LOL!
Last time I dead shorted something was maybe 15 years ago when I was
installing a new elec box behind my stove. That was a stupid thing to
do too. Then I kept on resetting the circuit breaker until I broke
that! I finally called the electrician to come out and tell me where I
went wrong (and I don't mean in my childhood). Sometimes my brain just
goes on vacation, I have no excuse.
I replaced the fuse and my meter works again. That's good- I guess I
quit while I was not too far behind, I didn't fry the whole unit. I am
glad I asked.
The wall wart says it is a class 2 power supply, input 120V AC 60hz 20
w, output 24V DC 500mA. I did not realize there was a difference in
those small units used to power all kinds of gadgets around the house.
I have not looked at them closely. I thought transformers were more for
high voltage applications, like neon signage and such. I do have one of
those too, but they scare me.
My regular 3 battery setup works fine. I was trying to see where to set
the potentiometer to keep the current controlled with an AC to DC power
supply. I just looked at my meter, and it says right on it the max for
that setting is 400mA. Darn it. If I hook it up to the other lead, it
will measure up to 10A, so I guess that is the way to go, then when I
get the pot. set, so the current is low, maybe then I can move the lead
to the other side.
Kathryn
On Dec 20, 2007, at 6:41 PM, Wayne Fugitt wrote:
Kathryn,
I can't believe you wrote that message. <grin>
You had me fooled. I though you was a tech of sorts.
>>At 05:31 PM 12/20/2007, you wrote:
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.
The really good meters have a fuse in the current part of the
meter. Even then, you should know the range of your current meter and
the amount of current in the circuit you wish to measure. They are
easily replaceable by the user.
If you add the resistor as was suggested, the reading will be
worthless anyway. Sounds like this is all to complicated for you.
Maybe you should forget the whole smear. Current measurement is not
for everyone. Measuring the current in a CS batch is not like
measuring the maximum current of a power supply or transformer. You
need to learn a few terms, the right one.
A wall wart is not an acceptable term. You do not know if you have a
power supply or a transformer.
At least you stated, 24 V. another worthless term.
Wayne
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