Best reference after LTZ1000
Look at the cheap voltage references at voltagestandard.com He uses a TI REF50xx chip. He also sells a current reference.
I had a 4.096V reference (that I set to 4.096000V) knocking around in a draw for over a year. I dug it out a couple weeks ago, turned it on, and it said 4.096000V. Not too shabby for 25 bucks.
Mark Sims wrote:
Look at the cheap voltage references at voltagestandard.com He uses
a TI REF50xx chip. He also sells a current reference. I had a 4.096V
reference (that I set to 4.096000V) knocking around in a draw for
over a year. I dug it out a couple weeks ago, turned it on, and it
said 4.096000V. Not too shabby for 25 bucks.
I bought one of his 5 volt references about 2 years ago. I have a pair
of Fluke 8800 5.5 digit voltmeters, at least 30 years old and at least
10 years since a traceable calibration. I had temporarily retired them
because they both needed new filter capacitors in the power supply.
I recently needed them for a project so I replaced the filters, fired
them up, connected that little standard to them and....
5.0000 volts on both meters. And THAT, sports fans, is why I buy Fluke
voltmeters! Oh, and the voltagestandard.com dude makes a GREAT little
reference.
John
--
John DeArmond
Tellico Plains, Occupied TN
http://www.neon-john.com <-- email from here
http://www.johndearmond.com <-- Best damned Blog on the net
PGP key: wwwkeys.pgp.net: BCB68D77
On Sat, Aug 14, 2010 at 03:27:24PM +0000, Mark Sims wrote:
Look at the cheap voltage references at voltagestandard.com ?He uses a TI
REF50xx chip. ?He also sells a current reference.
Thank you. It's interesting!
I think anyway I could reach same (hope better) results with the hardware I
bought. For instance I would try to not put in a trimmer in such a way to
degrade the performance of the reference. Better not trim at all instead.
The only problem is that I lack the opportunity to calibrate what I build
against another reference... I live in Italy and labs and individuals with
adequate instrumentation are not so easy to find...
About the Fluke meters and their lifetime long calibration, I already heard
of this and I could confirm it, but I have just an hand held 177 and it lacks
enough digits to be sure. Wonder if someone has feedback about the drift of
the 34401A (and 34970A that has the same voltmeter inside).
Best regards,
Andrea Baldoni
Ermione s.r.l.
Via Provanone, 9008/D
40014 Crevalcore (BO) - ITALY
PI/VAT IT02745891206
Both Geller and Malone claim you can pick up at least a fixed voltage
reference from them with ppm accuracy at low cost.
http://www.gellerlabs.com/Voltage%20References.htm
http://www.voltagestandard.com/New_Products.html
It won't provide full calibration, but you can at least work off the
ranges applicable to their 5 or 10V reference as calibrated.
At 02:05 PM 8/14/2010, Andrea Baldoni wrote:
On Sat, Aug 14, 2010 at 03:27:24PM +0000, Mark Sims wrote:
Look at the cheap voltage references at voltagestandard.com ?He uses a TI
REF50xx chip. ?He also sells a current reference.
Thank you. It's interesting!
I think anyway I could reach same (hope better) results with the hardware I
bought. For instance I would try to not put in a trimmer in such a way to
degrade the performance of the reference. Better not trim at all instead.
The only problem is that I lack the opportunity to calibrate what I build
against another reference... I live in Italy and labs and individuals with
adequate instrumentation are not so easy to find...
About the Fluke meters and their lifetime long calibration, I already heard
of this and I could confirm it, but I have just an hand held 177 and it lacks
enough digits to be sure. Wonder if someone has feedback about the drift of
the 34401A (and 34970A that has the same voltmeter inside).
Best regards,
Andrea Baldoni
Ermione s.r.l.
Via Provanone, 9008/D
40014 Crevalcore (BO) - ITALY
PI/VAT IT02745891206
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Sincerely,
Marv Gozum
Philadelphia, PA