artisan 8640B - Output Level Vernier and Meter Adjustment

Model 8640B TM 9-4935-601-14-7&P
ADJUSTMENTS
5-30. OUTPUT LEVEL KNOB ADJUSTMENT (Cont'd)
PROCEDURE:
1. Set Signal Generator's controls as follows:
Meter Function..........................................................................................LEVEL
COUNTER MODE: EXPAND ..........................................................................Off
LOCK..............................................................................................................Off
Source ...........................................................................................................INT
AM................................................................................................................OFF
FM ................................................................................................................OFF
RANGE.............................................................................................32 - 64 MHz
FREQUENCY TUNE................................................................................50 MHz
OUTPUT LEVEL...............................................................................As specified
RF ON/OFF ....................................................................................................ON
2. Set OUTPUT LEVEL RF attenuator knob one position ccw from full cw so that +13 dBm is in line with top edge of
white cursor range on front panel. If it does not line up, loosen knob's setscrews and align it. (The attenuator
and vernier knobs should not touch each other.)
3. Loosen setscrew in brass gear at rear of Al Output Level Assembly.
4. Set OUTPUT LEVEL vernier full cw. Using DVM, note voltage at VERN test point, A1A1TP1, on A1A1 RF
Vernier Assembly. It should be approximately 2 volts.
5. Adjust OUTPUT LEVEL vernier for half the voltage (at the VERN test point) noted in step 4 ±20 mV.
6. Without moving vernier, turn brass gear shaft until cursor points to +7.5 dBm on dial. Tighten setscrew in brass
gear.
7. Perform the Output Level Vernier and Meter Adjustment, paragraph 5-31.
5-31. OUTPUT LEVEL VERNIER AND METER ADJUSTMENT
REFERENCE:
Service Sheets 12 and 16.
DESCRIPTION:
The RF level accuracy for the upper OUTPUT LEVEL attenuator ranges is measured with a power meter and the
generator's output level and panel meter are adjusted at +13 dBm. For the lower ranges, a reference signal is
established on a spectrum analyzer display, the Signal Generator's OUTPUT LEVEL switch and the spectrum analyzer's
vertical scale log reference level control are stepped together, and any amplitude variations at -67 and -97 dBm are
measured on the analyzer's display. An RF attenuator and amplifier at the RF OUTPUT are adjusted for analyzer
compatibility and best sensitivity.
5-14
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