EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: Ochsenfrosch on May 25, 2017, 07:35:22 am
-
Hi, I opened my Testboy TB-3000 multimeter. It's about 70,-€ in Germany.
Have some impressions.
-
It might just be the angles, but...these look awfully close to each other on the input protection. I think a spark might be able to jump that distance.
(https://www.eevblog.com/forum/testgear/opening-a-testboy-tb-3000/?action=dlattach;attach=318402;image)
And the soldering... :wtf:
-
Looks like someone cleaned their soldering iron at the current shunt...
(https://www.eevblog.com/forum/testgear/opening-a-testboy-tb-3000/?action=dlattach;attach=318400;image)
That's called "calibration".
Looks like the resistance was a little bit high so they added some extra solder to fix it. :popcorn:
TÜV Süd/GS approved
The design looks OK but I bet the meter they submitted for approval wasn't soldered/assembled by the same person that soldered/assembled yours.
-
That's called "calibration".
To quote Dave, it is done by nude virgins or old gray beards with their tongue the correct angle. But, I think you are correct, in this case old Bathild looked at the meter in a test rig and cleaned the tip of her soldering iron on the shunt.
-
That's called "calibration".
To quote Dave, it is done by nude virgins or old gray beards with their tongue the correct angle. But, I think you are correct, in this case old Bathild looked at the meter in a test rig and cleaned the tip of her soldering iron on the shunt.
No, it's true!
Normally they're manufactured a bit low and they put a few "nips" in them with a pair of side cutters until it reaches a known value, like this:
(https://www.eevblog.com/forum/testgear/opening-a-testboy-tb-3000/?action=dlattach;attach=318422;image)
(sort of like laser trimming but without the lasers)
If it's a bit too high? Add a blob of solder!
-
Or... they might just have been cleaning their soldering iron.
-
Horrible build quality :scared:. I am in doubt that the TÜV / CE certification is real . Scammer :--
-
Same issue with my TB 3000 which I posted in 2013 :--
https://www.eevblog.com/forum/testgear/soar-multimeter/msg192944/#msg192944 (https://www.eevblog.com/forum/testgear/soar-multimeter/msg192944/#msg192944)
-
Is this a rebranded Mastech or something??
-
Horrible build quality :scared:. I am in doubt that the TÜV / CE certification is real . Scammer :--
the certification is only done on a submitted device - the one they built carefully and de-fluxed first!!
-
Yeah, before I put it back together, I bent them apart and put some hotglue (forgive me) between the leads.
Careful with that. When you put glue on it, I think you have to worry about creepage distance, which is greater than the clearance requirement for a given voltage. With hot glue, though, you probably couldn't easily put on a blob that's too small.