Chapter 3 89
Making Measurements
FM Deviation Measurement
Capture Time
Requires PSA firmware revision A.11.08 or above, or Option 23A
Sets the data capture time. Manual and automatic modes are available.
Default is 250 ms.
Min 1 μs
Max 10 sec
Fast Mode
When fast mode is on, PSA samples fewer points so the capture time and
processing time is shorter. This results in faster measurements. The speed
improvement is dependent on signal rate and deviation. Accuracy may be affected
and the instrument specifications are given with Fast mode Off.
Default is OFF
FM Dev Only
Allows you to select only the FM Deviation results. The results for Modulation
Rate, Distortion and SINAD are displayed as “---”. Measurement speed increases
when only FM Deviation results are returned. When No is selected, measurement
results for FM Deviation, Modulation Rate, Modulation Distortion and Modulation
SINAD are provided.
Adjusting the Detector, Auto Carrier Frequency, and High and
Low Pass Filters
Press Det/Demod hard key.
Detector
Selecting the
Peak + or Peak − allows you to check modulation symmetry. For
asymmetrical baseband waveforms, selecting
Peak + or Peak − will result in
different measurement results.
Peak+-/2
Displays the average value of the positive and negative peak readings.
RMS
Selects the average detector.
Peak Hold
Functional only when the detector is currently set to Peak + or Peak −. Holds the
maximum peak deviation peak positive or peak negative value from each time
measurement. Default is Off.
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