USB-6225 DAQmx measurement problems when using a voltagesplitter

Hi guys

I had a serious problem regarding the use of DAQmx USB-6225. Please look at my diagram below:

When I measure the waveform sine on AI0, everything is OK. Even with a very sampling rate high as 80kS.

When I measure the waveform sine on AI1, everything is OK. Even with a very sampling rate high as 80kS.

When I measure the battery voltage on AI2 CC, everything is OK. Even with a very sampling rate high as 80kS.

Now comes the problem:

If I measure all three analog inputs or the two and two together, I get a very different result when I measured one and a single channel. If I add more channels (i.e AI3 and AI4) on my USB-6225 DAQmx, without connect anything to them, I can see the sinuses even as I do with AI0 AI1, but with less amplitude.

When I measure the voltage as well as AI0 and/or AI1, the domain controller becomes sinus armor as well. If I connect the + 2 V DC directly to data acquisition without resistance, I see a line perfectly DC on my chart, but with the sinus AI3 and AI4 top.

If I use an oscilloscope and measured directly on the same wire that goes to my data acquisition and the resistorcoupling, I can see small pulses of the samplingfrequency and the signal seems quite noisy.

That's my big problem:

Everything works perfectly if I use R<100Kohm. any="" value="" below="" 100k="" is="" ok.="" this="" coupling="" on="" the="" schematic="" is="" just="" a="" test.="" the="" trouble="" comes="" when="" i="" need="" to="" measure="" a="" circuitboard="" that="" draws="" energy="" from="" a="" capacitors="" in="" the="" circuit.="" if="" i="" use="" any="" resistors="" below="" 1megaohm,="" it="" draws="" energy="" from="" the="" circuitboard="" and="" the="" test="" is="" not="">

Anyone with some experience around this problem? The impedance of the analog input on my USB-6225 DAQmx is 10Gigaohm so it should not really been an issue.

Here is what I tried:

With the help of a D - sub cable with shield. I tried to use with no shield shield closed, I have both ends and closed, the shield only on my DAQ.

I checked my code and also just used the DAQ assistant.

I checked all parts off my setup for groundcircuits and I twisted each cable from any power supply, the signalgenerators, the DAQ cables.

I have connected my DAQ to mainsground (in the wallcontact 230V and Yes, we use 230V in Norway). Also any other equipment.

I connected without mainsground. Also any other equipment.

I tried cables as short as possible.

I tried to use the differential, CSR (Respect to GND), NRSE (Respect to the sense of IT). Nothing has worked.

I tried to use as sample rate and samples possible. (It helped a little when the DC measurement and AN analog input. If I tried all three, he has yet again).

All this comes to mind that the USB-6225 DAQmx cannot manage measuring more than resistors with values around 1Megaohm and above.

The answers will be rewarded with congratulations and a sincierly 'Thank You '.

Hi guys again!

Bother replying this thread

I'm a guy. I don't read manuals! But now that I did... And. There are 4 pages describing my problem and what to do about it. So problem solved

I have experience ghostvoltage of the other channels due to the high - impedance of the source. I created a follower of tension with an op-amp and the problem disappeared! Thank you ni.com/info/f/. Do you have answers for everthing is there to inquire. Except why I ran out of beer. mmm beer!

Tags: NI Software

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