TB 55-4920-329-35
Note. If an out-of-tolerance condition was observed
9. Tachometer.
during the preceding check, annotate DA Form 2416 in
accordance with TM 38-750.
a. Performance Check.
b. Adjustments. No adjustments can be made.
(1)
Set TACH RANGE switch on UUT to 150
RPM
10. Final Procedure.
(2) Open control panel of UUT by removing the
top two screws.
a. Deenergize and disconnect all equipment and
reinstall protective covers of UUT if necessary.
(3) Connect test set, tachometer (Al) to UUT
tachometer.
Note. If no out-of-tolerance condition was noted during
the preceding performance checks, annotate DA Form
(4) Adjust test set (Al) until the indications
2416 in accordance with TM 38-750.
listed in Table 4 are obtained.
b. In accordance with TM 38-750, annotate and
(5) Utilizing TACH ROTATION switch for each
affix DA Label 80 (U. S. Army Calibration System).
reading, the indications observed on the UUT should not
When the UUT cannot be adjusted within tolerance,
exceed the limits specified in Table 4.
annotate and affix DA Form 2417 (Unserviceable Test
Instrument or Standard) (red tag).
Table 4. Tachometer indications
UUT
Range and RPM
Test Set (A1) Indication RPM
indication
Minimum
Maximum
(150)
90
87
93
135
132
138
(1500)
450
420
480
900
870
930
1350
1320
1380
5
