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open circed voltage

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#1 DanielIIC

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Posted 15 October 2012 - 11:03 AM

Hi, I have a bit of a problem with the U6-pro, 2 things happen and may be they are dependent. 1. I nothing is wired on the Lab Jack, not a single one, I get a reading on AIN of around 7 Volt, is this normal? This is gone If I connect the AIN with Ground level of the LabJack, so it is not a error in the reading. 2. If I have for example 3.000 Volt on AIN 1 and apply 5.000 Volt on AIN 2 than AIN 1 is changing from 3.000 to 3.020. If I do it the other way around than the 5 Volt chnage to 5.500V or simular. You can see that something is proper wrong but I just don't have a idea what is the problem. Any ideas? thanks Daniel

#2 LabJack Support

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Posted 15 October 2012 - 11:53 AM

1. That is likely fine. There is not predictable expected voltage from a floating channel:


2. If the reading from a channel varies depending on the voltage of the channel read previously, that suggests a settling problem. Perhaps the signal is weak? That is, does the signal have high source impedance?




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