Hi,
There is something I don't understand while using the T7.
When GND and AIN1 are connected, it becomes almost 0.0V.
However, the voltage is displayed even if the sensor is not connected to AIN1.
In Kipling Analog Inputs, 3.3V value is observed(Fig 01).
In LJLogM, the waveform between 2.7 and 10.0 V is observed(Fig 02).
In LJStreamM, -10.0V is observed(Fig 03).
I wonder how these values can be observed with no sensor connected.
Any advice would be appreciated.
File Attachment:
.png%3Fitok=PHGBxf6M "EEV Blog Reviews LabJack T7-Pro & Software Tools")
.jpg%3Fitok=B1YcuDFK)
.png%3Fitok=Ybt-OlgU "LabJack + JEDI One Can Create a Powerful Distributed DAQ Ecosystem")
The voltage at the AIN when unconnected is largely undefined, but will often pull towards the power rails. The following page has related information:
https://labjack.com/support/app-notes/floatingunconnected-inputs
If you would like to test the AIN, we recommend using well defined test signals such as VS and GND. The following page has some basic tests:
https://labjack.com/support/app-notes/test-AIN