NI-6703 analog output commom voltage

[McArthur]

I am using NI-6703 and SCB-68 connector box. Now I am wonderring, what is the maximum common voltage the analog output can bear?

In my application, if the our transistor broken, 50 V will be added to the board. Is that OK for the board?

I am waiting for your answer on line....

[Dan_K]

Hello McArthur,

The Maximum working voltage of the NI-6703, from the NI 6703/6704 Specifications, Page 2 is 11 V from Channel to Earth.

If 50 V is applied to this board it will permanently damage your device.

[McArthur]

Hello,

Thanks for your answer, but this 11V refers to earth, I want to know the maximum voltage I can add to the AO0 and AGND , Can I add 50V, my 50V is not connected to the earth.

[Dan_K]

Hello McArthur,

This 11 V refers to the maximum potential difference between the ground of the card (which is connected to earth ground through the PC and the power outlet) and a voltage placed on the analog output card. If a potential difference between earth ground (approximately AOGND) and AO0 exists greater than 11 V you risk damage to your card. A potential difference of 50 V guarantees the destruction of your device.

[Seth_B.]

Hello McArthur,

Dan_K is correct.  Because the 6703 is not an isolated device, the ground lines are tied to your computers ground, which is tied to earth ground through the power supply.  The term "Earth Ground" in our manuals refers to the ground of the chassis your device is connected to.  A 50V difference between AO0 and AGND will destroy the device and is not safe.

Regards,