9234

[sandy.qiu]

i want to sample two different type signals simultaneously: one is impact force(from PCB hammer 086C03) and the other is velocity from laser vibrometer (analog output,+-4V, output impedence 50ohm), what kind of DAQ device should I use?

[Kurt_Veggeberg]

The NI 9234 or USB-4431 would be a good choice    It can supply the current excitation to the PCB impact hammer 086C03 if you enable ICP on one channel.    On the other channel you can turn off ICP for the laser vibrometer.      Their are some advanced impact test projects in the Sound and Vibration Measurement Suite and Toolkit that you could use.    In addition to VIs for calibration, FRF and vibration levels, it includes some basic and advanced projects for impact testing (NISV Advanced Impact Test).     You would change the accelerometer in the examples to the laser vibrometer. 

[sandy.qiu]

Thanks for your reply! If I use usb-9234 as the DAQ device, (1) Do I still need other device between the hammer and USB-9234 (or between the vibrometer and USB-9234), OR connect the hammer directly to USB-9234? (2). from usb-9234's specification, there is a analog prefilter, I want to know does it have the same passband frequency for all sampling frequency? (3) can you post a detailed circuitry of USB-9234 (including the filter and digital processing module)

[Kurt_Veggeberg]

You typically connect the hammer directly to the USB-9234.   Most modal impact hammers are ICP/IEPE devices.

[sandy.qiu]

thank you~