Extech AC/DC Clamp Meter Offset

[Samuel M. Goldwasser]

I have an Extech 380652 that seems to work well in general but has
an approximately 0.06 A offset in the AC Amps mode on the 20 A range.

The user offset adjust pot only works on DC Amps.

Does anyone know if any of the 3 pots inside are for the AC amps offset?

Thanks!

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[Jamie]

Not just extraneous pickup from building wiring maybe ? Probably not, but
just a thought ...

Arfa

The op should be lucky its down that low on AC.

I have an extech my self (different model), that seems to have
a undocumented feature that appears to calibrate the AC mode of the
clamp when I hold down one of the buttons for like 4 secs or more.

 

[Samuel M. Goldwasser]

The op should be lucky its down that low on AC.

I have an extech my self (different model), that seems to have
a undocumented feature that appears to calibrate the AC mode of the
clamp when I hold down one of the buttons for like 4 secs or more.

This is a pretty basic model, no buttons, only 3 slide switches.

And to Arfa's question, no not stray fields.

Thanks!

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[Samuel M. Goldwasser]

0.3% of FSD error? Isn't that quite good for this sort of device? One I
have is quoted at +/-2%. Of course with a constant error there's always
the temptation to sort it out.

If it were the clamp-on DC range, it would be good. But the AC clamp-on
is just a transformer secondary. It SHOULD read 0 with nothing there!

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[Samuel M. Goldwasser]

If it were just a plain winding that might be so. But it has to open to
allow fitting round a cable.

Same offest open or closed. This meter is in mint condition, no visible
damage anywhere.

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