Dear Sir,

Our catalog specifications list the basic accuracy at full scale for the CR5210 to be 1%. This means that at full scale of 5 volts output, the reading could be 4.95 to 5.05 VDC and be considered to be within range.

This same +/- 50 mV is applied throughout the range of the part. This infers directly that it is always desirable to use a transducer as close to full scale as possible.

At zero current flow then, the output would be considered within spec if it was between -50mV and +50mV. From your readings, your worst case is a 10 mV offset, which would represent 0.2% full scale accuracy, and is well within the specifications of the part.

You can have access to the calibration of the unit if this is not satisfactory by removing a small door on the base of the unit and adjusting the trimpots for zero and span.