Series Welwyn Components Working voltage 100kV Resistances d
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High Voltage Precision Thick Film Resistors
Series
Welwyn Components
Working voltage 100kV Resistances down 25ppm Termination variants Sets resistors with matched characteristics
Electrical Data
Power rating 20°C Resistance range Limiting element voltage Resistance tolerance Values Thermal impedance Ambient temperature range °C/watt watts ohms volts ppm/°C preferred values 100K Values 250ppm/°C Closer tolerances over restricted range value special order Notes
Physical Data
Dimensions (mm) Weight mounting centres 31.8 57.2 156.4 Bend Radius 18.5 19.3 20.2 T44TU T44KU T44D
Type T43D T44D T48D T43KU T44KU T48KU T43TU T44TU T48TU
25.4 50.8 150.0 30.2 53.2 152.2 32.6 55.6 154.8
32.0 32.0 32.0 32.0 32.0 32.0
General Note
Welwyn Components reserves right make changes product specification without notice liability. information subject Welwyn's data considered accurate time going print. subsidiary electronics Issue 03.02
Welwyn Components Limited Bedlington, Northumberland NE22 7AA,
Telephone: 1670 822181 Facsimile: 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
High Voltage Precision Thick Film Resistors
Series
Construction
ruthenium oxide based resistive film fired onto surface high quality former. Turned brass caps fitted. Helical made into film adjust resistive value finally protective sleeve fitted provide mechanical protection electrical insulation. Resistors SF6, supplied with lacquer protection instead sleeve. Solderability:
Welwyn Components
terminations meet requirements 115-1, Clause 4.17.3.2.
Screw Terminations: Styles Material: Screw Thread: Turned brass. caps tapped deep. TPI, 60°C thread angle, 4.72±0.07 outside diameter, 3.83 core diameter. resistors supplied with long screwed brass studs.
Terminations
Three styles termination available permit resistors screwed together series chain, with members having axial wires soldering. Wire Terminations: Styles standard terminations available upon request. Material: Strength: Solder coated copper wire. terminations meet requirements 68.2.21 Coupling Stud:
Marking
Type reference, resistance value, tolerance date code legend marked. resistance value conforms
Solvent Resistance
lacquer protective sleeve provide excellent resistance normal industrial cleaning solvents suitable printed circuits.
Performance Data
Maximum Load rated power: 1000 hours 20°C Shelf life: months room temperature Derating from rated power 20°C Noise decade frequency) Voltage coefficient resistance µV/V ppm/V IG:3, >IG:5 Zero 150°C <2.5 Typical
Matched Sets
Matched sets supplied precision voltage dividers. These screwed together form sticks and, selecting type termination, wire connection provided each stick. Enquiries welcomed special resistors sets when resistor length, operating voltage resistance value outside catalogued range.
When resistors required potted, preferred encapsulant silicone compound. voltage dividers with resistance section below minimum available value normal practice Welwyn resistor, Series, obtainable down ohm.
Immersion
some high voltage applications required immerse components reduce effects corona surface tracking. special lacquer protected version resistor available, suitable immersion transformer SF6.
Application Notes
high voltage which appear between adjacent metal part, resistors should mounted adequate distance from other conductors. appropriate number resistors screwed together stick provide assembly which will capable withstanding desired voltage, providing individual resistor subject greater stress power dissipation than recommended this data sheet, that appropriate anticorona devices fitted. axial termination should bent closer than twice diameter terminal wire from body resistor.
Packaging
Resistors supplied packed boxes.
Standard Quantities
Types
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, Telephone: 1670 822181 Facsimile: 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
Issue 03.02
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