Technical data

2-8 Agilent E7501A Getting Started
Performing Acceptance Test Procedures
Test 3. FM Accuracy
Test 3. FM Accuracy
Description This test is used to verify that FM modulation is working correctly.
The Agilent E6432A microwave synthesizer and the Racal 3153 arbitrary
waveform generator are configured for a modulation index of 2.404 which is
approximately a null of the Bessel function J
o
. 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.
The test is performed at carrier frequencies of 10 MHz and 20 GHz, with an
FM Rate of 200 kHz.
Equipment Required • Agilent E7501A arbitrary analog signal developer
• Agilent 8563E spectrum analyzer
Equipment Setup
NOTE All test equipment requires a 30 minute warm-up period to ensure warranted
performance. Both the Agilent E7501A arbitrary analog signal developer
and the Agilent 8563E spectrum analyzer need to be connected to a common
10 MHz reference.
When using the Agilent E7501A arbitrary analog signal developer, ensure
that Reference is set to External; the Reference can be selected from the RF
Source Control view.
Step 1. Use a high frequency 3.5 mm cable to connect the Agilent E7501A arbitrary
analog signal developer output to the input of the Agilent 8563E
spectrum analyzer.