How to adjust the linearity of a capacitive transformer?
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How to adjust the linearity of a capacitive transformer?
The verification or calibration of pressure (differential pressure) transmitters is carried out in accordance with JJG 882-2004 \"Specifications for the Verification of Pressure Transmitters\", while temperature transmitters are calibrated in accordance with JJF 1183-2007 \"Specifications for the Calibration of Temperature Transmitters\". The linearity of the transmitter is usually already adjusted by the manufacturer, and no adjustment is generally required on-site. If the linearity becomes poor, follow the procedures and specifications to connect the standard instruments; apply a 50% standard signal to the transmitter’s input terminal – at this point, the transmitter’s output should be 12mA. If it isn’t, adjust the transmitter’s linear potentiometer so that the output reaches 12mA. This is linear calibration.
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It might be a capacitive transmitter. You can first adjust the zero point and range, then check the linearity across other ranges. Identify the points where the errors are greatest, adjust the relevant potentiometers accordingly, then check again the changes in the zero point and range, making further adjustments as needed until the errors fall within the acceptable range.
Multi-point calibration is required; equipment is needed