Model 8640B TM 9-4935-601-14-7&P
PERFORMANCE TESTS
4-38. FM 3 dB BANDWIDTH TEST
SPECIFICATION:
FM 3 dB Bandwidth:
Internal and external AC; 20 Hz to 250 kHz.
External DC; dc to 250 kHz.
DESCRIPTION:
An audio spectrum analyzer is used to measure the 3 dB bandwidth. The analyzer is set to sweep over the specified
audio frequency range and its tracking generator output is used to frequency modulate the Signal Generator. The
generator's RF output is demodulated with an FM discriminator. The demodulated signal is fed to the analyzer's input
and any amplitude variation is measured on the analyzer's display. Bandwidth is checked at maximum deviation on the
8 16 MHz band.
Figure 4-24. FM 3 dB Bandwidth Test Setup
EQUIPMENT:
Audio Spectrum Analyzer.................................................HP 141T/8552B/8556A
FM Discriminator..................................................................................HP 5210A
Filter Kit (For Discriminator)...............................................................HP 10531A
PROCEDURE:
1. Connect equipment as shown in Figure 4-24 after setting Signal Generator's controls as follows:
Meter Function................................................................................................FM
COUNTER MODE: EXPAND ..........................................................................Off
LOCK ..............................................................................Off
Source............................................................................ INT
4-61
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