Test and Meter Accuracy [RE-wrenches]

[Jeffery Wolfe, Global Resource Options]

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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