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National Stock Number:
5905-01-321-7788
Federal Supply Class:
5905
National Item Identification Number:
013217788
Description:
RESISTOR,VARIABLE,HYBRID
Detail:
A RESISTOR IN WHICH A SLIDING OR ROLLING CONTACT MOVES OVER AN EXPOSED AREA OF THE RESISTIVE ELEMENT. UNIFORM CONTACT PRESSURE ON THE RESISTANCE ELEMENT IS MAINTAINED BY POSITIVE PRESSURE TO PERMIT SMOOTH ELECTRICAL AND MECHANICAL CONTROL OF THE RESISTOR OVER THE ENTIRE RESISTANCE RANGE. THE RESISTIVE ELEMENT IS CONSTRUCTED OF A COMBINATION OF TWO MATERIALS USUALLY CONSISTING OF A WIREWOUND ELEMENT WITH A COATING OF CONDUCTIVE PLASTIC APPLIED OVER THE RESISTANCE WIRE WHERE THE SLIDER MAKES CONTACT. MAY BE CONSTRUCTED OF A SINGLE OR MULTITURNS OF WIRE SUPPORTED ON AN INSULATING STRUCTURE ON WHICH THE WIPER CONTACTS THE COATED WIRE CONTINUOUSLY IN THE DIRECTION OF WIPER TRAVEL. THE OPPOSITION TO THE FLOW OF CURRENT IS AN INHERENT PROPERTY OF THE WIRE USED AND IS MANIFESTED IN THE HEAT DISSIPATED IN THE RESISTOR ITSELF. FOR ITEMS HAVING MANUALLY POSITIONED TAPS DESIGNED TO BE SET AND FIXED PRIOR TO USE, SEE RESISTOR, ADJUSTABLE. FOR ITEMS WITH STEP BY STEP VARIATION, SEE RHEOSTAT; AND RESISTOR, STEP BY STEP. FOR TANDEM-MOUNTED ITEMS DESIGNED TO FUNCTION TOGETHER AS AN ATTENUATOR (AND RATED ACCORDINGLY), SEE ATTENUATOR, VARIABLE. EXCLUDES OTHER RESISTOR (1), VARIABLE, (AS MODIFIED).
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Manufacturer Information:
| 276842-21 | 73138 | BI TECHNOLOGIES CORPORATION | | 7609-1702-0 | 73138 | BI TECHNOLOGIES CORPORATION |
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Techincal Specification:
| BODY STYLE | CYLINDRICAL SERVO MOUNTED | | MOUNTING FACILITY QUANTITY | 3 | | MOUNTING METHOD | THREADED HOLE(S) | | MOUNTING HOLE/STUD CIRCLE DIAMETER | 1.250 INCHES NOMINAL | | MOUNTING LIP DEPTH | 0.0670 INCHES MAXIMUM | | MOUNTING LIP DIAMETER | 2.0000 INCHES MAXIMUM | | PILOT DIAMETER | 0.7500 INCHES MAXIMUM | | PILOT LENGTH | 0.0670 INCHES MAXIMUM | | SCREW THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) | | SCREW THREAD DIAMETER | 8.000 INCHES NOMINAL | | SCREW THREAD QUANTITY PER INCH | 32.0 | | SPECIAL FEATURES | NICHROME 5 WIRE,POWER RATING 5 WATTS,PLUS 5 PERCENT RESISTANCE TOLERANCE,.025 PERCENT LINEARITY TOLERANCE,STAINLESS STEEL SHAFT,CLOCKWISE ROTATION OF SHAFT,MOISTURE AND FUNGUS RESISTANCE | | UNDERCUT DIAMETER | 1.815 INCHES MINIMUM AND 1.825 INCHES MAXIMUM | | UNDERCUT WIDTH | 0.0670 INCHES MAXIMUM |
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