TB 9-6625-2188-24
Example:
-127.9
-106.38
21.52 = difference value
(16) Locate difference value (21.52) in table 7 and determine corresponding additive
factor (0.00). Algebraically add additive factor to resulting number of (14) above. The
result is in THD.
Example:
-106.38
0.00
-106.38 = THD
The calculated THD in (16) above will be -102 dB.
(17) Repeat technique of (3) through (16) above for TI and notch filter settings listed
in table 8. THD will be within limits specified.
Table 8. Total Harmonic Distortion Accuracy.
Test instrument settings
Notch filter settings
Calculated THD
(kHz)
(kHz)
(dB)
1
1
<-102
50
50
<-95
100
100
<-90 (<85)
b. Adjustments. No adjustments can be made.
11. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.
9/(10 Blank)
