My dad tuned an analog panel volt meter into an ammeter for my solar
system using a resistor shunt and part of a PC Board mounted copper strip
that he incrementally shaved away to calibrate it.
[He's the "Tesla" with the brains, I'm the "Edison" with the persistence
and scrap pile. He talks a lot, incomprehensibly, of Delta Vs and the
like... I listen a little bit. ]
I can fix his broken wrought iron fence. He's no shabby carpenter. I can
re-machine an armature, he can re-wind it.
My DVM goes down to microamps and registered zero while 43 millivolts were
showing on the digital volt meter.
How good is a $7 DVM? Could be a factor.
Ode
At 01:14 PM 8/28/2007 -0500, you wrote:
Evening Ode,
>> At 04:19 AM 8/28/2007, you wrote:
Humm....I've made a mess at 43 millivolts and currents so low I can't
measure them. [took a while]
What would you guess, a few micro amps ?
Small Measurements
A research person, former NASA scientist, wants me to datalog
some current and wattage outputs from some oddball devices.
The current will be a few ma at most.
Most of my input modules have a 0 to 5 volt range. I may be able to set
it lower as they are relatively sophisticated and can be configured with
software, ......... if you communicate with them.
( RS-485 communications )
I thought of using the Meter shunt principle to get some voltage reading,
and then use the software to change this to watts, and then write the data
files.
I use a 10,000 line C program that can do anything imaginable.
Was thinking 1 % resistors would be OK.
Don't want to buy genuine meter shunts of course. I think I could make
them, if I wanted to do so. They are relatively simple as you know. But
1 % resistors are cheap and readily available.
Ode, Dan, or anyone else that has ideas....... please tell me
Wayne
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