HP HP 8712ET, User Manual, Page: 150 / 480

4-32 ET 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.
Prior Menu Add Limit Add Min Point
Frequency 174 MHz
Limit
−
3 Enter