Re: Is my DMM broken (cannot read current)?
- From: "Phil Allison" <philallison@xxxxxxxxxx>
- Date: Mon, 25 Jun 2007 15:03:30 +1000
"Martin Cote"
Hi, I just bought a cheap DMM (Elenco M-1000C), and I believe that the
low-range current reader is broken.
The DMM has a 10A plug, which seems to work properly (it shows reasonable
results in high-current circuits). However, switching to the mA plug
doesn't seem to work at all. It always shows me 0mA when I'm expecting
9mA (the range is set to 20mA).
Also, when I use the 10A plug, a LED of my circuit lights up when I make
the contact. It doesn't with the 20mA range.
Am I doing something wrong with the low-range current reader? I really
think the DMM is not functionning properly, but I would like to know what
you guys think.
** Even the cheapest DMMs have a fuse for the 200mA range.
Open it up and have a look - expect to see a 20 x 5mm, 0.5 A fuse.
......... Phil
.
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