Jump to content
  • 0

Issue with Raspberry MCC 128 (ADC) and optical detector ground


Saha

Question

image.png.e9099226cbb009a0e5ffe11e19b4afe8.png

I have a circuit connection like this:

The optical detector is powered by a 12V battery, the ground wire of the detector is left open.

The raspberry pi computer with MCC 128 data acquisition board (ADC) is powered by 5V from a step-down transformer.

When trying to connect the BNC cable of the detector to the ADC (computer), the detector shuts down. If either the detector or the computer is connected to the grid (other one is connected to the battery) then everything works fine. Is it a grounding issue? I’ve tried to connect all grounds together to the ground from the grid to have a common ground with no success. Can anyone please explain the mechanism here, or provide me some relevant links?

Let me know if you have any confusion with the circuit design.

Thanks.   

Link to comment
Share on other sites

4 answers to this question

Recommended Posts

  • 0

The manual says to connect a 50-ohm resistor to the ground on the detector output. The output is current, and the resistor generates the output voltage. Connect the MCC 128 input across the resistor. I recommend placing the inputs in differential mode for the measurement. If the signal is too low with the 50 ohm resistor, use a 1000-ohm load resistor. 

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...