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Inaccurate clamp meter?

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Commander Kinsey
Guest

Sun May 12, 2019 8:45 pm   



On Sun, 12 May 2019 18:12:27 +0100, Mr Pounder Esquire <MrPounder_at_rationalthought.com> wrote:

Quote:
Commander Kinsey wrote:
On Sun, 12 May 2019 17:05:57 +0100, Mr Pounder Esquire
MrPounder_at_rationalthought.com> wrote:
Commander Kinsey wrote:
On Sun, 12 May 2019 08:10:43 +0100, alan_m <junk_at_admac.myzen.co.uk
wrote:
On 11/05/2019 23:12, Commander Kinsey wrote:
On Sat, 11 May 2019 22:38:42 +0100, alan_m
junk_at_admac.myzen.co.uk> wrote:

The only way you will know that your multimeter is accurate is by
having it calibrated against a known standard, ideally specified
to 10x better than your meter.

Or by using it to measure a known current on a bulb I know draws a
certain current.


So your comparison standard is something British Gas used to give
away for free, possible so inaccurate that it hasn't got a
published specification for its current measuring capability.

"and by knowing what devices were running"

Plonk

Awww was my reply too difficult for you?

Fuck off Hucker.

I don't see any useful information from you.... do you even know what
a clamp meter is?

I used them 24 years ago with no problems. Now, just fuck off, man with a
degree who can't even use a clamp meter or get a job.
Just, fuck off Hucker.


I can use one that works correctly.

Lucifer
Guest

Tue May 14, 2019 12:45 am   



"If you get the right reading every time it must be a Fluke."

I have a Clamp Leaker 140. Are they any good?

Andy Bennet
Guest

Tue May 14, 2019 10:45 am   



On 12/05/2019 07:49, Brian Gaff wrote:
Quote:
If you are measuring volts then ac is best on a calibrated scope of course,
but I've seen some very strange results from clamp meters in the past, and
after all there are a lot of variables going on all at once.
Brian


I didn't know you could measure volts with the clamp part of a clamp meter.

If it is of the newer (as in less than 25 years old) hall effect sensor
devices then it will be more susceptable to stray magnetic fields. There
should be a calibrate/zero button on it somewhere which you should use
just before you clamp on to cancel all these effects out before measurement.

Lucifer
Guest

Tue May 14, 2019 1:45 pm   



On Tue, 14 May 2019 10:36:59 +0100, Andy Bennet <andyb_at_andy.com>
wrote:

Quote:
On 12/05/2019 07:49, Brian Gaff wrote:
If you are measuring volts then ac is best on a calibrated scope of course,
but I've seen some very strange results from clamp meters in the past, and
after all there are a lot of variables going on all at once.
Brian


I didn't know you could measure volts with the clamp part of a clamp meter.


You can't.


Quote:
If it is of the newer (as in less than 25 years old) hall effect sensor
devices then it will be more susceptable to stray magnetic fields. There
should be a calibrate/zero button on it somewhere which you should use
just before you clamp on to cancel all these effects out before measurement.


If you clamp both active and neutral they will cancel out and you
will get no reading.

I have a Clamp Leaker 140.
http://www.multimic.com/assets/e/catalog/e_ca_m140.pdf

http://www.multimic.com/assets/e/instruction_manual/e-ma-m140.pdf

Any idea how old?

Andy Bennet
Guest

Tue May 14, 2019 2:45 pm   



On 14/05/2019 13:31, Lucifer wrote:
Quote:
On Tue, 14 May 2019 10:36:59 +0100, Andy Bennet <andyb_at_andy.com
wrote:

On 12/05/2019 07:49, Brian Gaff wrote:
If you are measuring volts then ac is best on a calibrated scope of course,
but I've seen some very strange results from clamp meters in the past, and
after all there are a lot of variables going on all at once.
Brian


I didn't know you could measure volts with the clamp part of a clamp meter.

You can't.


If it is of the newer (as in less than 25 years old) hall effect sensor
devices then it will be more susceptable to stray magnetic fields. There
should be a calibrate/zero button on it somewhere which you should use
just before you clamp on to cancel all these effects out before measurement.

If you clamp both active and neutral they will cancel out and you
will get no reading.

I have a Clamp Leaker 140.
http://www.multimic.com/assets/e/catalog/e_ca_m140.pdf

http://www.multimic.com/assets/e/instruction_manual/e-ma-m140.pdf

Any idea how old?


The EMC BS EN 61326 standard was first released about 2006 so less than
13 years old.

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