Generating 1mv output signal from AO1 using NI 9381 card

Hi,
I am using NI 9074 cRIO & NI 9381 IO card, I am trying to generate 1mv signal from the AI port.
1. Programatically i am supplying 1mv to AO port and reading AI port.
2. On the AI port i am getting 22mv without connecting AO port to it .
3. Is there any method to achieve this task.
Please help me in this.Thank you.

According to the specifications the offset error can be as large as 16 mV depending on calibration and temperature.
Devices with input multiplexers can experience an effect called ghosting which results from capacitances in the input circuitry charging to unknown voltages due to leakage currents from adjacent channel inputs or other internal circuit nodes. Measurements made with the input open or floating do not have any meaning. The manual recommends input source impedances less than 1000 ohms.
As has already been mentioned the resolution is larger than 1 mV. When you combine the offset and gain errors of both the AO and AI channels, in the best case you will not know the output within 11.5 mV and in the worst case the error could be greater than 66 mV.
If you need both 1 mV resolution and 1 mV accuracy, you will need a better device.
Lynn

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