Just bought one of these
Reviews seemed good only needed it to confirm circuit is off before I cut i
nto it. It seems to detect voltage but when I switched the circuit off it s
till seems to think there is voltage although the beep / led is not continu
ous. I know the socket is off as I had something plugged into it which then
went off when I switched the circuit off.
The instructions say that it self tests when you press the power button and
indicates ok with a flashing LED. Mine gives a solid green.
Just took it back to Screwfix and tried 3 others and non seem to do the sel
f test thing. Brought a new one home to test on the off circuit and same pr
It seems unlikely that all 4 and dead (maybe a dodgy batch) but now thinkin
g maybe I am missing something?
On Mon, 04 Dec 2017 00:10:01 +0000, John Rumm wrote:
I have a Megger that can do this. It beeps when in close proximity to a
high voltage. Not sure about the possibility of false positives, though
(inductive coupling) I must check it out one day when I can be arsed.
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On 04/12/2017 05:18, firstname.lastname@example.org wrote:
Yes! The whole purpose of the volt stick style detector is that it can
make an assessment without needing any direct contact to the circuit,
and so avoids all the risks associated with that.
Also keep in mind that a false positive reading is equally possible from
a high impedance volt meter.
On 04/12/2017 12:55, email@example.com wrote:
You have that back to front. High impedance meters are the norm. Any
common digital multimeter will likely have an input impedance in the
megohms range, and that is high enough to see capacitively coupled
floating conductors as live.
This is why test gear makers specifically make kit for mains test
applications that have low or adaptive impedance measurement options to
eliminate these spurious readings.
Goo look at the specs for something like a Fluke 114, or 115
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