I am using a MEMS Accelerometer (ADXL1001), along with the EVAL board and an NI 9234 DAQ module to acquire the signal. I am using a RG58 coaxial cable to connect the sensor output (2 connector pins, Vout and Ground on the EVAL board) to the DAQ input (BNC connector).
However, I noticed that there's an interference and I see a small peak at 50 Hz frequency in the FFT of the signal (since the signal cable was lying near to a power amplifier). And on shutting the power amplifier OFF, the peak disappeared (no surprise).
My question is, which type of cable should be used (coaxial, shielded twisted pair or any other?) to achieve the best noise performance and to make sure that there's (almost) no interference.
Some addtional information:
*The sensor measures frequencies up to 20 kHz and the voltage varies from 0 to 5 volts, so the cable should be accordingly. *The DAQ (NI 9234) has a pseudo-differential configuration). (Does that impact the type of cable that can be used?)
Thanks in advance :)