High Voltage Non-inductive Resistors Welwyn Components W HV L Series Voltage ratings 11 to 67kV Non-inductive printed serpentine design Tolerance down to 0.05% TCR down to 10ppm/C VCR down to -0.04ppm/V Non-magnetic materials RoHS compliant Electrical Data P ower rating at 25C P ower rating at 70C Limiting element voltage in air Limiting element voltage in oil* R es is tance range R es is tance tolerance T CR (25 C to 75 C ) S tandard values Ambient temperature range Ins ulation res is tance at 500V Dielectric s trength of ins ulation watts watts kV kV ohms WHVL2 3.8 2.9 11 22 % ppm/C C ohms V WHVL3 5 3 .8 14 28 WHVL5 7 .5 5 .6 22 44 WHVL7 WHVL10 WHVL12 10 13 .5 16 7 .5 10 12 33 45 54 66 90 108 1K 0 - 100G 10G : 0.05%, 0.1%, 0.25%, 0.5% , 1% , 2% , 5% >10G : 0.25%, 0.5% , 1% , 2% , 5% 10G : 10, 15, 25, 50, 100 >10G : 25, 50, 100 E 24 preferred -55 to +225 >10G >1000 WHVL15 20 15 67 134 * P rotection code P P hys ical Data Dimensions in mm, weight in g T ype L (0.5) L 1 (Max) WHVL2 27 33 .5 WHVL3 37 43 .5 WHVL5 52 58 .5 WHVL7 77 83 .5 WHVL10 102 108 .5 WHVL12 122 128 .5 WHVL15 152 158 .5 D (0.5) f (2) d (0.05) 37 0 .8 8.0 8 .3 8.5 Construction T ermination conductors and ruthenium oxide resistive material are printed in a non-inductive pattern onto the surface of a 96% alumina rod to which termination caps and terminal wires are then attached. T he body of the resistor is then conformally coated either in silicone (protection code C ) or in epoxy (protection code P) . Terminations T he termination wires are gold plated. W t. nom 4.5 6.3 8.1 11.8 15.3 17.7 22.5 L1 d D L f Marking T ype reference, resistance value and tolerance are legend marked. T he resistance value code conforms to IE C 62. Solvent Resistance T he body protection and marking are resistant to all normal industrial clean ing solvents suitable for printed circuits. General Note W elwyn C omponents res erves the right to make changes in product s pecification without notice or liability. All information is s ubject to W elwyn's own tes t data and is cons idered acc urate at time of print. (c) We lwyn C ompone nts L imited W elwyn E lectronics P ark, B edlington, Northumberland, NE 22 7AA, E ngland. T el: 016 70 82218 1 F ax: 01 670 8294 65 W eb: www.welwyn-tt.com 11.09 High Voltage Non-inductive Resistors WHVL Series Performance Data Load at rated power: 1000 hours at 25C Overload: 1.5 x rated power not exceeding LEV for 5 seconds Moisture resistance: MIL Std. 202, method 106 Thermal shock: MIL Std. 202, method 107, condition C Maximum 0.25 0.25 0.25 0.2 R% R% R% R% Typical VCR (ppm/V) WHVL2 <500M: -0.4 500M to 5G0: -0.75 WHVL3 <1G0: -0.2 1G0 to 10G: -0.4 WHVL5 <1G5: -0.15 1G5 to 15G: -0.3 WHVL7 <2G5: -0.1 2G5 to 25G: -0.15 WHVL10 <3G0: -0.08 3G0 to 30G: -0.12 WHVL12 <4G0: -0.06 4G0 to 40G: -0.1 WHVL15 <5G0: -0.04 5G0 to 50G: -0.08 Derating Curve Proportion of Pr (%) Type Typical 0.1 0.1 0.1 0.1 120 100 80 60 40 20 0 0 25 50 75 100 125 150 175 200 225 250 Ambient Temperature (C) Application Notes Due to the high voltage which can appear between the end cap and any adjacent metal part, resistors should be mounted at an adequate distance from other conductors. For some ultra-high voltage applications it is required to immerse the components in oil or SF6 gas or pot them in voidfree silicone compound to reduce corona or surface tracking. The epoxy protection, code P, is suitable for these applications. The axial termination should not be bent closer than twice the diameter of the terminal wire from the resistor body. Ordering Procedure Example: WHVL10 with conformal coat at 100 megohms, 1% tolerance & 50ppm/C TCR: WHVL10CC-100MFB Type Size Protection C P Silicone Epoxy Standard, for use in air Low outgasing, for use in oil or SF6 TCR Y T 15ppm/C 10ppm/C C 50ppm/C D 25ppm/C Z 100ppm/C Value (use IEC62 code) Tolerance (use IEC62 code) W B 0.05% 0.1% C D 0.25% 0.5% F 1% G 2% J 5% Packing B Bulk Pack General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn's own test data and is considered accurate at time of print. (c) We lwyn C ompone nts L imited Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com 11.09