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From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
03-02-2018 01:14 AM
What is the input impedance of the Vch measurement amplifier?
I am interested in measuring a very high (100M-ohm+) resistance full bridge and I'm concerned a typical 1M-ohm input impedance will load the bridge but I can't find the specification in the documentation anywhere.
03-05-2018 09:14 AM
From what I can see, NI does not specify the input resistance of the 4331.
What Voltage range are these measurements going to be in?
03-06-2018 05:11 PM
I prefer the lowest voltage, so that my digitizer resolution is as high as possible. But one thing I saw which I thought was odd was the Vex "minimum current" at 29mA, which suggested my resistances are too high to work anyway...
03-07-2018 09:08 AM
What resistance values are you using? Do you already have a 4331 on hand you are looking to use, or are you spec'ing a system?
03-07-2018 06:03 PM
I'm intending to use 1M-ohm resistances. And I have ordered a system, but may need to return it if it is not suitable.
03-08-2018 11:22 AM
I think this question would be better answered by a service request. Could you create one from your online account or call in so we can work a bit more efficently?