Hi,

We recently purchased a DT80 Series 4. I've noticed that there is no connectivity between the ground terminals, including between digital grounds and analogue ground. When I enable the 12V output, I cannot see a voltage drop between the 12V output and digital grounds. However, I can see an 11.5V difference between the housing ground (the screw on the side of the DT80 housing with a ground symbol).

I have tested a few thermocouples and they do work, so it seems like the problem is isolated to the ground terminals. I haven't changed any firmware and I'm using dex 2.0.

Do you have an idea about rectifying this issue?

Looking forward to hearing from you.

Best,
Waruna

Hi war,

The analog ground (A GND) is not a true ground, thus the reading of the analog channel floats (without ground reference). However, the digital ground (D GND) is connected to the actual ground, this approach is because some digital signal requires a strict ground reference.

When you enable the 12V output using the PWR12V=1 command, you will be able to measure the voltage between the 12V pin and the D GND pin. Otherwise, the 12V output remains inactive.

If you can measure nearly 12V between the 12V pin and the ground pin but fail to do the same with the D GND pin then there is some issue on the board. You may need to send the unit back for assessment.

• D GND pin, ground pin and the casing are all connected.

Best regards,
dataTaker Expert