TB 9-6625-340-35
8. Automatic Zero
a. Performance Check
(1) Position controls as listed in (a) through (d) below:
(a) POWER RANGE switch to 1.0 MW, 0 DBM.
(b) COMP ATTENUATOR control fully ccw.
(c) POWER control to 0 on 0 to 1.0 scale.
(d) BIAS-READ switch to READ.
AT BOTTOM OF JCT
MSC00157
Figure 1. Test instrument - top view.
(3) Connect digital voltmeter (A5) between C22 (fig. 2) and chassis ground, using
two clips (B6).
(5) Set BIAS-READ switch to BIAS. If digital voltmeter indication is not same as
recorded in (4) above, perform b below.
5