This code was used for the light-bulb demonstration for World Metrology Day 2024.

Three 34401A DMMs are used to measure either AC voltage or AC current for an LED bulb and a Halogen bulb and a web server is used to display the values in real time.

Prerequisites

Python (with the py-Launcher option enabled) and Git.

Set up

Run the following commands in a terminal to set up the Python environment

> git clone https://github.com/MSLNZ/pr-wmd-2024.git
> cd pr-wmd-2024
> py -m venv .venv
> .venv\Scripts\activate
> pip install -r requirements.txt

Run

1. Update the records dictionary in equipment.py for the three DMMs that are used, in particular, edit the COM# address value.

2. Run the following command to start acquiring data and to start the web server

> run.bat

Source Files

• acquire.py Runs in a loop to send voltage and current values to the web server.
• equipment.py Provides communication to a 34401A DMM to either measure voltage or current.
• webapp.py Runs a web server to display the voltage and current values in real time.