TB 9-5120-212-24
h. Press the SIGNAL to select the GROSS mode of operation. Press the F4 key
on the force/torque indicator until the Acal soft key is displayed. Press the Acal soft key as
necessary to activate the Acal enunciator.
i. Set TI to 0 with no torque applied.
20. Torque
a. Performance Check
NOTE
To prevent overshoot of desired torque, stop applying pressure
approximately 30 ft-lbs before desired torque. Release crank
momentarily and allow display to catch up. Continue cranking
at slower speed and shorter increments.
NOTE
To reverse ratchet mechanism, crank handle from load (if any)
to no load. Continue cranking while rotating the reversing ring
until the ring freely snaps into proper position.
(1) Exercise TI as follows:
(a) Turn crank handle cw to obtain an approximate full-scale indication on TI.
The force/torque indicator will indicate ccw reaction torque.
(b) After 30 seconds, turn crank handle ccw to obtain a 0 indication on
force/torque indicator.
(c) Repeat (a) and (b) above two times.
(d) Check TI for a 0 indication on TI. Reset if necessary.
(2) Press the F4 key on the force/torque indicator until →0← soft key is displayed.
Press the →0← soft key to zero force/torque indicator.
(3) Operate TI cw to obtain indications listed in table 7. If force/torque indicator
indications are not within limits specified, perform b below. Turn TI crank handle ccw to
remove torque.
NOTE
The calibration points must be approached in the direction of
increasing torque. If calibration point is passed, reduce torque
and approach calibration point again.
Table 7. Calibration Accuracy.
Torque cell indications (ft-lbs)
Test instrument
Min
Max
indications (ft-lbs)
Model ATP 8000
5500
5340
5660
6000
5840
6160