metrel mi3000 testing for ze

CLB · Jul 20, 2012

You can reset the Metrel3000 back to it's factory state by holding down the right arrow key and then switching it on. Mine froze a couple of days ago and the manual that came with (on the cd) said how to reset it and it worked fine after that.
And yes, it has Loop Z for Ze readings. Earth croc onto disconnected supply earth, L & N test leads onto L & N terminals of the supply and got 0.14ohms. However, if you use the plug lead for testing for earth faults at a socket outlet you have to set it to Loop Z(RCD) which prevents the rcd tripping.
(Reset info is on p21/22 of the user manual http://------/NDcPJZ )

richy3333 · Jul 21, 2012

Thought only Megger's had problems according to the forum? :devil:

the pict · Jul 23, 2012

And have you zero'd your leads first,
Pict

drew35 · Jul 23, 2012

With the metrel you need to lose that 2v N to PE before it will test, you should just get the beep of refusal if you press the test button. And if you cant get a reading you need to put all your weight behind the probes to get a good enough contact.
I opened one of these Metrel's up once and inside its the same as one of those lottery pens that have all the balls in the top. You shake the pen and get a random six numbers, the Metrel works on the same principle with a bit of magic eight ball thrown in!!! Try doing the same test several times and you get vastly different readings, they should stick to making calculators and children's toys!

CLB · Jul 23, 2012

drew35 said:
And if you cant get a reading you need to put all your weight behind the probes to get a good enough contact.

Or you could just temporarily remove the protective shrouds on the tips of the probes :yes:

drew35 · Jul 24, 2012

CLB said:
Or you could just temporarily remove the protective shrouds on the tips of the probes :yes:

Eh??? For a start what protective shrouds! You need to push hard to get a good contact it doesn't matter if you have the shrouds on or not! If the machine beeps and fails to take a reading, or you get a high reading, push hard, I have this machine I should know!!! F wit...

CLB · Jul 24, 2012

drew35 said:
Eh??? For a start what protective shrouds! You need to push hard to get a good contact it doesn't matter if you have the shrouds on or not! If the machine beeps and fails to take a reading, or you get a high reading, push hard, I have this machine I should know!!! F wit...

As do I, and my test probes have removable plastic tips so that more than 2mm of the tip is exposed. You're just making hard work for yourself. Or maybe you should buy a new one, or have your one recalibrated (you do know about that don't you? Of course you do).