Simpson 260-1 VOM/Multimeter: History, Repair, Overview, Demonstration, Theory

**** See addendum video:
   • Vintage VOM Rectifier Circuits: A Rat...  

In this video, I describe a piece of classic electrical test equipment, the original version of the venerable Simpson 260 VOM (multimeter) which dates from the early 1900's. Then I demonstrate it, give an overview of the original users manual and schematic, then describe the circuit theory using my CAD re-drawn schematic.

I also present my efforts to replicate some original battery labels, and others who have needed to replace the original cells & batteries on these, using modern equivalents, might wish to apply these so their meters look more period-authentic internally.

The new schematic and label PDF files may be downloaded here:
https://www.serpentwebsite.com/filesh...

Here is a timeline table of contents for this video:
00:00 History & Overview
05:30 Making new batteries
08:18 Internal views
17:54 Retro battery labels
26:08 Demonstration
39:28 Beauty shot
39:44 Comparison with a more recent Simpson 260 Series 8 meter
44:00 Overview of the Simpson manual
52:55 Schematic diagram & circuit theory