Hello, everyone in this forum.
Thank you very much for your usual support.
BTW, I would like to develop an sensor instrument with the piezoelectric accelerometer.
Therefore I've tested with CN0350 and almost the result is OK.
But I guess the background noise is relatively large, that is caused by 60Hz ground
induction common mode noise.
Attached picture is Showa Sokki's charge amplifier model 4050-50 and accelerometer
model 2300A (measured as 5.21pC/m/s2).
And actuator is a Haptic driver that vibrates the model 2300A .
model 4050-50 settings are, PU sense = 5.12pC/Unit, Unit/Volt = 1.
It means if input charge is ±5.21pC, the amplifire outputs ±1V.
This time, the oscilloscope displays approximately ±200ｍVpeak,
then the vibration peak charge probably be ±5.21x0.2 =±1.04pC.(0.2m/s2)
but unfortunately connecting to CN-0350, there appears much 60Hz ground AC noise.
Those common mode noise should be reduced to develop a charge amplifire in house.
The software measurement result without vibration (just noise) is shown below.
This shows amplitude of the noise is about -0.2pC and +0.5pC, relatively large compare to the signal.
I guess the circuit of CN-0350 input would be amended to differential input
to reduce ground induction common mode noise.
Could anyone kindly help me to solve this issue?
Your assistance is Highly appreciated!
Best Regards, Yoshiaki.M.
add some comments regarding background
[edited by: Yoshiaki.M at 11:51 PM (GMT -4) on 19 Jul 2021]