TB 9-6625-1918-24
(3) Adjust ZERO SET COARSE and FINE controls for a 0.190 Vac indication
on multimeter.
(4) Adjust R63 FS ADJ (fig. 1) for a full-scale indication on TI meter (R).
9. Bridge Balance
a. Performance Check
(1) Connect multimeter between TEST POINT 1 (fig. 2) and chassis ground. For
TS-779B/U and General Microwave Model 451, connect multimeter to junction of R2 and S1
and terminals 4 and 5 (fig. 3).
Figure 2. Test instrument - top view.
(2) Set BOLO BIAS CURRENT (BIAS CURRENT on TS-779/U) switch and
adjust ZERO SET COARSE and FINE controls for a 3.0 V ac indication on multimeter.
(3) Connect multimeter between bolometer and TI BOLOMETER connector.
If
multimeter does not indicate between 0.98 and 1.02 V ac, perform b below.