4-32 ES User’s Guide
Using Instrument Functions
Using Limit Testing
To Create a Single Point Limit
Sometimes you may only be interested in the power level at one
particular frequency. In this case, you may wish to use a single point
limit. In the following example, use the setup from the previous
examples and assume that your bandpass filter’s specified insertion loss
at 174 MHz must be less than 3 dB. The following instructions create a
−3 dB single point limit at 174 MHz.
CAUTION Limit tests are only performed on actual data points,not the interpolated
values between. When setting a single point limit, the limit is actually
applied to the closest data point to the frequency of the set limit. See
“Additional Notes on Limit Testing” on page 4-39 for more information.
1. Press .
2. Press .
3. Press .
To Use Marker Limit Functions
The following marker limit test types are available in the marker limit
table:
• Statistic: Mean
• Statistic: p-p
• Flatness
• Delta Ampl
• Delta Freq
You can use pass/fail limit testing on three parameters of the marker
math functions: statistical mean, peak-to-peak ripple, and flatness. (See
“To Use Marker Statistics” on page 4-18 and “To Use Marker Flatness”
on page 4-20 for more information on these types of searches.) You can
also use specific markers to limit-test delta amplitude and delta
frequency.
All of these special marker limit functions can be used in conjunction
with regular limit line testing.
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