Model 720A Kelvin-Varley
Der Fluke Model 720A
Reference Voltage Divider ist ein stabiler und hochgenauer Spannungsteiler
für Kalibrationszwecke. Mit sieben Dekaden erreicht er eine Auflösung von 0.1ppm.
The Instruction Manual (48MB pdf file) can be downloaded from the
manufactorer website, consists of all technical
specification written in detail. The manual shows also measurement applications using this instrument.
Rob from the
Nederlands sent the photos from this fine instrument, thank you very
much for supporting the website.
"The unit was probably made in early 1971; the 'youngest' date-code I
could find on any resistor is week 45 of 1970. It has,
in the past been repaired, since a couple of trimmers are much newer
(1986) than the rest. You can see this in the picture
"internals topside"; there is a row of trimmers on the bottom, two of
which are a lot brighter in colour".