What is the sampling rate of Dracal Technologies USB measurement modules for real-time control?

It depends on the product and on the tool you use to read it:

• DracalView and the VCP option (POLL command) can poll some products, such as the BAR20, as often as every 100 ms (VCP protocol).
• MQTT Publisher: a new value every 100 ms by default (MQTT documentation).
• REST JSON API: your code requests a reading whenever it needs one, and each value comes with its UTC timestamp (API documentation).
• Command line tool: 1 s by default, adjustable with the -I option (quick start guide).

Keep in mind that a 100 ms polling rate does not guarantee that the value is refreshed every 100 ms: the sensing component itself can impose its own limit. For example, the TMC200 samples every 280 ms. Check the sampling rate in each product's specifications.

Also, our instruments handle the acquisition part: the feedback loop itself runs in your controller or software, as we explain in what Dracal doesn't do. For real-time process control and high-frequency test automation, our article Which integration tool do I need? recommends the REST API.