CPDCTRL

A python library and interactive command-line utility for measuring CPD (contact potential difference).

To run the interactive utility, launch Powershell, activate the python virtual environment and then run the script with ipython

cd cpdctrl
.\venv\Scripts\Activate.ps1
ipython -i .\cpdctrl\cpdctrl\cpdctrl-interactive.py

In the ipython shell, run help() to get a list of available functions and help topics.

Devices

Voltage Measurement:

• Keithley 2700 SMU for measuring the voltage (CPD)

Led Controller:

• Arduino Nano connected to a Thorlabs LEDD1B for controlling the light source (LED)
• Thorlabs DC2200