[Noise in the Analog Input Signal - MCC DAQ USB-205]

Hello @Fausto

Thanks for your response. 

While debugging, I am using both the DAQs with single-ended connections (not differential). In general, I understand that a 14 bit A/D has a better resolution than a 12 bit A/D. Would that also affect the base noise and the spike that I am noticing?

The signal is coming from an output box attached to a universal load frame. It is actually a force signal (50kN full scale of 10V) from a load cell.

I am using a PC.

The signal is grounded. 

There are pumps and motors in the lab but not in close proximity to the DAQ or the BNC cable.

I have tried attaching the DAQ to another machine, at a different location in the lab, with a different signal source, and I am noticing the same behavior. 

Please advise.

Thanks

Akshat 

      

[Noise in the Analog Input Signal - MCC DAQ USB-205]

Hello,

I am using a MCC DAQ USB-205 to capture an analog voltage (-10 to 10V). The general noise level observed in the signal is 0.01 V, but I am noticing a sudden spike (0.05 Volt) in the signal every 4-5 seconds (Screenshot attached).

I have tried the following:

1. Tried changing the AI channel connection from AI0 to AI2. Result: Same behavior was noticed. 

2. Tried replacing the MCC DAQ with a new DAQ of the same model. Result: Same behavior was noticed. Please see the attached screenshots for the two DAQ signals.

 

3. The signal was split from the source into two parts and captured simultaneously with a NI DAQ USB-6001. The NI DAQ is showing a much smoother signal with no spiked. 

 

What could be the cause of this problem and how to resolve it? Please advise.

 

Thanks

Akshat