TB 9-4935-367-24
repeat paragraphs 8 through 12.
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.
7. Equipment Setup
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable.
a. If necessary, zero-set meter by turning slotted disk below meter face until meter
pointer indicates zero.
b. Remove TI protective cover as required for adjustment.
c. Connect TI to autotransformer.
d. Connect autotransformer to a 115 V ac source and adjust for a 115 V output.
e. Set POWER switch to ON and allow at least 15 minutes for equipment to warm-up
and stabilize.
f. Disconnect output level guard strap.
8. Frequency Accuracy and Stability
a. Performance Check
(1) Connect OUTPUT to frequency counter using voltage divider.
(2) Position controls as listed in (a) through (d) below.
OUTPUT ATTENUATOR switch to 3 V.
(a)
(b)
Frequency dials to indicate 999.9 kHz.
VERNIER control to centerline.
(c)
AMPLITUDE control for 3 V indication on output meter.
(d)
(3) Measure frequency.
Frequency counter will indicate between 997.900 and
1,001,900 Hz.
(4) Set frequency dials to settings listed in table 3. Frequency counter will indicate
within limits specified.