TB 9-4931-700-50
NOTE
Perform (1) through (6) below and repeat a above. If still out-
of-tolerance, perform (7) through (26) below.
(1) With thermal transfer standard in manual balance mode and dc output state,
adjust its manual balance controls to obtain ac/dc voltmeter indication equal to value of
TI voltage control setting.
WARNING
Do not adjust R5 or L3 with instruments floating above earth
ground. Mounting hardware for R5 and L3 is at circuit
ground.
(2) Set thermal transfer standard to ac balancing state. Adjust R5 (fig. 6) to
obtain null indication on thermal transfer standard meter X pushbutton pressed (R).
Figure 6. Model 746A top view -
Adjustment locations.
(3) Press FREQUENCY RANGE X10K pushbutton and adjust FREQUENCY
control to obtain FREQ scale indication of 10.0.
(4) Repeat (1) above.
(5) Set thermal transfer standard to ac balancing state. Adjust L3 (fig. 6) to
obtain null indication on thermal transfer standard meter with its null X5 pushbutton
pressed (R).
(6) Press OUTPUT OFF pushbutton.
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