User`s guide

Agilent E6432A Microwave Synthesizer User’s Guide 1-43

Installation

Test 3. FM Accuracy

Description

The E6432A and the function generator are configured for modulation

indices corresponding to Bessel nulls of Jo. The amplitude of the

function generator is varied until the carrier being monitored on the

spectrum analyzer is a minimum. The function generator amplitude is

then recorded and compared to the theoretical value to calculate the

FM accuracy error. This test is also used for testing Option 002, low

rate FM.

Equipment Required:

33120A function generator

8563E spectrum analyzer

BNC Tee

BNC 50 ohm load

Equipment Setup:

NOTE All test equipment requires a 30 minute warm up period to ensure

warranted performance. The E6432A needs to have an external 10 MHz

reference connected. Ensure the external 10 MHz reference is selected

in the configuration pull down menu.

WARNING Function generator amplitudes greater than or equal to +15 V or less

than or equal to –15 V applied to the FM input will cause damage to

internal circuitry. Amplitudes greater than +8 V or less than –8 V may

cause distortion.

1. Connect a BNC Tee to the E6432A FM input.

2. Connect a 50 ohm load to one port of the BNC Tee.

3. Using a BNC cable connect the 33120A output to the other port of

the BNC Tee.

Due to the E6432A FM input impedance being 2 K ohm and the

33120A wanting to see a 50 ohm load; a BNC Tee and 50 ohm load

are used.