Megger mft1553

[Hammyboy]

Hi first post on here, hoping i could find some help.

I'm doing testing using a Megger mft1553

Im trying to do zs test. My voltage is coming up but its not giving me an ohms ready, the earth symbol just keeps coming up.

Any ideas on what is up with it, and how i can fix it?

Thanks.

 

[oharaf]

Are using all 3 leads? are they in the correct terminals?

Are you measuring Zs or Ze?

It would appear you have an earth missing somewhere on the circuit you are testing.


Have you checked that the batteries are not shot? If I remeber correctly on Megger MFT the earth symbol appears when they are finished

 

[Click-Sure]

Try new batteries, definately.

 

[Hammyboy]

Zs i was using the lead that has the plug on the end of it.


I will try the batteries tonight, thanks for the advice
Looks like ive found a good forum here

 

[ColJack]

tried it on a different circuit?
might be a missing earth..

 

[Hammyboy]

tried it on a different circuit?
might be a missing earth..

Ive tried it on a few different circuits i think its the batteries.

 

[oharaf]

ALways keep a pack of 100 batteries withyou, MFT eats them, alaways turn it off when not using it even if it is for 30 seconds

 

[ban-all-sheds]

100

Blimey - how many does it get through a day?

 

[ColJack]

depends on the size of the site and the tests being done, but I've seen the guy doing the testing on a hotel I worked on change the batteries at the start of every day..
then again he was dead testing for 8 hours a day, so that's a lot of R1+R2 and IR tests..

it was a pretty big site..
2 bars, 1 restraunt, 98 rooms on 2 floors, swimming pool, gymnasium, various conference suites etc... and just him doing the testing..

 

[oharaf]

Twice it has happened to me on jobs BAS, and there is never somewhere close to get some, or they are cheap and a right royal rip off.

So bulk buy mine and keep 2 spare sets in the case. The dead testing can really sap your cells particularly IR

 

[RF Lighting]

My metrel takes C size batteries and lasts forever

 

[Adam_151]

My metrel takes C size batteries and lasts forever

But when you do change them, do you find the battary contacts can be a bit fussy? Its not that they ever give a bad connection, just sometimes you can end up with them not making a connection at all?

I found that if I popped the batteries in from the end, this would happen, but if I put them both in and popped them in from the middle (if that follows properly) then there were no issues.... I did end up accusing the wholesaler of giving me duff batteries at first though

 

[RF Lighting]

I've never really had any bother with mine

 

[securespark]

My metrel takes C size batteries and lasts forever

Yes!!

But when you do change them, do you find the battary contacts can be a bit fussy? Its not that they ever give a bad connection, just sometimes you can end up with them not making a connection at all?

Yes!!

I sparked a company-wide investigation into this problem, by changing my batteries one day & finding the Alphatek not working. I initially thought it was the batteries because on fitting the old ones, the unit fired up again. Strange, I thought. All the new batteries I fitted did not work, but the old ones did, so I naturally assumed it was the batteries.

Wrong!!

There is a small design fault with the battery carrier (which from memory is supplied by RS). The end battery on one side can be held off the terminal by a small piece of plastic on the moulding.

I solved the problem with one Alphatek by screwing a small self-tapper into the hole where the battery contact is riveted onto the carrier. On another, I used a Stanley to slice off the offending sliver of plastic.

Contact restored!

 

[sparkyspike]

My Fluke tells me to change batteries before they get too low, allowing me time to get them!