"The Model 8400A Digital Voltmeter is a versatile instrument with five full decades of digits plus a sixth digit for 20% overrange. Its mainframe accepts a family of analog and system options that may be installed in the field at any time, in any sequence, for expansion from a bench DVM into a full system multimeter.

Fluke's Recirculating-Remainder (Patent Pending) A/D conversion technique is used in the 8400A. This conversion circuitry periodically samples the input and serially digitizes the sample, providing a reliable DVM with long-term accuracy and linearity plus superior environmental characteristics." (Fluke, Manual 8400A, 1971-1974)

BRIEF SPECS