On 16/02/2015 06:45, 张利民 wrote:
Hi M K,
Sorry about that, I have posted a new thread on EEVBLOG with added photos.
http://www.eevblog.com/forum/projects/diy-low-thermal-emf-switchscanner-for-comparisons-of-voltage-and-resistor-stand/
lymex/bg2vo
-----邮件原件-----
发件人: volt-nuts [mailto:volt-nuts-boun...@febo.com] 代表 M K
发送时间: 2015年2月13日 14:45
收件人: volt-nuts@febo.com
主题: Re: [volt-nuts] Calibration of voltage standards
On 13/02/2015 01:40, 张利民 wrote:
Dear Ken Peek,
I designed a powerless automatic 2*4 low thermal EMF switch for 3458A, 34401A
and 34420A(works also on my R6581T and 1281). It performs great and I use it as
my main comparison tool for 10V and 10k standards.
http://bbs.38hot.net/thread-1186-1-1.html
lymex/bg2vo
-----邮件原件-----
发件人: volt-nuts [mailto:volt-nuts-boun...@febo.com] 代表 Ken Peek
发送时间: 2015年2月12日 1:35
收件人: volt-nuts@febo.com
主题: Re: [volt-nuts] Calibration of voltage standards
I forgot to mention that I also own a PPM Inc. Model AVM-100 null meter.
Works great on AC but I need to replace the NiCd batteries for it to
work on batteries. It has a 1uV scale, and it is a bit noisy on that
scale. I intend to modify it to get batter 1/f noise specs on the 1uV
scale.
Does anyone know where I can get [or how to make] a low-thermal-EMF
switch [or relay]? This would need to be a DPDT type to be able to
reverse the connection to the meter. Ideas?
Hi Lymex,
Great idea. I will have to spend some time looking over the google
translate version of your text, as unfortunately it seems that here in
the United Kingdom we cannot see any in line images from 38hot. I guess
I would have to sign up to see them? And even the video of your box
would not stream for me.
Hi Lymex,
Amazing lab you have there. Thanks.
M K
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