Measurements 14
Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide 211
Statistics are calculated on the most recent "N" number of values, where N is
the either the total number of acquisitions measured or a limited Max Count
number of acquisitions measured.
Other things to know about measurement statistics:
• When the [Single] key is pressed, statistics are reset and a single measurement
is done (count = 1). Successive [Single] acquisitions accumulate statistical data
(and the count is incremented).
Measurement Limit Testing
Measurement limit testing lets you test measurement values to see whether they
are inside or outside specified limits. You can display limit test results, and you can
stop running oscilloscope acquisitions when there is a failure. You can specify
whether measured values inside the limits or outside the limits are considered
failures.
To enable measurement limit testing and add measurements to the limit test,
specify limits, and specify whether failures are inside or outside the limits:
1 First, add the measurements whose limits you want to test.
In the Limit Test dialog box (opened in the next step), if measurements have not
already been added, there is a Measurements... button that opens the
Measurements dialog box where you can add, edit, and delete measurements,
specify measurement thresholds, specify the measurement window, display
measurement statistics, and display measurement histograms.
2 From the main menu, choose Measure > Limit Test....
3 In the Limit Test dialog box, select On to enable or disable limit testing.
Measurement limit results are reset whenever Measurement Limit Test is
re-enabled.
4 Active measurements whose limits can be tested appear in the Measurement
column. Select a measurement to enable or disable it in the limit test.
5 Use the drop-down list in the Fail When column to select whether values Outside
Limits or Inside Limits are considered failures.
6 Specify the measurement limits:
• To directly enter measurement limits, select the Lower Limit and Upper Limit
fields, and enter the values.
• To create measurement limits from the last measured value plus or minus a
percent margin, select the field in the Copy Margin column and enter the
percent margin. Then, select the Copy button in the Copy From Results
column.
Limit test results are displayed with measurement statistics (which are forced on).
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