10-26-2011 08:07 AM
Good day all,
Kindly assist on this. I have a PCI 6221 and a connector block BNC 2110. I am using a PCB accelerometer to acquire signal from a modeled building with the aim of getting the frequency components from the time response after exciting the building at a specific constant frequency. The problem is I kept noticing that I cannot select acceleration with PCI 6221 so I selected voltage in DAQ. The time response seems okay but the FFT is totally not worth it. I presume I should get my specific frequency back since this if forced excitation but this is not happening.
My question are
1) Since PCB accelerometer are supposed to be given a little voltage of 4A to get them started, can I use PCI-6221 the way I am using it and still acquired signal from my building which can be presumed normal.(I mean okay)
2) Is it right for me to select voltage in DAQ instead of accelerometer using PCB accelerometer when the aim is to acquire acceleration values or let me put it this way :if I cannot get a card that can read acceleration can I still used the voltage in DAQ since the PCB ICP accelerometer gives out voltage values. Please which is the right way.
Thanks all.
10-30-2011 08:25 PM
Hi Osmosis,
to measure acceleration using 6221 and PCB accelerometer, you need signal conditioner (480C02 from PCB) to
power sensor and decouple sensor DC offset (around 10V). You can use voltage task and scale readout according
to your accelerometer sensitivity (for instance 100mV/g). Another way is to use one of DSA cards. Consider
USB 9234 for direct connection to PCB accelerometer and measurement using acceleration task.
Damir
Niksis d.o.o.
PCB Slovenia