TB 9-4920-453-24
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. Connect TI to autotransformer and connect autotransformer to 115 V ac source.
b. If necessary, turn adjusting screw, located below meter face, for a 0 indication on meter.
c. Position controls as listed in (1) through (5) below:
(1) CALIBRATE SIGNAL control fully ccw.
(2) SENSITIVITY controls 1, 2, 3, and 4 fully ccw.
(3) CHANNEL switch to 1.
(4) INPUT NETWORK switch to OUT.
(5) RANGE switch to OFF.
d. Set power switch to on (upper) position and allow approximately 15 minutes for
equipment to warm-up and stabilize.
8. Velocity Displacement and Stability
a. Performance Check
(1) Connect calibrator to TI INPUT CHANNEL 1 pins 1 () and 2 (+) (located on
rear of TI) using appropriate electrical leads.
(2) Set OPERATION switch to C position and RANGE switch to 5.
(3) Press and adjust CALIBRATE SIGNAL control for a full-scale meter indication
and release.
(4) Set SENSITIVITY control, for channel being tested, to obtain full-scale
indication on meter.
(5) Set OPERATION switch to VX1.0.
(6) Adjust calibrator for output of 500 Hz.
(7) Adjust calibrator output level for full-scale indication on TI meter. Calibrator
output will be between 799.7 and 866.3 mV.
(8) Vary autotransformer between 105 and 125 V. The TI indication remains within
2% of full-scale.
(9) Adjust autotransformer to 115 V.
(10) Set calibrator output to minimum.
(11) Set OPERATION switch to VX0.1 and adjust calibrator output for a full-scale
indication on TI meter. Calibrator output will be between 79.97 and 86.63 mV.