Agilent Technologies 8935 Series, Руководство пользователя

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Chapter 8 211
Performance Tests
RF Analyzer FM Accuracy Performance Test 20
RF Analyzer FM Accuracy
Performance Test 20
The purpose of this test is to verify that the Test Set meets the
specification limits in PTR (Performance Test Record)
Table 9-20, “RF
Analyzer FM Accuracy Test 20 Record,” on page 271 . The AM/FM test
source provides the RF signal with FM. The signal is measured both by
the Test Set’s internal RF analyzer and the measuring receiver. The FM
signal comes from the external audio source in the audio analyzer. The
audio level is varied until the modulation is at the desired FM deviation
as measured by the measuring receiver.
NOTE
Use the AM/FM test source output labeled FM÷32 for 12.5 MHz and the
output labeled FM for 400 MHz. You can measure the frequency with
the measuring receiver and adjust it with the carrier frequency tune
knob, but the exact frequency is not critical.
Figure 8-25 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 detector to RMS.
ANT IN
Audio Analyzer
Measuring Receiver
AM/FM Test Source
FM÷32 or FM OUTPUT
AUDIO
INPUT
OUTPUT
INPUT 50
Ω