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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

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Agilent Technologies E4438C Guia de Instalação Página 64