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Oooh, I got a free multimeter

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slburris:
I recently placed an order with Circuit Specialists, and they send you a free gift
if your order is over $50, so I selected the free multimeter:

http://www.circuitspecialists.com/prod.itml/icOid/8883

So let's see what we got.  I comes in a very nondescript box labeled
"Digital Multimeter".  Looking inside, we see the multimeter itself, probes,
what looks like a temperature probe, and some rectangular thingy with two
probes sticking out.  Hmm, haven't see this before.





Next up is a close up of the multimeter.  It's manual ranging, and claims to
be 1000v Cat I and 600V Cat II.  Although it is has circuitspecialists.com
written on it, it's also labeled MS8264 which leads me to believe that the
OEM is Mastech:

http://www.p-mastech.com/products/04_dm/ms8264.html

But Mastech's site says it's 1000V Cat II and 600V Cat III.  Hmm....



Now a closeup of the rectangular thing which is an adapter for capacitance,
temperature, and Hfe.  Yes, I know I have it plugged in incorrectly.



Scott

migsantiago:
Gratz man!  ;)

slburris:
Now a look at the business end of the multimeter. 

A resettable fuse?  Polyswitches have their uses, but in a multimeter?
And the 10amp circuit isn't fused at all.  I'm not thinking this is a good
meter to use on the mains.



OK, let's look at the PCB.  Main chips is one of those epoxy blob things,
because we certainly wouldn't want to spend the 2cents to put it in
a real IC package.

Look at all those potentiometers!  Not something you see on the higher
end DMMs at all.

Now let's check out the input protection.  There's that polyswitch at the
corner and.....uh.....looking....well, that's about it for input protection.
No MOVs, no real fuses, let alone HRC fuses.  Definitely not going to use this
one on the mains.

You can click on http://electroscott.com/images/dmm6large.JPG for a closer look.



Next up, we'll start testing it, assuming it still works after I put it back together.

Scott

slburris:
Now for some testing.  First up, I fired up my little 5V voltage reference
and connected this meter and the Fluke 87-V to it.  Hmm, well I guess that's
only 0.006% wrong



Now I'm measuring my 500K 0.05% resistance standard on the Fluke.
It says 500.0K :-)



And now the free meter.  Hey, that's within 1 digit, not bad.



Moving on, let's check out a 10uf tantalum capactor.  First on the Fluke.



Now on the free meter.



I think I'll probably take this in to work, just so I have a meter there,
even though we don't do electronics.

Scott

Kiriakos-GR:

--- Quote from: slburris on October 22, 2010, 10:24:09 pm ---

A resettable fuse?  Polyswitches have their uses, but in a multimeter?
And the 10amp circuit isn't fused at all.  I'm not thinking this is a good
meter to use on the mains.


--- End quote ---

Do not worry , make it again in one piece , and I will pay you the shipping so to send it, to me ..

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