Incorrect current reading when no load

stfns

Hello,

I have an issue with 1 of my Shelly 3EM's. It is set up to monitor 3x 1 phase according the "1 phase wiring up to 3 different circuits" as stated in the manual.

When there is no load (0W) on the phase I still see a current of 0.15A and 0.37A. I measured it with a separate clamp meter (Testo 770-3) and that displays the correct 0A.

When there is a load both the Shelly and my Testo display the same value.

Is this a bug? Others have witnessed the same behavior?

Firmware 20201124-092854/v1.9.0@57ac4ad8 but also the same on 20210122-155800/v1.10.0-rc1@00eeaa9b.

PXL_20210306_130600059.jpg PXL_20210306_130622042.jpg PXL_20210306_130748402.jpg PXL_20210306_130908410.jpg FireShot Capture 218 - ShellyEM3 - 10.0.2.171.png FireShot Capture 217 - ShellyEM3 - 10.0.2.171.png shelly3emcurrent.png?

stfns

Nobody?

Seven of Nine

Are you sure the clamps are connected to their "paired" connectors?
They are calibrated to the specific connector so Clamp A has to be connected to A, B to B and C to C..

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archi

It is possible that the clamp is near a circuit that has load and this generates induction giving the value you read in the circuit without load.

You can put a long cable to keep the clamp away and try if there is reading in this way

archi

I have performed a check with my EM devices.

If the clamp has cable nearby. At the time it passes current by the cable, the clamp starts showing a small measure.

Incorrect current reading when no load

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