Limit Testing
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
3–65
To specify the channel that will acquire the waveforms to be compared against
the template:
1. Press SHIFT ACQUIRE MENU
➞ Limit Test Sources (main) ➞
Compare Ch1 to, Compare Ch2 to, Compare Ch3 to, or Compare Ch4
to
(side). On the TDS 510A you may also select Compare Math1 to,
Compare Math2 to, or Compare Math3 to
(side).
2. Once you select one of the channels as a waveform source from the side
menu, press the same side menu button to toggle to the reference memory in
which you stored the template.
Choosing None turns limit testing off for the specified channel.
To specify the action to take if waveform data exceeds the limits set by the limit
test template:
1. Press SHIFT ACQUIRE MENU ➞ Limit Test Setup (main) to bring up a
side menu of possible actions.
2. Ensure that the side button corresponding to the desired action reads ON:
To send a hardcopy command when waveform data exceeds the limits
set, toggle Hardcopy if Condition Met
(side) to ON. (Do not forget to
set up the hardcopy system. See Hardcopy on page 3–47 for details.)
To ring the bell when waveform data exceeds the limits set, toggle Ring
Bell if Condition Met
(side) to ON.
To stop the digitizing oscilloscope when waveform data exceeds the
limits set, toggle Stop After Limit Test Condition Met
(side) to ON.
NOTE. The button labeled Stop After Limit Test Condition Met corresponds to the
Limit Test Condition Met menu item in the Stop After main menu. You can turn
this button on in the Limit Test Setup menu, but you cannot turn it off. In order to
turn it off, press Stop After and specify one of the other choices in the Stop After
side menu.
To turn limit testing on:
3. Press Limit Test
(side) to toggle it to ON.
When making a single waveform versus a single template comparison, consider
the following operating characteristics:
The waveform is repositioned horizontally to move the first sample in the
waveform record that is outside of template limits to center screen.
To Select a Limit Test
Source
To Specify the Limit Test
Response
Single Waveform
Comparisons
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