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Calibration out of date? #138

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snerd9334 opened this issue Jun 2, 2022 · 1 comment
Open

Calibration out of date? #138

snerd9334 opened this issue Jun 2, 2022 · 1 comment

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@snerd9334
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float Vcal_EU= 256.8; // (230V x 13) / (9V x 1.2) = 276.9 - Calibration for EU AC-AC adapter 77DE-06-09

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
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snerd9334 commented Jun 2, 2022

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

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