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Discussion of precise voltage measurement

Vref experiments

Fred

Mon, Jun 27, 2011 8:49 PM

Just for fun I decided to make some DC volt references. The best one has
a short time drift lower as 1uV, the worst one about 40uV. Long term
drift is hard to say, they are still more or less in open air and
temperature is rather extreme chaniging over here the last days.
The last one I made has the posibiliti to use a 5V low drop regulator
and a + - 12V DC-DC converter so it can be used on batteries too. Short
time drift (over 30 seconds) was after an hour (I just finnished it)
around 5uV I not tested it without the DC DC converter. It must be
better without.

http://www.pa4tim.nl/?p=2531
for pictures and schematics. On the sidebar ,right on the screen, is a
translate button. It is a bit scrappy but I hope it is understandable
(it translates power supply in to food)

Fred PA4TIM

Just for fun I decided to make some DC volt references. The best one has a short time drift lower as 1uV, the worst one about 40uV. Long term drift is hard to say, they are still more or less in open air and temperature is rather extreme chaniging over here the last days. The last one I made has the posibiliti to use a 5V low drop regulator and a + - 12V DC-DC converter so it can be used on batteries too. Short time drift (over 30 seconds) was after an hour (I just finnished it) around 5uV I not tested it without the DC DC converter. It must be better without. http://www.pa4tim.nl/?p=2531 for pictures and schematics. On the sidebar ,right on the screen, is a translate button. It is a bit scrappy but I hope it is understandable (it translates power supply in to food) Fred PA4TIM

Mitch Van Ochten

Tue, Jun 28, 2011 12:42 AM

Hello Fred,

What kind of meter do you use to make the 8 1/2 digit measurements?

Regards,

Mitch Van Ochten

----- Original Message -----
From: "Fred" pa4tim@gmail.com
To: "Discussion of precise voltage measurement" volt-nuts@febo.com
Sent: Monday, June 27, 2011 4:49 PM
Subject: [volt-nuts] Vref experiments

Fred PA4TIM

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Hello Fred, What kind of meter do you use to make the 8 1/2 digit measurements? Regards, Mitch Van Ochten ----- Original Message ----- From: "Fred" <pa4tim@gmail.com> To: "Discussion of precise voltage measurement" <volt-nuts@febo.com> Sent: Monday, June 27, 2011 4:49 PM Subject: [volt-nuts] Vref experiments > Just for fun I decided to make some DC volt references. The best one has > a short time drift lower as 1uV, the worst one about 40uV. Long term > drift is hard to say, they are still more or less in open air and > temperature is rather extreme chaniging over here the last days. > The last one I made has the posibiliti to use a 5V low drop regulator > and a + - 12V DC-DC converter so it can be used on batteries too. Short > time drift (over 30 seconds) was after an hour (I just finnished it) > around 5uV I not tested it without the DC DC converter. It must be > better without. > > http://www.pa4tim.nl/?p=2531 > for pictures and schematics. On the sidebar ,right on the screen, is a > translate button. It is a bit scrappy but I hope it is understandable > (it translates power supply in to food) > > Fred PA4TIM > > > > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.