Test and Meter Accuracy [RE-wrenches]

[Joel Davidson]

One of the biggest practical jokes on civilization is the digital watch.
What the heck is 6:32PM? Of course, I'm kidding because you need accurate
timing and other things to bring a space shuttle safely back to earth.
Best regards,
Joel Davidson
"White men are strange creatures. They are the only creature that looks at
his wrist to see if he is hungry." Native American Trail Guide.

"Jeffery Wolfe, Global Resource Options" wrote:

> But Joel, my meter has FOUR decimal places!
>
> Jeff
>
> -----Original Message-----
> From: Joel Davidson [mailto:joeldavidson at earthlink.net]
> Sent: Tuesday, February 04, 2003 9:06 PM
> To: RE-wrenches at topica.com
> Subject: Test and Meter Accuracy [RE-wrenches]
>
> My plus/minus 2% meter says 55 volts is somewhere between 53.9 and 56.1
> volts.
> The C40 plus/minus 5% meter says 55 volts is somewhere between 52.25 and
> 57.75 volts.
> Ralph Heisey at Bogart Engineering compared his current reading
> Trimetric and calibrated shunt to his C40 which with a copper wire
> shunt. His C40 meter reads about 15% lower.
> In 1994, Keith Emery at NREL wrote, "When I compare with other
> laboratories a difference of 10% for cells or module is often
> encountered unless we have had substantial interactions to reduce the
> uncertainty.
> The point is don't get hung up on tenths of a volt. You're still going
> to have to fine-tune for best performance.
> Best regards,
> Joel Davidson
> "Gotta go now and catch a plane departing at 6:32PM."
> "6:32? Yeah, sure."
>
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