TB 9-6625-1943-35
a. Performance Check
(1) Connect calibrator OUTPUT HI and LO to TI 400 Hz input.
(2) Set calibrator for a 120 V, 400 Hz output.
(3) Adjust calibrator frequency for a 400 Hz indication on TI.
Calibrator
frequency indication will be between 0.3996 and 0.4004 kHz.
(4) Set calibrator amplitude to 105 V and repeat (3).
(5) Set calibrator amplitude to 135 V and repeat (3).
(6) Set calibrator amplitude to 120 V and repeat technique of (3) above using
Calibrator frequency
Test instrument
indications
indications
(kHz)
(Hz)
Min
Max
380
0.3792
0.3808
385
0.3842
0.3858
390
0.3892
0.3908
395
0.3942
0.3958
405
0.4042
0.4058
410
0.4092
0.4108
415
0.4142
0.4158
420
0.4192
0.4208
(7) Disconnect calibrator OUTPUT HI and LO from TI 400 Hz input.
(8) Connect calibrator OUTPUT HI and LO to TI 60 Hz input.
(9) Set calibrator for a 120 V, 60 Hz output.
(10) Adjust calibrator frequency for a 60 Hz indication on TI. Calibrator frequency
indication will be between 59.94 Hz and 60.06 Hz.
(11) Repeat technique of (10) above using indications listed in table 4.
Test instrument
Calibrator frequency indications
meter indications
(Hz)
(Hz)
Min
Max
58
57.88
58.12
59
58.88
59.12
61
60.88
61.12
62
61.88
62.12