Heathkit MM-1 VOM / Multimeter: History, Overview, Demonstration, Theory

**** See addendum video:
https://youtu.be/sPCeqSZ7vtQ?si=vYtnpdT9Pj8OySMX

In this video documentary, I explore the Heathkit model MM-1 VOM (multimeter) from 1953, which is generally considered to be their first true multimeter, even though their M-1 "Handitester" from 1949 has just as many functions, albeit with lower accuracy and resolution, and fewer ranges.

Here is a timeline table of contents:
00:00 History
03:47 Overview
08:44 Internal views
14:44 Demonstration
25:21 Beauty shot
26:06 Overview of the manual & circuit theory
59:04 Schematic diagram and additional theory

Видео Heathkit MM-1 VOM / Multimeter: History, Overview, Demonstration, Theory канала youtuuba