TB 9-6695-261-35
d. When indications specified in
paragraphs 8 through 12 are not within
tolerance,
perform the power supply check prior to making adjustments. After adjustments are made,
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.
WARNING
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. Set RMS VOLTS switch to 5-6.
b. Turn RMS VOLTS vernier control fully ccw.
c. Set FLOATING/CHASSIS grounding switch (on earlier models, located on rear of
chassis) to CHASSIS position.
d. Turn FREQUENCY VERNIER CAL control fully ccw.
e. Turn SQUARE WAVE P-P VOLTS control fully ccw.
g. Connect autotransformer to a
115 V ac
source and
adjust for a
115 V
output.
h. Set POWER switch to ON and allow sufficient time for warm-up and stabilization.
a. Performance Check
NOTE
TI covers must be in place during performance checks. Slide covers back to
make connections or adjustments, then slide covers back in place before
continuing.
(1) Connect frequency counter to ∼ OUTPUT connector using 50 Ω termination.
(2) Press FREQUENCY Hz pushbuttons to indicate 1-0-0 and press
MULTIPLIER 1000 pushbutton. If
frequency counter does not
indicate between 99,000
and 101,000 Hz, perform b (2) below.
(3) Press FREQUENCY Hz pushbuttons to indicate 4-0-0. If frequency counter
does not indicate between 396,000 and 404,000 Hz, perform b (4) below.
(4) Press FREQUENCY Hz pushbuttons to indicate 9-9-9. If frequency counter
does not indicate between 989,010 and 1,008,990 Hz, perform b (6) below.
(5) Repeat technique of (2) above, using FREQUENCY Hz and MULTIPLIER
pushbutton settings listed in table 3. If frequency counter does not indicate within limits
specified perform b below.