HP 4262A - Page 119

Section V Model 4262A
Figure 5-10
ADJUSTMENT
PROCEDURE:
(1) OFS - 4 ADJUSTMENT,
a. Connect DC voltmeter minus input to test point A14TP3 and plus input to 4262A
chassis with dual banana plug to alligator clip cable. See Figure 5-9.
b. Set DC voltmeter range as appropriate for measuring +3 volts.
c. Set integrator test switch A22S1 (located at upper right on A22 Display Control and
RAM Board Assembly) to TEST 1 position. See Figure 5-10 which shows location of
switch S1.
%— A22 Board Assembly
5 ] @ { o h
Figure 5-10. A22S1 Switch Setting.
d. Set 4262A controls as follows:
DCBIAS. ... ... . it i, OFF
SELFTEST......... ... . ..., OFF
FUNCTION. . ... C
CIRCUITMODE. ............... ... ..., PRL
LOSS. ... e D
TESTSIGNAL . .......ciiiiiiiieenn. 1kHz
LCRRANGE ....................... AUTO
DQRANGE ............. ..ot AUTO
TRIGGER........... ..., INT
e. Connect nothing (open, co Q) to UNKNOWN terminals.
Note
High terminals (Hror and Hcur) and Low
terminals (Lcur and Lpot), respectively, must
be connected together.
f. Adjust “OFS-4” potentiometer A13R67 for +2 volts 0.5 volts (the voltage is actually
negative).
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