FLUKE 720A PDF
A. Kelvin-Varley. Voltage Divider. Instruction Manual. P/N mm (8) In the event of failure of a product covered by this warranty, John Fluke Mfg. Co., . The Fluke A Kelvin-Varley Voltage Divider generates V and 11W of power. A models provide an absolute linearity of ppm, a temperature. Find great deals for Fluke A Kelvin Varley Voltage Divider Shop with confidence on eBay!.
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Output terminals are on most right corner. There are no any active thermal regulation inside A, so Fluke engineers went other way around thermal stability and performance.
Keep children and cats away during Fouke service, with no pun intended. On sub-ppm performance levels there are no insignificant details, so great care was taken to guarantee design targets.
Fluke 720A Kelvin Varley Voltage Divider 1604057
If you willing to contribute or add your experience regarding any instruments repairs or provide extra information, you can do so following these simple instructions Exterior and overview Image 1: Few extra photos of wiring and routing around rotary decades. To achieve this ratio, calibrated HP A multimeter will be used. As flu,e predicted not very long time agocomplete Fluke A standard got into out hands finally.
This device is a fully passive Kelvin-Varley Dividerformed by fouke of precision ultra-stable wire-wound resistors arranged as voltage divider circuit. Seven decades with position rotary switch in each allow to set arbitrary division ratio of an input voltage. Of course, reason of why this article is published in repair section very simple.
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If you would like to support us by making a donation please click the Paypal button: Disclaimer Redistribution and use of this article or any images or files referenced in it, in source and binary forms, with or without modification, are permitted provided that the following conditions are met: This instrument is… Image 7: Also PCB s are more usual modern green mask type there. Credits for help f,uke contributions which make this project possible: This instrument will be used in xDevs.
The KVD has a resolution of 0. And as expected, after decade switch replacement unit came back to life. Incorrect wiring on decade switch. High quality gold plated tellurium-copper binding posts serve to minimize the thermal emf effects which would artificially reflect a change in dc resistance measurements.
Wiring around decade B Image Hermetic pass-thru terminals, color coded wires, filling port. Markings on rotary switch and resistors If reading correct, date-code on flukw decade A switch is 6th weekand resistors on A trimmer board 720w 37th week Close-up on exterior controls and ports Of course, reason of why this article is published in repair section very simple.
All other conductors within the instrument, as well as the solder employed, contain no metals or junctions that could contribute to thermal emf problems. ToddlowimpedanceDr.
Fluke A Replacement – KVD Precision Kelvin-Varley Voltage Divider
Our unit still have old-style Fluke logo, bit yellowed switches and of course dirty connectors:. Trim PCB assembly Also connection to input and output binding posts has got my attention, as soldering does not look very good.
The single turn pots are wire wound, manufactured by CTS. Fluke A Instruction manual. Wiring harness, all fixed in place There is also little 5K KVD -pot with co-axis fine and coarse adjustment for balancing bridge. Fluke A flluke printed instruction manual.
Troubleshooting and repair Incorrect wiring on Decade A switch Continuity measurements revealed lack of connection flukd Input terminals to the beginning of Decade A resistor network. If reading correct, date-code on on decade A switch is 6th weekand resistors on A trimmer board are 37th week May the Volt be with you. Maximum voltage and current limits are indicated as well.
Specification summary for Fluke A So essentially, if we skip important construction and design details for sake of simplicity, Fluke A is just a fancy potentiometer. Bridge power 720x detector terminals are used for calibration and linearity testing. All readers are welcome to leave your commends and feedback. That reveals 40 year age of this instrument.