Voltage variation

Roy Smith wrote:
In article ,
wrote:
If the JPI is coming out soon, it might be interesting to pull the
other meter as well. Connect both of them to a 12 V battery sitting
on a table - with the same gauge and lengths of wire - and see what
they read.

The bench test sounds fine, but the same gauge and lengths of wire part
is kind of silly.

Quite possibly. However, if I _don't_ say that, somebody will try this
test with jumper cables for one meter and two 500 foot spools of 30 gauge
wire for the other meter, and then write me an indignant email when they
buy a new meter and its reading still doesn't match the other one.

As for a reference voltage source, any reasonable DVM you can buy at
Radio Shack fo $20 will be more than accurate enough for this kind of
work.

Precision is cheap. Accuracy costs a little more.

Matt Roberds