TB 9-6625-2324-35
(13) Disconnect calibrator from TI.
(14) Disconnect short from TP204 and TP209 (fig. 1).
(15) Press and release FUNCTION AC+DC/AC pushbutton to AC.
(16) Press RANGE HOLD/AUTO pushbutton to HOLD and STEP UP
pushbutton to 20 mV range.
(17) Connect calibrator OUTPUT HI and LO to TI INPUT.
(18) Set calibrator for a 23 mV, 500 Hz output.
(19) Increase calibrator output in increments of 0.1 mV while observing TI
UNCAL annunciator light. If annunciator light does not illuminate from between 23.5
and 24.5 mV, perform b(5) through (11) below.
(20) Press and release RANGE HOLD/AUTO pushbutton to AUTO.
b. Adjustments
(1) Adjust R101 (fig. 1) until TI indicates one-tenth of value recorded in a(4)
above (R).
(2) Press and release RANGE HOLD/AUTO pushbutton to AUTO and repeat
a(4) through (6) above.
NOTE
Due to the coarseness of adjustments in (3) and (4) below, it
is only necessary to adjust within the tolerance listed.
(3) Adjust R72 (fig. 1) until TI indicates between 2.49 and 2.51 V (R).
(4) Adjust R26 (fig 1.) until TI indicates between .249 and .251 V and repeat a(8)
through (10) above (R).
(5) Connect multimeter INPUT HI to TI TP4 (fig. 1) and INPUT LO to TI
chassis ground.
(6) Remove tape dot from adjustment R127 and turn R127 (fig. 1) fully ccw.
(7) Set calibrator for a 24 mV, 200 Hz output. UNCAL light will be illuminated.
(8) Slowly turn R127 (fig. 1) cw to exact point where UNCAL annunciator light
(9) Increase calibrator output to 24.1 mV and note that UNCAL light will
illuminate.
(10) Set calibrator for a 250 mV, 2 kHz output. Multimeter indication will not
vary by more than 20 mV from indication recorded in (8) above.
(11) Disconnect multimeter from TI and replace tape dot on R127 (fig. 1).
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