How to make accurate measurements at high impedance using NI USB DAQ 6343 in Labview

Hello.  I use a DAQ 6343 for measurement of analog voltage on a signal of high impedance.  I am aware that low impedance is recommended, but it is what is on my Board.  I tried to measure several times to an A/D channel only, increasing the number of samples, sample rate reduction, and I find significant variations in all of the measures.

I wonder what is the best way to stabilize the A/D before taking a step on the way to analog input?

Thanks in advance for your help.

Jodi

Hi jschwatz100,

Here is a good link on ghost image, which talks about solutions for playback of a signal from a high impedance source:

http://digital.NI.com/public.nsf/allkb/73CB0FB296814E2286256FFD00028DDF?OpenDocument

I would recommend a circuit follower of simple tension of construction as a buffer between your signal source and data acquisition. Here is a Wikipedia article about it:

http://en.Wikipedia.org/wiki/Buffer_amplifier

I also recommend to maintain a ratio of 10:1 for your sample rate: Buffer Size(N Samples in Continuous Mode) and lowering/raising them both the same way.

DylanC

Tags: NI Hardware

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