Adjustments

TB 9-6625-1942-24

(12) Adjust dc voltage divider to 1.000000

(13) Set calibrator output to +10 V dc.

(14) Set RATIO switch to EXT REF 10V. Record TI indication.

(15) Reverse polarity of both the INPUT and EXT REF terminals on TI. If TI

indication is not within 1 count of reading recorded in (14) above, perform b (5) below.

(16) Set calibrator output to 1.0 V and set RATIO switch to EXT REF 1V. Record

TI indication.

(17) Reverse polarity of both the INPUT and EXT REF terminals on TI. If TI

indication is not within 1 count of reading recorded in (16) above, perform b (6) below.

(18) Repeat (15) through (17) as required.

(19) Set RATIO switch to EXT REF 10V.

(20) Adjust output of calibrator to 10 V dc.

(21) If TI does not indicate between 9.9993 and 10.0007, perform b (7) below.

(22) Adjust output of calibrator to 1.0 V dc.

(23) If TI does not indicate between 9.9982 and 10.0018, perform b (8) below.

(24) Position controls as listed in (a) through (c) below:

(a) RATIO switch to INT REF.

(b) FUNCTION switch to TEST.

(25) The TI will alternately indicate a positive and negative reading between 0.99992

and 0.99999 1 count.

Record both indications.

If TI does not indicate within

specifications, perform b (9) below.

(26) Set RATIO switch to EXT REF 10V and adjust calibrator output for a 10 V

output. TI will indicate the same as recorded in (25) above. Record positive indication. If

TI does not indicate as stated in (25) above, perform b (9) and (10) below.

b. Adjustments

(1) Adjust A13R17 OFFSET 3 (fig. 1) for 0 indication on TI. If the display goes into

overload, reverse polarity of calibrator and adjust A13R17 OFFSET 3 in the opposite

direction for a 0 indication on TI (R).

(2) Adjust A13R8 OFFSET 1 (fig. 1) for 0 indication on TI with positive and negative

10 V applied to INPUT terminals of TI (R).

(3) Repeat (1) and (2) above until TI indicates 0 0.0001 V for both positive and

negative inputs on both 1 V and 10 V EXT REF ranges.

(4) Adjust A13R7 BIAS ADJ (fig. 1) for 0 indication on TI with both positive and

negative 10 V input applied from calibrator (R).