Installation guide

Performance Tests
Phase Modulation Frequency Response
3-16
Phase Modulation Frequency Response
This automated test verifies the phase modulation frequency response specifications. The equipment
measures the variations in phase deviations due to changes in the applied ΦM rate; dc to 100 kHz. The
response is relative to a 1 kHz reference at the same phase deviation, and expressed in dB. Each frequency is
tested with the following sequence:
1. A reference signal is measured.
2. The set deviation is measured for each applied rate change.
3. Each deviation measurement is compared to the reference signal deviation.
The comparison is a calculation of the difference in the deviations relative to the reference rate. The relative
value is the ΦM frequency response.
Recommended Equipment
• Agilent 8902A measuring receiver
• Agilent 8904A function generator
Equipment Setup
Figure 3-14 Phase Modulation Frequency Response Setup