CDI Torque SURETEST Torque Calibration System - Manual (Page 21)

FUNCTIONAL DESCRIPTIONS AND SPECIFICATIONS CHAPTER 2
SURETEST Transducers
SURETEST transducers provide industry standard square drives. They feature a full
bridge strain-gauge @ 350 Ohms nominal. Full range output is 1500 uE, 9mV
(3mV/V @ 3.0V excitation).
Torque transducers use a built-in EEPROM memory chip that stores range identification
and calibration factors. Calibration of transducers is accomplished using precision torque
bars and certified weights. For additional information, refer to Chapter 5—Calibration.
After a transducer is calibrated, it provides ±0.5% system accuracy with any SURETEST
System. If the transducer and SURETEST are calibrated together, the system accuracy
increases to ±0.25%.
Transducer Dimensions/Transducer Torque Range
Calibration also results in a specified display resolution on the SURETEST. Display
resolution is dependent on the type of transducer being used. The following table shows
display resolutions for the specified transducer with the force arm.
Display Resolution for Transducers
SURETEST torque transducers can withstand an overload of 110% of full range. The
SURETEST alarms, (audible beep and display "OVER" ) at 110% of rated capacity.
To protect the tool under test or to serve as a fastener installation torque preset alert, the
SURETEST produces a constant audible tone when the input torque exceeds the SET
LOW limit. It then produces a pulsating tone when the input torque exceeds the SET
HIGH limit.
The SURETEST Indicator ignores inputs less than 0.1% of full range in TRACK mode,
2% in PEAK HOLD mode, 7% in FIRST PEAK and POWER TOOL modes.
With the 4-in-1 transducer, the SURETEST System ignores inputs less than 2% of full
range after scan select.