JavaScript client library for the EMScope EMI measurement instrument (SW ≥ 4.1).
This is the browser counterpart of the Python api_v5.py client and follows the exact same wire protocol. Refer to the WebSocket API documentation for the full protocol description.
The api_v5.js and api_example_v5.html files are provided for EMScope software version 4.1 and later.
Include api_v5.js in your HTML page. No external dependencies are required for browser use. Under Node.js, install the ws package and pass it via the WebSocketImpl option (see below).
The example file api_example_v5.html is a self-contained browser application with a live spectrum plot, configuration panel, and message log. Open it directly in a browser after setting the instrument IP address.
Unlike the Python client (which uses an explicit receive loop), the JavaScript client is event-driven. The WebSocket connection opens automatically when the object is constructed. All incoming messages are delivered via the callback.
| Value | RBW | Frequency range | Standard |
|---|---|---|---|
| 200 | 200 Hz | 9 kHz – 150 kHz | CISPR 16-1-1 |
| 9 | 9 kHz | 150 kHz – 30 MHz | CISPR 16-1-1 |
| 120 | 120 kHz | 30 MHz – 110 MHz | CISPR 16-1-1 |
| 1 | 1 kHz | 10 kHz – 150 kHz | MIL-STD-461 |
| 10 | 10 kHz | 150 kHz – 30 MHz | MIL-STD-461 |
| 200_9 | dual | 9 kHz – 30 MHz | CISPR dual-band |
| 1_10 | dual | 10 kHz – 30 MHz | MIL dual-band |
The library is compatible with Node.js. Install the ws package and pass it as the WebSocket implementation via the constructor options. See the source file for details.
The api.js and api_example.html files are provided for use with EMScope software versions 3.13 and earlier.
Required: a modern browser with native WebSocket support.