CF 52A
5
Mar 2014
Chapter 3 - Calibration
3.1 Calibration
The following calibration process is used to fully calibrate the DCM 495 with the transducer being used.
Connect the DCM 495 to the transducer observing the wiring codes as explained in Chapter 2. Apply
power and allow the unit to stabilize for 10-15 minutes before starting the calibration process.
ZERO ADJUSTMENT: With no load or pressure on the transducer and using the ZERO potentiometers,
adjust the output on the readout instrument to Zero.
SPAN ADJUSTMENT: Load the transducer to its full scale and using the SPAN potentiometer, adjust the
span to indicate the full scale reading on the readout instrument.
Repeat this process to ensure that calibration is completed.
3.2 Using Shunt Calibration
The Cooper DCM 495 features shunt calibration. This calibration method simulates an output from the
transducer as if a load or pressure is being applied to it. This is accomplished by placing a known resistance
across one leg of the Wheatstone bridge. When performing shunt calibration, the transducer should be at
ZERO pressure or load (in other words, no physical load or pressure is to be applied to the transducer).
The full scale output and shunt cal output is found on the TRANSDUCER CALIBRATION SHEET. This
information can be
used to calibrate the amplifier’s output voltage and the readout’s display with the
following equations:
The following formulas are used to calculate output voltage and display units: