Problem with Using 2 Analog Inputs of AD7710

Question

Hello, I am Using a single AD7710, to have an accurate Voltmeter and Ammeter. 
 AIN1 is for Voltmeter and AIN2 for Ammeter. 
 AD7710 is in 16 bit,Bipolar mode, Gain=1. 
 Vbios=AGND=0V, AVDD=5 V, VSS=-5 V, REF(+)-REF(-)=2.56 V, DGND=0v, DVdd=5V 
 1- Should I Connect DGND to AGND? 
 
 And 2 AD7710 analog inputs here: 
 
 The Problem is Shown In the Following Pic: 
 
 2-As shown in above table, in test 3, where I use both AIN2 and AIN1 simultaneously, output data in AD7710 and also commercial Voltmeter shows wrong values!! please Help! 
 for testing I am using the following Variable Current and Voltage Source:

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Problem with Using 2 Analog Inputs of AD7710