With respect, I would advise you to go and read BS EN 61010 and GS38
Yes the volt meter would be fine if only ever used on volts. It is what
happens when things go wrong, with a meeter that has been designed to cope
with the short circuit current, then there is little problem. If not there
is signficant risk of injury. For interest look here
That cheap meter is not designed to deal with the 1000s of amps that can
flow from the mains, it should be limited to battery operated equipment, or
where the supply is energy limited. I have seen one case where a glass fuse
blew in a dvm, but it did not stop the arc, infact the inside of the fuse
was plated and the arc only stoped when the test leads burnt out. If you are
testing mains a set of GS38 compliant (fused) test leads is strongly
recomoned. see below
http://www.edw-uk.com/e-wholesaler/Robin/item_sl100_10.htm how much is your
sight / hands / hearing worth?
James Salisbury B.Eng(Hons) MIEE
Scary stuff and there are of course risks with anything. The probability
of getting run over is, I would think higher than the scenario you
If the device is approved in the UK to be used to test mains voltage,
then it is approved to test mains voltage. Sure, it's better to use e.g.
a Fluke with well spec'd test leads (as I do) but then there's always a
quality / price trade off. It's the same with cars, a Fiesta is liable
to come off much worse in an accident than a rugged 4X4. Are you going
to tell people not to drive Fiestas because they are less safe ?
Geoff Drage B.Sc (Hons) MIEEE
Presenting a low impedance to a high current source
with your hands is always a bad idea - much better to use
a clamp meter.
I can't ever remember using a probed meter on Amps
except on SELV gear
Better to kill the power and start injecting your own
& use Mr Ohms to figure out whats going on
Glass at high temperature will conduct anyway
IIRC there are more injuries from arc flash than
On Sun, 7 Dec 2003 00:37:38 -0000, "Chris Oates" <none> wrote:
A layman's explanation I have heard is that making an observation
opening the box "Collapses the wave function" of the cat.
Bad news for the cat.
I can think of several classes of circuitry upon which, making an
"observation" with a "Maplin 5 Quid Multimeter" might well have their
wave function collapsed.
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