Re: [volt-nuts] LTZ1000 project build

[Randy Evans]

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 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 application need, where
> compact size and direct output (whatever is coming out of LTZ) were key
> importance. Since modules are part of bigger system with DAC synth,
> specific value, like 7.150 was not important for me.
> C. If there is large enough group to have this project going, I can
> actually modify original design (e.g. for easier hand soldering, or added
> buffer or ratio circuits, onboard LDO, you name it) and get PCBs made for
> interested nuts, at small cost.
>
> You can also find lot of temco/stability data with temperature/environment
> logs with mentioned LTZ modules on my site here:
> https://xdevs.com/services/ in LTZ1000 voltage reference tests section.
> RAW DSV data are available. I still have 3 modules at hand for any
> testing/checks (one was sold while ago, one was installed in HP 3245A
> source to replace LM399).
>
> Illya "TiN" Tsemenko
>
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Re: [volt-nuts] LTZ1000 project build

[ian]

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!..so I know how you feel!

Ian.


- Original 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) 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 application need, where 
compact size and direct output (whatever is coming out of LTZ) were key 
importance. Since modules are part of bigger system with DAC synth, 
specific value, like 7.150 was not important for me.
C. If there is large enough group to have this project going, I can 
actually modify original design (e.g. for easier hand soldering, or 
added buffer or ratio circuits, onboard LDO, you name it) and get PCBs 
made for interested nuts, at small cost.

You can also find lot of temco/stability data with 
temperature/environment logs with mentioned LTZ modules on my site here: 
https://xdevs.com/services/ in LTZ1000 voltage reference tests section. 
RAW DSV data are available. I still have 3 modules at hand for any 
testing/checks (one was sold while ago, one was installed in HP 3245A 
source to replace LM399).

Illya "TiN" Tsemenko

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[volt-nuts] LTZ1000 project build

[Illya Tsemenko]

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 application need, where 
compact size and direct output (whatever is coming out of LTZ) were key 
importance. Since modules are part of bigger system with DAC synth, 
specific value, like 7.150 was not important for me.
C. If there is large enough group to have this project going, I can 
actually modify original design (e.g. for easier hand soldering, or 
added buffer or ratio circuits, onboard LDO, you name it) and get PCBs 
made for interested nuts, at small cost.


You can also find lot of temco/stability data with 
temperature/environment logs with mentioned LTZ modules on my site here: 
https://xdevs.com/services/ in LTZ1000 voltage reference tests section. 
RAW DSV data are available. I still have 3 modules at hand for any 
testing/checks (one was sold while ago, one was installed in HP 3245A 
source to replace LM399).


Illya "TiN" Tsemenko

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Re: [volt-nuts] LTZ1000 project build

[John Phillips]

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 (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-reference-sourcemeter/
>
> With best regards
>
> Andreas
>
>
> Am 25.05.2016 um 17:27 schrieb Eric Garner:
>
>> I ran across this:
>> https://xdevs.com/article/kx-ref/
>>
>> this morning and thought I'd share.
>>
>>
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-- 

*John Phillips*
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