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page 1/11 28january2014/version 7 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 circuit and the secondary circuit. features closed loop (compensated) current transducer voltage output single supply voltage pcb mounting. advantages high accuracy very low offset drift over temperature wide aperture high overload capability high insulation capability reference pin with two modes, ref in and ref out degauss and test functions. applications residual current measurement leakage current measurement in transformerless pv inverters first human contact protection of pv arrays failure detection in power sources symmetrical fault detection (e.g. after motor inverter) leakage current detection in stacked dc sources single phase or three phase nominal current measurement up to 30 a per wire (dc or ac). standards en 50178: 1997 iec 61010-1: 2010 ul 508: 2010. application domain industrial suitable to fulfl vde 0126-1-1 and ul 1741. current transducer ctsr series i prn = 300, 600 m a ref: ctsr 0.3-p, ctsr 0.6-p n97.g9.a2.000.0, n97.g9.g6.000.0
page 2/11 28january2014/version 7 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 parameter symbol unit value supply voltage u c v 7 primary conductor temperature t b c 110 overload capability (100 s, 500 a/s) ? p a 3300 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: 3 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 parameter symbol unit value version p value version tp primary involved potential* v ac/dc 600 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 7 * enviromental: for use in pollution degree 3. conditions of acceptability when installed in the end-use equipment, consideration shall be given to the following: 1 - a suitable enclosure shall be provided in the end-use application. 2 - the insulation between the primary and the secondary sensing circuits were evaluated with 4250 v ac for ctsr 0.6-tp/ sp and 2200 v ac for ctsr 0.6-p in dielectric voltage withstand test. 5 - ctsr series is intended to be mounted on the printed wiring board of the end-use equipment. 7 - the uninsulated live parts of primary feeder and secondary circuit clearance spacing of model ctsr xx-p series shall maintain at least 5.5 mm apart. 8 - primary feeder of the devices shall be connected after an overvoltage device or system which has been evaluated by the standard for transient voltage surge suppressors, ul 1449. 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. ctsr series
page 3/11 28january2014/version 7 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 5.4 impulse withstand voltage 1.2/50 s ? w kv 10.1 partial discharge extinction rms voltage @ 10 pc u e kv 1.65 clearance (pri. - sec.) d ci mm 11 shortest distance through air creepage distance (pri. - sec.) d cp mm 11 shortest path along device body comparative tracking index cti v 600 application example - v 1000 reinforced insulation, cat iii, pd2 non uniform feld according to en 50178 application example - v 600 reinforced insulation, cat iii, pd3 non uniform feld according to en 50178, iec 61010 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 -50 105 mass m g 28 ctsr series
page 4/11 28january2014/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com electrical data ctsr 0.3-p at t a = 25 c, u c = + 5 v, output voltage referred to v ref , unless otherwise noted (see min., max., typical defnition paragraph) in page 10. parameter symbol unit min typ max comment primary nominal residual rms current i prn ma 300 primary residual current, measuring range i prm ma -500 500 supply voltage u c v 4.75 5 5.25 current consumption i c ma 17.5 21.6 + i p (ma)/ n s with n s = 1000 turns - 40 .. 105 c output voltage referred to gnd (during degauss cycle) v out v 0.3 0.5 note 1) output voltage referred to v ref (test current) v out v 0.7 1.2 1.7 note 1) reference voltage @ i p = 0 v ref v 2.495 2.5 2.505 internal reference external reference voltage v ref v 2.3 4 internal reference of v ref input = 499 ? note 1) electrical offset current referred to primary (note 2) ) i oe ma -24 7 24 temperature coeffcient of v ref @ i p = 0 tcv ref ppm/k 50 - 40 .. 105 c temperature coeffcient of v oe @ i p = 0 tcv oe ppm/k 570 ppm/k of 2.5 v - 40 .. 105 c theoretical sensitivity g th v/a 4 sensitivity error (note 2) ) g % -1.6 0.5 1.6 r l > 500 k? temperature coeffcient of g tcg ppm/k 230 - 40 .. 85 c 400 - 40 .. 105 c linearity error l % of i prm 0.5 1 magnetic offset current (1000 x i prn ) referred to primary i om ma 17 output rms noise voltage (spectral density) 1 .. 10 khz referred to primary v no mv 6 r l > 500 k? reaction time @ 10 % of i prn t ra s 7 r l > 500 k?, d i /d t > 5 a/s step response time to 90 % of i pn t r s 50 r l > 500 k?, d i /d t > 5 a/s frequency bandwidth (- 1 db) bw khz 3.5 r l > 500 k? accuracy (note 3) ) x % 1.9 = ( g 2 + l 2 ) 1/2 notes : 1) see application information section. 2) only with a primary nominal residual current, see paragraph primary nominal residual current and primary nominal current. 3) accuracy @ t a and i p : x ta = ( x 2 + ( tcg ?100?( t a - 25)) 2 + ( tcv oe ?2.5?( t a - 25 )/ g th ?100/ i p ) 2 ) 1/2 . ctsr series
page 5/11 28january2014/version 7 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 ctsr 0.3-p figure 1: frequency response figure 2: output noise voltage spectral density figure 3: output noise, cumulated rms figure 4: typical step response figure 5: typical step response relative sensitivity (db) phase () frequency (hz) e no (dbvrms/rthz) v no (v) ctsr series
page 6/11 28january2014/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com electrical data ctsr 0.6-p at t a = 25 c, u c = + 5 v, output voltage referred to v ref , unless otherwise noted (see min., max., typical defnition paragraph) in page 10. parameter symbol unit min typ max comment primary nominal residual rms current i prn ma 600 primary residual current, measuring range i prm ma -850 850 supply voltage u c v 4.75 5 5.25 current consumption i c ma 17.5 21.6 + i p (ma)/ n s with n s = 1000 turns - 40 .. 105 c output voltage referred to gnd (during degauss cycle) v out v 0.3 0.5 note 1) output voltage referred to v ref (test current) v out v 0.4 0.75 1.1 note 1) reference voltage @ i p = 0 v ref v 2.495 2.5 2.505 internal reference external reference voltage v ref v 2.3 4 internal reference of v ref input = 499 ? note 1) electrical offset current referred to primary (note 2) ) i oe ma -24 4.2 24 temperature coeffcient of v ref @ i p = 0 tcv ref ppm/k 50 - 40 .. 105 c temperature coeffcient of v oe @ i p = 0 tcv oe ppm/k 520 ppm/k of 2.5 v - 40 .. 105 c theoretical sensitivity g th v/a 2.476 sensitivity error (note 2) ) g % -0.7 0.3 0.7 r l > 500 k? temperature coeffcient of g tcg ppm/k 100 - 40 .. 105 c linearity error l % of i prm 0.4 1.3 magnetic offset current (1000 x i prn ) referred to primary i om ma 17 output rms noise voltage (spectral density) 1 .. 10 khz referred to primary v no mv 4 r l > 500 k? reaction time @ 10 % of i prn t ra s 5 r l > 500 k?, d i /d t > 5 a/s step response time to 90 % of i pn t r s 30 r l > 500 k?, d i /d t > 5 a/s frequency bandwidth (- 1 db) bw khz 9.5 r l > 500 k? accuracy (note 3) ) x % 1.5 = ( g 2 + l 2 ) 1/2 notes : 1) see application information section. 2) only with a primary nominal residual current, see paragraph primary nominal residual current and primary nominal current. 3) accuracy @ t a and i p : x ta = ( x 2 + ( tcg ?100?( t a - 25)) 2 + ( tcv oe ?2.5?( t a - 25 )/ g th ?100/ i p ) 2 ) 1/2 . ctsr series
page 7/11 28january2014/version 7 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 ctsr 0.6-p figure 6: frequency response figure 7: output noise voltage spectral density figure 8: output noise, cumulated rms figure 9: typical step response figure 10: typical step response frequency (hz) phase () relative sensitivity (db) 10 0 10 1 10 2 10 3 10 4 10 5 -110 -105 -100 -95 -90 -85 -80 -75 -70 -65 -60 f (hz) v n (dbvrms/rthz) noise voltage spectral density of v m device: ctsr 0.6-p #05-61 e no (dbvrms/rthz) 10 0 10 1 10 2 10 3 10 4 10 5 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 f c (hz) v n (v) cumulated rms noise voltage of v m device: ctsr 0.6-p #05-61 v no (v) ctsr series
page 8/11 28january2014/version 7 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, decoupling ctsr transducer supply voltage u c (5 v): the ctsr transducers have internal decoupling capacitors, but in the case of a power supply track on the application pcb having a high impedance, it is advised to provide local decoupling, 100 nf or more, located close to the transducer . reference v ref ripple present on the v ref pin can be fltered with a low value of capacitance because of the internal 499 ohm series resistance. the ctsr transducers have an internal capacitor of 22 nf between v ref pin and gnd pin and the maximum flter capacitance value which could be added is 1 f. adding a larger decoupling capacitor will increase the activation delay of degauss. output v out the ctsr transducers have an internal low pass flter 470 ohm/22 nf; if a decoupling capacitor is added on v out pin, the bandwidth and the response time will be affected. in case of short circuit, the transducer ctsr can source or sink up to a maximum of 10 ma on its output v out . using an external reference voltage if the v 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 v ref pin has two modes ref out and ref in: ? 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 v ref pin of the transducer through a 499 ohms resistor. it tolerates sink or source currents up to 5 ma, but the 499 ohms resistor prevents this current to exceed these limits. ? in the ref in mode, an external reference voltage is connected to the v ref pin; this voltage is specifed in the range 2.3 to 4 v and is directly used by the transducer as the reference point for measurements. the external reference voltage v ref must be able: o either to source a typical current of , the maximum value will be 3 ma when v ref = 4 v. o or to sink a typical current of , the maximum value will be 0.4 ma when v ref = 2.3 v. the following graphs show how the measuring range of the transducer depends on the external reference voltage value v ref ( u c = 5 v). upper limit: p = 500 ma ( v ref = 2.3 .. 2.625 v) upper limit: p = 850 ma ( v ref = 2.3 .. 2.52 v) upper limit: p = -250* v ref +1156.25 ( v ref = 2.625 .. 4 v) upper limit: p = -403.88* v ref +1867.93 ( v ref = 2.52 .. 4 v) lower limit: p = -250* v ref +93.75 ( v ref = 2.3 .. 2.375 v) lower limit: p = -403.88* v ref +151.45 ( v ref = 2.3 .. 2.48 v) lower limit: p = -500 ma ( v ref = 2.375 .. 4 v) lower limit: p = -850 ma ( v ref = 2.48 .. 4 v) 499 5 . 2 ? vref 499 5 . 2 vref ? -1 0 0 0 -8 0 0 -6 0 0 -4 0 0 -2 0 0 0 2 0 0 4 0 0 6 0 0 8 0 0 1 0 0 0 2 3 4 i p r m (m a ) v ref (v) i p r m 850 m a -6 0 0 -4 0 0 -2 0 0 0 2 0 0 4 0 0 6 0 0 2 3 4 i p r m (m a ) v ref (v) i p r m 500 m a -1 0 0 0 -8 0 0 -6 0 0 -4 0 0 -2 0 0 0 2 0 0 4 0 0 6 0 0 8 0 0 1 0 0 0 2 3 4 i p r m (m a ) v ref (v) i p r m 850 m a -6 0 0 -4 0 0 -2 0 0 0 2 0 0 4 0 0 6 0 0 2 3 4 i p r m (m a ) v ref (v) i p r m 500 m a ctsr series
page 9/11 28january2014/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com primary nominal residual current and primary nominal current the primary nominal residual current is the sum of the instantaneous values of all currents fowing through the aperture of the transducer. the primary nominal current is the current fowing through any conductor placed into the aperture of the transducer . the presence of a primary nominal current dc or ac leads to an additional uncertainty. for example, with a primary nominal current of 30 a the uncertainty referred to primary is typical 4.3 ma. ctsr transducer in test mode when the v ref pin is forced at a low level voltage between 0 and 1 v and is maintained at this level, the output voltage v out of ctsr transducer exhibits a fxed value (see specifcation) as if it measured a primary test current. the activation time of test mode is min 30 ms. the ctsr transducer can be maintained in test mode as long as needed for checking that it is fully operating. ctsr transducer in degauss mode the ctsr transducers go in degauss mode automatically at each power on or on demand by using the v ref pin. at power on: a degauss is automatically generated at each power on of the ctsr transducer; during degaussing the output voltage v out is maintained at 0.3 v typ. (max 0.5 v). after c.a. 110 ms, the output voltage v out is released and takes the normal operation level in relation with the measured primary current. using v ref pin: when the pin v ref is released from the low level voltage defned in the test mode above, there is a rising edge on v ref which generates an automatic degauss. the activation of degauss takes typically 40 s after releasing v ref pin, then degauss lasts typically 110 ms. isolation around the ctsr transducer housing due to the joint between the case and the cover of the ctsr transducer, there is some isolation distance to respect when primary conductors pass around the ctsr housing. the fgure below shows the joint and the apertures where the clearance between the secondary part inside the ctsr transducer and the surface of the housing is 3 mm (label e). v r e f v out r ef err ed t o v r e f 1 v 30 m s m easu r ed i pr m easu r ed i pr 0.7 v (0.3-p) or 0.4 v (0.6-p) 1.7 v (0.3-p) or 1.1 v (0.6-p) 1 10 m s - 2 v t est m od e deg au ss m od e - 2.5 v s u m m ar y o f t est and d eg au ss m od es at v r e f = 2.5 v 2.5 v m easu r in g m easu r in g ctsr series
page 10/11 28january2014/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com pcb footprint ctsr series assembly on pcb recommended pcb hole diameter 1.2 mm for secondary pin 2 mm for retention pin maximum pcb thickness 2.4 mm wave soldering profle maximum 260 c, 10 s no clean process only the two retention pins inserted into the case of the transducer are electrically isolated by the housing. because one of them is close to the secondary connector, it is recommended to connect both to the secondary side gnd or + u c . consequently any primary conductor must be placed in the pcb at the requested isolation distance regarding these secondary sides (see also paragraph isolation around the ctsr transducer housing). defnition of typical, minimum and maximum values minimum and maximum values for specifed 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 specifed 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 defnition 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 defned to delimit intervals with a probability of 68.27 %, corresponding 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. 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. ctsr series
page 11/11 28january2014/version 7 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 tolerance 0.3 mm) connection v ref r m u c v out out out in ctsr series

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