
Chapter 8 213
Performance Tests
RF Analyzer FM Distortion Performance Test 21
RF Analyzer FM Distortion
Performance Test 21
The purpose of this test is to verify that the Test Set meets the
specification limits in PTR (Performance Test Record) Table 9-21, “RF
Analyzer FM Distortion Test 21 Record,” on page 272. An audio signal
from the audio analyzer provides FM for the AM/FM test source. The
AM/FM test source provides an RF signal (with FM) to the Test Set’s
internal RF analyzer. The measuring receiver is used to monitor FM
deviation as the level of the audio signal from the audio analyzer is
varied. The audio analyzer then measures distortion introduced by the
Test Set.
Figure 8-26 Setup
Procedure
1. On the AM/FM test source, set the test mode to FM.
2. On the measuring receiver:
a. Reset the instrument.
b. Set the measurement mode to FM.
c. Set the high-pass filter to 300 Hz.
d. Set the low-pass filter to 3 kHz.
3. On the audio analyzer:
a. Reset the instrument.
ANT IN
Audio Analyzer
Measuring Receiver
AM/FM Test Source
FM OUTPUT
AUDIO
INPUT
OUTPUT
INPUT 50Ω
INPUT
AUDIO
MONITOR
OUT
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