IEPE/ICP tachometer for NI9233 or NI9234

[dandrews]

Does anyone know of an IEPE/ICP tachometer for the NI9233 or NI9234 IEPE card? The NI cards are limited to 2mAmps source current.

Or ...   is there a cleaner way to input tachometer signals into the Compact DAQ platform for the Sound and Vibration Measurement Suite?

Thanks! 

[GarPar]

Hi dandrews-

     I will refer you to this discussion forum post as I believe it will address this question.

     Thanks and have a great day!

[dandrews]

I was familiar with that posting and was hoping there may be additional information available. There is a IEPE compatible tachometer from PCB (Lasertach) - but it requires 4 mA of supply current. I had looked at Banner's web page and did not locate anything.

[GarPar]

dandrews-

     You could always provide external excitation to your transducer.  Or, you could use two channels in parallel to get up to the 4 mA excitation.  Just a couple ideas.

     You can also look into our 447X devices (PCI 4472, for example).  They provide up to 4 mA of excitation.

[ulmos]

Yes, 2 channels in parallel works, I've tested that sucessfully with at B&K 2981 - CCLD laser tacho probe.

Just use a BNC T-junction piece, and don't forget to configure the internal IEPE excitation for both channels.

Before doing so, the probe was connected to 1 channel only. It worked sometimes, but not reliably.

After connecting to 2 channels in parallel, it worked reliably, but at the cost of spendin 2 channels 😞

[preston_johnson]

The challenge is the laser tachs need 3 to 4ma of power and the 9233 / 9234 only provide 2ma per  channel. 

The new 9230 and 9232 modules provide 4ma.  These only use one channel, and have a wider input voltage range. 

[kumarb]

Hai,

I am using laser tacho probe type 2981 , connected in NI9234 module , how get Rpm DAQmx 

[JacobJC]

Hi kumarb,

It looks like you are trying to comment on a forum that is over three years old. To get more expedited answers I would try posting your question as a new thread on this forum.

Thanks!