HP 4262A - DC Power Supply Adjustment; Adjustment

Section V Model 4262A
Paragraph 3-20
ADJUSTMENT
5-20. DC POWER SUPPLY ADJUSTMENT.
PURPOSE:
To adjust regulated +12V DC Supply (A9).
Note
Only +12V DC supply can be adjusted.
To A9 TP4
To Chossis
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DC VOLTMETER
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Figure 5-1. Power Supply Voltage Adjustment.
EQUIPMENT:
DC Voltmeter ................. HP5300A/w5306A
PROCEDURE:
a. Connect DC voltmeter plus input to test point A9TP4 (+12V ) and minus input
to 4262A chassis with dual banana plug to alligator clip cable. See Figure 5-1.
b. Set DC Voltmeter range as appropriate for measuring +12 volts.
c. Adjust “+12V” potentiometer A9R6 for +12 volts+0.05 volts (see Figure 8-22 for
location).
d. After adjustment of +12V, check dc voltages at test points listed below:
Test Point Voltage Limits
A9TP5 -12V £0.15V
A9TP6 +5V £0.15V
e. Remove cables and DC voltmeter from 4262A.
Notes
1. DC supply voltage ripple should be equal to
or less than the allowable limits given
below.
DC supply voltage Ripple voltage
+12V at A9TP4 < 30mVp-p
-12V at A9TP5 < 30mVp-p
+5V at A9TP6 < 50mVp-p
5-6