side-menu button Average 16.
H On the TDS 7XXA, press the main-menu button Mode; then press
the side-menu button Hi Res.
None
H Press CURSOR.
H Press the main-menu button Function; then press the side-menu
button H Bars.
H Press CLEAR MENU.
H Be sure to disconnect any input signals from all four channels.
2. Confirm input channels are within limits for offset accuracy at zero offset:
Do the following substeps — test CH 1 first, skipping substep a since CH 1
is already set up to be checked from step 1.
a. Select an unchecked channel: 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.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–27
Performance Tests
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.)
H Press VERTICAL MENU. Press the main-menu button Fine Scale.
H Use the keypad to enter the vertical scale. For the 1 mV setting,
press 1, SHIFT, m, then ENTER. For the 101 mV setting, press
101, SHIFT, m, then ENTER. For the 1.01 V setting, press 1.01,
then ENTER.
H Press CLEAR MENU.
T able 1–2: DC Offset Accuracy (Zero Setting)
Vertical
Vertical Scale
Setting
1 mV 0 ±1.45 mV ±1.6 mV
Position and
Offset Setting
TDS 684A Offset
1
Accuracy Limits
TDS 7XXA Offset
Accuracy Limits
101 mV 0 ±69.1 mV ±25.1 mV
1.01 V 0 ±691 mV ±251 mV
1
Vertical position is set to 0 divisions and vertical offset to 0 V when the
oscilloscope is initialized in step 1.
c. Display the test signal: The waveform position and offset were
initialized for all channels in step 1 and are displayed as you select each
channel and its vertical scale.
d. Measure the test signal: Align the active cursor over the waveform by
rotating the general purpose knob. Ignore the other cursor. See
Figure 1–4.
e. Read the measurement results at the absolute (@:) cursor readout, not
the delta (D:) readout on screen. That is, read the offset relative to the
ground reference. See Figure 1–4.
f. Check against limits: Do the following subparts in the order listed.
H CHECK that the measurement results are within the limits listed for
the current vertical scale setting.
H Enter voltage on test record.
1–28
H Repeat substeps b through f until all vertical scale settings listed in
Table 1–2, are checked for the channel under test.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Read the
measurement
results.
Performance Tests
2
Align the active cursor
over the waveform.
1
Check DC Voltage
Measurement Accuracy
Figure 1–4: Measurement of DC Offset Accuracy at Zero Setting
g. Test all channels: Repeat substeps a through f for all input channels.
3. Disconnect the hookup: No hookup was required.
WARNING. The generator is capable of outputting dangerous voltages. Be sure to
set the DC calibration generator to 0 volts before connecting, disconnecting,
and/or moving the test hookup during the performance of this procedure.
Equipment
Required
Prerequisites The oscilloscope must meet the prerequisites listed on page 1–15
Two dual-banana connectors (Item 6)
One BNC T connector (Item 7)
One DC calibration generator (Item 9)
Two precision coaxial cables (Item 5)
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–29
Performance Tests
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 W 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 W precision coaxial cable to
the other side of the BNC T connector. Now connect the BNC T
connector to CH 1. See Figure 1–5.
Output Sense
DC Calibrator
Dual Banana to
BNC Adapters
Figure 1–5: Initial T est 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 Coaxial Cables
Digitizing Oscilloscope
BNC T
Connector
1–30
H Press SHIFT; then press ACQUIRE MENU.
H Press the main-menu button Mode; then press the side-menu button
Average 16.
2. Confirm input channels are within limits for DC accuracy at maximum offset
and position: Do the following substeps — test CH 1 first, skipping substep
2a since CH 1 is already selected from step 1.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
a. Select an unchecked channel:
H Press WAVEFORM OFF to remove the channel just confirmed
from the display.
H Press the front-panel button that corresponds to the channel you are
to confirm.
H Set the generator output to 0 V.
H Move the test hookup to the channel you selected.
b. Turn on the measurement Mean for the channel:
H Press MEASURE, then press the main-menu button Select
Measrmnt for CHx.
H Press the side-menu button more until the menu label Mean appears
in the side menu (its icon is shown at the left). Press the side-menu
button Mean.
H Press CLEAR MENU.
c. Set the vertical scale: Set the vertical SCALE to one of the settings
listed in Table 1–3 that is not yet checked. (Start with the first setting
listed.)
T able 1–3: DC Accuracy
Position
Scale
Setting
5 mV –5 +1 V +1.040 V +1.029 V to +1.0513 V +1.0355 V to +1.0445 V
200 mV –5 +10 V +11.6 V +11.420 V to +11.786 V +1 1.5385 V to +11.6615 V
1 V –5 +10 V +18V +17.26 V to +18.76 V +17.7785 V to +18.2215 V
Setting
(Divs)
+5 V –1 V –1.040 V –1.0513 V to –1.029 V –1.0445 V to –1.0355 V
+5 –10 V –11.6 V –11.786 V to –11.420 V –11.6615 V to –11.5385 V
+5 –10 V –18 V –18.76 V to –17.26 V –18.2215 V to –17.7785 V
Offset
Setting
Generator
Setting
TDS 684A
Accuracy Limits
TDS 7XXA
Accuracy Limits
d. Display the test signal:
H Press VERTICAL MENU. Press the main-menu button Position.
H Use the keypad to set vertical position to –5 divisions (press –5, then
ENTER, on the keypad). The baseline level will move off screen.
H Press the main-menu button Offset.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–31
Performance Tests
H Use the keypad to set vertical offset to the positive-polarity setting
listed in the table for the current vertical scale setting. The baseline
level will remain off screen.
H Set the generator to the level and polarity indicated in the table for
the vertical scale, position, and offset settings you have made. The
DC test level should appear on screen. (If it doesn’t return, the DC
accuracy check is failed for the current vertical scale setting of the
current channel.)
e. Measure the test signal: Press CLEAR MENU. Read the measurement
results at the Mean measurement readout. See Figure 1–6.
Turn on the
measurement called
mean and read the
results here.
Figure 1–6: Measurement of DC Accuracy at Maximum Offset and Position
f. Check against limits:
H CHECK that the readout for the measurement Mean readout on
screen is within the limits listed for the current vertical scale and
position/offset/generator settings. Enter value on test record.
H Repeat substep d, reversing the polarity of the position, offset, and
generator settings as is listed in the table.
1–32
H CHECK that the Mean measurement readout on screen is within the
limits listed for the current vertical scale setting and position/offset/
generator settings. Enter value on test record.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
H Repeat substeps c through f until all vertical scale settings, listed in
Table 1–3, are checked for the channel under test.
g. Test all channels: Repeat substeps a through f for all four channels.
3. Disconnect the hookup:
a. Set the generator output to 0 V.
b. 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 high-frequency leveled sine wave generator and its leveling head
(Item 12)
Two10X attenuators (Item 1)
1. Install the test hookup and preset the instrument controls:
a. Initialize the oscilloscope:
H Press save/recall SETUP. Press the main-menu button Recall
Factory Setup; then press the side-menu button OK Confirm
Factory Init.
b. Modify the default settings:
H Press TRIGGER MENU. Press the main-menu button Coupling.
H Press the side-menu button Noise Rej.
H Turn the horizontal SCALE knob to 50 ns. Press SHIFT; then press
ACQUIRE MENU.
H Press the main-menu button Mode; then press the side-menu button
Average 16.
H Press MEASURE. Press the main-menu button High–Low Setup;
then press the side-menu button Min–Max.
c. Hook up the test-signal source: Connect, through its leveling head, the
sine wave output of a high-frequency leveled sine wave generator to
CH 1. Set the output of the generator to a reference frequency of 6 MHz.
See Figure 1–7.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–33
Performance Tests
High Frequency
Sine Wave
Generator
Output
Leveling Head
Digitizing Oscilloscope
Figure 1–7: Initial T est Hookup
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 leveling head to the channel you selected.
b. Match the trigger source to the channel selected:
H Press TRIGGER MENU. Press the main-menu button Source; then
press the side-menu button that corresponds to the channel selected.
c. Set its input impedance:
H Press VERTICAL MENU; then press the main-menu button
Coupling.
H Press the side-menu button to toggle it to the 50 setting.
d. Set the vertical scale: Set the vertical SCALE to one of the settings
listed in Table 1–4 not yet checked. (Start with the 100 mV setting.)
1–34
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
T able 1–4: Analog Bandwidth
TDS 684A
and 784A
Attenuators
Vertical Scale
100 mV none 600 mV (6 divisions) 1 ns 1 GHz 500 MHz ≥424 mV
1 V none 5 V (5 divisions) 1 ns 1 GHz 500 MHz ≥3.535 V
500 mV none 3 V (6 divisions) 1 ns 1 GHz 500 MHz ≥2.121 V
200 mV none 1.2 V (6 divisions) 1 ns 1 GHz 500 MHz ≥848 mV
50 mV 1 300 mV (6 divisions) 1 ns 1 GHz 500 MHz ≥212 mV
20 mV 1 120 mV (6 divisions) 1 ns 1 GHz 500 MHz ≥84.8 mV
10 mV 1 60 mV (6 divisions) 1 ns 1 GHz 500 MHz ≥42.4 mV
5mV 2 30 mV (6 divisions) 1 ns 750 MHz 500 MHz ≥21.2 mV
2mV 2 12 mV (6 divisions) 1 ns 600 MHz 500 MHz ≥8.48 mV
1mV 2 6 mV (6 divisions) 1 ns 500 MHz 450 MHz ≥4.24 mV
(10X)
Reference Amplitude (at
6 MHz)
Horizontal
Scale
Test
Frequency
TDS 744A
Test
Frequency
Limits
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
Measrmnt for CHx.
H 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 Repeatedly press the side-menu button –more– until Frequency
appears in the side menu (its icon is shown at the left). Press the
side-menu button Frequency.
H Press CLEAR MENU.
H Set the generator output so the CHx Pk-Pk readout equals the
reference amplitude in Table 1–4 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. At full bandwidth, which for the TDS
684A/784A = 1 GHz and for the 744A = 500 MHz frequency, you
may also want to make small, manual adjustments to the trigger
level. You can use the TRIGGER LEVEL knob to do this.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–35
Performance Tests
f. Measure the test signal:
H Set the frequency of the generator, as shown on screen, to the test
frequency in Table 1–4 that corresponds to the vertical scale set in
substep d. See Figure 1–8.
H Set the horizontal SCALE to the horizontal scale setting in
Table 1–4 that corresponds to the vertical scale set in substep d.
Press SET LEVEL TO 50% as necessary to trigger the signal.
H Read the results at the CHx Pk-Pk readout, which will automatically
measure the amplitude of the test signal. See Figure 1–8.
Read results.
Set the generator
(reference) frequency to
the test frequency from
Table 1–4.
Set the horizontal scale
from Table 1–4.
3
1
2
Figure 1–8: Measurement of Analog Bandwidth
g. Check against limits:
H CHECK that the Pk-Pk readout on screen is within the limits listed
in Table 1–4 for the current vertical scale setting.
1–36
H Enter voltage on test record.
H When finished checking, set the horizontal SCALE back to the
50 ns setting.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
STOP. Checking each channel’s bandwidth at all vertical scale settings is time
consuming and unnecessary. You may skip checking the remaining vertical scale
settings in Table 1–4 (that is, skip the following substep, h) if this digitizing
oscilloscope has performed as follows:
H Passed the 100 mV vertical scale setting just checked in this
procedure.
H Passed the Verify Internal Adjustment, Self Compensation, and
Diagnostics procedure found under Self Tests, on page 1–5.
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):
Check Delay Between
Channels
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 1–4 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 leveling head
and the channel input as needed to obtain the six division reference
signals listed in the table.
i. Test all channels: Repeat substeps a through g for all four 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 medium-frequency leveled sine wave generator (Item 1 1)
One precision coaxial cable (Item 5)
One 50 terminator (Item 4)
One dual-input coupler (Item 8)
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–37
Performance Tests
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 instrument controls:
a. Initialize the front panel:
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 initialized front-panel control settings:
H Do not adjust the vertical position of any channel during this
procedure.
H Set the horizontal SCALE to 500 ps.
H Press SHIFT; then press ACQUIRE 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, through a 50 W precision coaxial cable followed by a 50 W
termination, the sine wave output of a medium-frequency sine wave
generator to a dual-input coupler. See Figure 1–9.
H Connect the coupler to both CH 1 and CH 2. See Figure 1–9.
Medium
Frequency Sine
Wave Generator
Output
Digitizing Oscilloscope
Dual Input
Coupler
1–38
50 Terminator
Figure 1–9: Initial T est Hookup
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
2. Confirm all four channels (CH 1 through CH 4) are within limits for channel
delay:
a. Set up the generator: Set the generator frequency to 250 MHz and the
amplitude for about six 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. The horizontal SCALE should already be set to 500 ps. On the TDS
784A, now set it to 200 ps. On the TDS 744A, push the front-panel
ZOOM button, press the side-menu On button, set the horizontal
SCALE to 250 ps, and be sure the vertical scale factor is kept at 1.0X
and the horizontal scale factor is 2.0X.
c. Save a CH 2 waveform: Press CH 2. Be sure the vertical scale factor is
kept at 1.0X. Then press save/recall WAVEFORM. Now, press the
main-menu button Save Wfm; then press the side-menu button
To Ref 2.
d. Save CH 3 waveform:
H Move the coupler from CH 2 to CH 3, so that CH 1 and CH 3 are
driven. Press WAVEFORM OFF. Press CH 3. Be sure the vertical
scale factor is kept at 1.0X. Then press the side-menu button
To Ref 3.
e. Display all test signals:
H Press WAVEFORM OFF to remove CH 3 from the display.
H Display the live waveform. Move the coupler from CH 3 to CH 4,
so that CH 1 and CH 4 are driven. Press CH 4 to display. Be sure
the vertical scale factor is kept at 1.0X. See Figure 1–10 on page
1–40.
H Display the reference waveforms. To do this, press the front-panel
button MORE. Press the main-menu buttons Ref 2 and Ref 3. You
may notice their overlapping ground reference indicators. See Figure
1–10 on page 1–40.
f. Measure the test signal:
H Locate the time reference points for these waveforms. Do this by
first identifying the point where the rising edge of the left-most
waveform crosses the center horizontal graticule line. Next, note the
corresponding time reference point for the right-most waveform. See
Figure 1–10 on page 1–40.
H Press CURSOR.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–39
Performance Tests
H Press the main-menu button Function; then press the side-menu
button V Bars.
H Press CLEAR MENU.
H Align one V bar 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 by rotating the General Purpose knob.
(Press SELECT to switch between the two cursors.) See Figure
1–10 on page 1–40.
H Read the measurement results at the D: cursor readout, not the @:
readout on screen.
Read results.
Display the waveforms.
4
1
2
Locate the time reference
points for these waveforms.
Align each cursor to the time
3
reference points
Figure 1–10: Measurement of Channel Delay – TDS 684A Shown
1–40
g. Check against limits: CHECK that the cursor readout on screen is
≤100 ps for the TDS 684A or ≤50 ps for the TDS 744A/784A.
h. If the channel skew is within the limits, enter time on the test record and
proceed to step 3. Otherwise, proceed with steps i through p.
i. Use the cursors to measure the skew from CH1 to CH2, CH1 to CH3,
and CH1 to CH4. Write down these three numbers in the first measure-
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
ment column of Table 1–5. Note that these numbers may be either
positive or negative.
j. Repeat the procedure from step 1.c through 2.e., 4th bullet item.
k. Again use the cursors to measure the skew from CH1 to CH2, CH1 to
CH3, and CH1 to CH4. Write down these numbers in the second
measurement column of Table 1–5. Note that these numbers may be
either positive or negative.
l. Add the first CH1 to CH2 skew measurement to the second CH1 to CH2
skew measurement and divide the result by 2. Use Table 1–5.
m. Add the first CH1 to CH3 skew measurement to the second CH1 to CH3
skew measurement and divide the result by 2. Use Table 1–5.
n. Add the first CH1 to CH4 skew measurement to the second CH1 to CH4
skew measurement and divide the result by 2. Use Table 1–5.
o. Check against limits: CHECK that the largest of the three results from
steps l, m, and n is between –100 ps and + 100 ps for the TDS 684A or
between –50 ps and + 50 ps for the TDS 744A/784A.
p. Enter time on the test record.
T able 1–5: Delay Between Channels Worksheet
Add First and
Coupling
CH1 to CH2
skew
CH1 to CH3
skew
CH1 to CH4
skew
First
Measurement
Second
Measurement
Second
Measurements
Divide Sum
by 2
3. Disconnect the hookup: Disconnect the cable from the generator output at
the input connectors of the channels.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–41
Performance Tests
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
Specifications.
Check Accuracy for
Long-Term Sample Rate,
Delay Time, and Delta
Time Measurements
Equipment
Required
Prerequisites See page 1–15
Time Mark
Generator
One time-mark generator (Item 13)
One 50 , precision coaxial cable (Item 5)
Digitizing Oscilloscope
Output
50 Coaxial Cable
Figure 1–11: Initial Test Hookup
1. Install the test hookup and preset the instrument controls:
a. Hook up the test-signal source: Connect, through a 50 W precision
coaxial cable, the time-mark output of a time-mark generator to CH 1.
Set the output of the generator for 10 ms markers.
1–42
b. Initialize the oscilloscope:
H Press save/recall SETUP. Press the main-menu button Recall
Factory Setup. Press the side-menu button OK Confirm Factory
Init.
c. Modify the initialized front-panel control settings:
H Set the vertical SCALE to 500 mV.
H Press VERTICAL MENU; then press the main-menu button
Coupling. Press the side-menu button to toggle it to the 50
setting.
H Press SET LEVEL TO 50%.
H Use the vertical POSITION knob to center the test signal on screen.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
H Set the horizontal SCALE of the Main time base to 1 ms.
H Press TRIGGER MENU; then press the main-menu button Mode
& Holdoff. Press the side-menu button Normal.
2. Confirm Main and Delayed time bases are within limits for accuracies:
a. Display the test signal:
H Align the trigger T to the center vertical graticule line by adjusting
the horizontal POSITION. See Figure 1–12 on page 1–44.
H Press HORIZONTAL MENU.
H Set horizontal modes. To do this, press the main-menu button Time
Base. Press the side-menu buttons Delayed Only and Delayed Runs
After Main. See Figure 1–12.
b. Measure the test signal:
H Set the horizontal SCALE of the D (delayed) time base to 500 ns for
the TDS 684A or to 100 ns for the TDS 7XXA.
H Set delayed time to 10 ms. Do this on the keypad by pressing 10,
then SHIFT, then m followed by ENTER.)
c. Check long-term sample rate and delay time accuracies against limits:
H CHECK that the rising edge of the marker crosses the center
horizontal graticule line at a point within either ±2.0, for the TDS
684A, or ±2.5, for the TDS 7XXA, divisions of center graticule. See
Figure 1–12.
H Enter number of divisions on test record.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–43
Performance Tests
Align the trigger T to the
center graticule line.
1
4
Check long–term sample
rates and delay time
accuracies against limits.
Set horizontal scale
3
and delayed time.
Figure 1–12: Measurement of Accuracy — Long-T erm and Delay Time
Set
horizontal
2
mode.
Trigger System Checks
Check Accuracy (Time) for
Pulse-Glitch or
Pulse-Width Triggering
3. Disconnect the hookup: Disconnect the cable from the generator output at
the input connector of CH 1.
These procedures check those characteristics that relate to the Main and Delayed
trigger systems and are listed as checked in Specifications.
Equipment
Required
Prerequisites See page 1–15
One medium-frequency leveled sine wave generator (Item 1 1)
One 10X attenuator (Item 1)
One 50 , precision coaxial cable (Item 5)
1–44
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1. Install the test hookup and preset the instrument controls:
a. Initialize the instrument:
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 Press VERTICAL MENU.
H Press the main-menu button Coupling; then press the side-menu
button to select 50 coupling.
H Set the horizontal SCALE to 10 ns on the TDS 684A and 12.5 ns on
the TDS 7XXA.
c. Hook up the test-signal source: Connect the output of a
medium-frequency leveled sine wave generator (Item 11) to CH 1. Do
this through a 50 W precision coaxial cable, followed by a 10X
attenuator. See Figure 1–13.
Performance Tests
Medium-Frequency
Sine Wave Generator
Output
10X Attenuator
50 Coaxial Cable
Digitizing Oscilloscope
Figure 1–13: Initial T est Hookup
2. Confirm the trigger system is within time-accuracy limits for pulse-glitch or
pulse-width triggering (Horizontal Scale ≤1 s):
a. Display the test signal: Set the output of the sine wave generator for a
100 MHz, five-division sine wave on screen. Press SET LEVEL TO
50%.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–45
Performance Tests
b. Set the trigger mode: Press TRIGGER MENU. Now press the
main-menu button Mode & Holdoff; then press the side-menu button
Normal.
c. Set upper and lower limits that ensure triggering: See Figure 1–14.
H Press the main-menu button Type; then repeatedly press the same
button until Pulse is highlighted in the menu that pops up.
H Press the main-menu button Class; then repeatedly press the same
button until Width is highlighted in the menu that pops up.
H Press the main-menu button Trig When; then press the side-menu
button Within Limits.
H Press the side-menu button Upper Limit. Use the keyboard to set
the upper limit to 10 ns: press 10, then SHIFT, then n, and ENTER.
H Press the side-menu button Lower Limit. Use the keypad to set the
lower limit to 2 ns.
d. Change limits until triggering stops:
H Press SET LEVEL TO 50%.
H While doing the following subparts, monitor the display (it will stop
acquiring) and the front-panel light TRIG (it will extinguish) to
determine when triggering is lost.
H Use the general purpose knob to increase the Lower Limit readout
until triggering is lost.
H CHECK that the Lower Limit readout, after the oscilloscope loses
triggering, is within 2.5 ns to 7.5 ns, inclusive, for the TDS 684A or
is within 3.5 ns to 6.5 ns, inclusive, for the TDS 7XXA.
H Enter time on test record.
H Use the keypad to return the Lower Limit to 2 ns and reestablish
triggering.
H Press the side-menu button Upper Limit; then use the general
purpose knob to slowly decrease the Upper Limit readout until
triggering is lost.
H CHECK that the Upper Limit readout, after the oscilloscope loses
triggering, is within 2.5 ns to 7.5 ns, inclusive, for the TDS 684A or
is within 2.5 ns to 6.5 ns, inclusive, for the TDS 7XXA.
1–46
H Enter time on test record.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
Set upper
and lower
limits that
ensure
triggering.
Then change
limits until
triggering
stops.
Figure 1–14: Measurement of Time Accuracy for Pulse and Glitch T riggering
3. Confirm the trigger system is within time-accuracy limits for pulse-glitch or
pulse-width triggering (horizontal scale >1 s):
a. Set upper and lower limits that ensure triggering at 250 kHz:
H Press the side-menu button Upper Limit. Use the keyboard to set
the upper limit to 4 s.
H Press the side-menu button Lower Limit. Use the keypad to set the
lower limit to 500 ns.
b. Display the test signal:
H Set the horizontal SCALE to 5 s.
H Set the output of the sine wave generator for a 250 kHz,
five-division sine wave on screen. Set the vertical SCALE to 20 mV
(the waveform will overdrive the display).
H Press SET LEVEL TO 50%.
c. Check against limits: Do the following subparts in the order listed.
H Use the general purpose knob to increase Lower Limit readout until
triggering is lost.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–47
Performance Tests
H CHECK that the Lower Limit readout, after the oscilloscope stops
triggering, is within 1 s to 3 s, inclusive, for the TDS 684A or is
within 1.9 s to 2.1 s, inclusive, for the TDS 7XXA.
H Enter time on test record.
H Use the keypad to return the Lower Limit to 500 ns and reestablish
triggering.
H Press the side-menu button Upper Limit; then use the general
purpose knob to slowly decrease the Upper Limit readout until
triggering stops.
H CHECK that the Upper Limit readout, after the oscilloscope loses
triggering, is within 1 s to 3 s, inclusive, for the TDS 684A or is
within 1.9 s to 2.1 s, inclusive, for the TDS 7XXA.
H Enter time on test record.
4. Disconnect the hookup: Disconnect the cable from the generator output at
the input connector of CH 1.
Check Accuracy,
Trigger-Level or
Threshold, DC Coupled
Dual Banana to
BNC Adapters
Equipment
Required
Prerequisites See page 1–15.
DC Calibrator
One DC calibration generator (Item 9)
One BNC T connector (Item 7)
Two 50 W, precision coaxial cables (Item 5)
Digitizing Oscilloscope
50 W Coaxial Cables
BNC T
Connector
Figure 1–15: Initial T est Hookup
1. Install the test hookup and preset the instrument controls:
1–48
a. Hook up the test-signal source:
H Set the output of the DC calibration generator to 0 volts.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
H Connect the output of the DC calibration generator, through a
dual-banana connector followed by a 50 W 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 W precision coaxial cable,
to other side of the BNC T connector. Now connect the BNC T
connector to CH 1.
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. Confirm Main trigger system is within limits for Trigger-level/Threshold
accuracy:
a. Display the test signal:
H Set the vertical SCALE to 200 mV.
H Press VERTICAL MENU, then press the main-menu button
Position.
H Set vertical position to –3 divisions (press –3, then ENTER, on the
keypad.) The baseline level will move down three divisions. See
Figure 1–16 on page 1–50.
H Press the main-menu button Offset.
H Set vertical offset to +10 volts with the keypad. The baseline level
will move off screen.
H Set the standard output of the DC calibration generator equal to the
offset (+10 volts). The DC test level will appear on screen. See
Figure 1–16.
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 main menu, not the trigger readout in the graticule area.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–49
Performance Tests
c. Read results (Check against limits): See Figure 1–16.
H CHECK that the Level readout in the main menu is within 9.863 V
to 10.137 V, inclusive, for the TDS 684A or is within 9.9393 V to
10.1147 V, inclusive, for the TDS 7XXA.
H Enter voltage on test record.
H Press the main-menu button Slope; then press the side-menu button
for negative slope. See icon at left. Repeat substep b.
H CHECK that the Level readout in the main menu is within 9.863 V
to 10.137 V, inclusive, for the TDS 684A or is within 9.9393 V to
10.1147 V, inclusive, for the TDS 7XXA.
H Enter voltage on test record.
Set vertical position to –3 divs.
Set vertical offset to +10 volts.
1–50
1
2
Set DC calibration generator
to equal offset (+10 V).
3
Read results.
Figure 1–16: Measurement of Trigger-Level Accuracy
3. Confirm Delayed trigger system is within limits for Trigger-level/Threshold
accuracy:
a. Select the Delayed time base:
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
H Press HORIZONTAL MENU.
H Press the main-menu button Time Base.
H Press the side-menu buttons Delayed Only and Delayed Trigger-
able.
H Set D (delayed) horizontal SCALE to 500 s.
b. Select the Delayed trigger system:
H Press SHIFT; then press the front-panel DELAYED TRIG button.
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 (or main) menu below the label
Level.
d. Check against limits: Do the following subparts in the order listed.
H CHECK that the Level readout in the side menu is within 9.863 V to
10.137 V, inclusive, for the TDS 684A or is within 9.9393 V to
10.1147 V, inclusive, for the TDS 7XXA.
H Enter voltage on test record.
H Press the main-menu button Slope; then press the side-menu button
for negative slope. See icon at left. Press the main-menu button
Level. Repeat substep c.
H CHECK that the Level readout in the side menu is within 9.863 V to
10.137 V, inclusive, for the TDS 684A or is within 9.9393 V to
10.1147 V, inclusive, for the TDS 7XXA.
H Enter voltage on test record.
4. Disconnect the hookup:
a. First set the output of the DC calibration generator to 0 volts.
b. Disconnect the cable from the generator output at the input connector of
CH 1.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–51
Performance Tests
Sensitivity, Edge Trigger,
DC Coupled
Equipment
Required
Prerequisites See page 1–15.
One medium-frequency leveled sine wave generator (Item 1 1)
One high-frequency leveled sine wave generator (Item 12)
Two precision 50 coaxial cables (Item 5)
One 10X attenuator (Item 1)
One BNC T connector (Item 7)
One 5X attenuator (Item 2)
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. Modify the initialized front-panel control settings:
H Set the horizontal SCALE for the M (main) time base to 20 ns on
the TDS 684A or 25 ns on the TDS 7XXA.
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 on
the TDS 684A or 25 ns on the TDS 7XXA; then press the side-menu
button Main Only.
H Press TRIGGER MENU; then press the main-menu button Mode
& Holdoff. Press the side-menu button Normal.
H Press VERTICAL MENU; then press the main-menu button
Coupling. Press the side-menu button to select the 50 W setting.
H Press SHIFT; then press ACQUIRE MENU. Press the main-menu
button Mode; then press the side-menu button Average 16.
c. Hook up the test-signal source:
H Connect the signal output of a medium-frequency sine wave
generator to a BNC T connector. Connect one output of the T
connector to CH 1 through a 50 W precision coaxial cable. Connect
1–52
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
the other output of the T connector to the AUX TRIG INPUT
rear panel. See Figure 1–17.
Medium
Frequency Sine
Wave Generator
To AUX TRIG INPUT
on Rear Panel
Digitizing Oscilloscope
Figure 1–17: Initial T est 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.
at the
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 Measrmnt for Ch1.
H Press the side-menu button –more– until Amplitude appears in the
side menu (its icon is shown at the left). Press the side-menu button
Amplitude.
H Press SET LEVEL TO 50%.
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 W precision coaxial cable at CH 1 and reconnect
it to CH 1 through a 10X attenuator.
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
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–53
Performance Tests
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 will remain constantly lighted. It
will flash for slower settings.
H Press TRIGGER MENU; then press the main-menu button Slope.
H Press SET LEVEL TO 50%. Adjust the TRIGGER LEVEL knob
so that the TRIG’D light is on. Set the level to near the middle of
the range where the TRIG’D light is on. CHECK that the trigger is
stable for the test waveform on both the positive and negative slopes.
Use the side menu to switch between trigger slopes.
H Enter pass/fail result for main trigger on the test record.
H Leave the Main trigger system triggered on the positive slope of the
waveform before continuing to the next step.
1–54
Check if stable trigger.
Figure 1–18: Measurement of Trigger Sensitivity — 50 MHz Results Shown on a TDS
684A Screen
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
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. Press the side-menu button Delayed Only; then press
Delayed Triggerable in the same menu.
H Press SHIFT; then press DELAYED TRIG. Press the main-menu
button Level.
H Press the side-menu button SET 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
TRIGGER LEVEL knob to stabilize the Main trigger. Use the
general purpose knob to stabilize the Delayed trigger. Press the
main-menu button Slope; then use the side menu to switch between
trigger slopes. See Figure 1–18.
H Enter pass/fail result for delayed trigger on the test record.
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. Press the side-menu button Main
Only.
H Press CLEAR MENU.
3. Confirm the AUX Trigger input:
a. Display the test signal:
H Remove the 10X attenuator and reconnect the cable to CH 1.
H Set the test signal amplitude for about 2.5 divisions on screen.
H Now fine adjust the generator output until the CH 1 Amplitude
readout indicates the amplitude is 250 mV. (Readout may fluctuate
around 250 mV.)
b. Check the AUX trigger source for stable triggering at limits: Do the
following in the order listed.
H Use the definition for stable trigger from step 2.
H Press TRIGGER MENU; then press the main-menu button Source.
H Press the side-menu button –more– until the side-menu label
DC Aux appears; then press DC Aux.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–55
Performance Tests
H Press SET LEVEL TO 50%. CHECK that a stable trigger is
obtained for the test waveform on both the positive and negative
slopes. Press the main-menu button Slope; then use the side menu to
switch between trigger slopes. Use the TRIGGER LEVEL knob to
stabilize the trigger if required.
H Enter the pass/fail result on the test record.
H Leave the Main trigger system triggered on the positive slope of the
waveform before proceeding to the next check.
H Press the main-menu button Source; then press the side-menu button
–more– until CH 1 appears. Press CH 1.
4. Confirm that the Main and Delayed trigger systems are within sensitivity
limits (full bandwidth, for TDS 684A & TDS 784A = 1 GHz, for TDS 744A
= 500 MHz):
a. Hook up the test-signal source: Disconnect the hookup installed in
step 1. Connect, through its leveling head, the signal output of a
high-frequency leveled sine wave generator to CH 1.
b. Set the Main and Delayed Horizontal Scales:
H Set the horizontal SCALE to 500 ps for the M (Main) time base.
H Press HORIZONTAL MENU. Now press the main-menu button
Time base; then press the side-menu button Delayed Triggerable.
H Press the side-menu button Delayed Only.
H Set the horizontal SCALE to 500 ps for the D (Delayed) time base.
Press the side-menu button Main Only.
c. Display the test signal:
H Set the generator frequency to full bandwidth
(for TDS 684A & TDS 784A = 1 GHz, for 744A = 500 MHz).
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 leveling head at CH 1 and reconnect it to CH 1
through a 5X attenuator.
d. Repeat step 2, substeps b and c only, since only the full bandwidth (for
TDS 684A & TDS 784A = 1 GHz, for 744A = 500 MHz) is to be
checked here.
1–56
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Output Signal Checks
Performance Tests
NOTE. You just checked the trigger sensitivity. If desired, you may repeat steps 1
through 4 for the other channels (CH2, CH3, and CH4).
5. Disconnect the hookup: Disconnect the cable from the channel last tested.
The procedure that follows checks those characteristics of the output signals that
are listed as checked under Warranted Characteristics in Specifications. The
oscilloscope outputs these signals at its front and rear panels.
Check Outputs — CH 3
Main and Delayed Trigger
Equipment
Required
Prerequisites See page 1–15. Also, the Digitizing Oscilloscope must have passed
Two 50 precision cables (Item 5)
One calibration generator (Item 10)
Check DC Voltage Measurement Accuracy on page 1–29.
1. Install the test hookup and preset the instrument controls:
Calibration
Generator
To MAIN
TRIGGER
OUT
Digitizing Oscilloscope
50 Coaxial Cables
Figure 1–19: Initial T est Hookup
a. Hook up test-signal source 1:
H Connect the standard amplitude output of a calibration generator
through a 50 W precision coaxial cable to CH 3.
H Set the output of the calibration generator to 0.500 V.
b. Hook up test-signal source 2: Connect the Main Trigger Out at the rear
panel to CH 2 through a 50 W precision cable.
c. Initialize the oscilloscope:
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–57
Performance Tests
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 the initialized front-panel control settings:
H Set the horizontal SCALE to 200 ms.
H Press SHIFT; then press ACQUIRE MENU.
H Press the main-menu button Mode; then press the side-menu button
Average.
H Select 64 averages.
2. Confirm Main and Delayed Trigger outputs are within limits for logic levels:
a. Display the test signal:
H Press WAVEFORM OFF to turn off CH 1.
H Press CH 2 to display that channel.
H Set the vertical SCALE to 1 V.
H Use the vertical POSITION knob to center the display on screen.
b. Measure logic levels:
H Press MEASURE; then press the main-menu button Select
Measurement for Ch2.
H Select high and low measurements. To do this, repeatedly press the
side-menu button –more– until High and Low appear in the side
menu (their icons are shown at the left). Press both side-menu
buttons High and Low.
c. Check Main Trigger output against limits:
H CHECK that the Ch2 High readout is ≥2.5 volts and that the Ch2
Low readout is ≤0.7 volts. See Figure 1–20.
H Enter high and low voltages on test record.
H Press VERTICAL MENU; then press the main-menu button
Coupling. Now press the side-menu button to toggle it to the
50 W setting.
1–58
H CHECK that the Ch2 High readout is ≥1.0 volt and that the Ch2
Low readout ≤0.25 volts.
H Enter high and low voltages on test record.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Check output
Performance Tests
Figure 1–20: Measurement of Main Trigger Out Limits
d. Check Delayed Trigger output against limits: See Figure 1–20.
H Move the precision 50 W cable from the rear-panel Main Trigger
Output BNC to the rear-panel Delayed Trigger Output BNC.
H CHECK that the Ch2 High readout is ≥1.0 volt and that the Ch2
Low readout ≤0.25 volts.
H Enter high and low voltages on test record.
H Press the side-menu button to select the 1 MW setting.
H Press CLEAR MENU.
H CHECK that the Ch2 High readout is ≥2.5 volts and that the Ch2
Low readout is ≤0.7 volts.
H Enter high and low voltages on test record.
3. Confirm CH 3 output is within limits for gain:
a. Measure gain:
H Move the precision 50 W cable from the rear-panel DELAYED
TRIGGER OUTPUT BNC to the rear-panel SIGNAL OUT BNC.
H Push TRIGGER MENU.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–59
Performance Tests
H Press the main-menu button Source.
H Press the side-menu button Ch3.
H Set vertical SCALE to 100 mV.
H Press SET LEVEL TO 50%.
H Press MEASURE; then press the main-menu button Select
Measrmnt for Ch2.
H Repeatedly press the side-menu button –more– until 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.
b. Check against limits:
H CHECK that the readout Ch2 Pk-Pk is between 80 mV and 120 mV,
inclusive, for the TDS 684A or is between 88 mV and 132 mV,
inclusive, for the TDS 7XXA.
Check Probe
Compensator Output
H Enter voltage on test record.
H Press VERTICAL MENU; then press the side-menu button to
toggle to the 50 W setting.
H Press CLEAR MENU.
H CHECK that the readout Ch2 Pk-Pk is between 40 mV and 60 mV,
inclusive, for the TDS 684A or is between 44 mV and 66 mV,
inclusive, for the TDS 7XXA.
H Enter voltage on test record.
4. Disconnect the hookup: Disconnect the cables from the channel inputs and
the rear panel outputs.
Equipment
Required
Prerequisites See page 1–15. Also, the Digitizing Oscilloscope must have passed
One female BNC to clip adapter (Item 3)
Two dual-banana connectors (Item 6)
One BNC T connector (Item 7)
Two 50 precision cables (Item 5)
One DC calibration generator (Item 9)
Check Accuracy For Long-T erm Sample Rate, Delay Time, and Delta
Time Measurements on page 1–42.
1–60
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1. Install the test hookup and preset the instrument controls:
a. Hook up test-signal:
H Connect one of the 50 W cables to CH 1. See Figure 1–21.
H Connect the other end of the cable just installed to the female
BNC-to-clips adapter. See Figure 1–21.
H Connect the red clip on the adapter just installed to the PROBE
COMPENSATION SIGNAL on the front panel; connect the black
clip to PROBE COMPENSATION GND. See Figure 1–21.
Digitizing Oscilloscope
Black Lead
to GND
Performance Tests
Female BNC to
Clip Adapter
50 Coaxial Cable
Figure 1–21: Initial T est 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 Set the horizontal SCALE to 200 ms.
H Press SET LEVEL TO 50%.
H Use the vertical POSITION knob to center the display on screen.
H Press SHIFT; then press ACQUIRE MENU.
H Press the main-menu button Mode; then press the side-menu button
Average.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–61
Performance Tests
H Select 128 averages.
2. Confirm that the Probe Compensator signal is within limits for frequency:
a. Measure the frequency of the probe compensation signal:
H Press MEASURE; then press the main-menu button Select
Measrmnt for Ch1.
H Repeatedly press the side-menu button –more– until Frequency
appears in the side menu (its icon is shown at the left). Press the
side-menu button Frequency.
b. Check against limits:
H CHECK that the CH 1 Freq readout is within 950 Hz to 1.050 kHz,
inclusive. See Figure 1–22.
H Enter frequency on test record.
H Press MEASURE; then press the main-menu button Remove
Measrmnt for Ch1. Press the side–menu Measurement 1.
1–62
Figure 1–22: Measurement of Probe Compensator Frequency
c. Save the probe compensation signal in reference memory:
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
H Press SAVE/RECALL WAVEFORM; then press the main-menu
button Save Wfm Ch 1.
H Press the side-menu button To Ref 1 to save the probe compensation
signal in reference 1.
H Disconnect the cable from CH 1 and the clips from the probe
compensation terminals.
H Press MORE; then press the main-menu button Ref 1 to displayed
the stored signal.
H Press CH 1.
d. Hook up the DC standard 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 W precision coaxial cable to
one side of a BNC T connector. See Figure 1–23.
H Connect the Sense output of the generator through a second
dual-banana connector followed by a 50 W precision coaxial cable to
the other side of the BNC T connector. Now connect the BNC T
connector to CH 1. See Figure 1–23.
DC Calibrator
Dual Banana to
BNC Adapters
50 Coaxial Cables
Figure 1–23: Subsequent T est Hookup
e. Measure amplitude of the probe compensation signal:
H Press SHIFT; then press ACQUIRE MENU. Press the side-menu
button AVERAGE then enter 16 using the keypad or the general
purpose knob.
Digitizing Oscilloscope
BNC T
Connector
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–63
Performance Tests
H Adjust the output of the DC calibration generator until it precisely
overlaps the top (upper) level of the stored probe compensation
signal. (This value will be near 500 mV.)
H Record the setting of the DC generator.
H Adjust the output of the DC calibration generator until it precisely
overlaps the base (lower) level of the stored probe compensation
signal. (This value will be near zero volts.)
H Record the setting of the DC generator.
f. Press CLEAR MENU to remove the menus from the display. See
Figure 1–24.
1–64
Figure 1–24: Measurement of Probe Compensator Amplitude
g. Check against limits:
H Subtract the value just obtained (base level) from that obtained
previously (top level).
H CHECK that the difference obtained is within 495 mV to 505 mV,
inclusive.
H Enter voltage difference on test record.
3. Disconnect the hookup: Disconnect the cable from CH 1.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Option 05 Video Trigger Checks
Performance Tests
Check Video Trigger
Equipment
Required
Prerequisites See page 1–15. These prerequisites include running the signal path
PAL signal source (Item 16)
60 Hz. sine wave generator (Item 17)
Pulse generator (Item 18)
Two 75 cables (Item 19)
Two 75 terminators (Item 20)
One BNC T connector (Item 7)
50 cable (Item 5)
50 terminator (Item 4)
compensation routine.
1. Set up digitizing oscilloscope to factory defaults by completing the following
steps:
a. Press save/recall SETUP.
b. Press the main-menu Recall Factory Setup.
c. Press the side-menu OK Confirm Factory Init.
d. Wait for the Clock Icon to leave the screen.
e. CONFIRM the digitizing oscilloscope is setup as shown below.
Channel: CH1
Volt/div: 100 mV
Horizontal scale: 500 s/div
2. Set up digitizing oscilloscope for TV triggers by completing the following
steps:
a. Press TRIGGER MENU.
b. Press the main-menu Type pop-up until you select Video.
c. Press the main-menu Standard pop-up until you select 625/PAL.
d. Press the main-menu Line.
e. Use the keypad to set the line number to 7 (press 7, then ENTER).
f. Press VERTICAL MENU.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
1–65
Performance Tests
g. Press the main-menu Bandwidth.
h. Select 250 MHz from the side menu.
i. Press the main-menu Fine Scale.
j. Use the keypad to set the fine scale to 282mV (press 282, SHIFT, m,
then ENTER).
k. Press HORIZONTAL MENU.
l. Press the main-menu Horiz Scale.
m. Use the keypad to set the horizontal scale to 200 ns (press 200, SHIFT,
n, then ENTER).
3. Check Jitter vs. Signal Amplitude
a. Set up equipment for Jitter Test. See Figure 1–25.
H Connect one of the rear panel composite outputs marked COMPST
on the TSG121 through a 75 W cable and a 75 W terminator to the
CH1 input of the TDS.
H Press the 100% FIELD control (the fourth TSG121 front-panel
button from the left) of the PAL signal source.
PAL Signal
Source
COMPST
75 Cable
Digitizing Oscilloscope
75
Terminator
Figure 1–25: Jitter T est Hookup
b. CHECK that the oscilloscope lights up its front panel TRIG’D LED and
it displays the waveform on screen. See Figure 1–26.
1–66
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
Figure 1–26: Jitter T est Displayed Waveform – TDS 684A Shown
c. Press SHIFT; then press ACQUIRE MENU.
d. Press the main-menu Mode.
e. Select the side-menu Average. It should be already set to 16.
f. Press the main-menu Create Limit Test Template.
g. Press the side-menu V Limit.
h. Use the keypad to set V Limit to 180 mdiv (press 180, SHIFT, m, then
ENTER)
i. Press the side-menu OK Store Template.
j. Press MORE.
k. Press the main-menu Ref1.
l. Press CH1.
m. Press SHIFT; then press ACQUIRE MENU.
n. Press the main-menu Limit Test Setup.
o. Toggle the side-menu Limit Test to ON.
p. Toggle the side-menu Ring Bell if Condition Met to ON.
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Performance Tests
q. Press the main-menu Mode.
r. Press the side-menu Envelope.
s. Use the keypad to set envelope to use 100 acquisitions (press 100, then
ENTER).
t. Press the main-menu Stop After button.
u. Press the side-menu Single Acquisition Sequence.
v. Confirm that the oscilloscope successfully makes 100 acquisitions. If not
successful, the oscilloscope bell will ring. When the word Run in the top
left corner of the display changes to STOP, the test is complete. See
Figure 1–27.
Stop shows test complete
Figure 1–27: Jitter Test When Completed – TDS 684A Shown
w. Press the main-menu Limit Test Setup.
x. Toggle the side-menu Ring Bell if Condition Met to OFF.
y. Toggle the side-menu Limit Test to OFF.
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4. Check Triggered Signal Range.
Set up oscilloscope for Triggered Signal Test.
a. Press MORE.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
b. Press WAVEFORM OFF.
c. Press HORIZONTAL MENU.
d. Use the keypad to set horizontal scale (/div) to 50 s (press 50, SHIFT,
m, then ENTER).
e. Press SHIFT; then press ACQUIRE MENU.
f. Press the main-menu Stop After.
g. Press the side-menu RUN/STOP button only.
h. Press the main-menu Mode.
i. Press the side-menu Sample.
j. Press RUN/STOP.
k. Press VERTICAL MENU.
l. Use the keypad to set fine scale to 300 mV (press 300, SHIFT, m, then
ENTER).
m. CONFIRM that the TRIG’D LED stays lighted and that the waveform
on screen is stable. That is, it does not move horizontally or vertically.
Also, CONFIRM that the waveform on the screen has one positive pulse
and a number of negative pulses. See Figure 1–28.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
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Performance Tests
Positive pulse
Negative pulses
Figure 1–28: Triggered Signal Range Test – 300 mV
n. Use the keypad to set the fine scale to 75 mV (press 75, SHIFT, m, then
ENTER).
o. CONFIRM that the TRIG’D LED stays lighted and that the waveform
on screen is stable. That is, it does not move horizontally or vertically.
Also, CONFIRM that the waveform on the screen has one positive pulse
and a number of negative pulses. See Figure 1–29.
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TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Positive pulse
Negative pulses
Performance Tests
Figure 1–29: Triggered Signal Range Test – 75 mV
p. Disconnect all test equipment (TSG121) from the digitizing oscillo-
scope.
5. Check 60 Hz Rejection.
a. Set up oscilloscope for 60 Hz Rejection Test.
H Use the keypad to set the Ch1 Fine Scale to 282 mV (press 282,
SHIFT m, then ENTER).
H Press WAVEFORM OFF.
H Press CH2.
H Press VERTICAL MENU.
H Use the keypad set the fine scale to 2 V (press 2, then ENTER).
H Press HORIZONTAL MENU.
H Use the keypad to set the horizontal scale (/div) to 5 ms (press 5,
SHIFT, m, then ENTER).
b. Set up 60 Hz signal generator (SG 502).
H Connect the output of the SG 502 to the CH2 input through a 50 W
cable. See Figure 1–30.
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Performance Tests
Digitizing Oscilloscope
Signal Generator
Output
50 Cable
Figure 1–30: 60 Hz Rejection Test Hookup
H Adjust the SG 502 for three vertical divisions of 60 Hz signal. See
Figure 1–31. The signal will not be triggered. That is, it will run
free.
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Figure 1–31: 60 Hz Rejection Test Setup Signal
c. Check 60 Hz rejection.
H Use the keypad to set the horizontal scale (/div) to 50 s (press 50,
SHIFT, m, then ENTER).
H Reconnect the output of the signal generator (SG 502). Connect the
composite signal connector of the PAL signal source (labeled
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
COMPST on the TSG 121) to a 75 W cable and a 75 W terminator.
Connect both signals to the CH1 input through a BNC T. See
Figure 1–32.
H Press VERTICAL MENU.
H If needed, press the main-menu Fine Scale.
H Use the keypad to set fine scale to 500 mV (press 500, SHIFT, m,
then ENTER).
H Connect another composite signal connector of the PAL signal
source (labeled COMPST on the TSG 121) through a 75 W cable
and a 75 W terminator to the CH2 input. See Figure 1–32.
PAL Signal
Source
Signal Generator
COMPST
75 Cable
Output
COMPST
50 Cable
75 Cable
Figure 1–32: Subsequent 60 Hz Rejection T est Hookup
H CONFIRM that the TRIG’D LED stays lighted and that the
waveform on screen is stable. In other words, be sure the waveform
does not move horizontally or vertically. Also, confirm that the
waveform on the screen has one positive pulse and a number of
negative pulses. See Figure 1–33.
Digitizing Oscilloscope
BNC T
Connector
75
Terminators
H Disconnect all test equipment from the digitizing oscilloscope.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
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Performance Tests
Figure 1–33: 60 Hz Rejection Test Result – TDS 684A Shown
6. Check Line Count Accuracy.
a. Set up oscilloscope for Line Count Accuracy Test.
H Press WAVEFORM OFF.
H Press CH1.
H Press HORIZONTAL MENU.
H Press the main-menu Record Length.
H Press the side-menu –more– until you see the appropriate menu.
H Press the side-menu 5000 points in 100divs.
H Press the main-menu Horiz Scale (/div).
H Use the keypad to set the horizontal scale to 200 ns (press 200,
SHIFT, n, then ENTER).
b. Check Line Count Accuracy.
H Connect a composite output signal from the rear of the PAL signal
source (labeled COMPST on the TSG 121) to the CH1 input
through a 75 W cable and a 75 W terminator. See Figure 1–34.
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TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
PAL Signal
Source
Output
75 Cable
Digitizing Oscilloscope
Figure 1–34: Line Count Accuracy T est Hookup
H Press the main-menu Trigger Position.
H Press the side-menu to Set to 50%.
Performance Tests
75
Terminator
H Press the main-menu to Horiz Pos.
H Press the side-menu to Set to 50%.
H Use the HORIZONTAL POSITION knob to move the falling edge
of the sync pulse to two divisions to the left of center screen. See
Figure 1–35.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
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Performance Tests
Figure 1–35: Line Count Accuracy Test Setup Waveform – TDS 684A Shown
H Press CURSOR.
H Press the main-menu Function.
H Press the side-menu V Bars.
H Using the General Purpose knob, place the left cursor directly over
the trigger ‘T’ icon.
H Press SELECT.
H Turn the General Purpose knob to adjust the right cursor for a cursor
delta reading of 6.780us.
H Use the HORIZONTAL POSITION knob to position the right
cursor to center screen.
H Verify that the cursor is positioned on a positive slope of the burst
signal. See Figure 1–36.
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TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
Figure 1–36: Line Count Accuracy Correct Result Waveform
H Disconnect all test equipment (TSG 121) from the digitizing
oscilloscope.
H Turn off cursors by pressing CURSOR, then the main-menu
Function button, and, finally, Off from the side menu.
7. Check the Sync Duty Cycle.
a. Set up digitizing oscilloscope for Sync Duty Cycle Test.
H Press TRIGGER MENU.
H Press the Standard pop-up to select FlexFmt. Trigger Type should
already be set to Video.
H Press the main-menu Setup.
H Press the side-menu Field Rate.
H Use the keypad to set the field rate to 60.05 Hz (press 60.05, then
ENTER).
H Press the side-menu Lines.
H Use the keypad to set the field rate to 793 lines (press 793, then
ENTER).
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Performance Tests
H Press the side-menu Fields.
H Use the keypad to set the number of fields to 1 (press 1, then
ENTER).
H Press the side-menu Sync Width.
H Use the keypad to set the width to 400 ns (press 400, SHIFT, n,
then ENTER).
H Press the side-menu –more– 1 of 2. Then press V1 Start Time.
H Use the keypad to set V1 start time to 10.10 s (press 10.10, SHIFT,
m, then ENTER).
H Press the side-menu V1 Stop Time.
H Use the keypad to set V1 stop time to 10.50 s (press 10.50, SHIFT,
m, then ENTER).
H Press the main-menu Type pop-up to select Edge.
H Press HORIZONTAL MENU.
H Press the main-menu Record Length.
H Select the side-menu 1000 points in 20div. If needed, first press the
side-menu –more– until you see the appropriate side-menu item.
H Turn the HORIZONTAL POSITION knob to position the trigger
‘T’ two divisions to the left of the center screen.
H Press MEASURE.
H If needed, press the main-menu Select Measrmnt.
H Press the side-menu Negative Width.
H Press the side-menu Period.
b. Set up the pulse generator (PG502) for Sync Duty Cycle Test.
H Set PULSE DURATION to 50 ns.
H Set PERIOD to 10 s.
H Set OUTPUT (VOLTS) to –1 for LOW LEVEL and +1 for HIGH
LEVEL.
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H Depress the COMPLEMENT button.
H Be sure BACK TERM is depressed (in).
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
c. Check Sync Duty Cycle.
H Connect the pulse generator (PG502) through a 50 W cable and a
50 W terminator to the oscilloscope CH1 input. See Figure 1–37.
Pulse
Generator
Output
50 Cable
Digitizing Oscilloscope
50
Terminator
Figure 1–37: PG502 Setup for Sync Duty Cycle Test
H Turn the pulse generator OUTPUT (VOLTS) control until the signal
on the oscilloscope shows a one division negative going pulse. See
Figure 1–38.
NOTE. You may need to adjust the trigger level control to obtain a stable trigger.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
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Performance Tests
Figure 1–38: Sync Duty Cycle Test: One-Div Neg Pulse Waveform
H Turn the pulse generator PULSE DURATION variable control to
adjust the negative pulse so the oscilloscope’s CH1 – Width
measurement displays 400ns +/–10 ns.
H Turn the HORIZONTAL SCALE knob to set the oscilloscope time
base to 5ms/div.
H Turn the pulse generator PERIOD variable control to adjust the
period until the oscilloscope CH1 Period measurement reads
21.000ms –25/+50 ns. See Figure 1–39. Read note shown below.
NOTE. The pulse duration and period adjustments are critical in making this
measurement. If the pulse duration and/or the duty cycle are not stable, the
FLEXFMT function may not function. You must take care when making these
adjustments.
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TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Performance Tests
Figure 1–39: Sync Duty Cycle T est: Critically Adjusted Pulse
H Press TRIGGER MENU.
H Press the main-menu Type pop-up until you select Video.
If the TRIG’D LED is not lighted, check that the CH1 – Width and
CH1 Period measurements are adjusted correctly. See note above.
CONFIRM that the setup is correct and the oscilloscope will trigger.
H CONFIRM that the TRIG’D LED is lighted and the waveform is
stable.
H Disconnect the signal source from CH1, wait a few seconds, then
reconnect the signal.
H CONFIRM that the TRIG’D LED is lighted and the waveform is
stable.
H Press Sync Polarity.
H Press Pos Sync.
H Push the pulse generator COMPLEMENT button out.
H CONFIRM that the TRIG’D LED is lighted and the waveform is
stable.
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
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Performance Tests
H Disconnect the signal source from CH1, wait a few seconds, then
reconnect the signal.
H CONFIRM that the TRIG’D LED is lighted and the waveform is
stable.
H Disconnect all test equipment (TSG 121) from the digitizing
oscilloscope.
H Press save/recall SETUP, the main-menu button Recall Factory
Setup, and the side-menu OK Confirm Factory Init.
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TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
Specifications
Specifications
Product Description
This section begins with a general description of the traits of the TDS 684A and
7XXA Digitizing Oscilloscopes. Three sections follow, one for each of three
classes of traits: nominal traits, warranted characteristics, and typical character-
istics.
The TDS 684A and 7XXA 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.
T able 2–1: Key Features of the TDS 684A and 7XXA Oscilloscopes
Feature TDS 684A TDS 7XXA
Digitizing rate, maximum 5 GS/s on each channel
simultaneously
Analog bandwidth 1 GHz TDS 744A: 500 MHz
TDS 744A: 2 GS/s
TDS 784A: 4 GS/s
TDS 784A: 1 GHz
Channels Four, each with 8-bit resolution
Record lengths, maximum 15,000 samples 50,000 samples
(500,000 with option 1M)
Acquisition modes Sample, envelope, and
average
Trigger modes Include: edge, logic, and pulse.
Video trigger , with option 05, modes include:
NTSC, SECAM, PAL, HDTV, and FlexFormat.
Display Color for distinguishing among waveforms, measurements, and
associated text
Storage 1.44 Mbyte, 3.5 inch, DOS 3.3-or-later floppy disk.
NVRAM storage for saving waveforms, hardcopies, and setups
I/O Full GPIB programmability.
Hardcopy output using GPIB, RS-232, or Centronics ports
Sample, envelope, average,
high-resolution, and
peak-detect
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
2–1
Specifications
User Interface
Use a combination of front-panel buttons, knobs, and on-screen menus to control
the many functions of the oscilloscope. The front-panel controls are grouped
according to function: vertical, horizontal, trigger, and special. Set a function you
adjust often, such as vertical positioning or the time base setting, directly by its
own front-panel knob. Set a function you change less often, such as vertical
coupling or horizontal mode, indirectly using a selected menu.
Menus
Indicators
General Purpose Knob
GUI
Pressing one (sometimes two) front-panel button(s), such as vertical menu,
displays a main menu of related functions, such as coupling and bandwidth, at
the bottom of the screen. Pressing a main-menu button, such as coupling,
displays a side menu of settings for that function, such as AC, DC, or GND
(ground) coupling, at the right side of the screen. Pressing a side-menu button
selects a setting such as DC.
On-screen readouts help you keep track of the settings for various functions,
such as vertical and horizontal scale and trigger level. Some readouts use the
cursors or the automatic parameter extraction feature (called measure) to display
the results of measurements made or the status of the instrument.
Assign the general purpose knob to adjust a selected parameter function. More
quickly change parameters by toggling the SHIFT button. Use the same method
as for selecting a function, except the final side-menu selection assigns the
general purpose knob to adjust some function, such as the position of measurement cursors on screen, or the setting for a channel fine gain.
The user interface also makes use of a GUI, or Graphical User Interface, to make
setting functions and interpreting the display more intuitive. Some menus and
status are displayed using iconic representations of function settings, such as
those shown here for full, 250 MHz and 20 MHz bandwidth. Such icons allow
you to more readily determine status or the available settings.
Signal Acquisition System
The signal acquisition system provides four, full-featured vertical channels with
calibrated vertical scale factors from 1 mV to 10 V per division. All channels can
be acquired simultaneously.
Each of the full-featured channels can be displayed, vertically positioned, and
offset, can have their bandwidth limited (250 MHz or 20 MHz) and their vertical
coupling specified. Fine gain can also be adjusted.
2–2
TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications
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