[volt-nuts] Calibration of voltage standards

张利民 lmz at dhc.com.cn
Thu Feb 12 20:40:27 EST 2015

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.

>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
>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?
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