TB 9-6625-1943-24
(6) Set calibrator amplitude to 120 V and repeat technique of (3) above using
indications listed in table 3.
Table 3. Frequency Accuracy
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.
Table 4. Frequency Accuracy
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
b. Adjustments. Refer to paragraph 6 c above.
9. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.