6035-E high frequency noise reduces the resolution of 14 bits.

Dear Technical Support Group OR and MF DAQ,

I don't get the complete 16-bit on my DAQ 6035 - E cards and 6034-E resolution because of the high frequency noise.
The Test Panel and the actual catches show 1.2 mV peak-to-peak noise with entries is is failed the GA right input in differential ended mode and single connector - Test Panel screen grab and connector attached picture.
With a range of +-10V, noise LSB + half expected specified in the manual should be only 305 microvolts (20/65536) which is four times less than what I see.
So far, I've been scanning (a channel) to ten times (60 KHz) the rate I need (6 KHz), then SavGol the filtering and sampling downstairs.
The problem is that I need to sweep the four channels that now exceeds the capacity of 200 KHz of the card and also results in huge quantities of useless data.

Have considered buying a new USB DAQ with better record, I fear that all products OR suffer the same flaws and gave the purchase.

Please, share your ideas.

Thank you.

GPSman salvation,

Looking at your control panel test plot, it would seem that there is a discrete steps on your axis is between - 0.0019 and - 0.0012 or 700 µV.  Then you can see that there is about a little more than 2 discrete steps to your signal, which brings value to about 300 microvolts, exactly as the resolution makes clear.

You can also find that there is a specification of noise and precision in specification.  You can find for a single point, the accuracy in the +/-10V between 1,085 millivolt.  This is on page 4.  This would allow your signal of +/-1 mV of the expected value, the test also indicating panels.

Does that help?

best,

Tags: NI Hardware

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