TB 9-6625-1924-24
7. Equipment Setup
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable.
a. Turn TI FUNCTION switch to OFF.
b. After 1 minute, observe meter needle. If meter needle is not on zero, adjust
mechanical zero adjustment, located below meter face until needle is exactly on zero.
c. Set BATT/LINE slide switch (option 01 only) located on rear panel to BATT.
d. Turn FUNCTION switch to BATT/1.5V MIN. If TI meter does not indicate 1.5 or
more on 0 to 3 scale, replace batteries.
8. Amplifier Balance and Zero Offset
a. Performance Check
(1) Set FUNCTION switch to +DCV and RANGE switch to .1.
(2) Short TI VOLTS terminal to COM terminal.
(3) Adjust TI DC ZERO/
control until TI meter indicates zero on top scale.
(4) Remove short connected in (2) above. If TI meter does not indicate zero, perform
b (1) and (2) below.
(5) Turn DC ZERO/
control fully to the right and record meter indication.
(6) Turn FUNCTION switch to -DCV and turn DC ZERO/
fully to the left. If
meter indication is not the same as recorded in (5) above, perform b (3) below.
NOTE
FUNCTION switch must be in +DCV position for a (5) above
and in -DCV position for a (6) above.
b. Adjustments
(1) Adjust A2R7 DC OFFSET ADJ (fig. 1) until TI meter indicates zero (R).