NI acquisition card NI USB - 6001
51 mv, measured in the multimeter, sensor signal basically stable won't beat
This is to use the time domain data acquisition card collection, zero drift is a little big
Excuse me, this is what reason, is the problem that sensor or acquisition card?
CodePudding user response:
Multimeter has integral stability wave (capacitance), so small fluctuations, the original poster can try to change the sampling rate is small, such as 10 hz to see the effect,CodePudding user response:
Get a oscilloscope to see the most intuitive,CodePudding user response:
Multimeter shows the RMS, the sampling rate is not enough, if number of card of the sampling rate is taken enough, it is close to the actual waveform, in oscilloscope measurement should also is this kind of large noise waveform, if want to reduce, I personally think that the best from the sensor front as well as the transmission channel anti-interference laid hands on him, still hope the great god are correct if wrong,CodePudding user response:
Is sensor output analog or digital quantity, if the digital measurement this is meaningless, if it is analog, that depends on the accuracy of the sensor