Current minimum for pxi-2529

Hi all! I have the PXI-2529 matrix, and I intend to use it this way: I have a set of magnetoresistifs sensors connected via matrix switches to DVMs (see photo). I need a few times (such as 1 - 100 times a day) to change these connections. Here's the question: one of the parameters of the matrix is common minimum and it is 10uA. I want to understand what is the reason for this setting? (is this leak or something else), and what is that means that the matrix will not work if DVM internal resistance will be large enough, and current jet matrix mixers will be less than 10uA?

Hi store,.

To answer your questions, yes the minimum current is very similar to current humidification, this is the current that is needed to systematically knock the junk of the relay to check that it continues to work properly.  Using switches OR defines the minimum current as "the current minimum" which can flow reliably through the switch  So, while you will probably be able to measure a signal, even if you're not fulfills the minimum requirement, we cannot guarantee behavior of your switch if you operate out of specifications.  If you're running the specification current minumum for long periods of time, the resistance of the relay contacts will increase over time, and your relay will eventually become unusable.  Essentially, by non-compliant to the specification, you will shorten the life of your relay.

As for your question, "is to say that after a few years of this matrix using the conductive oxide become big enough and I'll lose the connection?"  The answer is Yes.

I hope it's a bit more clear, let me know if you still have questions about that though.  Have a good!

Tags: NI Products

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