TB 9-6695-301-50
Table 3. Torque Calibration Chart - Continued
Tolerance range
Test
Actual
instrument
Torque
Weight
weight1
Calculated2
Min
Max
range
calibrator
(lbs)
(lbs)
torque
(-0.5%)
(+0.5%)
lbs
Model
0 to 1000 ft-lb
STPI
60
(40-IN.
120
radius)
180
240
Full scale
300
1Actual
weight = Mass (in pounds) x G/980.665. Where: G is local gravity and 980.665 cm/sec2 is standard
gravity.
2Calculated torque (T) = Actual Length x Actual Weight
e. Install torque cell holding fixture on a sturdy work bench and secure with bolts.
pointing in an approximately 7 o'clock position (5 o'clock for ccw torque). Connect TI
indicator to torque cell and to 115 V ac power source. Turn power switch to on and allow 30
minutes for unit to warm up.
NOTE
It is important that cell be installed in this way to ensure that
the torque cell is calibrated in the same orientation that it is be
used.
supplied with kit
NOTE
Position of arm must be such that load cable hangs from
circular portion of arm; in case of 40 in. arm, proper position is
from near horizontal to about 10 degrees upward slope.
h. Press the CHANNEL +and keys to select channel 3.
i. Press the F4 key on the TI indicator until you see the
soft keys. Press the
soft keys as necessary to select the torque cell entry for the TI and direction being
calibrated.
j
Press the SIGNAL
to select the GROSS mode of operation. Press the F4
key on the TI indicator until you see the Acal soft key. Press the Acal soft key as
necessary to activate the Acal enunciator.
k. Press the F4 key on the TI indicator until you see the UNIT soft key. Press the
UNIT soft key as necessary to select the appropriate units to display.
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