Megger fault

[buzzlightyear]

Has from me last post, I wonder if any body know or has a problem with a megger error conecet fault before I send to a repair jobby.

 

[ferg]

There is a known issue with all Megger MFT's...... None of them are Flukes.

 

[telectrix]

There is a known issue with all Megger MFT's...... None of them are Flukes.

best thinkg a bout Flukes is you can use the box as a seat. (leave the Banana inside and test with a Megger).

 

[LukeD]

From what i am reading... No way would i invest in a new megger . Seems they are not as good. I would buy Kewtech all day long

 

[HappyHippyDad]

From what i am reading... No way would i invest in a new megger . Seems they are not as good. I would buy Kewtech all day long

That John down the pub seems to know everything ??

 

[LukeD]

That John down the pub seems to know everything ??

Well one guy who owns a business employing 8 guys upgraded to the latest meggers and he has had the rep around trying to explain why the machines seem to be having issues . They have had to pull older models out to get on with their work until the issues on the new ones are solved . lets see how Kewtech develop their range over the next few years . But the KT63 was a huge game changer for many .

 

[telectrix]

i've used Meggers from back in the wind-up testers. never had any issues. my 1553 (2008 manufacture) is perfect, passes calibration evry time. just got to see how good is this new 1721, so far, seems 100%

 

[HappyHippyDad]

I've had the 1731 for 2 years, zero problems so far and I love it. However, 2 years isn't that long. It cost near enough £1000, so I expect it to last for a good 10 years without issue for that price.

 

[telectrix]

I've had the 1731 for 2 years, zero problems so far and I love it. However, 2 years isn't that long. It cost near enough £1000, so I expect it to last for a good 10 years without issue for that price.

just been having a play with 1721. it's the Zs that's different. on the 1553 I selected lo/hi with dial. now it's a function button. takes a little longer, but at £500 for a mint condition, nearly new tester, i ain't moaning.

 

[Dartlec]

My 1711 does give some odd readings on 'Hi' (2 lead) Zs - consistently lower than my 1552 (which is still going strong.)

It flew through calibration earlier this year though. But then apparently, the standards they validate to don't actually test Zs that low for some reason. The lowest they test at is 0.65Ohm and the inconsistency I get is in the 0-0.3 range.

Number of times it's given me a Ze of 0.01 or less and it took a few times for me to twig that I wasn't that close to the transformer!

2 wire No Trip Zs is a game changer though so still prefer using it.

 

[pc1966]

2 wire Zs is a game changer though so still prefer using it.

My suspicion is few MFT actually measure Zs with any real accuracy.

 

[Dartlec]

My suspicion is few MFT actually measure Zs with any real accuracy.

It's consistently inconsistent at least I guess, which is better than inconsistent inconsistency (say that 3 times quickly!) ?

 

[Mikegh]

Electrical Tester | Megger

We have retained a selection of specific articles on this site due to their popularity

uk.megger.com

Decent article

 

[pc1966]

It's consistently inconsistent at least I guess, which is better than inconsistent inconsistency (say that 3 times quickly!) ?

I just wish some MFT would offer 4-lead connections for doing impedance measurement, even if it is still just the modest current or low non-trip currents as normally done. That way they could eliminate the lead and contact point resistance variability.

To be fair on my MFT, it is fairly sane for normal Ze/Zs values of 0.2 ohms or so on high current mode, and for high-ish values like 5-10 ohms rod impedance on non-trip mode. I just can't afford/justify a four-wire grid impedance meter for low Zs value!

But I find the non-trip on sockets, etc, can vary from say 100A to 150A PFC, etc each time I repeat the test.

 

[timhoward]

When I had separates, the Megger LTW325 I had was rather hit and miss on the low current tests. I sometimes used to use the trick mentioned in the Kitcher book - lock off breaker / RCBO, join L and CPC at circuit end, and use a high current test between bus bar and outgoing live at CU. It had the extra benefit of thoroughly confusing anyone watching too!