Read a bit off in differential mode in NI 9205

I have an LVDT connected in differential mode in NI 9205 tends in NOR cDAQ 9172. The output signal full scale is from-10 to + 10 VDC VDC. The excitation voltage is +-15VDC. I placed the LVDT to read mVDC - 1400 on the digital multimeter (DMM), well, it oscillates between 1399 mVDC and mVDC-1400. When I read that in Labview 8.5, reading is about-1.410 VDC, oscillates between - 1.407 VDC and - 1.414 VDC.  I know an offset of 10 mVDC isn't that much when my output full scale is 09:50 VDC and I'm not losing my sleep on. But I just wanted to know if it was normal.

The output LVDT signal is referenced (-terminal of excitement and - terminal of the output signal are linked, it is necessary) and I plugged this thread of land on the port COM of NI 9205.

I also have a sensor with floating floor whose output is 0-100 mVDC. I have it connected in differential mode too the + and - output terminals are connected to the ground/COM port using 100 k ohm bias registers. In this case, it is without lag at all. The DMM and Labview show the same reading. By the way I am at the same time by displaying the readings in Labview and DMM.

Hi sharmaa -.

You can find your shift error using pages 23 and 24 of the NI 9205 manual Instructions and specifications.  10 mV seems a bit high for this particular card, but as you say, 0.1% isn't so bad.  I would say that you have the right not to lose sleep on.

Have a great weekend!

Tags: NI Hardware

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