Monitoring Mains Current: Experimenting with the SCT013 Current Clamp

RE: Monitoring Mains Current: Experimenting with the SCT013 Current Clamp

shabaz — Thu, 18 Jun 2026 17:35:35 GMT

I was curious about the original manufacturer of these current transformers. A family member happened to use identical ones for his work (but sourced from a known supplier), with some branding on them.

From that, the manufacturer is http://en.yhdc.com/ and they have datasheets available there for this sensor and loads of others.

They have some wide bandwidth models (e.g. 2 kHz to 500 kHz) that look interesting for other projects.

RE: Monitoring Mains Current: Experimenting with the SCT013 Current Clamp

shabaz — Wed, 17 Jun 2026 22:21:13 GMT

I tried the SCT013 with an ADC, and added the circuit I used to the blog.

Results are good, this is with the same fan as a load. I can see a stable 63 mV AC RMS being reported. This is with 12-bit measurements (but will try to improve that with averaging). The p-p value in the screenshot isn't a bug, it's not derived from the AC RMS measurement, it includes all noise captured, and it can be safely ignored.