82 Chapter 3
Making Measurements
AM Depth Measurement
AM Depth Measurement
This procedure describes how to make an AM Depth measurement. In this
measurement example, a signal generator is the UUT and is adjusted to deliver a
modulated test signal.
The measurement results are:
AM Depth
Mod Rate
Mod Distortion
Mod SINAD
Measurement Procedure
Step 1. Setup the measurement system. See “System Hardware Connections” on page 44.
The power meter and N5532A/B Sensor Module are not used. Connect the signal
generator output to the PSA RF input.
Step 2. Adjust the signal generator for the desired settings for your test. Refer to the text of
Figure 3-9 for example settings.
Step 3. Configure the measuring receiver. On the PSA press
Mode, select Measuring
Receiver
, Measure, AM Depth.
Step 4. On the PSA, press
Frequency and enter the carrier frequency.
NOTE The measuring receiver Frequency Counter measurement can be used to measure
and set the carrier frequency on the PSA if the source modulation is turned OFF.
Modulation must be turned off for modulated signals since the modulation may
distort the signal spectrum and cause an error when using the frequency counter
function.
Step 5. Press
Restart.
NOTE Pressing Restart optimizes the measuring receiver configuration, and is very
important when changes to the measuring receiver settings or the UUT are made.
Pressing
Restart causes the measuring receiver to determine if the PSA settings are
correct for the incoming signal, and if they are not, slight changes are made. For
example if the UUT depth of modulation is changed, the PSA may require a
different IF BW setting for fast and accurate measurements.
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