On 12/20/2007 5:27:45 PM, Clayton Family ([email protected]) wrote:
> Dear Esteemed and Learned List Members,
>
> I was fooling around with a wall wart that is listed as 24V and 500mA,
> and had it hooked up in series with my radioshack multimeter. It tested
> as 30.6V, and after I switched it to mA, the meter failed. Now it just
> reads micro volts and
> won't read anything else. Dang! Maybe I had it
> on micro amps instead of milliamps, and would that break it?
>
> I need another multimeter! But I don't
> want to just turn around and
> break this one too.
>
> Thanks,
Yup! You blew it.
An ammeter across a voltage source is a dead short.
With luck, if you open it up, you'll find a blown fuse.
Harbor Freight often puts mmeters on sale for $2 or $3, but that won't
help you in the land of Oz.
I like to monitor current by measuring the voltage across a 1000 ohm
resistor in series with one of the circuit leads.
It's readout will be the equivilant current in milliamps.
Chuck
Balance the budget--declare politicians a game species
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