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Our
load cells and torque sensors are supplied with at lease a one direction calibration
certificate traceable to the NIST. Dead weights and transfer standards and all
measurement equipment used to calibrate our products are certified on a regular
schedule.
Calibration Procedure
Four
load points are recorded from zero to full scale increasing and decreasing with
the errors documented as linearity and hysteresis as percent of full scale. This
procedure is repeated and the difference between runs documented as repeatability
error as percent of full scale. Finally, with the load cell or torque sensor at
zero (NO LOAD) position, a precision wire wound resistor is placed across (-)
power lead (black) and (-) signal lead (white) producing a millivolt output. Our
calibration certificate will reflect this resistor value and millivolt output
along with calculated percent of full scale and engineering units to be used later
for system calibration.
System Calibration
Our
load cell and torque sensor related instrumentation (with or without display)
utilize the resistance (R-CAL) method of calibration transfer. The precision resistor
value stated on our calibration certificate and explained above is supplied with
our instrumentation as a internal or external (R-CAL) resistor. A push button
or momentary switch shunts the load cell bridge, and the span pot is quickly and
accurately adjusted to the engineering units equivalent stated on the calibration
certificate. | |
Call For Applications Assistance (800) 344-3965
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