Tektronix SPECMON3 Manual page 139

Analog Modulation
Setting
Parameters (see page 127)
Trace (see page 128)
Scale (see page 131)
Prefs (see page 132)
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Parameters Tab
The Parameters tab enables you to specify two parameters that control the carrier amplitude detection.
Setting
Average
Median
Measurement BW
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AM Modulation
An amplitude modulated carrier can be described mathematically by:
A, in the above equation, represents the carrier amplitude, a(t) represents the time-varying modulation
and ω represents the carrier frequency.
0
The signal modulation envelope is given by:
There are several ways to express the AM modulation depth, expressed as a percentage.
Peak method
Trough Method
Max-Min Method
SPECMON3 & SPECMON6 Printable Help
Description
Sets the Carrier Amplitude Detection method. You can choose either Average or Median.
Sets Trace display parameters.
Sets vertical and horizontal scale and position parameters.
Specifies whether or not certain display elements are shown. Specifies the maximum
number of points shown in the display graph.
Description
Selects the Average method for computing the average baseline for measurements.
Selects the Median method for computing the average baseline for measurements.
Specifies the bandwidth about the center frequency at which measurements are made.
Parameters Tab
127