Sorry for the naive question, but it is my first time designing the acquisition of a sensor.
I would like to ask what is the proper hw for the excitation and signal conditioning of the sensor Wilcoxon Amphenol 997-M4, whose spec (997-M4 high frequency accelerometer with integral cable (wilcoxon.com) states "bias voltage output: 12 VDC"- Does the NI-9250 (+- 5V) properly handle the signal conditioning? What should I look at to check for the right compatibility?
both unit support IEPE,
if you only need a range up to 500g the 9250 is fine and has a higher speced stability and lower noise.. (but you dominant noise source is the sensor 😉 )
if you go for high amplitudes at high frequencies and/or longer (20m + ) cables the 9232 with its higher drive current (4mA vs 2mA) seems a better choice.
or if you want to measure down to (or below) 0.5 Hz the 9232 has a lower high pass , however your sensor is speced with 0.5 (-3db) as well as the 9250, so no real problem.
Thank you for the the technical aspects mentioned.
As far as I understood, considering the mentioned sensor, its sensitivity is 10mV/g with a peak full-scale of 600g. In other words it outputs +-6 VDC (the 12VDC Bias Voltage Output mentioned in the spec).
Your rationale is that with a module whose voltage maps to +-5V satures the acceleration between 500-600g. So if they are not needed, that is not a problem, otherwise I would need the 9232.
The other rationale is about the excitation current, this depends on the cable distance and EM noise as far as I understood. In other words, if the setup is confined the 2mA excitation current should be enough.
The rationale about low and high frequencies are new and appreciated. I will investigate them.
What about the general AI 9025 module. What is it missing w.r.t the excitation and signal conditioning of the dedicated modules? What kind of HW should I integrate and how? Are there any experiences of past users I can look at?