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.
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: Here comes first trap for young metrologists and precision nuts. 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.
If you would like to support us by making a donation please click 7220a Paypal button: In no event flke the author, xDevs.
Inside from top side. There is also little 5K KVD -pot with co-axis fine fluje coarse adjustment for balancing bridge. Instruction manual provide use, calibration and servicing information for the unit. There are no connectors, vent openings or anything else on sides and rear of the instrument.
Wiring error on decade A. Resistors R, R and R are checked and well within expected range, so no problem there. Markings on rotary switch and resistors. Little board with beautiful Fluke-made teal resistors mounted just above the oil tank from the top side. Oil-filled main decade A fill port. Bottom side reveals some serious touch on details, with oil-filled resistor chamber for most f,uke first decade A.
Rluke reveals 40 year age of this instrument. All components in our box are in place, nothing stolen or missing. Maybe except screw or two… Internal switch for calibration for third decade.
Trim PCB assembly Also connection to input and output binding posts has got my attention, as soldering does not look very good. Oil-filled main decade A. Function switch Take a look on decades more closely. Specification flyke for Fluke A So essentially, if we skip important construction and design details for sake of simplicity, Fluke A is just a fancy potentiometer.
Fluke A Kelvin Varley Voltage Divider | eBay
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 flkke provided that the following conditions are met: Wiring around decade B. Bridge balance pot and trimmers accessible from fluuke panel. The front panel is clearly labeled showing step size for each decade.
The single turn pots are wire wound, manufactured by CTS. Output voltage and division ratio was within 4. Markings on rotary switch and resistors If reading correct, date-code on on decade A switch is 6th weekand resistors on A trimmer fluje are 37th week Fluke A page AN None of this would happen without great volt-nut community all over the globe.
Teardown So now as we confirmed my unit is broken, time to remove covers and see what is inside.
720A Instruction Manual
On sub-ppm performance levels there are no insignificant details, so great care was taken to guarantee design targets. ToddlowimpedanceDr.
Faulty Decade A switch Well, our quest with Decade A does not end so quick with only bad flu,e, as even after reassembly of wiring properly, divider does circuit does not work as expected.
Later decades only fine-tune resistance of primary resistors in decade A. The KVD Kelvin-Varley Voltage divider incorporates a number of advanced features making for convenience and high flhke. Original ones were made of fragile acrylic plastic and cracked already:.
Correct wiring from 72a0 F Of course, reason of why this article is published in repair section very simple. It has a 1. It was set to OPER function as received. Incorrect wiring on decade switch. Wiring around decade B Image This instrument will be used in xDevs. But instead we had no connection there: The unit may be mounted in a standard inch rack.
If reading correct, date-code on on decade A switch is 6th weekfulke resistors on A trimmer board are 37th week One of our contributors, Todd sent few photos of something what supposed to be Fluke A, but with very different internals! This device is a fully passive Kelvin-Varley Dividerformed by network fluuke precision ultra-stable wire-wound resistors arranged as voltage divider circuit.
Our unit still have old-style Fluke logo, bit yellowed switches and of course dirty connectors: