Zero Detector & Apao - HP 4262A Operating And Service Manual

Model 4262A Section V
Figure 5-11
ADJUSTMENT
(2) ZERO DETECTOR & APAO ADJUSTMENT.
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DUT BOX
PROCEDURE A.
(a)
Figure 5-11. Zero Detector & APAO Adjustments.
Note
If DUT Box is available, use procedure A. If
not, use procedure B.
(b)
a. Adjust "ZOF" potentiometer A14R1 for 1000 counts £1 count on 4262A LCR
display.
b. Adjust "APAO" potentiometer A14R15 for .000 to .001 count on 4262A DQ
display.
c. Set 4262A TEST SIGNAL control successively to each test frequency and test signal
level shown in Table 5-5 and confirm that DC voltmeter readings are within 0 to
+4 volts at each control setting. Also confirm that 4262A LCR display and DQ
display are within the tolerances described in steps a and b.
Table 5-5. TEST SIGNAL Settings.
Frequency Low Level
120Hz off
1kHz off
10kHz off
120Hz on
1kHz on
10kHz on
Note
If result of confirmation check is not satis-
factory, readjust "OFS-4" potentiometer
Al3R67 for any voltage between +1 volt and
+3 volts to satisfy the requirements of step
c. If this adjustment fails to bring the volt-
age at A14TP3 to within its tolerance orto
satisfy the confirmation check, refer to Sec-
tion VIII for troubleshooting,
5-15