Megger 1552 Problems

S

slacky1230

-

Joined

Jun 2, 2012

Messages

133

Reaction score

3

• Jul 29, 2017

• #1

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

-

Mentor

Nearly Esteemed

Arms

Joined

Sep 5, 2010

Messages

73,534

Reaction score

71,830

Location

cheshire/staffordshire

• Jul 29, 2017

• #2

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?

 

T

The Ghost

• Jul 29, 2017

• #3

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

 

telectrix

-

Mentor

Nearly Esteemed

Arms

Joined

Sep 5, 2010

Messages

73,534

Reaction score

71,830

Location

cheshire/staffordshire

• Jul 29, 2017

• #4

like this:

 

OP

S

slacky1230

-

Joined

Jun 2, 2012

Messages

133

Reaction score

3

• Jul 29, 2017

• #5

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

 

OP

S

slacky1230

-

Joined

Jun 2, 2012

Messages

133

Reaction score

3

• Jul 29, 2017

• #6

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

 

telectrix

-

Mentor

Nearly Esteemed

Arms

Joined

Sep 5, 2010

Messages

73,534

Reaction score

71,830

Location

cheshire/staffordshire

• Jul 29, 2017

• #7

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

 

OP

S

slacky1230

-

Joined

Jun 2, 2012

Messages

133

Reaction score

3

• Jul 29, 2017

• #8

wouldn't that trip the rcbo?

 

T

The Ghost

• Jul 29, 2017

• #9

slacky1230 said:

trip the rcbo?

Click to expand...

See post no. 4

 

Strima

-

Arms

V.Nearly Esteemed

Joined

Mar 14, 2012

Messages

5,112

Reaction score

6,603

Location

St Neots

• Jul 29, 2017

• #10

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.

 

OP

S

slacky1230

-

Joined

Jun 2, 2012

Messages

133

Reaction score

3

• Jul 29, 2017

• #11

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

 

OP

S

slacky1230

-

Joined

Jun 2, 2012

Messages

133

Reaction score

3

• Jul 29, 2017

• #12

is the picture just basically showing to bypass the rcbo

 

telectrix

-

Mentor

Nearly Esteemed

Arms

Joined

Sep 5, 2010

Messages

73,534

Reaction score

71,830

Location

cheshire/staffordshire

• Jul 29, 2017

• #13

slacky1230 said:

is the picture just basically showing to bypass the rcbo

Click to expand...

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.

 

T

Toneyz

• Jul 29, 2017

• #14

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.

Click to expand...

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

-

Mentor

Arms

V.Nearly Esteemed

Joined

Sep 22, 2016

Messages

3,786

Reaction score

4,073

Location

North east

• Jul 29, 2017

• #15

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.