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page 1/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com for the electronic measurement of current: dc, ac, pulsed..., with galvanic separation between the primary and the secondary circuit. features closed loop (compensated) multi-range current transducer voltage output single supply compact design for pcb mounting. advantages very low temperature coeffcient of offset very good d v /d t immunity higher creepage distance / clearance reduced height reference pin with two modes: ref in and ref out extended measuring range for unipolar measurement. applications ac variable speed and servo motor drives static converters for dc motor drives battery supplied applications uninterruptible power supplies (ups) switched mode power supplies (smps) power supplies for welding applications solar inverters. standards en 50178: 1997 iec 60950-1: 2006 iec 61010-1: 2010 iec 61326-1: 2012 ul 508: 2010. application domain industrial. current transducer cksr series i pn = 6, 15, 25, 50 a ref: cksr 6-np, cksr 15-np, cksr 25-np, cksr 50-np n97.e7.09.000.7, n97.e7.15.000.7, n97.e7.19.000.7, n97.e7.25.000.7
page 2/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com absolute maximum ratings stresses above these ratings may cause permanent damage. exposure to absolute maximum ratings for extended periods may degrade reliability. ul 508: ratings and assumptions of certifcation file # e189713 volume: 2 section: 1 standards csa c22.2 no. 14-10 industrial control equipment - edition 11 - revision date 2011/08/01 ul 508 standard for industrial control equipment - edition 17 - revision date 2010/04/15 ratings conditions of acceptability when installed in the end-use equipment, consideration shall be given to the following: 1 - these devices must be mounted in a suitable end-use enclosure. 4 - cksr series intended to be mounted on the printed circuit wiring board of the end-use equipment (with a minimum cti of 100). 5 - cksr series shall be used in a pollution degree 2. 8 - low voltage circuits are intended to be powered by a circuit derived from an isolating source (such as transformer, optical isolator, limiting impedance or electro-mechanical relay) and having no direct connection back to the primary circuit (other than through the grounding means). 11 - cksr series: based on results of temperature tests, in the end-use application, a maximum of 100c cannot be exceeded at soldering joint between primary coil pin and soldering point (corrected to the appropriate evaluated max. surrounding air). marking only those products bearing the ul or ur mark should be considered to be listed or recognized and covered under ul's follow-up service. always look for the mark on the product. parameter symbol unit value supply voltage u c v 7 primary conductor temperature t b c 110 maximum primary current i p max a 20 i pn eds rating, human body model (hbm) u esd kv 4 parameter symbol unit value primary involved potential v ac/dc 1000 max surrounding air temperature t a c 105 primary current i p a according to series primary currents secondary supply voltage u c v dc 7 output voltage v out v 0 to 5 cksr series
page 3/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com insulation coordination parameter symbol unit value comment rms voltage for ac insulation test, 50 hz, 1 min u d kv 4.3 impulse withstand voltage 1.2/50 s ? w kv 8 partial discharge extinction rms voltage @ 10 pc u e v 1000 clearance (pri. - sec.) d ci mm 8.2 shortest distance through air creepage distance (pri. - sec.) d cp mm 8.2 shortest internal path along device body case material - - v0 according to ul 94 comparative tracking index cti v 600 application example - - 300 v cat iii pd2 reinforced insulation, non uniform feld according to en 61010 application example - - 600 v cat iii pd2 reinforced insulation, non uniform feld according to en 50178 application example - - 1000 v cat iii pd2 simple insulation, non uniform feld according to en 50178 environmental and mechanical characteristics parameter symbol unit min typ max comment ambient operating temperature t a c -40 105 ambient storage temperature t s c -55 105 mass m g 9 cksr series
page 4/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com electrical data cksr 6-np at t a = 25 c, u c = + 5 v, n p = 1 turn, r l = 10 k? internal reference unless otherwise noted (see min, max, typ. defnition paragraph in page 13). parameter symbol unit min typ max comment primary nominal rms current i pn a 6 apply derating according to fg. 25 primary current, measuring range i pm a -20 20 number of primary turns n p 1,2,3,4 supply voltage u c v 4.75 5 5.25 current consumption i c ma ) ( n ma i s p 15 + ) ( n ma i s p 20 + n s = 1731 turns reference voltage @ i p = 0 a v ref v 2.495 2.5 2.505 internal reference external reference voltage v ref v 0 4 output voltage v out v 0.375 4.625 output voltage @ i p = 0 a v out v v ref electrical offset voltage v oe mv -5.3 5.3 100% tested v out - v ref electrical offset current referred to primary i oe ma -51 51 100% tested temperature coeffcient of v ref tcv ref ppm/k 5 50 internal reference temperature coeffcient of v out @ i p = 0 a tcv out ppm/k 6 14 ppm/k of 2.5 v -40 c .. 105 c (at 6 sigma) theoretical sensitivity g th mv/a 104.2 625 mv/ i pn sensitivity error g % -0.7 0.7 100% tested temperature coeffcient of g tcg ppm/k 40 -40 c .. 105 c linearity error l % of i pn -0.1 0.1 magnetic offset current (10 i pn ) referred to primary i om a -0.1 0.1 output rms current noise (spectral density) 100 hz .. 100 khz referred to primary i no a/hz ? 20 r l = 1 k? peak-peak output ripple at oscillator frequency f = 450 khz (typ.) - mv 40 160 r l = 1 k? reaction time @ 10 % of i pn t ra s 0.3 r l = 1 k?, d i /d t = 18 a / s step response time to 90 % of i pn t r s 0.3 r l = 1 k?, d i /d t = 18 a / s frequency bandwidth ( 1 db) bw khz 200 r l = 1 k? frequency bandwidth ( 3 db) bw khz 300 r l = 1 k? overall accuracy x g % of i pn 1.7 overall accuracy @ t a = 85 c (105 c) x g % of i pn 2.2 (2.4) accuracy x % of i pn 0.8 accuracy @ t a = 85 c (105 c) x % of i pn 1.4 (1.6) cksr series
page 5/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com electrical data cksr 15-np at t a = 25 c, u c = + 5 v, n p = 1 turn, r l = 10 k? internal reference unless otherwise noted (see min, max, typ. defnition paragraph in page 13). parameter symbol unit min typ max comment primary nominal rms current i pn a 15 apply derating according to fg. 26 primary current, measuring range i pm a -51 51 number of primary turns n p 1,2,3,4 supply voltage u c v 4.75 5 5.25 current consumption i c ma ) ( n ma i s p 15 + ) ( n ma i s p 20 + n s = 1731 turns reference voltage @ i p = 0 a v ref v 2.495 2.5 2.505 internal reference external reference voltage v ref v 0 4 output voltage v out v 0.375 4.625 output voltage @ i p = 0 a v out v v ref electrical offset voltage v oe mv -2.21 2.21 100% tested v out - v ref electrical offset current referred to primary i oe ma -53 53 100% tested temperature coeffcient of v ref tcv ref ppm/k 5 50 internal reference temperature coeffcient of v out @ i p = 0 a tcv out ppm/k 2.3 6 ppm/k of 2.5 v -40 c .. 105 c (at 6 sigma) theoretical sensitivity g th mv/a 41.67 625 mv/ i pn sensitivity error g % -0.7 0.7 100% tested temperature coeffcient of g tcg ppm/k 40 -40 c .. 105 c linearity error l % of i pn -0.1 0.1 magnetic offset current (10 i pn ) referred to primary i om a -0.1 0.1 output rms current noise (spectral density) 100 hz.. 100 khz referred to primary i no a/hz ? 20 r l = 1 k? peak-peak output ripple at oscillator frequency f = 450 khz (typ.) - mv 15 60 r l = 1 k? reaction time @ 10 % of i pn t ra s 0.3 r l = 1 k?, d i /d t = 44 a / s step response time to 90 % of i pn t r s 0.3 r l = 1 k?, d i /d t = 44 a / s frequency bandwidth ( 1 db) bw khz 200 r l = 1 k? frequency bandwidth ( 3 db) bw khz 300 r l = 1 k? overall accuracy x g % of i pn 1.2 overall accuracy @ t a = 85 c (105 c) x g % of i pn 1.5 (1.7) accuracy x % of i pn 0.8 accuracy @ t a = 85 c (105 c) x % of i pn 1.2 (1.3) cksr series
page 6/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com electrical data cksr 25-np at t a = 25 c, u c = + 5 v, n p = 1 turn, r l = 10 k? internal reference unless otherwise noted (see min, max, typ. defnition paragraph in page 13). parameter symbol unit min typ max comment primary nominal rms current i pn a 25 apply derating according to fg. 27 primary current, measuring range i pm a -85 85 number of primary turns n p 1,2,3,4 supply voltage u c v 4.75 5 5.25 current consumption i c ma ) ( n ma i s p 15 + ) ( n ma i s p 20 + n s = 1731 turns reference voltage @ i p = 0 a v ref v 2.495 2.5 2.505 internal reference external reference voltage v ref v 0 4 output voltage v out v 0.375 4.625 output voltage @ i p = 0 a v out v v ref electrical offset voltage v oe mv -1.35 1.35 100% tested v out - v ref electrical offset current referred to primary i oe ma -54 54 100% tested temperature coeffcient of v ref tcv ref ppm/k 5 50 internal reference temperature coeffcient of v out @ i p = 0 a tcv out ppm/k 1.4 4 ppm/k of 2.5 v -40 c .. 105 c (at 6 sigma) theoretical sensitivity g th mv/a 25 625 mv/ i pn sensitivity error g % -0.7 0.7 100% tested temperature coeffcient of g tcg ppm/k 40 -40 c .. 105 c linearity error l % of i pn -0.1 0.1 magnetic offset current (10 i pn ) referred to primary i om a -0.1 0.1 output rms current noise (spectral density) 100 hz.. 100 khz referred to primary i no a/hz ? 20 r l = 1 k? peak-peak output ripple at oscillator frequency f = 450 khz (typ.) - mv 10 40 r l = 1 k? reaction time @ 10 % of i pn t ra s 0.3 r l = 1 k?, d i /d t = 68 a / s step response time to 90 % of i pn t r s 0.3 r l = 1 k?, d i /d t = 68 a / s frequency bandwidth ( 1 db) bw khz 200 r l = 1 k? frequency bandwidth ( 3 db) bw khz 300 r l = 1 k? overall accuracy x g % of i pn 1 overall accuracy @ t a = 85 c (105 c) x g % of i pn 1.35 (1.45) accuracy x % of i pn 0.8 accuracy @ t a = 85 c (105 c) x % of i pn 1.15 (1.25) cksr series
page 7/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com electrical data cksr 50-np at t a = 25 c, u c = + 5 v, n p = 1 turn, r l = 10 k? internal reference unless otherwise noted (see min, max, typ. defnition paragraph in page 13). parameter symbol unit min typ max comment primary nominal rms current i pn a 50 apply derating according to fg. 28 primary current, measuring range i pm a -150 150 number of primary turns n p 1,2,3,4 supply voltage u c v 4.75 5 5.25 current consumption i c ma ) ( n ma i s p 15 + ) ( n ma i s p 20 + n s = 966 turns reference voltage @ i p = 0 a v ref v 2.495 2.5 2.505 internal reference external reference voltage v ref v 0 4 output voltage v out v 0.375 4.625 output voltage @ i p = 0 a v out v v ref electrical offset voltage v oe mv -0.725 0.725 100% tested v out - v ref electrical offset current referred to primary i oe ma -58 58 100% tested temperature coeffcient of v ref tcv ref ppm/k 5 50 internal reference temperature coeffcient of v out @ i p = 0 a tcv out ppm/k 0.7 3 ppm/k of 2.5 v -40 c .. 105 c (at 6 sigma) theoretical sensitivity g th mv/a 12.5 625 mv/ i pn sensitivity error g % -0.7 0.7 100% tested temperature coeffcient of g tcg ppm/k 40 -40 c .. 105 c linearity error l % of i pn -0.1 0.1 magnetic offset current (10 i pn ) referred to primary i om a -0.1 0.1 output rms current noise (spectral density) 100 hz .. 100 khz referred to primary i no a/hz ? 20 r l = 1 k? peak-peak output ripple at oscillator frequency f = 450 khz (typ.) - mv 5 20 r l = 1 k? reaction time @ 10 % of i pn t ra s 0.3 r l = 1 k?, d i /d t = 100 a / s step response time to 90 % of i pn t r s 0.3 r l = 1 k?, d i /d t = 100 a / s frequency bandwidth ( 1 db) bw khz 200 r l = 1 k? frequency bandwidth ( 3 db) bw khz 300 r l = 1 k? overall accuracy x g % of i pn 0.9 overall accuracy @ t a = 85 c (105 c) x g % of i pn 1.2 (1.3) accuracy x % of i pn 0.8 accuracy @ t a = 85 c (105 c) x % of i pn 1.1 (1.3) cksr series
page 8/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com typical performance characteristics cksr 6-np figure 1: linearity error figure 2: frequency response figure 3: step response figure: 4 step response figure 5: input referred noise figure 6: d v/ d t -0 . 1 -0 . 0 5 0 0 . 0 5 0 . 1 -6 0 6 i p (a ) linear i ty e rro r (% o f i p n ) -1 -0 . 8 -0 . 6 -0 . 4 -0 . 2 0 0 . 2 0 . 4 0 . 6 0 . 8 1 100 1000 10000 100000 1000000 f r e que n c y (h z) r e l a t i ve s e n s i t i v i t y ( d b ) -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 ph ase ( ) r e l a t i v e sens i t i v i t y phas e i p = 6 a -1 0 1 2 3 4 5 6 7 -0 . 5 0 0 . 5 1 1 . 5 2 t ( s ) i p (a ) 2 . 4 2 . 5 2 . 6 2 . 7 2 . 8 2 . 9 3 . 0 3 . 1 3 . 2 v out (v) i p = 6 a v out i p -1 0 1 2 3 4 5 6 7 -2 0 2 4 6 8 1 0 t ( s ) (a ) 2 . 4 2 . 5 2 . 6 2 . 7 2 . 8 2 . 9 3 . 0 3 . 1 3 . 2 v out (v) i p = 6 a i p i p v out 0 . 1 1 1 0 100 1000 10000 1 . e + 1 1 . e + 2 1 . e + 3 1 . e + 4 1 . e + 5 1 . e + 6 1 . e + 7 f r e que n c y (h z) i no ( a / h z ? ) -800 -600 -400 -200 0 200 400 600 800 -1 0 1 2 3 4 5 t ( s ) pr i m a r y volta g e v p (v) 2 . 4 2 . 6 2 . 8 3 . 0 3 . 2 3 . 4 3 . 6 v out (v) 20 k v / s v out v ref ref v p cksr series
page 9/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com typical performance characteristics cksr 15-np figure 7: linearity error figure 8: frequency response figure 9: step response figure 10: step response figure 11: input referred noise figure 12: d v/ d t -0 . 1 -0 . 0 5 0 0 . 0 5 0 . 1 -1 5 0 1 5 i p (a ) linear i ty e rro r (% o f i p n ) -1 -0 . 8 -0 . 6 -0 . 4 -0 . 2 0 0 . 2 0 . 4 0 . 6 0 . 8 1 100 1000 10000 100000 1000000 f r e que n c y (h z) r e l a t i ve s e n s i t i v i t y ( d b ) -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 ph ase ( ) r e l a t i v e sens i t i v i t y phas e i p = 15 a -2 . 5 0 2 . 5 5 7 . 5 1 0 12. 5 1 5 17. 5 -0 . 5 0 0 . 5 1 1 . 5 2 t ( s ) (a ) 2 . 4 2 . 5 2 . 6 2 . 7 2 . 8 2 . 9 3 . 0 3 . 1 3 . 2 v out (v) i p = 15 a i p i p v out -2 . 5 0 2 . 5 5 7 . 5 1 0 12. 5 1 5 17. 5 -2 0 2 4 6 8 1 0 t ( s ) i p (a ) 2 . 4 2 . 5 2 . 6 2 . 7 2 . 8 2 . 9 3 . 0 3 . 1 3 . 2 v out (v) i p = 15 a i p v out 0 . 1 1 1 0 100 1000 10000 1 . e + 1 1 . e + 2 1 . e + 3 1 . e + 4 1 . e + 5 1 . e + 6 1 . e + 7 f r e que n c y (h z) i no ( a / h z ? ) i -800 -600 -400 -200 0 200 400 600 800 -1 0 1 2 3 4 5 t ( s ) pr i m a r y volta g e v p (v) 2 . 4 2 . 6 2 . 8 3 . 0 3 . 2 3 . 4 3 . 6 v out (v) 20 k v / s v ref v out v p cksr series
page 10/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com typical performance characteristics cksr 25-np figure 13: linearity error figure 14: frequency response figure 15: step response figure 16: step response figure 17: input referred noise figure 18: d v/ d t -0 . 1 -0 . 0 5 0 0 . 0 5 0 . 1 -2 5 0 2 5 i p (a ) linear i ty e rro r (% o f i p n ) -1 -0 . 8 -0 . 6 -0 . 4 -0 . 2 0 0 . 2 0 . 4 0 . 6 0 . 8 1 100 1000 10000 100000 1000000 f r e que n c y (h z) r e l a t i ve s e n s i t i v i t y ( d b ) -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 ph ase ( ) r e l a t i v e sens i t i v i t y phas e i p = 25 a -4 . 2 0 . 0 4 . 2 8 . 3 12. 5 16. 7 20. 8 25. 0 29. 2 -0 . 5 0 0 . 5 1 1 . 5 2 t ( s ) i p (a ) 2 . 4 2 . 5 2 . 6 2 . 7 2 . 8 2 . 9 3 . 0 3 . 1 3 . 2 v out (v) i p = 25 a v out i p 0 . 1 1 1 0 100 1000 10000 1 . e + 1 1 . e + 2 1 . e + 3 1 . e + 4 1 . e + 5 1 . e + 6 1 . e + 7 f r e que n c y (h z) i no ( a / h z ? ) -800 -600 -400 -200 0 200 400 600 800 -1 0 1 2 3 4 5 t ( s ) pr i m a r y volta g e v p (v) 2 . 4 2 . 6 2 . 8 3 . 0 3 . 2 3 . 4 3 . 6 v out (v) 20 k v / s v ref v out v p -4 . 2 0 . 0 4 . 2 8 . 3 12. 5 16. 7 20. 8 25. 0 29. 2 -2 0 2 4 6 8 1 0 t ( s ) i p (a ) 2 . 4 2 . 5 2 . 6 2 . 7 2 . 8 2 . 9 3 . 0 3 . 1 3 . 2 v out (v) i p = 25 a i p v out cksr series
page 11/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com typical performance characteristics cksr 50-np figure 19: linearity error figure 20: frequency response figure 21: step response figure 22: step response figure 23: input referred noise figure 24: d v/ d t -0 . 1 -0 . 0 5 0 0 . 0 5 0 . 1 -5 0 0 5 0 i p (a ) linear i ty e rro r (% o f i p n ) -8 . 3 0 . 0 8 . 3 16. 7 25. 0 33. 3 41. 7 50. 0 58. 3 -0 . 5 0 0 . 5 1 1 . 5 2 t ( s ) i p (a ) 2 . 4 2 . 5 2 . 6 2 . 7 2 . 8 2 . 9 3 . 0 3 . 1 3 . 2 v out (v) i p = 50 a v out i p -8 . 3 0 . 0 8 . 3 16. 7 25. 0 33. 3 41. 7 50. 0 58. 3 -2 0 2 4 6 8 1 0 t ( s ) i (a ) 2 . 4 2 . 5 2 . 6 2 . 7 2 . 8 2 . 9 3 . 0 3 . 1 3 . 2 v out (v) v v out i p = 50 a i i p v out i p 0 . 1 1 1 0 100 1000 10000 1 . e + 1 1 . e + 2 1 . e + 3 1 . e + 4 1 . e + 5 1 . e + 6 1 . e + 7 f r e que n c y (h z) i no ( a / h z ? ) -800 -600 -400 -200 0 200 400 600 800 -1 0 1 2 3 4 5 t ( s ) pr i m a r y volta g e v p (v) 2 . 4 2 . 6 2 . 8 3 . 0 3 . 2 3 . 4 3 . 6 v out (v) 20 k v / s v ref v out v p -1 -0 . 8 -0 . 6 -0 . 4 -0 . 2 0 0 . 2 0 . 4 0 . 6 0 . 8 1 100 1000 10000 100000 1000000 f r e que n c y (h z) r e l a t i ve s e n s i t i v i t y ( d b ) -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 ph ase ( ) r e l a t i v e sens i t i v i t y phas e i p = 50 a cksr series
page 12/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com maximum continuous dc primary current figure 25: i p vs t a for cksr 6-np figure 26: i p vs t a for cksr 15-np figure 27: i p vs t a for cksr 25-np figure 28: i p vs t a for cksr 50-np the maximum continuous dc primary current plot shows the boundary of the area for which all the following conditions are true: - i p < i pm - junction temperature tj < 125 c - primary conductor temperature < 110 c - resistor power dissipation < 0.5 rated power frequency derating figure 29: maximum rms ac primary current / maximum dc primary current vs frequency 0 5 10 15 20 25 30 35 40 0 20 40 60 80 100 120 i p (a) t a ( c) cksr 6 -np 0 10 20 30 40 50 60 70 80 90 0 20 40 60 80 100 120 i p (a) t a ( c) cksr 15 -np 0 10 20 30 40 50 60 70 80 90 0 20 40 60 80 100 120 i p (a) t a ( c) cksr 25 -np 0 20 40 60 80 100 120 140 160 0 20 40 60 80 100 120 i p (a) t a ( c) cksr 50 -np ac d e r a ting 1 0 100 1 m 1 k 10k 100k 0 0 . 2 5 0 . 5 0 . 7 5 1 1 . 2 5 f (h z) m ax rms ac c u rre n t / m ax dc c u rre n t cksr series
page 13/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com sensitivity and linearity to measure sensitivity and linearity, the primary current (dc) is cycled from 0 to i p , then to - i p and back to 0 (equally spaced i p /10 steps).the sensitivity g is defned as the slope of the linear regression line for a cycle between i pn . the linearity error l is the maximum positive or negative difference between the measured points and the linear regression line, expressed in % of i pn . magnetic offset the magnetic offset current i om is the consequence of a current on the primary side (memory effect of the transducers ferro-magnetic parts). it is measured using the following primary current cycle. i om depends on the current value i p1 ( i p1 > i pm ). figure 30: current cycle used to measure magnetic and electrical offset (transducer supplied) ampere-turns and amperes the transducer is sensitive to the primary current linkage p (also called ampere-turns). p = n p i p (at) where n p is the number of primary turn (depending on the connection of the primary jumpers) caution: as most applications will use the transducer with only one single primary turn ( n p = 1), much of this datasheet is written in terms of primary current instead of current linkages. however, the ampere-turns (at) unit is used to emphasis that current linkages are intended and applicable. transducer simplifed model the static model of the transducer at temperature t a is: v out = g p + error in which error = v oe + v ot ( t a ) + g p g + l ( p max ) p max g + tcg ( t a -25) p g with: p = n p i p : primary current linkage (at) p max : max primary current linkage applied to the transducer v out : output voltage (v) t a : ambient operating temperature ( c) v oe : electrical offset voltage (v) v ot ( t a ) : temperature variation of v o at temperature t a ( c) g : sensitivity of the transducer (v/at) tcg : temperature coeffcient of g g : sensitivity error l ( p max ) : linearity error for p max this model is valid for primary ampere-turns p between - p max and + p max only. defnition of typical, minimum and maximum values minimum and maximum values for specified limiting and safety conditions have to be understood as such as well as values shown in typical graphs. on the other hand, measured values are part of a statistical distribution that can be specified by an interval with upper and lower limits and a probability for measured values to lie within this interval. unless otherwise stated (e.g. 100 % tested), the lem defini - tion for such intervals designated with min and max is that the probability for values of samples to lie in this interval is 99.73 %. for a normal (gaussian) distribution, this corresponds to an interval between -3 sigma and +3 sigma. if typical values are not obviously mean or average values, those values are defined to delimit intervals with a probability of 68.27 %, cor - responding to an interval between -sigma and +sigma for a normal distribution. typical, maximal and minimal values are determined during the initial characterization of a product. performance parameters defnition g t v t v i out out o m th 1 : 2 ) ( ) ( 2 1 ? = i i i i i i p ( dc) - i p 1 i p 1 0 a t 1 t t i p ( 3 ) t 2 i p ( 3 ) cksr series
page 14/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com overall accuracy the overall accuracy at 25 c x g is the error in the - i pn .. + i pn range, relative to the rated value i pn . it includes: the electrical offset v oe the sensitivity error g the linearity error l (to i pn ) the magnetic offset is part of the overall accuracy. it is taken into account in the linearity error fgure provided the transducer has not been magnetized by a current higher than i pn. response and reaction times the response time t r and the reaction time t ra are shown in fgure 32 both depend on the primary current d i/ d t . they are measured at nominal ampere-turns. figure 32: response time t r and reaction time t ra electrical offset the electrical offset voltage v oe can e ith er be measured when the ferro-magnetic parts of the transducer are: completely demagnetized, which is diffcult to realize, or in a known magnetization state, like in the current cycle shown in fgure 30. using the current cycle shown in fgure 30, the electrical offset is: the temperature variation v ot of the electrical offset voltage v ot is the variation of the electrical offset from 25 c to the considered temperature: note: the transducer has to be demagnetized prior to the ap - plication of the current cycle (for example with a demagnetiza - tion tunnel). figure 31: test connection performance parameters defnition (continued) t ra v t r 90 % 10 % t 100 % i i out p 2 ) ( ) ( 2 1 t v t v v out out oe + = ) 25 ( ) ( ) ( c v t v t v oe oe ot ? = u cksr series
page 15/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com application information filtering and decoupling supply voltage v c the fuxgate oscillator draws current pulses of up to 30 ma at a rate of ca. 900 khz. signifcant 900 khz voltage ripple on v c can indicate a power supply with high impedance. at these frequencies the power supply rejection ratio is low, and the ripple may appear on the transducer output v out and reference v ref . the transducer has internal decoupling capacitors, but in the case of a power supply with high impedance, it is advised to provide local decoupling (100 nf or more, located close to the transducer). output v out the output v out has a very low output impedance of typically 2 ohms; it can drive 100 pf directly. adding series rf = 100 ohms allows much larger capacitive loads. empirical evaluation may be necessary to obtain optimum results. the minimum load resistance on v out is 1 kohm. total primary resistance the primary resistance is 0.72 m ? per conductor. in the following table, examples of primary resistance according to the number of primary turns. reference v ref ripple present on the reference output can be fltered with a low value of capacitance because of the internal 680 ohm series resistance. the maximum flter capacitance value is 1 f. number of primary turns primary resistance r p [m ? ] recommended connections 1 0.18 9 8 7 6 out in 2 3 4 5 2 0.72 9 8 7 6 out in 2 3 4 5 4 2.88 9 8 7 6 out in 2 3 4 5 u cksr series
page 16/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com external reference voltage if the ref pin of the transducer is not used it could be either left unconnected or fltered according to the previous paragraph reference v ref . the ref pin has two modes ref in and ref out: in the ref out mode the 2.5 v internal precision reference is used by the transducer as the reference point for bipolar measurements; this internal reference is connected to the ref pin of the transducer through a 680 ohms resistor . it tolerates sink or source currents up to 5 ma, but the 680 ohms resistor prevents this current to exceed these limits. in the ref in mode, an external reference voltage is connected to the ref pin; this voltage is specifed in the range 0 to 4 v and is directly used by the transducer as the reference point for measurements. the external referenc e voltage v ref must be able: - either to source a typical current of 680 5 . 2 ? vref , the maximum value will be 2.2 ma typ. when v ref = 4 v. - or to sink a typical current of 680 5 . 2 vref ? , the maximum value will be 3.68 ma typ. when v ref = 0 v. the following graphs show how the measuring range of each transducer version depends on the external reference voltage value v ref upper limit: i p = -9.6 * v ref + 44.4 ( v ref = 0 .. 4 v) upper limit: i p = -24 * v ref + 111 ( v ref = 1.29 .. 4 v) upper limit: i p = 80 ( v ref = 0 .. 1.29 v) lower limit: i p = -9.6 * v ref + 3.6 ( v ref = 0 .. 4 v) lower limit: i p = -24 * v ref + 9 ( v ref = 0 .. 3.7 v) lower limit: i p = -80 ( v ref = 3.7 .. 4 v) -5 0 -4 0 -3 0 -2 0 -1 0 0 1 0 2 0 3 0 4 0 5 0 0 1 2 3 4 v ref (v) i p (a ) c ksr 6 -100 -8 0 -6 0 -4 0 -2 0 0 2 0 4 0 6 0 8 0 100 0 1 2 3 4 v ref (v) i p (a ) c ksr 1 5 cksr series
page 17/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com external reference voltage (continued) upper limit: i p = -40 * v ref + 185 ( v ref = 2.5 .. 4 v) upper limit: i p = -80 * v ref + 370 ( v ref = 2.75 .. 4 v) upper limit: i p = 85 ( v ref = 0 .. 2.5 v) upper limit: i p = 150 ( v ref = 0 .. 2.75 v) lower limit: i p = -40 * v ref + 15 ( v ref = 0 .. 2.5 v) lower limit: i p = -80 * v ref + 30 ( v ref = 0 .. 2.25 v) lower limit: i p = -85 ( v ref = 2.5 .. 4 v) lower limit: i p = -150 ( v ref = 2.25 .. 4 v) example with v ref = 1.65 v: the 6 a version has a measuring range from - 12.24 a to + 28.5 a the 15 a version has a measuring range from - 30.6 a to + 71.4 a the 25 a version has a measuring range from - 51 a to + 85 a the 50 a version has a measuring range from - 102 a to + 150 a example with v ref = 0 v: the 6 a version has a measuring range from + 3.6 a to + 44.4 a the 15 a version has a measuring range from + 9 a to + 80 a the 25 a version has a measuring range from + 15 a to + 85 a the 50 a version has a measuring range from + 30 a to + 150 a -200 -150 -100 -5 0 0 5 0 100 150 200 0 1 2 3 4 v ref (v) i p (a ) c ksr 5 0 -100 -8 0 -6 0 -4 0 -2 0 0 2 0 4 0 6 0 8 0 100 0 1 2 3 4 v ref (v) i p (a ) c ksr 2 5 cksr series
page 18/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com pcb footprint assembly on pcb recommended pcb hole diameter 1.3 mm for primary pin 0.8 mm for secondary pin maximum pcb thickness 2.4 mm wave soldering profle maximum 260 c for 10 s no clean process only safety this transducer must be used in limited-energy secondary circuits according to iec 61010-1. this transducer must be used in electric/electronic equipment with respect to applicable standards and safety requirements in accordance with the manufacturers operating instructions. caution, risk of electrical shock when operating the transducer, certain parts of the module can carry hazardous voltage (eg. primary busbar, power supply). ignoring this warning can lead to injury and/or cause serious damage. this transducer is a build-in device, whose conducting parts must be inaccessible after installation. a protective housing or additional shield could be used. main supply must be able to be disconnected. cksr series
page 19/19 22march 2013/version 9 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com dimensions (in mm, general linear tolerance 0.25 mm) connection u cksr series

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