What is a typical level of noise on a signal 4-20 my?

I have a laser distance measuring device "time of flight" connected to a NI9203 module (I +/-20mA).

The sensor is configured to my exit 4 at 200 mm and 20 my 1800 mm (i.e.  0.01 my / mm).

The application requires a resolution of 1 mm, but I am currently getting 2-4 mm of the noise.

The noise is not introduced during the phase of action due to the data obtained by the serial port are good (see attached image comparing analog and series data).

The noise has an amplitude of 0.02 to 0.04 my (0.1-0.2% of full scale).  Is a reasonable level of noise or can I expect better results?

I'm testing in an office where I would expect low levels of electrical interference.  I use a cable tank and short cable trays.  The final application will be in an environment of noiser with many more long runs of cable.

To remove the sensor as the source of noise I replaced it with a 9V battery in series with a 820 Ohm resistor to generate the signal of my 10.  Using the same cable and channel DAQ, I get a similar noise level.

The sensor has a 16-bit converter DA and the DAQ card has a 16-bit AD converter that should be more than enough for this application (1600mm / 2 ^ 16 = 0.02 mm resolution).  My understanding is that the current loops have a high level of protection against noise. Is it possible that there is a problem with my DAQ card causing the noise?

the specification shows an accuracy range of 0.049mA.  This is the best you can hope for with this device and is not too bad!

What do you mean by "noise?"

Quantitization uncertainty can be reduced by averaging.

EMI/RFI can be filtered post acquisition

Good connections and wiring (you seem to be aware of) can reduce interference.

Tags: NI Hardware

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