ADC-24 gain error stability and possibility to calibrate out

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JohnBriant
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ADC-24 gain error stability and possibility to calibrate out

Post by JohnBriant »

The spec sheets for the ADC-24 state a gain error of 0.1%. I want to understand more about this, so that I know the limits of the logger.

Specifically, three questions:
1. How stable is the gain error over time and reasonable room temperature variations - so I know how much of the error I can calibrate it away? If there is little or no drift with time and temperature, I am happy.
2. Is the remaining fluctuation in gain correlated from one channel to the next, so that by monitoring the gain of one channel I can correct the gain variation in the other channels (e.g. by connecting up some highly stable resistors)? (I am already doing this to correct for variation in the lab PSU voltage...)
a. Such a correlation might arise from all the channels being multiplexed into one amplifier; or all the amplifiers being the same temperature (because of being on a single, multichannel amplifier chip).. e.g. if they were in groups of 4 amps per chip, if I knew which inputs shared a chip, I could monitor the gain drift for each chip.

Thanks,

John
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