Yo Driver Gain And Linearity; Yo Gain And Linearity Break Points - Agilent Technologies 83620A Service Manual

7. YO Driver Gain and Linearity

Description and Procedure
No test equipment is required for these adjustments.
For the gain adjustment, the synthesizer's internal DVM monitors the YO
loop error voltage at two frequencies (points B and C in Figure 3-11). When
you select the gain potentiometer adjustment, the synthesizer displays the
di erence in voltage between points B and C as a \needle" with arrows on
either side. By adjusting A13R54 to center the \needle", you equalize the
voltage between the two frequency points.
he linearity adjustment has two parts (each of which is selected and adjusted
similarly to the gain adjustment). he low break point adjustment equalizes
the voltage between points A and B in Figure 3-11. he high break point
adjustment equalizes the voltage between points C and D.
You must adjust the gain rst; then adjust the break points.
Note
Figure 3-11. YO Gain and Linearity Break Points
1. urn the synthesizer on and press
hour.
2. Select the A13 gain menu. Press:
Adjust Menu AssyAdj Menu A13 Adj Menu A13 Gain Menu
SERVICE
5
3-26 Adjustments
YO Driver Gain and Linearity
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. Let it warm up for at least one
PRESET
5
HP 8360