SC-2043-SG precision

Hi, I would be very gratefull if someone could help me with this.

I'm figuring the precision expected of a system that is made of executed module SC-2043-SG and card acquisition of data NI PCI-6281. This system measures the small voltages (0 to 10 mV). When I calculate precision for module packaging signal according to the instructions given for CSC-SG0x (available at www.ni.com), then a substantial amount of inaccuracy comes from linearity. Manual user linearity corresponds to 0.01% of full scale (FS), which is +-1V, so the contribution of linearity should be 100 uV (which is roughly compared to the measured signal). Given that the input signal is only 1/100 of FS is possible to lower the contribution of the linearity of the packaging to the precision of the measurements? Is - this linearity is static or dynamic? How do you determine this setting?

Is it possible to measure output voltage input and determine the gain on part of the FS and use a function to transfer instead of gain of 10.

Thank you

Dalibor

Dalibor salvation,

The error of the non-linearity is the factor that is included in the calculations of precision to compensate for support, during calibration, the transfer of an instrument function is linear, whereas in fact, it looks more like a second or third order polynomial.  The nonlinearity is applied to the full scale reading is because the maximum nonlinearity can occur at any point in the complete measuring range. I guess it is possible to determine the actual transfer of the signal conditioning module function, but it would take to have a highly precise measuring device, the input signal and the output signal of the signal module packaging and by setting the output to the input of measurement report.  With respect to the gain, it is a fixed gain that is applied to each channel and cannot be mitigated.

The information that I used in the drafting of this response comes from an NI Developer Zone article entitled ' understanding Instrument specifications - how to make sense of the Jargon. " I invite you to read the section on non-linearity and see if you can get any sense more than I did.

Best wishes

Wallace F.

Tags: NI Hardware

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