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openenergymonitor / emonpi

Raspberry Pi Based Energy Monitor. Hardware, Firmware & related software for the PI.
https://guide.openenergymonitor.org/setup
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Calibration out of date? #138

Open snerd9334 opened 2 years ago

snerd9334 commented 2 years ago

https://github.com/openenergymonitor/emonpi/blob/9f87e5380ac4042e300f6f80d115695fc491b00f/firmware/src/src.ino#L93

The model referenced here (77DE-06-09) is now no longer manufactured. It has been replaced with 77-DB-06-09.

Spec sheet for old model: https://www.farnell.com/datasheets/1596487.pdf Spec sheet for new model: https://www.farnell.com/datasheets/1772940.pdf

There are differences between the specifications of the two transformers, so I wonder if the calibration figure on the line referenced at the top of this post needs updating?

Thank you

snerd9334 commented 2 years ago

Further investigation has found the following value should be used for the 77-DB-06-09 (UK Plug) : 268.97

Source: https://learn.openenergymonitor.org/electricity-monitoring/ctac/calibration