High Voltage High Voltage Welwyn Components Thick Film Resistors Thick Film Resistors F Series F Series · Working voltage up to 28kV Working voltage up to 28kV • · Resistance up to 150G Resistance up to 150G • · Termination variants Termination variants • · Sets supplied with matched characteristics · Good ratio matching over wide voltage range Sets supplied with matched characteristics • Good ratio matching over wide voltage range • Electrical Data F43 F44 Notes Power rating watts 0.7 1.3 Resistance range ohms 2M to 100G 2M to 150G Limiting element voltage volts 4K 14K In air volts 8K 28K In oil TCR 20° - 70°C ppm/°C -2000 Resistance tolerance % 2, 5, 10 Measured at 100 volts dc Standard values E24 preferred Any value to special order Thermal impedance °C/watt 44 33 Ambient temperature range °C -55 to 100 Physical Data Dimensions (mm) & Weight (g) PCB Min. mounting Bend F44D Type L max D max f min d nom centres Radius Wt. nom d D L F43D 25.4 8.4 32.0 0.8 31.8 1.2 3.1 f F44D 50.8 8.4 32.0 0.8 57.2 1.2 5.6 F43KU 30.2 8.5 32.0 0.8 3.9 F44TU F44KU F44KU 53.2 8.5 32.0 0.8 7.4 L L F43TU 32.6 8.5 5.8 F44TU 55.6 8.5 8.2 General Note General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. TT electronics reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn’s own data and is considered accurate at time of going to print. A subsidiary of All information is subject to TT electronics’ own data and is considered accurate at time of going to print. TT electronics plc www.bitechnologies.com www.irctt.com www.welwyn-tt.com © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com Issue B · 03.02 © TT electronics plc 08. 11 201 High Voltage High Voltage High Voltage Thick Film Resistors Thick Film Resistors Thick Film Resistors F Series Welwyn Components Welwyn Components F F S Se erriie es s Screw Terminations: Styles TU and KU Construction Screw Terminations: Styles TU and KU Construction ® ® The Cermetox thick film is fired on to the surface of a high The Cermetox thick film is fired on to the surface of a high Material: Turned brass Material: Turned brass quality ceramic former. Turned brass end caps are fitted. A quality ceramic former. Turned brass end caps are fitted. A Screw Thread: All caps are tapped UNF - 10 x 4.2 Screw Thread: All caps are tapped UNF - 10 x 4.2 helical cut is made into the film to adjust its ohmic value and helical cut is made into the film to adjust its ohmic value and deep. UNF - 10 is 32 TPI, 60° thread deep. UNF - 10 is 32 TPI, 60° thread finally a sleeve is fitted to provide mechanical protection and finally a sleeve is fitted to provide mechanical protection and angle 4.72 ±0.07 mm outside diameter, angle 4.72 ±0.07 mm outside diameter, electrical insulation. Resistors for use in oil SF6 can be electrical insulation. Resistors for use in oil SF6 can be 3.83 mm core diameter. 3.83 mm core diameter. supplied with a lacquer protection instead of the sleeve. supplied with a lacquer protection instead of the sleeve. Coupling Stud: All KU & TU resistors are supplied with Coupling Stud: All KU & TU resistors are supplied with 8 mm long screwed brass studs. Terminations 8 mm long screwed brass studs. Terminations Marking Three styles of termination are available to permit resistors to Marking Three styles of termination are available to permit resistors to Type reference, resistance value, tolerance and date code are be screwed together in a series chain, with the end members Type reference, resistance value, tolerance and date code are be screwed together in a series chain, with the end members legend marked. The resistance values conform to IEC 62. having axial wires for soldering. legend marked. The resistance values conform to IEC 62. having axial wires for soldering. Solvent Resistance Wire Terminations: Styles D and KU Solvent Resistance Wire Terminations: Styles D and KU The lacquer and protective sleeve provide excellent resistance Non standard wire terminations The lacquer and protective sleeve provide excellent resistance to all normal industrial cleaning solvents suitable for printed Non standard wire terminations available upon request. to all normal industrial cleaning solvents suitable for printed circuits. available upon request. Material: Solder coated copper wire circuits. Material: Solder coated copper wire Strength: The terminations meet the requirements Strength: The terminations meet the requirements of IEC 68.2.21. of IEC 68.2.21. Solderability: The terminations meet the requirements Solderability: The of IEC terminations 115-1, Clause meet 4.17.3.2. the requirements of IEC 115-1, Clause 4.17.3.2. Performance Data Performance Data Maximum Typical Load at rated power: 1000 hours at 20°C ∆R% 5 1 Maximum Typical Shelf life: 12 months at room temperature ∆R% 0.5 Load at rated power: 1000 hours at 20°C ∆R% 5 1 Derating from rated power at 20°C Zero at 100°C Shelf life: 12 months at room temperature ∆R% 0.5 Noise (µV/V in a decade of frequency) <2.5 Derating from rated power at 20°C Zero at 100°C Voltage coefficient of resistance ppm/V <25 Noise (µV/V in a decade of frequency) <2.5 Voltage coefficient of resistance ppm/V <25 Application Notes Mounting Application Notes Matched Sets Due to the high voltage which can appear between the end Matched sets can be supplied for use as voltage dividers. Mounting cap and any adjacent metal part, resistors should be mounted Matched Sets These may be screwed together to form sticks and, by Due to the high voltage which can appear between the end at an adequate distance from other conductors. Matched sets can be supplied for use as voltage dividers. selecting the KU type of termination, a wire connection can cap and any adjacent metal part, resistors should be mounted These may be screwed together to form sticks and, by be provided at each end of the stick. Resistors may be screwed together to provide an assembly at an adequate distance from other conductors. selecting the KU type of termination, a wire connection can which will be capable of withstanding any desired voltage, Enquiries are welcomed for special resistors and sets when be provided at each end of the stick. Resistors may be screwed together to provide an assembly providing no individual resistor is subjected to a greater stress resistor length, operating voltage or resistance vale is outside which or power will dissipation be capable than of withstanding is recommended any desir in this ed data voltage, sheet. Enquiries are welcomed for special resistors and sets when the catalogued range. providing no individual resistor is subjected to a greater stress resistor length, operating voltage or resistance vale is outside For some high voltage applications it is required to immerse or power dissipation than is recommended in this data sheet. Packaging the catalogued range. the components in oil or gas to reduce the effects of corona All components are supplied in boxes. and surface tracking. A special lacquer is available, suitable For some high voltage applications it is required to immerse Packaging for immersion in transformer oil of SF6. the components in oil or gas to reduce the effects of corona Standard Quantities Per Box All components are supplied in boxes. and surface tracking. A special lacquer is available, suitable When resistors are required to be potted, the preferred All Types 10 or 20 per box for immersion in transformer oil of SF6. Standard Quantities Per Box encapsulant is a silicone compound. When resistors are required to be potted, the preferred All Types 10 or 20 per box For voltage dividers with a low resistance section below the encapsulant is a silicone compound. minimum available value of an F43 resistors, it is entirely suitable to use an RC Series resistor, available down to 1 ohm. For voltage dividers with a low resistance section below the minimum available value of an F43 resistors, it is entirely suitable © Welwyn to use Components an RC Series Limited resistor Bedlington, , available Northumberland down to NE22 1 ohm. 7AA, UK General Note Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com Issue B · 03.02 TT electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT electronics’ own data and is considered accurate at time of going to print. 202 www.bitechnologies.com www.irctt.com www.welwyn-tt.com © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com Issue B · 03.02 © TT electronics plc 08. 11 202 High Voltage High Voltage Thick Film Resistors Thick Film Resistors F Series Welwyn Components F Series Ordering Procedure Example: F44 wire-ended and sleeved at 4.7 gigohms and 5% tolerance - F 4 4 D – 4 G 7 J I Type Termination D Wire / wire KU Wire / screw TU Screw / screw Protection Lacquered & Sleeved H Lacquered only (for use in oil or SF ) 6 Value (use IEC62 code) Tolerance (use IEC62 code) G 2% J 5% K 10% Packing I Box 10 or 20/box Standard General Note TT electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT electronics’ own data and is considered accurate at time of going to print. www.bitechnologies.com www.irctt.com www.welwyn-tt.com © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK © TT electr Telephone: +44 onics plc (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com Issue B · 03.02 08. 11 202