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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Our unit still have old-style Fluke logo, bit yellowed switches and of course dirty connectors: To achieve this ratio, calibrated HP A multimeter will be used. Additional service and repairs Plastic shafts used to rotate decade switches were replaced as well.

Perhaps previous failed repair attempt by owner? Input terminals are located at left side near bridge balance pot and operation function switch.

Fluke A used or new for sale at used-line

This instrument is… Image 7: One of our contributors, Todd sent few photos of something what supposed to be Fluke A, but with very different internals! Fluke A and printed instruction manual.

So essentially, if we skip important construction and design details for sake of simplicity, Fluke A is just a fancy potentiometer. Seven decades with position rotary switch flukd each allow to set arbitrary division ratio of an input voltage.

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Fluke 720A Kelvin Varley Voltage Divider 1604057

Troubleshooting and repair Incorrect wiring on Decade A switch Continuity measurements revealed lack of connection from Input terminals to the beginning of Decade A resistor network. All information posted here is hosted just for education purposes and provided AS IS. Oil-filled main decade A fill port Here comes first trap for young metrologists and precision nuts.

None of this would happen without great volt-nut community all over the globe. All readers are welcome to leave your commends and feedback.

Sticker on the unit. May the Volt be with you. In no event shall the author, xDevs. The switches used have gold plated solid silver alloy contacts for long life, minimum contact resistance, and no tarnishing. ToddlowimpedanceDr. Bottom side reveals some serious touch on details, with oil-filled resistor chamber for most critical first decade A.

720A Kelvin-Varley Divider

Interesting to note, that newer A, such as one shown on bbs. Function switch have many long rotary sections. Also PCB s are more usual modern green mask type there. The KVD Kelvin-Varley Voltage divider employs precision resistors which have been aged, temperature and power cycled to maximize long-term stability, and matched to minimize temperature and power coefficients effects.

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Wiring harness, all fixed in place There is also little 5K KVD -pot with fluek fine and coarse adjustment for balancing bridge. 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: The main switches are sealed.

Incorrect wiring on decade switch.

Fluke A Replacement – KVD Precision Kelvin-Varley Voltage Divider

Inside from top side. Markings on rotary switch and resistors If reading correct, date-code on on decade A switch is 6th weekand resistors on A trimmer 720x are 37th week This device is a fully passive Kelvin-Varley Dividerformed by network of precision ultra-stable wire-wound resistors arranged as voltage divider circuit.

Keep children and cats away during A service, with no pun intended. Bridge power and detector terminals are used for calibration and linearity testing. Fluke A page AN Also connection to input and output binding posts has got my attention, as soldering does not look very good.