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NI PXI-4461 - its analog output is not generating a correct output.

Recently noticed that its analog outputs (AO0 and AO1) are not behaving properly. From my observation using NI MAX, if asking AO0 to generate 1V DC, the AI channel measures a value between -8.7V to -8.8V. If AO0 is set to 10V DC, AI channel measures a value between 0.8-0.9V. If AO0 is set to -5V DC, AI channel measures a value between -10.7 and -10.8V. If AO1 is set to 0V DC, AI channel measures a value between 0.0 and -0.1V. If AO1 is set to 5V DC, Al channel measures a value between 1.8 and 1.9V. If AO1 is set to 10V DC, Al channel measures a value between 3.8 and 3.9V. If AO1 is set to -5V DC, Al channel measures a value between -2.5 and -2.6V. If AO1 is set to -10V DC, Al channel measures a value between -6.3 and -6.4V. When I attempted a self-calibration, it displayed Status code: -200719. Could you provide a solution for this if possible? Based on my quick research, it seems like this is not something that can be fixed via software. Of course we bought this system approx. 6 years ago so I don't think we have any remaining warranties or service contract. It would be also great to know how much it will cost to repair this issue. Thanks, DK
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Hello DK:

 

With regard to the specific question. The error code stands for the next information:

 

Measurement taken during calibration produced an invalid AO offset calibration constant. If performing an external calibration, ensure that the reference voltage value passed to the calibration VI or function is correct. Repeat the calibration. If the error persists, contact National Instruments Technical Support. 

 

This information is detail here (page 43 third error code)

 

When this error code start appearing and also the system was working properly?

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