NI 9269 Offset by 13.68 V

[abramara]

So I'm using a NI 9269 for generating DC voltage. For the a01 and a03 channels, my outputs are offset by 13.68 V. Is this some kind of calibration issue? If so, how do I rectify it?

Thanks,

A R

[crossrulz]

Is it truely an offset or is that just the maximum it can go to?  Like if you told it 5V it goes to 18.68V.

My first thought is that this is a grounding/wiring issue.  After that, I would say there is something wrong with your module and you should call up your local NI rep and ask them what can be done for repair and/or swapping out modules.

[SnowMule]

What's it powered off of?  Sounds strangely close to automotive charging voltage.

For starters I'd say check the connections and grounds.

[abramara]

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@crossrulz wrote:

Is it truely an offset or is that just the maximum it can go to?  Like if you told it 5V it goes to 18.68V.

My first thought is that this is a grounding/wiring issue.  After that, I would say there is something wrong with your module and you should call up your local NI rep and ask them what can be done for repair and/or swapping out modules.

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Yup it's a true offset. If i set it to 5V it goes to 18.68, set to 10 I get 23.68 (although the limit of the device is +/- 10V). 

[abramara]

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@SnowMule wrote:

What's it powered off of?  Sounds strangely close to automotive charging voltage.

For starters I'd say check the connections and grounds.

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It's powered off of USB through the cDAQ chassis. 

[Dennis_Knutson]

Since the outputs are stackable to get up to 40 volts, you really need to provide the exact wiring that you have done.

[crossrulz]

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@abramara wrote:

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@crossrulz wrote:

Is it truely an offset or is that just the maximum it can go to?  Like if you told it 5V it goes to 18.68V.

My first thought is that this is a grounding/wiring issue.  After that, I would say there is something wrong with your module and you should call up your local NI rep and ask them what can be done for repair and/or swapping out modules.

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Yup it's a true offset. If i set it to 5V it goes to 18.68, set to 10 I get 23.68 (although the limit of the device is +/- 10V). 

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Then you have a wiring issue.  Do you have a diagram of exactly how you have it wired up?

[abramara]

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@crossrulz wrote:

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@abramara wrote:

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@crossrulz wrote:

Is it truely an offset or is that just the maximum it can go to?  Like if you told it 5V it goes to 18.68V.

My first thought is that this is a grounding/wiring issue.  After that, I would say there is something wrong with your module and you should call up your local NI rep and ask them what can be done for repair and/or swapping out modules.

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Yup it's a true offset. If i set it to 5V it goes to 18.68, set to 10 I get 23.68 (although the limit of the device is +/- 10V). 

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Then you have a wiring issue.  Do you have a diagram of exactly how you have it wired up?

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The wiring isn't too complicated. The module is used to generate DC voltage. There is + and - terminals. I have these hooked up directly to the DMM. 

[Dennis_Knutson]

If it's not that complicated, why can't you attach the diagram? You said you were using multiple modules and its important to know if you've somehow connected one to another. This is a simple request.

[abramara]

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@Dennis_Knutson wrote:
If it's not that complicated, why can't you attach the diagram? You said you were using multiple modules and its important to know if you've somehow connected one to another. This is a simple request.

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I didn't attach a diagram cuz I didn't see how it would help. Essentially, the four channels are used as four different voltage sources. They are not connected together.