TM 9-6625-2802-35
(6) Set INPUT switch to OPR. Pen should
track grid line 15 millimeters right of center
output as observed on oscilloscope.
line, + 0.5 mm.
(5) Connect cable assembly (B2) to the
(7) Repeat steps (1) through (6) above for
preamplifier output CHANNEL OUT 1 of
channel 2.
terminal block on the back so as to
b. Adjustments.
If a null is not evident, perform
(1) Turn LINE switch to OFF and remove dc
voltage standard.
(6) Repeat steps (1) through (5) above for
channel 2.
out of chassis, remove its cover and
b. Adjustments.
reinsert it into the chassis.
(1) Adjust resistor R9 on range switch (see
fig. 3) for an
amplitude null as
observed
(3) Connect cable assembly (B2) from the
on oscilloscope at CHANNEL OUT 1
terminal block (rear panel).
(2) Disconnect variable power transformer
(4) Set LINE switch to ON and INPUT switch
(A8).
to ZERO.
(5) Adjust PREAMP BAL resistor (R13) (see
9. Attenuator Balance.
a. Performance Check.
and range switch to .5V/DIV.
(2) Use adapter (B1) to connect cable
(3) Connect variable power transformer (A8)
connect isolation power transformer (A3)
through power cable (B4) to the
preamplifier input.
(4) Use cable assembly (B2) to monitor the ac
output from variable power transformer on
a. Performance Check.
oscilloscope;
set
variable
power
(1) Use cable (B3) to connect dc voltage
standard (Al) to the channel preamplifier
input.
8