Morning Marshall,
Maybe you can tell me what I am missing or what I do not understand.
The only reason one measures the current is that he wants
to know the current flow in a specific circuit,
A finite circuit at a specific time and condition.
It may be a changing circuit, possibly a CS batch.
If one starts adding components such as a resistor, no matter the size, he
has changed the circuit, and the reading will be meaningless.
The ratio of the change could be somewhat specific, but in most cases it
will not be. ( actually unknown )
This would be determined by the ratio of the resistance added to the ratio
of the original circuit.
Just because someone made a mistake and connected the meter wrong, is no
need to think they could not still do it correctly.
I hate to see people advising beginners with makeshift methods, half
truths, and encouraging them to
wish, hope and pray, and go around in circles.
Then one year later, or two years later, they will still be confused and
not understand 1 , 1, 1
One Volt, One Ohm, and One AMP.
If they cannot understand that, when it is explained, or study it a few
minutes, then they should Abandon Ship, ASAP.
The only reason I can see to use a known resistor with a current meter is
to test the meter to see if it works.
Any one of us could make a simple drawing, or a picture or two showing how
to connect a volt meter or a current meter.
Likely 10,000 exist on the internet.
Once when installing a production line automation system I built, one of
my men connected a transformer backwards to
480 VAC. When he used the meter, it was destroyed, not beyond repair, but
beyond recognition. He was lucky that he did not loose a finger or two, or
more.
We all know, the higher the voltage, the less forgiving it actually is, to
equipment and to humans.
Maybe I missed the whole point about using the resistor.
>> It is a somewhat derogatory term
Some are transformers, putting out 24 or so volts AC, but most have a
diode bridge in them and a filtering capacitor to supply DC.
I think the term, "Wall Wart" means only one simple thing,
The people who use it have not a clue what they actually have. If they
did, they would use the proper term,
Power supply or Transformer. Plain and simple.
It is one or the other, not a stupid Wall Wart.
I keep a precision 50 AMP meter shunt in my truck. I built it in a nice
plastic box with terminal strips installed on the box.
( for DC )
I can measure 3 amp full scale up to 300 amp full scale relative to AC. No
guessing at anything.
When you work on 480 / 3 phase inverters of 48,000 VA you cannot afford to
guess. 3 battery cabinets, 5 feet tall and 40 feet long each
. Awesome............
Some of the fuses cost $ 20.00 each. I have bought $ 200.00 worth of fuses
before I would go do a service call.
Not exactly Mickey Mouse stuff.
Wayne
======================
Marshall
faith gagne wrote:
What on earth is a wall wart?
Faith G
----- Original Message ----- From: "Clayton Family" <[email protected]>
To: <[email protected]>
Sent: Thursday, December 20, 2007 5:27 PM
Subject: CS>what did I do wrong?
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,
Kathryn
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