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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Front panel binding posts soldering job. As usual with performance checks and testing, reference standard must fluoe at least 2 better more times better uncertainty that DUT. Instruction manual provide use, calibration and servicing information for the unit.
Wiring around decade B. But instead we had no connection there:. Continuity measurements revealed lack of connection from Input terminals to the beginning of Decade A resistor network.
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. They are mounted to the case on special Kel-F washers to insure low leakage. One of our contributors, Todd sent few photos of something what supposed to be Fluke A, but flu,e very different internals! Also PCB s are more usual modern green flhke type there.
There is also little 5K KVD -pot with co-axis fine and coarse adjustment for balancing bridge.
720A Kelvin-Varley Divider
Bridge balance pot and trimmers accessible from front panel. ToddlowimpedanceDr. All operation controls and terminals are located on the front face, making it easy to use. Hence oil fill help to keep all resistors of decade same even with quick change in input voltage and dissipated power. Credits for help and contributions which make this project possible: Wiring error on decade A.
Later ones are accessible from front panel to implement calibration functionality for decades A and B. There are no connectors, vent openings or anything else on sides and rear of the instrument. Fluke A page AN Wiring around decade B Image 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.
Oy East Trade Promotion Ltd – Fluke A Kelvin-Varley Voltage Divider
Troubleshooting and repair Incorrect wiring on Decade A switch Continuity measurements revealed lack of connection from Input terminals to the beginning 7220a Decade A resistor network.
Original ones were made of fragile acrylic plastic and cracked already:. Oil-filled main decade A fill 70a Here comes first trap for young metrologists and precision nuts. Little board with beautiful Fluke-made teal resistors mounted just above the oil tank from the top side. Seven decades with position rotary switch in each allow to set arbitrary division ratio of an 720 voltage. But instead we had no connection there: All information posted here is hosted just for education purposes and provided AS IS.
It is a highly accurate, stable, and linear primary ratio standard suitable for use in many applications requiring known voltage or current ratios.
720A Instruction Manual
Maybe except screw or two… Internal switch for calibration for third decade. None of this would happen without great volt-nut community all over the globe. Internal calibration switch Little board with beautiful Fluke-made teal resistors mounted just above the oil tank from the top side. The unit may be mounted in a standard inch rack.
This device is a fully passive Kelvin-Varley Dividerformed by network of precision ultra-stable wire-wound resistors arranged as voltage divider circuit. All components in our box are in place, nothing stolen or missing. Our unit still have old-style Fluke logo, bit yellowed switches and of course dirty connectors: Additional service and repairs Plastic shafts used to rotate decade switches were replaced as well.
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. Plastic shafts used to rotate decade switches were replaced as well.
Fluke A Kelvin Varley Voltage Divider | eBay
Markings on rotary switch and resistors. Hermetic pass-thru terminals, color coded wires, filling port. Fluke A Instruction manual.
Fluke A front and rear features. Teardown So now as we confirmed my unit is broken, time to remove covers and see what is inside. Gold also allows the use with low level signals.