TB 9-6625-2324-24
(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 0.249 and 0.251 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) I n c r e a s e c a l i b r a t o r o u t p u t t o 2 4 . 1 m V a n d n o t e t h a t U N C A L l i g h t
w i l l 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).
9. High Frequency Response
a. Performance Check
NOTE
Press FUNCTION FILT IN/OUT pushbutton to IN for
frequencies <10 kHz and to OUT for frequencies >10 kHz.
(1) Connect calibrator OUTPUT HI and LO to TI INPUT.
(2) Press and release all front panel pushbuttons to the out position, except POWER.
(3) Set calibrator for a 1 mV, 1 kHz output. TI will indicate between 0.98 and 1.02 mV.
Record TI indication.
(4) Set calibrator for a 10 mV, 1 kHz output. TI will indicate between 9.9 and 10.1 mV.
Record TI indication.
(5) Set calibrator for a 100 mV, 1 kHz output. TI will indicate between 99.5 and
100.5 mV. Record TI indication.