Model 8640B TM 9-4935-601-14-7&P
ADJUSTMENTS
5-28. METER ADJUSTMENTS
REFERENCE:
Service Sheet 17.
DESCRIPTION:
The panel meter is mechanically zeroed. The meter circuitry is then adjusted at zero and full scale.
EQUIPMENT:
Digital Voltmeter .......................................................................HP 3480B/3484A
PROCEDURE:
1. With LINE switch set to OFF, place Signal Generator in its normal operating position (e.g., if its normal operating
position is tilted up with the tilt stand locked down, place it that way).
2. Adjust mechanical zero adjustment screw on panel meter clockwise for a zero meter reading. Then turn screw
slightly counterclockwise to free mechanism from adjusting peg.
3. Set generator's controls as follows:
Meter Function................................................................................................FM
FM ................................................................................................................OFF
MODULATION FREQUENCY.................................................................1000 Hz
PEAK DEVIATION....................................................................................10 kHz
PEAK DEVIATION Vernier......................................................................Full ccw
RANGE.................................................................................................2 - 4 MHz
LINE................................................................................................................ON
4. Connect DVM to DC OUT test point (A2TP2) on A2 Meter Switch/Detector Assembly. Adjust DET OFFSET pot
(A2R5) for 0 Vdc ± 1 mVdc at A2TP2.
5. Connect DVM to MTR ADJ test point (A4TP1) on A4 Meter Annunciator Drive Assembly. Adjust DRIVER
OFFSET pot (A4R10) for 0 Vdc ± 1 mVdc at A4TP1.
6. Set FM to INT. Adjust PEAK DEVIATION vernier clockwise until DVM reads 9.766 Vdc at A4TP1. Then adjust
F.S. METER pot (A4R19) for a full scale reading (10 on the 0-10 scale) on the panel meter.
5-29. RF DETECTOR OFFSET ADJUSTMENT
REFERENCE:
Service Sheets 12 and 13.
5-12
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