Re: Digital Multimeter
Best source of information is the book!
AJ Bouwens, "Digital Instrumentation", Ed. McGraw-Hill.
Its little old book may be out of print but exccelent one on the subject!
Excerpt
Nowadays, an increasing number of electronic measuring instruments are going digital, digital circuitry, digital readout, and digital remote control often being combined in the one instrument. The user of digital equipment has to make the best possible use of the various facilities offered. This book, which deals with these techniques, is divided into three parts. Part 1 "Basic Binary Theory and Logic Circuits," deals with the fundamentals of logic elements. Part 2 "Digital Counters and Timers" discusses the fundamentals of these instruments. Part 3 "Digital Voltmeters and Multimeters," deals with the principle of operation of digital voltmeters (DVMs).