84 Chapter 3
Making Measurements
AM Depth Measurement
Default is Free Run.
When trigger source
Video is selected, the default trigger level is − 6dBm. To
adjust, press the
Trig hardkey, then Level.
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.
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
AM Depth Only
Allows you to select only the AM Depth results. The results for Modulation Rate,
Distortion and SINAD are displayed as “---”. Measurement speed increases when
only AM Depth results are returned. When No is selected, measurement results for
AM Depth, Modulation Rate, Modulation Distortion and Modulation SINAD are
provided.
Adjusting the Detector, 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.
To Next Page
Loading...
Need help?
General
