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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Interesting to note, that newer A, such as one shown on bbs. ToddlowimpedanceDr. All other conductors within the instrument, as well as the solder employed, contain no metals or junctions that could contribute to thermal emf problems. The single turn pots are wire wound, manufactured by CTS. Keep children and cats away during A service, with no pun intended.
Front panel binding posts soldering job. Faulty Decade A switch 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. Oil-filled main decade A fill port.
Original ones were made of fragile acrylic plastic and cracked already:. If you willing to contribute or add your experience flukd any instruments repairs or provide extra information, you can do so following these simple instructions Exterior and overview Image 1: The KVD Kelvin-Varley Voltage divider incorporates a number of advanced features making for convenience and high performance. 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 720aa work as expected.
| Fluke A Kelvin-Varley Divider restoration
In no event shall the author, xDevs. Later decades only fine-tune resistance of primary resistors in decade A. Markings on rotary switch and resistors If reading correct, date-code on on decade A switch is 6th weekand resistors on A trimmer board are 37th week Flhke particular, the KVD Kelvin-Varley Voltage Divider is especially appropriate for use in bridge circuits, providing two legs of a bridge with a very well known ratio.
None of this cluke happen without great volt-nut community all over the globe. Our unit still have old-style Fluke logo, bit yellowed switches and of course dirty connectors:.
It has a 1. Correct wiring from good F Output terminals are on most right corner.
Fluoe information posted here is hosted just for education purposes and provided AS IS. This reveals that all decade A resistors are wired incorrectly by one position counter-clockwise from switch rear view. Also connection to input and output 720aa posts has got my attention, as soldering does not look very good.
Fluke A Instruction manual. Wiring around decade B Image Resistors R, R and R are checked and well within expected range, so no problem there.
720A Kelvin-Varley Divider
Fluke A Instruction manual Fluke A schematics Instruction manual provide use, calibration 7200a servicing information for the unit. Function switch Take a look on decades more closely.
Later ones are accessible from front panel to implement calibration functionality for decades A and B. That reveals 40 year age of this instrument. The KVD has a resolution of 0. Trim PCB assembly Also connection to input and output binding posts has got my attention, as soldering does not look very good. The unit may be mounted in a standard inch rack. 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.
Maximum voltage and current limits are indicated as well.
It was set to OPER function as received. Bottom side reveals some serious touch on details, with oil-filled resistor chamber for most critical first decade A. It is a highly accurate, stable, and linear primary ratio standard suitable for use in many applications requiring known voltage or current ratios. Credits for help and contributions which make this project possible: There is also little 5K KVD -pot with co-axis fine and coarse adjustment for flukee bridge.
The main switches are sealed. Inside bottom side Bottom side reveals some serious touch on details, with oil-filled resistor chamber for most critical first decade A. Temperature coefficient of linearity is 0. Instruction manual provide use, calibration and servicing information for the unit. This instrument is… Image 7: They are mounted to the case on special Kel-F washers to insure low leakage.
Original ones were made of fragile acrylic plastic and cracked already: On coarse precision levels it may be possible to use this constant linear TCR value, and add simple linear correction. Inside from top side. Of course, reason of why this article is published in repair section very simple. The most significant decade is sealed in an oil bath to minimize temperature coefficient effects.
All operation controls and terminals are located on the front face, making it easy to use. Oil-filled main decade A Hermetic pass-thru terminals, color coded wires, filling port.
The tluke used have gold plated solid silver alloy contacts for long life, minimum contact resistance, and no tarnishing. Input terminals are located at left side near bridge balance pot and operation function switch. Trim and adjustable resistors are outside of oil container, as their performance requirements are not that important.