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WE PURCHASE AND RECYCLE
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For sale here we have the above…
Temperature range: –40°C ~ +85°C
Capacitance tolerance: ±20% (20°C,120Hz)
Rated voltage: 200 Vdc
Dissipation factor: Less than the value specified in the standard products table. (20˚C,120Hz)
Permissible ripple current: As specified in the standard products table. (85˚C,120Hz)
Capacitance variation : Initial value ±15%
Dissipation factor : 175% of less of specified initial value
Leakage current : Not greater than the specified initial value
Leakage current: 0.02CV (µA) or 3mA, whichever is smaller or less
[C = nominal capacitance (µF), V = rated voltage (V)]
Type HP3 Snap in
Pin pitch 10mm
Pin length 10mm
2000 Hours @ 85’C
Large capacitance high ripple current
Diameter 30mm Length 30mm
For datasheet on HP3 series search…HP32D681MRZ
Or go to…
Please Note! Having been manufactured some years ago these capacitors will almost certainly need reforming. The process of reforming an old aluminium electrolytic capacitor consists of the application of rated voltage, through a resistor, for a period equal to five minutes plus one minute per month of storage.
These capacitors are intended for sale to competent electronic engineers, like all electronic components considerable knowledge and skill is required when using them.
PLEASE DO NOT PURCHASE UNLESS YOU MEET THIS CRITERIA!
Reforming Electrolytic Capacitors
Manufacturers claim that most old electrolytic caps can be saved if the correct procedure is followed, regardless of how long they have been unused. Such capacitors must be “reformed”. This process consists of applying rated voltage through a resistance (about 30,000 ohms, five watt) for five minutes plus one minute for each month of storage (see diagram below). As the capacitor reforms, the voltage across the resistor will drop (measured at the Xs). If that voltage will not drop below 10% of applied voltage after one hour, the capacitor is probably beyond help.
The circuit shown in the sketch above works reasonably well. Apply the rated voltage through a 5W resistor. Anything from 20K-50K will do, as this is far from a precision process. The meter is used to measure the voltage drop across the resistor; when no current is flowing, there will be no drop. Obviously, when there is a large voltage drop (more than 20% of the applied voltage), there must be a significant current flow through the capacitor. The nature of a proper capacitor is to impede DC current flow, so when there is such flow, something must be wrong.
Note: Apply the appropriate D.C. voltage to the capacitor with a D.C. power supply. An old Kepco, Lamba etc. tube regulated lab power supply rig works great. Be sure to observe the proper polarity!
These parts came to us as part of a lot of surplus stock from a large Milspec type Co. and have been kept in storage for some time. They are however in good serviceable condition (may need reforming), the photographs are representative of their general condition, and, as with all our products they come with a full guarantee.
If you have similar items to this, or indeed any electronic components that are surplus to requirements please contact us with details.