Ref: http://escribe.com/health/thesilverlist/m59090.html
>CS>Current limiting by low range setting of RS "true rms" DVM's
>From: Harvey Norris
>Date: Sat, 17 May 2003 15:26:49
> As formerly refered to, this is Radio Shacks expensive meter, cat
> 23-174A.
[...snip long rambling incoherent description]
I have many dvm's from different manufacturers, including HP,
Keithley, Fluke, and several different ones from Radio Shack,
including the previous True RMS model, Micronta cat 22-181B.
I also bought the Radio Shack 23-174A, but returned it the next day.
It drifted badly, and it seemed to be a completely different
internal design. Newer is not necessarily better, and I think they
blew it on that particular model.
You do not need a True RMS meter to work with CS. There are many
inexpensive Radio Shack dvm's that are suitable.
Unfortunately, you need to check the instrument carefully to ensure
it is working properly. Someone else may have returned it after
damaging it, and Radio Shack simply puts it back on the shelf. I
would not buy an instrument from EBay for the same reason.
There are many other suitable dvm's as well. WallMart, Home Depot,
and other stores carry inexpensive models that should work fine.
Harbor Freight frequently has good deals, and is mentioned often in
the list archives. Go to their home page and enter "multimeter" in
the keyword search box:
http://www.harborfreight.com/
Be sure to get a multimeter that measures current, preferably down
to microamperes (0.2 mA = 200 uA.)
It is convenient to have two so you can measure current and voltage
simultaneously. But it is not really necessary, especially if you
have some form of current regulation.
Make sure you add a resistor in series with the battery or power
supply. This will eliminate the chance of blowing the fuse.
You can also use the resistor to stabilize the current, as discussed
in my previous posts. It is not needed with constant current
generators, such as the LM117/317 or LM324.
Again, be sure to check the meter carefully to make sure it is
functioning properly. You might have problems returning a defective
one, since many sales personnel have no idea how it should work and
cannot tell if it is bad. Make sure you have the right to return it
if you are not satisfied. But also be careful to not buy one that
has been opened. Someone else may have damaged it.
Harvey, I'm afraid I really cannot follow the rest of your post. You
really don't seem to have a grasp of what you are talking about, and
as soon as you mentioned the full moon in connection with making cs,
I lost interest.
As far as using coins to make cs, they are difficult to mount,
soldering may increase the risk of contaminating the cs with lead or
copper, it is difficult to get uniform current on both sides of the
coin so you lose effective wetted area, and they are quite small.
I would take the coins and use them to buy plain 0.999 silver wire.
Best Regards,
Mike Monett
--
The silver-list is a moderated forum for discussion of colloidal silver.
Instructions for unsubscribing may be found at: http://silverlist.org
To post, address your message to: [email protected]
Silver-list archive: http://escribe.com/health/thesilverlist/index.html
List maintainer: Mike Devour <[email protected]>
