TB 9-6625-1878-40
(2) Set TI dials to 0.900000 (Gertsch, Models RT2 and TF515/U (RT60) only have
five dials) and set decade transformer to 0.9000000.
(3) Adjust decade transformer and phase compensator for best null on null detector.
Decade transformer will indicate between 0.8999900 and 0.9000100.
NOTE
Refer to decade transformer calibration test report for
corrections.
(4) Repeat technique of (2) and (3) above for each setting listed in table 4. Decade
transformer indication will be within limits specified.
(5) Repeat technique of (1) through (4) above with oscillator set at 50 Hz.
b. Adjustments. No adjustments can be made.
Table 4. Ratio Accuracy'1
Test instrument settings
Min
Max
0.800000
0.7999910
0.8000090
0.700000
0.6999920
0.7000080
0.600000
0.5999930
0.6000070
0.500000
0.4999940
0.5000060
0.400000
0.3999950
0.4000050
0.300000
0.2999960
0.5000040
0.200000
0.1999970
0.2000030
0.100000
0.0999980
0.1000020
0.090000
0.0899981
0.0900019
0.080000
0.0799982
0.0800018
0.070000
0.0699983
0.0700017
0.060000
0.0599984
0.0600016
0.050000
0.0499985
0.0500015
0.040000
0.0399986
0.0400014
0.030000
0.0299987
0.0300013
0.020000
0.0199988
0.0200012
0.010000
0.0099989
0.0100011
0.111111
(0.11111)
0.1111089 (0.1111079)
0.1111131 (0.1111121)
0.222222
(0.22222)
0.2222188 (0.2222168)
0.2222252 (0.2222232)
0.333333
(0.33333)
0.3333287 (0.3333257)
0.3333373 (0.3333343)
0.444444
(0.44444)
0.4444386 (0.4444346)
0.4444494 (0.4444454)
0.555555
(0.55555)
0.5555484 (0.5555434)
0.5555616 (0.5555566)
0.666666
0(.66666)
0.6666583 (0.6666523)
0.6666737 (0.6666677)
0.777777
(0.77777)
0.7777682 (0.7777612)
0.7777858 (0.7777788)
0.888888
(0.88888)
0.8888781 (0.8888701)
0.8888979 (0.8888899)
0.999999
(0.99999)
0.9999880 (0.9999790)
1.0000100 (1.0000010)
'Settings and indications in parenthesis are for Gertsch, Models RT2 and TF51 51U (RT60).
10. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.