Measuring higher than 300Vrms

[TarunT]

Hi.

We're looking for possible solutions to measuring voltages higher than 300VAC rms (closer to 350VAC rms) using the 9225 cRIO module (or even one of the +/-10V analog modules). 

Our application is fairly space constrained so traditional use of PTs/etc may not be suitable. 

We also need the solution to have fairly decent frequency response to about 10kHz.  Would anyone have any off-the-shelf solutions or suggestions?

[johnsold]

If the 600 V channel to channel isolation of the NI 9225 is sufficient for your application, you might consider a 2:1 voltage divider in front of the NI 9225.  This would certainly be the simplest approach.  That would make the input range 600 V.  If necessary a voltage clamping device rated at 300 V could be added to protect the input module.

If you need more isolation, you will need to look at other techniques.

Lynn

[TarunT]

Hi Lynn.

We're really looking for a ready made/off the shelf solution to avoid any certification issues/etc. 

[johnsold]

I cannot help there.  I am not familiar with what might be available with certification.

Lynn

[K C]

Maybe an interface module like the 2811103 MCR-VAC-UI-O-DC from Phoenix contact is a solution. Not the frequency response you want but it is a start.

There are more manufacturers that produce interface module like this one.

Kees