channel-to-channel isolation for the NI9205/9206 differential configuration mode

As indicated in the data sheet of NI9206

/*****************************************************************

Maximum voltage

Connect only the tensions that are within the following limits.

HAVE to COM, PFI0 com and DO COM... ±30 VDC

Isolation voltage

Track-to-track... None

Track-to-Earth

con category I

U.S. (UL 61010 - 1)... 600 VDC, soul

**********************************************************************************/

I don't know if I get this right.

COM actually refers to the common ground for MUX, PGIA and Front end ADC. COM to the Earth is 600VDC max. Any to use differential or CSR or NRSE configuration, HAVE to COM must be ±30 VDC. For example, COM is connected to 400VDC referenced to the Earth. Using a differential configuration, (AI0 +, AI0) - can mearsure between ±5 VDC (scale) in the range of 370VDC to 430VDC (decided by COM = 400VDC). It is also the same for the other pairs of differential input (AI1 +, AI1)-... (AI7 + AI7-).

If so, it also means that I can not using a NI9206 to measure the ±5 VDC(scale range) and 95VDC-105VDC(scale range).

Thanks a lot for your help.

Concerning

Bing

You are right, if COM is 400 VDC, then none of the entries may be outside 380VDC to 430 VDC.  Thus, ±5VDC of measure will damage the module.  To do something like that, you'll need a channel-to-channel isolated module.

Kind regards

Tags: NI Hardware

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