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pxi 4070 protection

Hello,

 

I have a PXI 4070 DMM card, and I set the voltage measurement range to 1V. What happens, if the input gets 15V? Will the card be damaged, or is there any protection against higher voltages?

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Normaly the card will be having Fuse so the input to the card will be passing through that so if any high voltage or a surge is comming the fuse will open and thus the card will be safe. Read the hardware manual for the ranges.

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The best solution is the one you find it by yourself
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The PXI 4070 does have input protection that is designed to protect the device from overload conditions. In the NI Digital Multimeters Help there is a section called Handling High DC Voltages which says that the input protection will engage when the signal exceeds about 15V when on the 10V range or lower for the PXI-4070. The behavior is that the input will change and look like a constant current. 

 

The input protection circuit will protect your board from damage however I would not recommend designing a test that would rely on this if you can avoid it. It will not damage the PXI 4070 but it will take a little time to recover from this overload state before you can continue to make low voltage measurements. There is a caution about regularly relying on the protection circuit if you have a switch in your system because there will be current transients that can degrade the lifetime of your switch. 

Steve B

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