Measure offset and gain error of ADC

[Valentin87]

HI.

I have an array of data from ADC (sinusoidal signal was applied to the input). Is it possible to calculate offset and gain error from this array? Thanks.

[wiebe@CARYA]

Yes, that is possible. Providing you have the original input level of course, or you'll only get an amplitude, not a gain.

Details will vary depending on the exact requirements.

I'd use a (PtByPt) FFT. That would give you a DC (at 0 Hz) and a peak at the sinus frequency representing the gain. There are probably specialized tone analysis VIs as well...

[Valentin87]

I don't think that FFT is need to use. Most likely should be used mathematics.

[wiebe@CARYA]

---

@Valentin87 wrote:

I don't think that FFT is need to use. Most likely should be used mathematics.

---

Isn't FFT mathematics?

It's not about 'need' to use, for me it would be the easiest and most intuitive way to make it.

[Valentin87]

So how from FFT get this parameters if all data in FFT is dB?

[wiebe@CARYA]

FFT PtByPt.vi doesn't return dBs...