Im using NI DAQ USB 6008 datalogger. When I connect A0 (or 1,2 etc..) to ground in single-ended mode it gives 6 mV. Shouldn't it be 0 mV? Is it corrupted or normal?
USB datalogger ground read isn’t zero volts
dataloggergroundvoltage
Related Topic
- Electronic – arduino – Floating supply and USB ground
- Electrical – Faulty mechanical keyboard: Identifying “defective” ground connection on PCB
- Electronic – Some issues modeling a “two terminal source” coupled to a differential amplifier in LTspice
- Electronic – Why is a current signal preferred to a voltage signal for long analog transmission
Best Answer
Inputs on these are typically covering a +/-10V range and as you may be using a 12 bit input ADC, the resolution will be 20 volts/4096 = 4.88mV.
Given that this is resolution only, accuracy could be double this error quite easily.
In fact on further reading of the data sheet I suspect that the input resolution (single-ended) is only 11 bits. See this - click on data sheet link then click on detailed data sheet link.