On Sat, 20 Dec 2014 22:17:57 +0100
Joel Setton wrote:
> I wasn't aware of the degraded long-term drift performance in the
> plastic packages, as compared to the metal can. I'm surprised they can't
> protect the chip from package-induced effects!
Well, that's where physics strikes back... and e
On 20 Dec 2014 21:18, "Joel Setton" wrote:
>
> Jan,
>
> Thanks for a good summary f the pros/cons. Of course the LTZ1000 is much
closer to the current state of the art, but the REF102 is far easier to use
and to calibrate. I'm definitely not shooting for sub-ppm performance, if I
can build anythin
I believe the 1281 uses the LTZ1000. The datasheet mentions dual references.
My 4920 has both a ltz1000 and a lm399. I think you can find pics of the
1281 dual ref setup on eevblog.
I would not be surprised if the 8508a has a similar configuration.
Todd
On Saturday, December 20, 2014, Richard M
Jan,
Thanks for a good summary f the pros/cons. Of course the LTZ1000 is much
closer to the current state of the art, but the REF102 is far easier to
use and to calibrate. I'm definitely not shooting for sub-ppm
performance, if I can build anything that stays within (say) 20 ppm
long-term, th
The Datron 1081/1082 are 7-1/2 digit meters. The zeners are two pair of two
zeners in series to get the ref voltage up high enough. In the two 1081s I had,
they worked quite well, ref’d to the two Fluke 732As I had at the time. But not
8-1/2 digit grade, I don’t think. I have no idea what the 1
The Datron 1081 used 4 zener diodes
Regards
Frans
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On 19/12/2014 22:13, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
On 19 Dec 2014 19:30, "Jan Fredriksson" wrote:
It's no coincidence that virtually all 8.5 digit DMMs use the LTZ1000.
It's in a class of it's own.
What do the 8.5 digit meters use if they don't use the LTZ1000?
Dave.
Well th
On 19 Dec 2014 19:30, "Jan Fredriksson" wrote:
>
> It's no coincidence that virtually all 8.5 digit DMMs use the LTZ1000.
> It's in a class of it's own.
What do the 8.5 digit meters use if they don't use the LTZ1000?
Dave.
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It's no coincidence that virtually all 8.5 digit DMMs use the LTZ1000.
It's in a class of it's own. REF102 is not in the same class, even if
you average a handful.
But there are a couple of nice things about the REF102, though for
more moderate requirements
- You get a reference at 10V, +/-0.0025V
Guys,
Thanks for your comments! The idea is to use a simple resistor averaging
network, as shown in Fig. 14 of the REF102 datasheet.
I hadn't thought of the effect of relative humidity, would the
temperature-controlled enclosure at (say) 50C/122F change things in this
respect?
One nice thing a
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On 18 Dec 2014 19:06, "Poul-Henning Kamp" wrote:
>
>
> In message <5492f59e.8060...@free.fr>, Joel Setton writes:
>
> >In my search for the Perfect Volt, I'm thinking about building a
> >reference voltage generator which would average the voltages generated
> If you want to do it "right"
In message <5492f59e.8060...@free.fr>, Joel Setton writes:
>In my search for the Perfect Volt, I'm thinking about building a
>reference voltage generator which would average the voltages generated
>by 8 or 10 REF102CP chips (with a simple resistor network), mounted in a
>temperature-co
Hello,
I would expect a stability of around 10-15 ppm over one year after 6-12
months run in time.
The reason is that with the plastic package all references will have
about the same change in the order of 0.5ppm/% rH change.
So assumption is that you have maximum 30% rH change over one year.
Folks,
In my search for the Perfect Volt, I'm thinking about building a
reference voltage generator which would average the voltages generated
by 8 or 10 REF102CP chips (with a simple resistor network), mounted in a
temperature-controlled box.
Among all the experts on this list, does anyone ha
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