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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Input terminals are located at left side near bridge flhke pot and operation function switch. Also PCB s are more usual modern green mask type there. Incorrect wiring on decade switch. The main switches are sealed.

All information posted here is hosted just for education purposes and provided AS IS. Gold also allows the use with low level signals.

Schematic section of Decade A network. This device is a fully passive Kelvin-Varley Dividerformed by network of precision ultra-stable wire-wound resistors arranged as voltage divider circuit. Wiring error on decade A.

Fluke A and printed instruction manual. All components in our box are in place, nothing stolen or missing. The front panel is clearly labeled showing step size for each 720q.

Plastic shafts used to rotate decade switches were replaced as well. In no event shall the author, xDevs. But instead we had no connection there: That reveals 40 year age of this instrument. To achieve this ratio, calibrated HP A multimeter will be used. Markings on rotary switch and resistors. Troubleshooting and repair Incorrect wiring flukw Decade A switch Continuity measurements revealed lack of connection from Input terminals to the beginning of Decade A resistor network.

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Inside bottom side Bottom side reveals some serious touch on details, with oil-filled resistor chamber for most critical first decade A. Continuity measurements revealed lack of connection from Input terminals to the beginning of Decade A resistor network. Bottom side reveals some serious touch on details, with oil-filled resistor chamber for most critical first decade A.

A Instruction Manual

Also connection to input and output binding posts has got my attention, as soldering does not look very good. Seven decades with position rotary switch in each allow to set arbitrary division ratio of an input voltage. There are no connectors, vent openings or anything else on sides and rear of the instrument. It is a highly accurate, stable, and 720x primary ratio standard suitable for use in many applications 720x known voltage or current ratios.

The single turn pots are wire wound, manufactured by CTS.

| Testing of Fluke A KVD resistors

The KVD features a built-in Wheatstone bridge self-calibration circuit so that the unit may be calibrated with a minimum of external instruments and without requiring another voltage divider.

Oil-filled main decade A fill port Here comes first trap for young metrologists and precision nuts.

The most significant decade is sealed in an oil bath to minimize temperature coefficient 720aa. On sub-ppm performance levels there are no insignificant details, so great care was taken to guarantee design targets. Perhaps previous failed repair attempt by owner? As was predicted not very long time agocomplete Fluke A standard got into out hands finally.

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None of this would happen without great volt-nut community all over the globe. Here comes first trap for young metrologists and precision nuts.

All operation controls and terminals are located on the front face, making it easy to use. Fluke A front and rear features. Function switch Take a look on decades more closely.

All other conductors within the instrument, as well as the solder employed, contain no metals or junctions that could contribute to thermal emf problems. One of our contributors, Todd sent few photos of something what supposed to be Fluke A, but with very different internals! Front panel binding posts soldering job.

720A Kelvin-Varley Divider

If anyone knows details about this, please share. Close-up on exterior controls and ports.

There are no any active thermal regulation inside A, so Fluke engineers went other way around thermal stability and performance. Fluke A Instruction manual. Disclaimer Redistribution and use of this article or any images or flukr referenced in it, in source and binary forms, with or without modification, ffluke permitted provided that the following conditions are met: Well, our quest with Decade A does not end so quick with only bad wiring, as even after reassembly of wiring properly, divider does circuit does not work as expected.

Correct wiring from good F