HP 8901B

Model 8901B Adjustments
0 0
INPUT
0 0000 FY+4
;;:;; nnoooo O omo o
0 0 0 000000 00000 0
00000 0 OUTPUT
00
Adjustment 13
0 0
0 0 0 0 0 0
QM SENSITIVITY
Service Sheet 13
Description
The AMFM test source is frequency modulated with a s-wsoidal signal at a 1 kHz rate and w
Wz peak deviation. This is equivalent to 100 rad peak deviation since
100
frequency deviation
modulation
rate
phase deviation =
The iPM sensitivity is adjusted for a reading of 100 rad.
Equipment
AMFM Test Source ............................................................. HP 11715A
Audio Synthesizer.
................................................................ HP 3336C
AUDIO
AUDIO SYNTHESIZER
OUTPUT
~~
Figure 5-6. @M Sensitivity Adjustment Test Setup
Procedure
1. Connect the equipment as shown in Figure 5-6. (The AMFM test source output can be connected
either to a sensor module or directly to the Modulation Analyzer’s INPUT.)
2. Set the audio synthesizer to 1 kHz at +4 am. On the AMFM test source, set the test mode
to FM.
3. On the Modulation Analyzer, press the blue key then press INSTR PRESET (the AUTOMATIC
OPERATION key) to preset the instrument. Set HP FILTER
to 300 Hz and LP FILTER to
3 kHz.
4. !kne the AMFM test source’s carrier frequency to approximately 100 MHz.
5. On the Modulation Analyzer, press the MHz key to center its tuning. Press FM. Adjust the audio
synthesizer for a display of 100 kHz on the Modulation Analyzer.
Adjustment 13 5-21