12 Jun
2009
12 Jun
'09
7:42 p.m.
On Jun 12, 2009, at 7:12 AM, Warren Wolfe wrote:
Sure. I'll slap my Simpson 260-6P multimeter on them, and see if
they're about right. <Grin> I don't have access to a cal lab at
this point, Dave...
Hmm, I apparently missed the word "certified" above, and thought
you worked for NIST. Oh well. :)
I was thinking "Fluke" and typed "GR". My DC standard is a Fluke
732A. I'll have a Josephson standard eventually, but not anytime
soon. ;) The Caig stuff is pretty well regarded by the (few) people
I've talked to, and in the papers I've read. I have had good results
with it here.
-Dave
--
Dave McGuire
Port Charlotte, FL
I'm a NIST certified calibration technician.
Umm, whoa! Can I send you some GR standards and my Thomas one-
ohm?? 8-) The amount
of dorking around that is done to get around the
effects of metal junctions, including all solder joints, and the
effects of temperature and humidity, is amazing. Getting great
accuracy is surprisingly difficult.
Yes it really is. I fight with thermals, in particular, all the
time. The copper vs. copper oxide thing drives me nuts; I'm about
to buy stock in Caig.
People were torn over the use of some of the Caig solvents at the
lab. The buggers won't tell you what it is, which makes people
nervous about using them. I don't know what GR standards you mean,
but the Thomas one-ohm probably cost a couple grand, and they're
the LOW end of standards. People get skittish easily.