Products > Test Equipment
Metrix MX407 megohmmeter - Quick teardown and repair.
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shakalnokturn:
New meter arrived the other day, bought cheap and not working once more.
(Paying the price for working equipment takes the fun out of it, and is not worth the bother half the time, as things come with problems even when sold as working...)

It was was making a rattling sound so I didn't turn it on, I took it apart.
Found a loose melf diode floating around, a close look made it obvious where is came from, et voilĂ ! Another working meter in the heap.

Now the downside: Metrix was one of the reference brands for meters in France, they have since been bought out by Chauvin-Arnoux who still sell Metrix and Multimetrix branded meters.
Metrix / Multimetrix seem to have been moved down to the low-end, the Chauvin-Arnoux being the serious stuff. (I wish someone would review / teardown the Metrix Scopix III handheld scopes here!)

The build quality of this megohmmeter is just way under what I was expecting from Metrix, clearly a Chinese job, the "QC" sticker was on the back but components drop-off the PCB from being only half soldered.
The ADC is a GC7135, equivalent to the ICL7135 but there again, a little deceiving, as it is the cheap far-east copy.
The PCB is marked "Meiyad" just under the transformer so possibly none of the design is done by Chauvin-Arnoux at all.


shakalnokturn:
Self-updating as usual...

This meter is the same as the AEMC 6527 model.

The PCB manufacturer "Meiyad" also made the PCB's in at least some "Klein Tools" DMM's.
threephase:
That's intriguing, Meiyad is the same marking on the PCB for the Extech MG302 and DiLOG DL9307 insulation multimeters that I have been playing with.

I believe that these are really the DT9985 manufactured by CEM.
shakalnokturn:
Your two meters are definitely the same model.
If Meiyad are a PCB manufacturer no doubt they'll have their stamp on quite a bit of kit, I'd just be curious to which company(/ies) they work with and who actually designs things before they are X,Y,Z branded.

Overall the design isn't awful, it's just under what I'd expect for gear in that price range.

I ended up selling the MX407, I've kept a British made (Megger) Newlec NLINS3 and a Fluke 1520 as insulation meters.

tekn95:
Hello everyone,
 I am looking for references or zener zener z2, z3, z5 for my mx407 if someone can help me.
 thank you
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