8161 SERIES DIN RAIL AMPLIFIER MANUAL
5
reading previously recorded after dead weight calibration. If the current output is to be
used, repeat the above step using the 20 mA adjust.
6.
If dead weight calibration is not practical and the transducer manufacturer has supplied a
calibration resistor (or resistor value), install the recommended calibration resistor. Now
press the RCAL switch and adjust the voltage and/or current controls until the module
output is equal to the Equivalent Input value simulated by the installed calibration
resistor.
7.
If dead weight calibration is not practical and the transducer-calibration data is unknown,
the Equivalent Input value for the factory-installed calibration resistor can be
approximated as follows, if the mV/V sensitivity rating of the transducer and the bridge
resistance are known.
X = ((25000 x Rb) / (K x Rc))
Where X = Equivalent Input (% of full scale)
Rb = Bridge Resistance (ohms)
K = Transducer sensitivity (mV/V, full scale)
Rc = Calibration Resistance (ohms, 30k installed or proper value
supplied with sensor)
Sample Calculation:
Assume that K = 3.000 mV/V for a 10,000 pound capacity load cell (F.S.) with a bridge
resistance of 350 ohms.
X = ((25,000 x 350) / (3.000 x 30,000)) = 97.22% F.S. = 9,722 lbs.
Summary of Contents for 8161-011A
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