--- Mike Monett <[email protected]> wrote:
> If you are using constant voltage, get thee to
> Radio Shack and buy a
> dvm and some resistors.
Thanx for this fine article Mike. I wanted to pass on
a warning about Radio Shacks "true RMS" DVM.( Cat
22-174A) Most DVM's will show just a negative answer
if we hook up the DC amperage connections backwards. (
The normal procedure is connect a positive to a
positive and vice versa.) However this meter MUST be
used in the correct polarity hookups, or it gives an
erroneous answer. An example follows: a reading of
1.35 ma reads .07 ma when hooked in reverse. Also most
unfavorable is the lack of any sensible readings when
using the range selection of 0-4 ma, the smallest DC
range selection. It just plain and simply doesnt work!
The 1.35 ma reading on this example becomes .02 ua, (
thats right micro amps!) when switched to the
appropriate range level. The lowest amp range signal
range will always display with the ua symbol, dont ask
me why? I purchased this meter as the last one on the
shelf, that was sold for a 60% discount. Perhaps
people are bringing them back, saying hey the lowest
range doesnt work properly.
An interesting aspect to this is that apparently
the lowest range reading has a massive "internal
impedance" and as a result of using that range we can
wind up with a current limited situation. If one is
instead using an AC source, and the using 4 diodes as
a full wave rectifier to change the AC to DC, the
follwing experiment readily shows the possibilities.
Put the amperage reading on the AC side of the
circuit, so it reads the current inputed to the
rectification itself. Use the range of 4-400 ma, and
also note the voltage and amperage across the silver
with extra meters. Suppose then that we already have a
set up where less then 4 ma AC input is occuring. Now
switch the range to 0-4 ma, that gives these faulty
readings. One should find as I did that now the
voltage across the coins has been entirely reduced to
a much lower level, and consequently the the lower
voltage means a lowered amperage. A very large voltage
drop across the meter itself occurs when using this
lower range!, presumably because the circuitry on the
lower range setting has a very high internal
impedance. Now if any one else out there has this same
meter they can try this for themselves, and I do not
believe that these results have anything to do with
someone returning an "abused DVM." This is because I
have had more than one of these meters, and each one
had the same problems when making lowest range ma
readings. Another peculiarity of this meter is that it
will not read the voltage across a neon when it is in
range,(200-300 volts AC for a special 4 inch neon
bulb), and trying to do this causes the neon itself to
be extinguished. Their appears to be certain
disadvantages of meter circuitry when it is changed to
reveal the "true rms" values of a signal.
However a possible advantage here is that the high
internal resistance involved in that range might make
it unnecessary to employ resistances in series with
the CS cell. I will later try giving an example of the
meter "induced" current limiting, when I have my setup
put back for CS production. This only involves making
about 4 wiring changes to change from high voltage AC
to low voltage DC.
I was pleasantly surprised to have finally
obtained a gold colored CS. Most of the CS I make is
immediately consumed after production, when then it
appears more as a cloudy silver. But now I am making
the CS in bulk, using 5 (13 oz)cells in parallel, the
last batch was current limited to less then one ma, (
less then 5 ma total for 5 cells in parallel) running
for 12 hours overnight, and I plan another batch
tonight durring the almost full moon. I found that
when the water sits for a few days, then the gold
coloration seems to set in. My freind says, yeah you
must finally be making it right, cause thats what its
supposed to look like!
Sincerely HDN
=====
Tesla Research Group; Pioneering the Applications of Interphasal Resonances
http://groups.yahoo.com/group/teslafy/
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