[volt-nuts] Calibration of voltage standards --- DIY switch/scannors

张利民 lmz at dhc.com.cn
Mon Feb 16 01:45:56 EST 2015

Hi M K,

Sorry about that, I have posted a new thread on EEVBLOG with added photos.


>发件人: volt-nuts [mailto:volt-nuts-bounces at febo.com] 代表 M K
>发送时间: 2015年2月13日 14:45
>收件人: volt-nuts at 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-bounces at febo.com] 代表 Ken Peek
>>> 发送时间: 2015年2月12日 1:35
>>> 收件人: volt-nuts at 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.
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