Traveling Standard

I have several voltmeters in my lab, and like the man with two clocks who never knows what time it is, I have meters that give different answers.

In order to resolve this problem I want to build a Traveling Standard (TS) that I can send out to be measured by other volt nuts with better meters than I own.

Here is the first message I posted about a TS to the volt-nuts mail list.

I was very pleased with the responses I got back, which included this one. What a great reply - it gave me lots to thing about.

Here are my design notes.

A proposed TS protocol.

I have posted some pictures as the unit is developed, along with some plots of the voltage versus time and temperature

The detailed schematic is attached to this page.

The measurements reported by Volunteer 1, taken from 2012-01-04 through 2012-01-08, are attached to this page.