I am trying to simulate AD736 behaviour in multisim. I have used the reference design in the data sheet on page 15 diagram 25 - AD736 with a High Impedance Input Attenuator.
But when i put a 1V PK signal at 50Hz it gives an output of 77.7mV as the RMS value, when actually the RMS value should be around 70.7 mv. This is almost a 10% error margin which is not acceptable.
What could be wrong. Circuit is shown below in the attachment.