Reference
TDS 684A, TDS 744A & TDS 784A
Digitizing Oscilloscopes
070-8999-02
To Display a Waveform:
To Preview a Waveform (TDS 700A Models):
Attach a probe to CH 1
1234
and hook it up to your signal.
Press
CH 1 button.
Press
AUTOSET.
Adjust VERTICAL and HORIZONTAL
POSITION and SCALE as desired.
Press the ZOOM button.
1
Press Mode in the main menu. Then press Preview
in the side menu to turn on Dual Window Zoom.
2
Upper graticule zooms the boxed area
on the selected waveform.
Lower graticule displays the selected waveform
unzoomed with the zoomed area in box.
Device Under
Test
Use the Selected Graticule menu to select the upper
or lower waveform. Use the vertical and horizontal
knobs to adjust the waveform in the graticule you select.3
To Capture Infrequent Events (TDS 700A Models):
Press the InstaVu button to toggle between InstaVu
and Normal waveform capture rates.
When in InstaVu mode:
Waveforms displayed are updated thousands of
times faster than normal.
Very brief changes in waveforms are captured.
Certain features, such as Limit Testing, Math
Waveforms, Zoom, and record lengths longer than
500 points, are not available.
Copyright Tektronix, Inc., 1994. Printed in U.S.A.
To Save a Hardcopy to the File System:
Press Format in the main menu, and select a
12
Press SHIFT, and then press HARDCOPY.
Disk Drive
hardcopy format from the side menu.
To Set Up Using a Menu:
1
Press any of the front panel menu buttons.
Use SHIFT
Button for
Alternate (Blue)
Menus
Press HARDCOPY anytime to save a copy
Press Port in the main menu, press File in the
side menu, and then press CLEAR MENU.
3
of the current screen to a unique file in the
oscilloscope file system.
4
To Perform Other File System Operations:
Press SAVE/RECALL WAVEFORM, and use the menu buttons to save a waveform to a file or
recall it from a file.
Press SAVE/RECALL SETUP, and use the menu buttons to save a setup to a file or recall it
from a file.
2
Select an item from the main (bottom) menu.
3
Select an item from the side menu, if displayed.
Readout Indicates Value That
You Can Adjust with the
General Purpose Knob or
Keypad
Adjustable Menu Item Value
General Purpose
Knob
Keypad
Press File Utilities in the Save/Recall Waveform, Save/Recall Setup, or Hardcopy menus to access
utilities that create directories, copy files, and do other operations in the oscilloscope file system.
Adjust menu item values using the general purpose
4
knob or by entering numbers on the keypad.
End Your Entry by
Pressing ENTER ( )
To Select a Trigger:
Trigger Selections
TYPE
<Edge>
To Take Measurements Automatically:
CLASS
<Pattern>
1
Press TRIGGER MENU button.
This Symbol
Indicates
Pop-Up Menu
Select trigger type or
2
parameter from main menu.
Select any one of
Ch 1 thru Ch 4,
Line, or DC Aux
Positive
Negative
Level
Level Slope Source
Define levels High,
Low, or Don’t Care
for Ch 1 thru Ch 4
AND
OR
NAND
NOR
Set a threshold
level for each of
Ch 1 thru Ch 4
Set Thresholds Define Logic Define InputsTrigger When
Press Select Measrmnt or Snapshot in
12
Press MEASURE button.
main menu.
Automated Measurement Selections
Select
Measurement
Period
Frequency
Positive
Width
Rise Time
Fall Time
Positive
Duty Cycle
Delay
Phase
Burst Width
High
Low
Max
Pk–Pk
Amplitude
Positive
Overshoot
Mean
Cycle Mean
RMS
Area
Cycle Area
To
1 of 7
Set TRIGGER MAIN LEVEL.
3
“T” Shows
Trigger Position
Press to Display
Pop-Up Menus
Press Again to
Make Selection
A Pop-Up Selection
Changes the Other
Main Menu Items
Title of
Side Menu
Arrow Shows
Trigger Level
Removes
Menus From
Screen
DC
Coupling
AC
HF
Reject
LF
Reject
Noise Rej (DC
Low Sensitivity)
Goes TRUE
Goes FALSE
TRUE for
1
less than
TRUE for
more than
1
Qualification by time
1
Select up to four
3
measurements.
Press CLEAR MENU button to move
4
measurement readouts away from graticule.
Negative
Width
—more—
1 of 7
Negative
Duty Cycle
—more—
2 of 7
—more—
3 of 7
Min
—more—
4 of 7
Negative
Overshoot
—more—
5 of 7
Cycle RMS
—more—
6 of 7
To Take Measurements With Cursors:
12
Press CURSOR button. Press Function in main menu.
Measures Voltage
Measures Time
Measures Voltage at Time
Move cursor with general purpose knob.
Press SELECT to switch between cursors.
Press SHIFT to speed up/slow down
34
Select from side menu.
cursor movement.
TYPE
<Logic>
CLASS
<State>
Define levels High,
Low, or Don’t Care
for Ch 1 thru Ch 3
Select edge for the
clock (always Ch 4)
AND
OR
Define Logic Define Inputs
NAND
NOR
Set a threshold
level for each of
the pattern
channels, Ch 1
thru Ch 3, and
the clock, Ch 4.
CLASS
<Setup/Hold>
Select one of
Ch 1 thru Ch 4 as
the data source
Do not select the
Data SourceSetup/Hold Times
same channel used
as the clock source
Select one of
Ch 1 thru Ch 4 as
the clock source
Select the clock
Clock Source
edge
Do not select the
same channel used
as the data source
Clock
Levels
Data
TYPE
<Pulse>
CLASS
<Glitch>
Select any one of
Ch 1 thru Ch 4
Source
Positive
Negative
Polarity & Width
Either
Width
Level Level
CLASS
<Runt>
Select any one of
Ch 1 thru Ch 4
SourceTrigger When
Positive
Polarity
Negative
Either
Runt
Upper
Thresholds
Runt
Lower
CLASS
<Width>
Select any one of
Ch 1 thru Ch 4
Positive
Polarity Source
Negative
CLASS
<Slew Rate>
Select any one of
Ch 1 thru Ch 4
SourceTrigger When
Positive
Polarity
Negative
Either
High
Thresholds
Low
TYPE
<Video>
(Optional)
Select any one of
Ch 1 thru Ch 4
Source
Negative Sync
Positive Sync
Sync Polarity
Set video field
and line number
To Display Help On Screen:
1
Press HELP button.
Now turn any knob or press any button
and read a description of it on the display.
Press HELP button again to exit help.
2
Goes TRUE
Trigger When Set Thresholds
Goes FALSE
Set levels or select
preset levels based
on TTL or ECL logic
Select and set the
Setup Time
Select and set the
Hold Time
Glitch (Filter) Level
OFF
ON
Accept
Glitch
Reject
Glitch
Set levels or select
preset levels based
on TTL or ECL logic
Select trigger
when any runt
occurs or ...
Select triggering
when a runt wider than specified
2
occurs
2
Qualification by width
Within
Limits
Out of
Trigger When Level
Limits
Set Lower and
Upper Limits
Set levels or select
preset levels based
on TTL or ECL logic
Faster
Slower
Delta
Time
Select faster than
or slower than and
set delta time
The oscilloscope
computes the slew
rate readout from
the delta time and
thresholds settings
NTSC
Standard Field/Line
PAL
HDTV
FlexFmt
To Choose an Acquisition Mode:
How the Acquisition Modes Work:
1
Press SHIFT, and then press ACQUIRE MENU.
Incoming
Signal
Single
Waveform
Acquisition
Samples Acquired
for Each Waveform
Data Point Interval
Acquisition Mode
Processes
Samples
Sample
Uses first sample in interval
Available on TDS 700A Only
Peak Detect
Uses highest and lowest
samples in interval
Displayed
Data Point
Waveform
Drawn on CRT
Use for fastest acquisition rate.
Sample is the default mode.
Use to reveal aliasing and for
glitch detection.
Peak Detect provides the
benefits of enveloping with
speed of single acquisition.
2
Press Mode in main menu.
From side menu, select an acquisition
mode that will serve your application.
3
Multiple
Waveform
Acquisitions
Available on TDS 700A Only
Hi Res
Calculates average of
samples in interval
Envelope
Uses highest and lowest
samples over many acquisitions
Average
Calculates average value over
many acquisitions
Use to reduce apparent noise.
Hi Res provides the benefits
of averaging with the speed of
single acquisition.
Use to reveal the noise band
around the signal.
Use to reduce apparent noise
in a repetitive signal.
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