Model 8640B TM 9-4935-601-14-7&P
CHANGE 24
Page 5-35/5-36:
Add the attached paragraph 5-42.
5-42. PHASE LOCK ERROR VOLTAGE ADJUSTMENT
REFERENCE:
Service Sheet 21.
DESCRIPTION:
When the instrument is operating in the normal count mode, a nominal mid-range (phase lock error) voltage should exist
at test point A8A2TP6. A mid-range voltage ensures that the generator will maintain phase lock when the oscillator shifts
up or down in frequency.
EQUIPMENT:
Digital Voltmeter................................................................. HP 3480B/3484A
PROCEDURE:
1. Set Signal Generator's controls as follows:
COUNTER MODE: LOCK ....................................................................... Off
2. Connect one lead of the voltmeter to testpoint A8A2TP6 and the other lead to ground. Adjust potentiometer
A8A2R58 for a voltmeter reading of +11.5 + 1.OVdc.
Page 6-2, Table 6-1:
Change A8A2 as follows:
Part Number
New Assy: 08640-60258.
Page 6-13, Table 6-3:
Change A8A2 08640-60189 to 08640-60258.
Page 6-14, Table 6-3:
Delete A8A2C27, C28, C29 and C30.
Change A8A2R28 to 0698-7258 RESISTOR; FXD; 8.25K 2% 0.05W F TUBULAR.
Page 6-15, Table 6-3:
Add A8A2R58 2100-2497 RESISTOR, VAR., TRMR, 2K OHM 10% C TOP ADJ.
Service Sheet 20 (component locations):
Replace Figure 8-61 with attached figure.
7-52
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