Megger 1552 Problems

slacky1230 · Jul 29, 2017

Hi guys

Ive got a megger mft 1552 that reads high on no trip setting when performing an earth loop. The noise symbol also appears when testing. This happens 9 out of 10 times when performing this test.

I took it to a local company for repair and recalibration in april. Got the tester back which was meant to be repaired and recalibrated but foolishly i didn't check to see if all was ok. Came to use it a couple of months later and still the same.

Has any one had any similar problems and how did they solve it?

Thanks

telectrix · Jul 29, 2017

no-trip is a 3 lead test with the 1552. check the leads and also the 4mm sockets on the mft.

does itdo the same when using the 1363 lead?

The Ghost · Jul 29, 2017

Try using the higher current test instead of no trip current. Use this whenever you get noise on the test.

telectrix · Jul 29, 2017

like this:

[ElectriciansForums.net] Megger 1552 Problems

slacky1230 · Jul 29, 2017

I've tried it with the plug in lead and 3 leads both the same. quite frustrating really as other than that the testers bang on everything else works spot on

slacky1230 · Jul 29, 2017

sorry to sound dumb but what do you mean by current test?

telectrix · Jul 29, 2017

he means hi-current test. as opposed to no trip.

slacky1230 · Jul 29, 2017

wouldn't that trip the rcbo?

The Ghost · Jul 29, 2017

slacky1230 said:
trip the rcbo?

See post no. 4

Strima · Jul 29, 2017

Sounds like a silly question but have you got decent batteries in your Megger?

I've found anything below 10.5 volts will start to give odd readings.

slacky1230 · Jul 29, 2017

I've just picked up some new batteries that I'm going to swap over to rule this out

slacky1230 · Jul 29, 2017

is the picture just basically showing to bypass the rcbo

telectrix · Jul 29, 2017

slacky1230 said:
is the picture just basically showing to bypass the rcbo

yes and also to bypass the MCB if you want. but don't forget to remove the L-E short before re-energising or you'll have performed another test (unspecified by BS7671), commonly called the Bang Test.

Toneyz · Jul 29, 2017

telectrix said:
yes and also to bypass the MCB if you want. but don't forget to remove the L-E short before re-energising or you'll have performed another test (unspecified by BS7671), commonly called the Bang Test.

That seems how a lot of these so called electricians with their top of the range work ware and battery tools test. Now I've got some certs to write up hate doing it but if something happened etc./ now it's safe.

Ian1981 · Jul 29, 2017

I've got a megger mft 1552 and even with the batteries on 9 volts it still performs as it should.
Only ever change batteries when the symbol is displayed.
As it's a live test the battery power shouldn't matter.

Strima · Jul 29, 2017

It's worth checking the simple things first.

slacky1230 · Jul 29, 2017

although it's a solution to bypass and test on hi current I'd rather get my meter sorted so it's working correctly.

The Ghost · Jul 30, 2017

Yeh but is it working incorrectly. It does happen noise. Is this domestic or commercial. I have not encountered noise in a domestic so far but a couple of times in commercial offices.

slacky1230 · Jul 30, 2017

I know it can happen now and again but it's near enough all the time.

I've tried it in 3 commercial places with the same result.

Toneyz · Jul 30, 2017

All I can note I have only had the same experience as Vortigern only a few times at commercial places on my Megger MFT.

Strima · Jul 30, 2017

I've seen it a lot on Flukes, mainly telecoms sites and working on generators. Megger has always seemed to take noisy earth in its stride.

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The Ghost

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The Ghost

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The Ghost

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Toneyz

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