[sdiy] Trying to establish confidence in my test equipment

[Tim Daugard]

From: "Benjamin Riggs" <ben.r at iinet.net.au>

> Ok a volt is a volt is a volt to as many decimal places as you like,
same
> with amps and ohm. When I'm doing stuff at home (cause my equipment
is not
> calibrated), I pretend volts are now apples, my current is oranges
and
> resistance is apricots. Then I can do my own calculations.

I was surprised recently to discover a volt is not a volt. When I
started electronics, the volt was a basic unit. I checked on the US
NIST website and discovered that an amp and an ohm are basic units.
The volt is a derived unit. So to calibrate to those standards, all it
takes is a calibrated resistor and a calibrated current source.

Tim Daugard
AG4GZ 30.4078N 86.6227W Alt: 12 feet above MSL
http://home.sprintmail.com/~daugard/synth.htm