PCI 6033 Analog measurement noise

[auerdoan]

I want to make sure I'm doing all I can to get the best measurement possible Im using a SCB 100; I'm using a PCI 6033 card. I've connected my analog wires Looking at a chart labeled I/O connector for 64 channel E series Devices.. I see for ground a choice AI GND, AI SENSE, AI SENSE 2, EXT REF, AO GND, D GND. I used the AI GND. my measurement is close but there is some noise 4.30 milliamp is expected I'm getting 4.80 on some units  in Measurement and Automation I've set it up for ref single ended and a -10 to 10 vdc measurement I connected a wire from the AI GND to my units I measure power supply ground the wire is short less than 10 inches, 16 gauge. Am I using the correct ground?. Thanks-Kurt this post is also in the Labview forum i think it belongs here.

Kudos! Thanks!

[ColeTrain · Accepted solution]

Hello Kurt,

You're specifying the range to be ±10V which gives the lowest amount of accuracy.  Depending on what voltage range you're actually reading, you can specify a smaller range to get better accuracy.  Depending on the factors of your setup, there will be other considerations to take into account.  A great resource for optomizing your setup is this DevZone. 

[auerdoan]

Thanks for the advice ive found bits of that link in another post and am now using this method

Nice to see the info i have as a whole and not broken

 a great referance.

again thanks for the link

-Kurt