This whole discussion does not really apply to the LTZ1000 circuit, that
is the bare 7.15..V output, w/o step up amplifier, as all drift
parameters were attenuated by orders of magnitude, depending on the
resistors, R1-R5.
In the eevblog thread, several volt-nuts measured the real dependency,
Poul-Henning wrote:
Only thing to remember is that it also reduces air circulation in the
box and therefore increases thermal gradients.
The starting point is a sensitive circuit, which I would put in a
close-fitting, fully shielded box in any case. So even if it weren't
quasi-hermetically
On 4 Jun 2016 20:44, "Poul-Henning Kamp" wrote:
>
>
> In message <57527f8a.6070...@yandex.com>, Charles Steinmetz writes:
>
> >As I have mentioned before, for many years I have put precision circuits
> >that may be sensitive to humidity into gasketed metal boxes with fresh
> >silica gel p
In message <57527f8a.6070...@yandex.com>, Charles Steinmetz writes:
>As I have mentioned before, for many years I have put precision circuits
>that may be sensitive to humidity into gasketed metal boxes with fresh
>silica gel packets. I have opened some of these after 2 and 3 decades,
Lars wrote:
if you have a completely sealed box with varying temperatures the
> relative humidity in the box changes if the humidity is not close to
zero.
As I have mentioned before, for many years I have put precision circuits
that may be sensitive to humidity into gasketed metal boxes with
febo.com"
> Betreff: Re: [volt-nuts] LTZ1000 project build
>
>
> My experience is that boxes makes the time constants for humidity longer but
> does not take it away. Heating in boxes takes the change due to humidity down
> a little but it doesn´t go away. I have
Could this be caused by ionic contamination of the printed circuit
board? The quick test I have used for this is to blow on the board
with a straw.
In extreme cases solving it usually involved dropping the board into
an ultrasonic cleaner with water and a bit of dish soap or TSP, then a
rinse in
o:i...@ianjohnston.com>
Skickat: den 3 juni 2016 20:42
Till: volt-nuts@febo.com<mailto:volt-nuts@febo.com>
Ämne: Re: [volt-nuts] LTZ1000 project build
Hi,
The product I designed to use the 2ppm/degC resistors is sealed in an
enclosure where the LM399AH etc live, so I don't expect
inal Message -
From: Illya Tsemenko [mailto:il...@xdevs.com]
To: volt-nuts@febo.com
Sent: Thu, 26 May 2016 18:42:54 +0800
Subject: [volt-nuts] LTZ1000 project build
I'm glad my little project got so much attention. Worth to mention few
points regarding my (or any other LTZ1000)
;
volt-nuts@febo.com<mailto:volt-nuts@febo.com>
Ämne: Re: [volt-nuts] LTZ1000 project build
Hi all,
TiN, out of interest I spent ages fishing for low ppm/degC resistors for my own
reference..ended up with 2ppm units from DigiKey. Yes, they are expensive
and send the BOM into the clouds!.
Hello,
I monitor two DIY LTZ1000 references, standard circuit from LT
datasheet, since about 7 years.
These are running on 45°C, and are using 5 precision wirewound resistors
(PWW), T.C. ~0.2 .. 4ppm/K.
BOM cost are currently 42.85$ for the LTZ1000 (non A!!) directly from LT
(recommended, be
Fixed the graphs. There was function in JS to plot only last 60 days of
data, I forgot about it.
Some graphs take bit of time to load, especially on mobile devices. I'm
not great on software programming, sorry.
27/05/16 0:45, Randy Evans пишет:
Illya,
Very interesting. The temco/stability da
Illya,
Very interesting. The temco/stability data does not plot but the X-Y
format seems to be OK. Is it supposed to plot or do I have to plot it
myself with the csv data?
Thanks,
Randy Evans
On Thu, May 26, 2016 at 3:42 AM, Illya Tsemenko wrote:
> I'm glad my little project got so much at
[mailto:il...@xdevs.com]
To: volt-nuts@febo.com
Sent: Thu, 26 May 2016 18:42:54 +0800
Subject: [volt-nuts] LTZ1000 project build
I'm glad my little project got so much attention. Worth to mention few
points regarding my (or any other LTZ1000) unit:
A. One should consider cost of whol
I'm glad my little project got so much attention. Worth to mention few
points regarding my (or any other LTZ1000) unit:
A. One should consider cost of whole BOM, not only LTZ chip. In my case
resistors from VPG exceed cost of LTZ1000 by far.
B. PCB I designed was targeted best to my own applica
On 26/05/2016 06:59, John Phillips wrote:
What prices are you seeing for 100 LTZ1000s?
The main thing is they need to be cooked in then sorted for stability.
A good data acquisition system used to do stats on all the units would
really help.
On Wed, May 25, 2016 at 10:17 PM, Andreas Jahn
wrote:
What prices are you seeing for 100 LTZ1000s?
The main thing is they need to be cooked in then sorted for stability.
A good data acquisition system used to do stats on all the units would
really help.
On Wed, May 25, 2016 at 10:17 PM, Andreas Jahn
wrote:
> Hello,
>
> there are further projects (i
Hello,
there are further projects (including measurement results of Illya = TiN)
in this thread:
http://www.eevblog.com/forum/metrology/ultra-precision-reference-ltz1000/
and others in the metrology/projects section of eevblog
http://www.eevblog.com/forum/projects/project-kx-diy-calibrator-re
If you build these you need to build several and age them together and see
how the members drift against the population. After 6 months or so you
should be able to tell which ones are stable and weed out any drifters.
On Wed, May 25, 2016 at 6:42 PM, bownes wrote:
>
> As Dr K said, traceable and
Heck, if you’re going to make one, you might as well make one GREAT.
I would be interested in doing a 4910 version, so to speak. Four in one
thermal box and the ability to use them independently or summed and averaged.
Similar to the Fluke 730a, I think? Oh, and one of them must be removable
As Dr K said, traceable and usefully calibrated are not necessarily connected.
I can calibrate to any arbitrary standard I like. That standard need not be
traceable if all that is important to me is consistency across all the
instruments in my lab.
If I, on the other hand, want to be consis
On 25 May 2016 at 19:24, Russ Ramirez wrote:
> A lot of great information Eric, thanks for sharing the link.
>
> Due to my ignorance in general on the subject of Metrology, I have the
> following question for the list.
>
> If one built a project with the LTZ1000, like the one described on xDevs
>
A lot of great information Eric, thanks for sharing the link.
Due to my ignorance in general on the subject of Metrology, I have the
following question for the list.
If one built a project with the LTZ1000, like the one described on xDevs
and could set it to a value of 7.1500v at the NIST lab
I ran across this:
https://xdevs.com/article/kx-ref/
this morning and thought I'd share.
--
--Eric
_
Eric Garner
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