Am/Fm Dac O Set And Gain (Option 002) - Agilent Technologies 83620A Service Manual

15. AM/FM DAC Offset and Gain (Option 002)
Description and Procedure
No test equipment is required for this procedure. his procedure calibrates
the modulation generator assembly by adjusting the AM and FM DACs. he
internal DVM measures the DAC output voltages. he DAC o set is then
zeroed with this adjustment procedure and the DAC gain is automatically
calibrated with calibration constants.
1. urn the synthesizer on and press
at least one hour.
2. Select the A8 adjustment menu. On the synthesizer, press:
Adjust Menu AssyAdj Menu A8 Adj Menu
SERVICE
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3. he
adjustment is automatically selected (asterisk on).
AM DAC
4. Adjust A8R111 (see Figure 3-27) to center the \needle" on the display.
Figure 3-27. A8R111 and A8R105 Adjustment Locations
5. Select
(asterisk on).
FM DAC
6. Adjust A9R105 (see Figure 3-27) to center the \needle" on the display.
3-100 Adjustments
AM/FM DAC Offset and Gain
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. Let the synthesizer warm up for
PRESET
5
HP 8360