TB 9-6680-287-35
Manufacturer and model
Common name
Minimum use specifications
(part number)
Range: 250 to 10,000 RPM
Ideal Aerosmith, Model 1790
CALIBRATOR
Accuracy: 0.5%
1
1Limited
deployed.
6. Preliminary Instructions
process. Personnel should become familiar with the entire bulletin before beginning the
calibration.
b. Items of equipment used in this procedure are referenced within the text by common
name as listed in table 2.
c. Unless otherwise specified, verify the result of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in the manufacturer's manual for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
WARNING
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable.
a. Connect test equipment to appropriate power source, apply power, and allow
warm-up as required by the manufacturer.
b. Mechanically zero TI pointer, if applicable.
8. RPM Accuracy
a. Performance Check
(1) Set TI RANGE switch to LO.
(2) Select a minimum of four evenly spaced calibration speeds over the TI range
being calibrated, up to 90% of full TI range.
(3) Select tachometer calibrator CW direction and ensure the STOP control is activated.
