offset data conditioning card: The function of offset data conditioning card is to clamp the given AC signal with respect to a reference DC voltage. The reference DC voltage is preset
according to the components used in the circuit which intern depends on the maximum load rating. The circuit diagram of the offset data conditioning card is as shown. It consists of two op-amps, UA714CN which are operated in invert mode. The first op-amp is used as a summing amplifier. It adds up the input signal with the DC reference voltage.
The output of the first op-amp is inverted using the second op-amp which acts as an inverting amplifier. The output of this op-amp is taken out as the output of the offset data conditioning card