TB 9-6625-2802-35
perform power supply check if all other parameters are
NOTE
within tolerance.
Unless otherwise specified, verify the
7. Equipment Setup.
results of each test and, whenever the
test requirement
is not met, take
a. Remove protective cover from TI as required for
corrective action before continuing with
adjustments.
the calibration. Adjustments required to
b. Position controls as listed in (1) through (6)
calibrate the TI are included in this
below:
procedure.
Additional maintenance
information is contained in TM 9-6625-
(1) PEN POSITION: centered
2802-14&P for this TI.
(2) CHART SPEED: STOP
NOTE
(3) LINE switch: OFF
When indications specified in
(4) EVENT MARKERS, 1 SEC/MARK:
within tolerance, perform the
MARK
power supply check prior to
making adjustments After ad-
(5) Preamplifier INPUT:
ZERO
austments are made, repeat par-
agraphs 8 through 12Do not
(6) Preamplifier V/DIV:
5
SECTION IV
CALIBRATION PROCESS, PREAMPLIFIER
NOTE
Unless otherwise specified, verify the results of each test and take corrective action whenever the test
requirement is not met before continuing with the calibration.
NOTE
The following paragraphs contain circuit checks and adjustments that are used to assure proper circuit
performance. Be sure to perform the checks in sequence; some checks assume previous settings.
8. DC Balance
(3) Set CHART SPEED to 1 mm/sec
and position CHANNEL 1 pen to
a. Performance Check
center line of grid.
(1)Set INPUT switch to
(4) Set INPUT switch to OPR. If
ZERO, range switch to
pen does not track grid line 15
1 mV /DIV and CAL control
millimeters left of center line
fully clockwise
within +0.5 mm, perform adjust-
ment in paragraph 8 b.
(2)Set dc voltage standard
(5) Set INPUT switch to ZERO and
(Al) to +15 mV and apply
apply -15 millivolts to the pre-
to input of preamplifier
amplifier input.
6
