Limit testing (non-EDU models only)
You can use the oscilloscope to monitor an active input signal against a template
and to output pass or fail results by judging whether the input signal is within the
bounds of the template.
Use the limit test if you need a Pass/Fail test to determine if a signal is good. Set
up the oscilloscope to automatically monitor a source signals and output Pass or
Fail results by evaluating whether or not the acquired waveform falls within
predefined boundaries. The limit test feature allows you to create templates based
on one or two independent reference waveforms. If a failure is detected, a series
of specific actions can be triggered.
1. Push the front-panel Function button.
2. Select Limit Test from the resulting side menu to bring up the limit testing
menu.
3. Select Source from the side menu to define the source of the waveform to
compare against the limit test template.
4. Select Compare To to specify the limit test template against which to
compare test signals sectioned with the Source menu item.
5. Push Template Setup from the side menu to define the boundary to compare
with the input source signals.
If you pushed Template Setup, you can create the template with specific
horizontal and vertical tolerances. You can create them from channel 1,
channel 2, or the Math waveform. On page 2 of the resulting menu you can
push Display Template and toggle between On and Off to display or not a
stored template. Push Back from page 2 to return to the top level of the limit
test menu.
6. Push - more - page 1 of 2 to see the Action on Violation side-menu button.
Select it and then select an action from the resulting side menu to describe
what the oscilloscope will do after it detects a violation. You can select
between Save Waveform and Save Image. Push Back to return to the top
level of the limit test menu.
7. Push the Stop After button from page 2 of the top level of the limit test
menu. Push the button with the same name on the resulting side menu. On
the resulting pop-out menu, turn and push the Multipurpose knob to define
the conditions that will stop limit testing. If you select Waveforms,
Violations, or Time, push the resulting side menu items and turn the
Multipurpose knob to set the desired number of waveforms, number of
violations, or the time in seconds at which to stop. You can also choose
Manual to stop the testing manually.
8. Push the Run/Stop Test side-menu button from page 1 of the top level of the
limit test menu to toggle between starting and ending the limit test. After the
test ends, the oscilloscope will display the test statistics on the lower-level
corner of the screen. This includes the total number of cases tested, the
number of cases passed, and the number of cases failed.
Application examples
TBS1000B and TBS1000B-EDU Series Oscilloscopes User Manual 51
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