Binsfeld TorqueTrak 9000, User Manual, Page: 18 / 35

- 17 -
Example:
Given a solid steel shaft with
D
o
(shaft diameter, measured) = 2.5 inches
GF (gage factor from gage package) = 2.045
G
XMT
(BT9000 gain based on jumpers) = 2000
(755.17 x 10
3
ft-lb/in
3
)(2.50 in)
3
T
FS
= = 2,885 ft-lb
(2.045) (2000)
so 10.0 V output at the RD9000 indicates 2,885 ft-lb of torque or
288.5 ft-lb/volt.
Step 2: Trim the Full Scale Output: If desired, the full scale
output voltage of the RD9000 can be trimmed so that the
voltage output corresponds to an even round number
torque level, e.g. 100 ft-lb/volt. First, calculate the
trimmed voltage value (V
TRIM
) that corresponds to the
round number (trimmed) torque level (T
TRIM
). Note: T
TRIM
must be greater than T
FS
calculated above.
Legend of Terms
T
FS
Full Scale Torque (ft-lb)
T
TRIM
Trimmed Torque (ft-lb)
V
FS
Full Scale Output of System = 10 volts
V
TRIM
Trimmed Output of System
(T
FS
)(V
FS
)
V
TRIM
=
T
TRIM