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Error in the Output and Resolution-ADUCM360

Question asked by SAM_IISc on Nov 22, 2013
Latest reply on Dec 4, 2013 by MMA


I am currently working on an experiment which needs at least 0.1mV to 1mV resolution in the output. I am using the program ADCmeter.

But even though the manual says 1.05microVolts resolution at PGA 1, I am not able to reproduce the same in the output with PGA as 1.

While viewing the output in Hyperterminal, I have made provision to also see the result of "ulADC1Result" i.e ADC output along with the Voltage, and here I see that only first 12 bits from MSB are constant at a particular voltage and the rest 20 bits are constantly changing. According to the manual only the first 6 bits are to be affected by the noise which is clearly not the case in mine.

One more thing I observed was that even though I vary the gain ADCMDE_PGA_G1 from 1 to 4, there is no effect on the output.

Why is that ?