Hi, very excited we finally got in the 121 GW multimeters.
They've been a long time coming, let me tell you.
And they were supposed to come in like mid December or
something when I took pre-orders on the website for
supporters, and things like that, sorry and they've been waiting for these things.
And of course all the people on kick starter, the early baggers.
But we finally got them this morning after a few little delays at the port.
So let's open them up.
This is a box of 32 per box.
So we're just going to open one box and
do some stuff ta-da.
Here we go.
Look at this. This is actually the first time I've
gotten more than one or two like sort of production all pre-prototype units.
And it's the first time I've seen the box and everything finished.
There it is.
Made in Korea.
The EEVBlog no bullshit packaging 121 GW Multimeter and
look its got a little product hanger on it.
Didn't know about that.
So open it up and ta-da, the very first, the very first,
we've got in there is a thermal couple and a statement of calibration.
No its not a cal certificate.
So let's have a look ta-da the very first one thing of
beauty joy forever, still got the screen protector on there
look at that and here we got the serial number label.
There we go, that one's number 127.
Winner, winner chicken dinner.
So let's switch it on.
Version 0.01.
And, beautiful.
So now I'm gonna take 32 of them, and I'm gonna put them side by side and
just check them out, let's go.
I don't know why but
it's just immensely satisfying to see 32 meters lined up like that.
I just love tweaking all the knobs.
Look at it, thing of beauty, joy forever.
All right time to check these puppies.
Please excuse the camera angle.
I've got to do this for the time lapse but there you go.
I've got my 5 volt reference.
It's bang on to five volts, good enough for Australia.
And let's go through them.
This is the fun part.
Very therapeutic.
And there's the results for a nominal five-volt input,
which by the way is not the point where it's actually calibrated.
It's actually calibrated at 4.5 Volts or 45,000 count of
almost all the ranges except the oddball ones.
So yeah, it's full scale, basically.
And I think the biggest outlier was this one here, 4.9994.
And 5.0001 here so
that's a total spread of seven counts there.
Petty darn heavy with that if I probably left that one a bit longer it might have
settled up a digit or two or something like that.
So yeah, pretty happy with that, seven digit spread max, nice.
And a bunch of them have already turned off and you'll probably start to see
the odd one to do it now, cuz I think the timing should be pretty precise on it.
So you'll see them cascade.
Well, I won't leave it.
But it's very therapeutic to switch them back on.
So yeah you can switch off the order turn off in software,
but [SOUND] I just love pushing buttons.
[SOUND] Magic.
What's even more satisfying than that?
Changing the ranges.
[SOUND] I just check a few more ranges.
I'll check the 500 millivolt range.
There we go.
And bang on so far.
In theory the 500 milivolt range should be a bit tighter than the 5 volts because
you're not relying on the divider resistors,
but because they're all calibrated individually,
individually calibrated ranges, you know, it's arguable.
And sure enough, yeah.
That's a bit tight around.
I think 0.3 was the highest amp.
0.98 so a total spread of five digits.
So, a little bit tighter than here.
Okay, it's weak on resistor standard time.
This is [LAUGH] a $4,000 resistor standard, it's more than good enough for
our purposes here.
And here we go, 10.000, beauty.
Okay, for our 10k here,
it looks like at worse cases 10.002 there are a few of those and 9.999.
So they are total spread over three counts, that's not much at all.
And by the way of course 10k is well under the very
significantly different from the well no sorry 45k for
this range calibration value that would have been caled at.
So the rest of it is the linearity of the IDC and what not.
And on the AC volts a ranger listed five volts at 60 hertz and the spread is much
larger as you'd expect on any AC meter basically because it uses the separate
arm converter chip it's got an inherently larger number of counts and everything.
And the tone I think the worst case was 5.003 to
4.9942 or something, it's in there any way for
a total spread of not point 2%, what's that in count?
60, 90 counts or thereabouts.
The summary are just under a hundred counts, that's spread across all year.
And I think that's quite reasonable.
And as for our currents, so far I don't have enough leads to hook them
all up at once, but there you go, I've got what?
14 or something of them hooked up.
There you go, I think we’ve got like five counts or something between them, maximum.
Not too shabby.
And as for capacitance I can’t bloody well find my reference capacitor can I?
So I’m just going to have to use a crap little thing.
But I have adjusted it for ten nano ferrite and we are getting
ten nano ferrite doesn't have a great resolution there but there you go.
That's pretty tight or is that a coinkydink?
Come on, no no, that's tight, tight as a nun's nasty.
And for those playing along at home, they're shipping with four Duracells.
And they're shipping with a little fuse, FLU 11A, 11 amp fuse, and
the ASTM HV610, which is the one that I use on the BM235, beauty.
And an 8GB SD card cuz these things are probably like dime-a-dozen in Korea.
And because you want to see inside it and
technically I haven't seen inside a actual production meter yet,
there you go I have had a look under the mantis microscope and
the soldering looks no worries whatsoever.
Just get the macro lens out on that for those who do like to play along at home.
There you go.
Beautiful.
Nice fillets, no worries.
All hunky dory.
Beautiful.
Bob's your uncle.
So I haven't actually run the spread of numbers on these things yet, but
I'll do that and I'll include it as an overlay here.
So there you go.
I think I'll call it quits at that.
I don't want to test absolutely every range in every function on these things.
I just want to do a spot check that there's nothing seriously wrong here, and
it seems all hunky dory.
So anyway, I hope you found that interesting.
I gotta go pack and ship these things now.
And unfortunately,
I got them out of the box in the wrong, like I just scattered the boxes.
And the boxes have the serial number card which matches the particular meter,
so I've gotta.
Put everything back together.
Match them up.
Catch you next time.
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