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SECTION 5 MEASUREMENT
(1) Setup
Fig. 5-3. Measuring Selectivity in 20 dB NQ Method
(2) Measurement procedure (Pass band width)
STEP PROCEDURE
1. Set the MG3641A/MG3642A frequency, output level, and FM receiver setting into the 20 dB NQ sensitivity
mode.
2. Place the MG3641A/MG3642A into the relative level display mode and set the output level resolution to 1
dB.
3. Clockwise turn the rotary knob of Output to increase the MG3641A/MG3642A output level by 6 dB as
compared with the 20 dB NQ sensitivity (set the display of the output level indicator to +6 dB).
4. Set the MG3641A/MG3642A frequency resolution to 100 Hz.
5. Clockwise turn the rotary knob of Edit to reduce the frequency and adjust it until the 20 dB NQ sensitivity is
obtained again.
6. Place the MG3641A/MG3642A into the relative frequency display mode.
7. Clockwise turn the rotary knob of Edit to increase the frequency and adjust it until the 20 dB NQ sensitivity
is obtained again.
8. The value indicated by the Frequency indicator is the pass band width.
MG3641A/MG3642A
DA FM RX DL LM
(154.45MHz)
Pseudo-
antenna
FM
receiver
Standard
pseudo-load
Level
meter