HP 4262A - Page 115

Section V Model 4262A
Figure 5-6
ADJUSTMENT
5-10
PROCEDURE:
Note
The Al12 board offset adjustment (paragraph
5-22) must precede these adjustments. The
adjustments in these steps can be performed
separately, but steps (1) and (2) must be per-
formed prior to step (3).
(1) OFS -1 ADJUSTMENT.
a. Connect BNC to dual alligator clip cable between oscilloscope and 4262A test point
A13TP1 and 4262A chassis (see Figure 5-5).
b. Set 4262A controls as follows:
DCBIAS . . ... i i OFF
SELFTEST. .........ccciviviinn... OFF
FUNCTION. . ..ottt e it e e i i e L
CIRCUITMODE. . .........cciiiiiina... SER
LOSS. .. e D
TESTSIGNAL . .......... ... 1kHz
LCRRANGE ..................... MANUAL
(Set to 100mH range)
DQRANGE ......... ... .. AUTO
TRIGGER. .. ....... ... .. INT
¢. Short-circuit the four UNKNOWN terminals together.
d. Set oscilloscope controls as follows:
VOLTS/DIV . ... i 0.005V
TIME/DIV. ... ...... ... ..., 0.5msec
TRIGGER. ... ....... .. ... .., INT
SWEEPMODE ...................... AUTO
Input........ .. . . e GND
e.
Adjust
position
control
of
oscilloscope
so
that
baseline
is
centered
on
the
CRT.
f. Set oscilloscope INPUT to DC.
€.
Adjust
“OFS-1”
potentiometer
A13R1
until
dc
level
of
displayed
waveform
is
OmV
+1mV.
Refer
to
Figure
5-6
which
shows
well
adjusted
waveform.
Figure 5-6. Waveform at A13TP1.