TB 9-6625-2057-24
CAUTION
On models with rechargeable batteries, do not apply 115 V ac if
batteries are removed; otherwise, damage will result.
NOTE
On models that are battery operation only, disregard b and c
below.
b. Connect TI to autotransformer.
c. Connect autotransformer, to a 115 V ac source and adjust for 115 V output.
d. Position controls as listed in (1) through (3) below:
(1) FREQ dial to 5.
(2) FREQ VERNIER control to center position.
(3) RANGE switch to X1.
e. Wait 20 minutes for equipment to warm-up and stabilize.
15. Frequency Accuracy and Stability
a. Performance Check
to frequency counter using voltage divider.
(1) Connect OUTPUT 600
(2) Adjust AMPLITUDE control fully cw. If frequency counter does not indicate
between 4.85 and 5.15 Hz, perform b below.
NOTE
On models that are battery operation only, disregard (3) and (4)
below.
(3) Vary autotransformer output between 105 and 125 V ac. Frequency counter
indication will remain between 4.85 and 5.15 Hz.
(4) Adjust autotransformer output to 115 V ac.
(5) Set RANGE switch and FREQ dial for settings listed in table 6. If frequency
counter does not indicate within limits specified, perform b below.