TB 9-6625-1356-35
NOTE
Perform (6) and (7) below for Model 652A only.
(6) Position controls as listed in (a) through (e) below:
(a) FREQUENCY RANGE switch to X10K.
(b) FREQUENCY dial to 1.
(c) OUTPUT AMPLITUDE and VERNIER controls for a 2.925 V indication
on multimeter.
(d) OUTPUT MONITOR switch to EXPAND.
(e) REF SET and VERNIER controls for a -2.5 indication on TI percent scale.
(7) Adjust OUTPUT AMPLITUDE and VERNIER controls for a +2.5 indication
on meter percent scale. If multimeter does not indicate between 3.0690 and 3.0810 V,
perform b (3) and (4) below.
b. Adjustments
(1) Adjust AMPLITUDE controls for a 3.00 V indication on multimeter.
(2) Adjust A1R23 (fig. 1) for a 3 V indication on TI meter (R).
(3) Adjust OUTPUT AMPLITUDE and VERNIER controls for a 3.075 V
indication on multimeter.
(4) Adjust A3R14 (fig. 2) for a +2.5 indication on TI meter percent scale (R).
10. Frequency Response
a. Performance Check
(1) Connect thermal converter to TI 50 Ω connector.
(2) Connect multimeter to thermal converter output.
(3) Set FREQUENCY RANGE switch to X100 and turn FREQUENCY dial to 4.
(4) Set OUTPUT MONITOR switch to NORMAL (Model 652A only).
(5) Adjust AMPLITUDE controls for a 2.40 V indication on TI meter. Record
multimeter indication (reference voltage).
(6) Connect thermal converter to calibrator.
(7) Connect multimeter to thermal converter output.
(8) Adjust controls of calibrator until multimeter reference voltage indication is
same as recorded in (5) above.
(9) Adjust controls of calibrator for +2 percent of indicated voltage. Record
multimeter indication.
(10) Adjust controls of calibrator for -2 percent of indicated voltage.
(11) Repeat technique of (9) and (10) above for reference voltage + (plus) and - (minus) 1,
3, and 4 percent (3 and 4 percent only for Model 651A).
