artisan 8640B - Output Level Knob Adjustment

Model 8640B TM 9-4935-601-14-7&P
ADJUSTMENTS
5-29. RF DETECTOR OFFSET ADJUSTMENT (Cont'd)
DESCRIPTION:
A digital voltmeter is used to set the proper offset voltage out of the RF detector.
EQUIPMENT:
Digital Voltmeter .......................................................................HP 3480B/3484A
PROCEDURE:
1. Connect DVM to DET test point, A26A1TP1, and set Signal Generator's controls as follows:
COUNTER MODE: EXPAND ..........................................................................Off
LOCK...............................................................................Off
Source............................................................................ INT
AM................................................................................................................OFF
FM ................................................................................................................OFF
RANGE.............................................................................................32 - 64 MHz
FREQUENCY TUNE.................................................................................50MHz
RF ON/OFF.................. ................................................................................OFF
2. Set AGC Switch, A26A4S1, to off. Adjust Detector Adjust pot, A26A1R11, for -61 ±2 mVdc at DET test point.
3. Set AGC switch to on and set front panel RF ON/OFF switch to ON.
4. Perform Output Level Vernier and Meter Adjustment, paragraph 5-31.
5-30. OUTPUT LEVEL KNOB ADJUSTMENT
REFERENCE:
Service Sheets 13 and 16.
DESCRIPTION:
The RF attenuator knob is set, and the vernier voltage is monitored with a digital voltmeter and the vernier pot is
adjusted. Then the vernier cursor is set. This procedure should be performed whenever the OUTPUT LEVEL knobs
have been removed.
EQUIPMENT:
Digital Voltmeter .......................................................................HP 3480B/3484A
5-13
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com