TB 9-6625-1356-35
d. When indications specified in
paragraphs 8 through 13 are not within
tolerance,
perform the power supply check prior to making adjustments. After adjustments are made,
repeat paragraphs 8 through 13. Do not perform power supply check if all other
parameters are within tolerance.
e. Unless otherwise specified, all controls and control settings refer to the TI.
WARNING
HIGH VOLTAGE is used or exposed during the performance of
personnel fail to observe safety precautions. REDUCE
OUTPUT(S) to minimum after each step within the
performance checks where applicable.
NOTE
Remove TI protective cover only to make connections or
adjustments. Reinstall protective cover immediately after
connection or adjustment.
a. Rotate AMPLITUDE controls fully ccw. Set LINE switch to off.
b. Set 115/230 slide switch (rear panel) to 115.
d. Connect autotransformer to a
115 ac
power source and
adjust control for a
115 V ac
output.
e. Set LINE switch to ON and allow sufficient time for warm-up and stabilization.
f. Set LINE switch to off (down) and wait 30 seconds.
g. (Hewlett-Packard, Model 651A) If necessary, turn meter mechanical zero
adjustment screw cw until meter pointer is on 0 (zero).
h. (Hewlett-Packard, Model 651A) Turn adjustment screw approximately 15 degrees
ccw. If meter pointer moves, repeat g above and this step.
i. (All other models) insert pointed object into recess on adjustment wheel and rotate
wheel until meter pointer is exactly over 0.
j.
Set LINE switch to ON.
8. Frequency Accuracy and Stability
a. Performance Check
(1) Connect frequency counter to TI using a 50 Ω feed-through termination.