tensioning of excitement to 0 after VI

Hello

I use an SMU-4331 card to acquire the data of strain gauges. I use the AI bridge DAQmx to collect data (we want data report of bridge for now - see the attachment for my VI) for the acquisition of data and have noticed (using a voltmeter to check), that even after the VI is stopped, the voltage is always provided for the active channels.

I found that two previous posts in other forums that the question this. The first was an answer that says to set the source of excitement 'None', which is not possible when using the AI bridge DAQmx. The second says that the best that you can do to set the voltage to the minimum (0.625V). Is it in fact that the only way for the voltage to my gauges drop to zero either close my acquisition of data whenever the VI is stopped (and then the restart every time I want to run another test)?

In addition, if the continuous supply of excitement to channels is inevitable (without turning off the DAQ), this means that the module continues to actively provide excitement previously specified (as in maintaining this tension) after the VI is stopped, or it's just all that was provided when the VI has been stopped (so not actively setting to maintain the voltage at the original level)?

Thanking you in advance for any help that can be provided.

If I'm not quite clear on what I am asking, please let me know and I'll try to think of a better way to ask.

See you soon

Bart

Hello Bart.

If the device has power there will be excitement. Excitation of zero is not supported, there will always be at least 0.625V. If you reset the device, it will go to the excitement by default, but it will not be zero.

Software is not necessary to actively monitor the output of the excitement. The excitement will maintain the last voltage that was defined in the software. The voltage may vary slightly, but it will stay within its specifications of accuracy.

I hope that answers your question!

Tags: NI Hardware

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