Model 8640B TM 9-4935-601-14-7&P
ADJUSTMENTS
5-34. RANGE SWITCH ADJUSTMENT (Cont'd)
3. Loosen RANGE switch knob, position it so that it indicates that the range is 0.5 - 1 MHz, and tighten it.
4. Set RANGE switch to each of its other positions (from both directions). The frequency counter should display
readings that agree approximately with generator's readout (the correct frequency counter reading for the EXT
DOUBLER 512 - 1024 MHz position is approximately 256 MHz).
5-35. V
T
POT (A3R1) ADJUSTMENT
REFERENCE:
Service Sheet 5.
DESCRIPTION:
The VT pot is aligned so that it will not hit either end-stop as the FREQUENCY TUNE control is tuned through its full
range. This adjustment should be performed whenever the pot has been replaced.
Figure 5-3. V
T
Pot Adjustment
5-21
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