Current Transducer HO-NSM-0000 SERIES IPN = 8, 15, 25 A Ref: HO 8-NSM-0000, HO 15-NSM-0000, HO 25-NSM-0000 For the electronic measurement of current: DC, AC, pulsed..., with galvanic separation between the primary and the secondary circuit. Features Applications ●● Hall effect measuring principle ●● AC variable speed drives ●● Multirange current transducer through PCB ●● Static converters for DC motor drives ●● Battery supplied applications pattern lay-out ●● Galvanic separation between primary and secondary circuit ●● Uninterruptible Power Supplies (UPS) ●● Insulated test voltage 4300 V ●● Switched Mode Power Supplies (SMPS) ●● Low power consumption ●● Power supplies for welding applications ●● Extremely low profile 12 mm ●● The solar inverter on DC side of the inverter (MPPT) ●● Single power supply + 5 V ●● Combiner box. ●● Fixed offset & sensitivity ●● Over-current detect 2.63 x IPN (peak value) ●● Memory check. Standards ●● EN 50178: 1997 ●● Small size and space saving ●● IEC 61010-1: 2010 ●● IEC 61326-1: 2012 ●● UL 508: 2010. ●● Only one design for wide primary current range Application Domain Advantages ●● High immunity to external interference ●● 8 mm creepage /clearance ●● Industrial. ●● High insulation capability ●● Fast response. N°64.52.11.000.0, N°64.52.15.000.0, N°64.52.19.000.0 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice Page 1/16 www.lem.com HO-NSM-0000 SERIES Absolute maximum ratings Symbol Unit Value Supply voltage (not operating) Parameter UC V 6.5 Primary conductor temperature TB °C 120 UESD kV 2 ESD rating, Human Body Model (HBM) 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 certification File # E189713 Volume: 2 Section: 5 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 Primary involved potential Unit Value V AC/DC 600 Max surrounding air temperature TA °C 105 Primary current IP A According to series primary currents Secondary supply voltage UC V DC 5 Output voltage Vout V 0 to 5 Conditions of acceptability When installed in the end-use equipment, consideration shall be given to the following: 1 - These devices have been evaluated for overvoltage category III and for use in pollution degree 2 environment. 2 - A suitable enclosure shall be provided in the end-use application. 3 - The terminals have not been evaluated for field wiring. 4 - These devices have been evaluated for use in 105°C maximum surrounding air temperature. 5 - The secondary (Sensing) circuit is intended to be supplied by a Isolated Secondary Circuit - Limited voltage circuit defined by UL 508 paragraph 32.5. The maximum open circuit voltage potential available to the circuit and overcurrent protection shall be evaluated in the end use application. 6 - These devices are intended to be mounted on a printed wiring board of end-use equipment. The suitability of the connections (including spacings) shall be determined in the end-use application. 7 - Primary terminals shall not be straightened since assembly of housing case depends upon bending of the terminals. 8 - Any surface of polymeric housing have not been evaluated as insulating barrier. 9 - Low voltage circuits are intended to be powered by a circuit derived from an isolating source (such as a 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). 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. Page 2/16 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com HO-NSM-0000 SERIES Insulation coordination Parameter Symbol Unit Value Rms voltage for AC isolation test 50/60Hz/1 min Ud kV 4.3 Impulse withstand voltage 1.2/50 µs ÛW kV 8 Comment Partial discharge extinction rms voltage @ 10 pC Ue V 1650 Clearance (pri. - sec.) dCI mm 8 Shortest distance through air Creepage distance (pri. - sec.) dCp mm 8 Shortest path along device body V0 according to UL 94 Case material Comparative tracking index CTI V 600 Application example - - 600 V CAT III PD2 Reinforced insulation, non uniform field according to EN 50178 Application example - - 300 V CAT III PD2 Reinforced insulation, non uniform field according to IEC 61010 Application example - - 1000 V CAT III PD2 Simple insulation, non uniform field according to EN 50178, IEC 61010 Symbol Unit Min Ambient operating temperature TA °C -40 105 Ambient storage temperature TS °C -40 105 Environmental and mechanical characteristics Parameter Surrounding temperature according to UL 508 Mass Typ °C m g Max Comment 105 5 Page 3/16 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com HO-NSM-0000 SERIES Electrical data IPN = 8 A At TA = 25°C, UC = + 5 V, NP = 1 turn, RL = 10 KΩ unless otherwise noted (see Min, Max, typ. definition paragraph in page 12). Parameter Symbol Unit Min Typ Max Primary nominal rms current IPN A Primary current, measuring range IPM A Number of primary turns NP Supply voltage UC V Current consumption IC mA Reference voltage Vref V 2.475 External reference voltage Vref V 0.5 2.65 Output voltage range @ IPM Vout - Vref V -2 2 Output voltage @ IP = 0 A Vout V Electrical offset voltage VOE mV Temperature coefficient of Vref Temperature coefficient of VOE TCVref 8 -20 20 1,2,3 4.5 5 5.5 19 25 2.5 2.525 mV/K Theoretical sensitivity Gth mV/A Sensitivity error εG % of IPN TCG ppm/K Internal reference Vref + VOE -7 7 ±160 -20 °C .. 85 °C Internal reference ±190 -40 °C .. 105 °C Internal reference ppm/K TCVOE Temperature coefficient of G Comment ±0.088 -20 °C .. 85 °C ±0.095 -40 °C .. 105 °C 800 mV/ IPN @ UC = 5 V 100 ±0.5 Factory adjustment ±200 -40 °C .. 85 °C ±220 -40 °C .. 105 °C Linearity error 0 .. IPN εL % of IPN ±0.5 @ UC = 5 V Linearity error 0 .. IPM εL % of IPM ±0.8 @ UC = 5 V %/% ±0.05 Gain error per UC drift VOM mV ±4 Reaction time @ 10 % of IPN tra µs 2 di/dt = IPN/µs Response time @ 90 % of IPN tr µs 3.5 di/dt = IPN/µs Frequency bandwidth (- 3 dB) BW kHz Output rms voltage noise (spectral density) (DC .. 100 kHz) eno µV/√Hz 32.9 @ UC = 5 V Output voltage noise (DC .. 20 MHz) Vno mVpp Gain error with respect to UC ± 10 % Magnetic offset voltage @ IP = 0 after 2.5 x IPN Standby pin “0” level 250 80 V Standby pin “1” level V Time to switch from standby to normal mode µs Over-current detect V 0.3 UC -0.3 20 2.6 x IPN 2.9 x IPN 3.2 x IPN peak value Accuracy @ IPN X % of IPN ±1 Accuracy @ IPN @ TA = + 85°C X % of IPN ±2.9 See formula note 1) Accuracy @ IPN @ TA = + 105°C X % of IPN ±3.8 See formula note 1) Note: 1) = εG + εL Accuracy @ IP and XTA = ± [X + (TCG/10000) · (TA - 25) + TCVOE · 100 · (TA -25) / (Gth · IP)]. Page 4/16 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com HO-NSM-0000 SERIES Electrical data IPN = 15 A At TA = 25°C, UC = + 5 V, NP = 1 turn, RL = 10 KΩ unless otherwise noted (see Min, Max, typ. definition paragraph in page 12). Parameter Symbol Unit Min Primary nominal rms current IPN A Primary current, measuring range IPM A Number of primary turns NP Supply voltage UC V Current consumption IC mA Reference voltage Vref V 2.475 External reference voltage Vref V 0.5 2.65 Output voltage range @ IPM Vout - Vref V -2 2 Output voltage @ IP = 0 A Vout V Electrical offset voltage VOE mV Typ Max 15 -37.5 37.5 1,2,3 4.5 5 5.5 19 25 2.5 2.525 Internal reference Vref + VOE -5 5 ±160 -20 °C .. 85 °C Internal reference ±190 -40 °C .. 105 °C Internal reference Temperature coefficient of Vref TCVref ppm/K Temperature coefficient of VOE TCVOE mV/K Theoretical sensitivity Gth mV/A Sensitivity error εG % of IPN ±0.5 TCG ppm/K ±200 Temperature coefficient of G Comment ±0.075 800 mV/ IPN, @ UC = 5 V 53.33 Factory adjustment Linearity error 0 .. IPN εL % of IPN ±0.5 @ UC = 5 V Linearity error 0 .. IPM εL % of IPM ±0.8 @ UC = 5 V %/% ±0.05 Gain error per UC drift VOM mV ±5 Reaction time @ 10 % of IPN tra µs 2 di/dt = IPN/µs Response time @ 90 % of IPN tr µs 3.5 di/dt = IPN/µs Frequency bandwidth (- 3 dB) BW kHz Output rms voltage noise (spectral density) (DC .. 100 MHz) eno µV/√Hz Output voltage noise (DC .. 20 MHz) Vno mVpp Gain error with respect to UC ± 10 % Magnetic offset voltage @ IP = 0 after 2.5 x IPN Standby pin “0” level V Standby pin “1” level V Time to switch from standby to normal mode µs Over-current detect V 250 17.5 50 0.3 UC -0.3 20 2.6 x IPN 2.9 x IPN 3.2 x IPN peak value Accuracy @ IPN X % of IPN ±1 Accuracy @ IPN @ TA = + 85 °C X % of IPN ±2.8 See formula note 1) Accuracy @ IPN @ TA = + 105 °C X % of IPN ±3.4 See formula note 1) Note: 1) = εG + εL Accuracy @ IP and XTA = ± [X + (TCG/10000) · (TA - 25) + TCVOE · 100 · (TA -25) / (Gth · IP)]. Page 5/16 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com HO-NSM-0000 SERIES Electrical data IPN = 25 A At TA = 25°C, UC = + 5 V, NP = 1 turn, RL = 10 KΩ unless otherwise noted (see Min, Max, typ. definition paragraph in page 12). Parameter Symbol Unit Min Primary nominal rms current IPN A Primary current, measuring range IPM A Number of primary turns NP Supply voltage UC V Current consumption IC mA Reference voltage Vref V 2.475 External reference voltage Vref V 0.5 2.65 Output voltage range @ IPM Vout - Vref V -2 2 Output voltage @ IP = 0 A Vout V Electrical offset voltage VOE mV Typ Max 25 -62.5 62.5 1,2,3 4.5 5 5.5 19 25 2.5 2.525 -5 5 ±160 -20 °C .. 85 °C Internal reference ±190 -40 °C .. 105 °C Internal reference TCVref ppm/K Temperature coefficient of VOE TCVOE mV/K Gth mV/A εG % of IPN ±0.5 TCG ppm/K ±200 Sensitivity error Temperature coefficient of G Internal reference Vref + VOE Temperature coefficient of Vref Theoretical sensitivity Comment ±0.075 800 mV/ IPN @ UC = 5 V 32 Factory adjustment Linearity error 0 .. IPN εL % of IPN ±0.5 @ UC = 5 V Linearity error 0 .. IPM εL % of IPM ±0.8 @ UC = 5 V %/% ±0.05 Gain error per UC drift VOM mV ±6 Gain error with respect to UC ± 10 % Magnetic offset voltage @ IP = 0 after 2.5 x IPN Reaction time @ 10 % of IPN tra µs 2 di/dt = IPN/µs Response time @ 90 % of IPN tr µs 3.5 di/dt = IPN/µs Frequency bandwidth (- 3 dB) BW kHz Output rms voltage noise (spectral density) (DC .. 100 MHz) eno µV/√Hz Output voltage noise (DC .. 20 MHz) Vno mVpp Standby pin “0” level V Standby pin “1” level V Time to switch from standby to normal mode µs Over-current detect V 250 10.5 30 0.3 UC -0.3 20 2.6 x IPN 2.9 x IPN 3.2 x IPN peak value Accuracy @ IPN X % of IPN ±1 Accuracy @ IPN @ TA = + 85 °C X % of IPN ±2.8 See formula note 1) Accuracy @ IPN @ TA = + 105 °C X % of IPN ±3.4 See formula note 1) Note: 1) = εG + εL Accuracy @ IP and X TA = ± [X + (TCG/10000) · (TA - 25) + TCVOE · 100 · (TA -25) / (Gth · IP)]. Page 6/16 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com HO-NSM-0000 SERIES Typical performance characteristics IPN = 8 A Linearity error HO 8-NP Frequency characteristics Gain [0 dB at 50 Hz] Spec Phase 0.3 6.0 180 0.2 4.0 120 2.0 60 0.0 0 Gain [0 dB at 50 Hz] Linearity error (%) 0.4 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 -10 -8 -6 -4 -2 0 2 4 6 8 10 -2.0 -60 -4.0 -120 -6.0 Primary current (A) 10 100 1000 10000 100000 Phase [deg] 0.5 -180 1000000 Frequency [Hz] Figure 1: Linearity error Figure 2: Frequency response Vout Ip Vout Ip 2 µs/div Figure 3: Step response 1 µs/div Figure 4: dv/dt 20 mV/div Figure 5: Output noise Page 7/16 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com HO-NSM-0000 SERIES Typical performance characteristics IPN = 15 A Linearity error HO 15-NP Frequency characteristics Gain [0 dB at 50 Hz] 0.4 0.2 Gain [0 dB at 50 Hz] Linearity error (%) 0.3 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 -20 -15 -10 -5 0 5 10 15 20 Spec Phase 6.0 180 4.0 120 2.0 60 0.0 0 -2.0 -60 -4.0 -120 -6.0 10 100 Primary current (A) 1000 10000 100000 Phase [deg] 0.5 -180 1000000 Frequency [Hz] Figure 6: Linearity error Figure 7: Frequency response Vout Ip Vout Ip 1 µs/div 2 µs/div Figure 8: Step response Figure 9: dv/dt 20 mV/div Figure 10: Output noise Page 8/16 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com HO-NSM-0000 SERIES Typical performance characteristics IPN = 25 A Linearity error HO 25-NP Frequency characteristics 0.5 Phase 6.0 180 0.2 4.0 120 2.0 60 0.0 0 Gain [0 dB at 50 Hz] Linearity error (%) Spec 0.3 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 -30 -20 -10 0 10 20 30 Primary current (A) -2.0 -60 -4.0 -120 -6.0 10 100 1000 10000 100000 Phase [deg] Gain [0 dB at 50 Hz] 0.4 -180 1000000 Frequency [Hz] Figure 11: Linearity error Figure 12: Frequency response Vout Ip Vout Ip 2 µs/div Figure 13: Step response 1 µs/div Figure 14: dv/dt 20 mV/div Figure 15: Output noise Page 9/16 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com HO-NSM-0000 SERIES Maximum continuous DC primary primary current 50 100 40 75 IP (A) IP (A) 30 20 50 25 10 15A 15A 15A 8A 0 0 0 25 50 75 TA( ℃) 100 0 125 25 50 75 TA( ℃) 100 125 125 100 IP (A) 75 50 25 25A 0 0 25 50 75 TA( ℃) 100 125 Figure 16: IP vs TA for HO series Important notice: w hatever the usage and/or application, the transducer jumper temperature shall not go above the maximum rating of 120 °C as stated in page 2 of this datasheet. Page 10/16 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com HO-NSM-0000 SERIES Measuring range with external reference voltage 50 40 IP (A) 30 20 Upper limit: IP = - 10 × Vref + 45 (Vref = 0.5 .. 2.65 V) Lower limit: IP = - 10 × Vref + 5 (Vref = 0.5 .. 2.65 V) Upper limit: IP = - 18.75 × Vref + 84.38 (Vref = 0.5 .. 2.65 V) Lower limit: IP = - 18.75 × Vref + 9.38 (Vref = 0.5 .. 2.65 V) Upper limit: TA = 105° C IP = 80 (Vref = 0.5 ..1.94 V) IP =31.25 × Vref + 140.63 (Vref = 1.94 .. 2.65 V) TA = 85° C IP = 90 (Vref = 0.5 ..1.62 V) IP =31.25 × Vref + 140.63 (Vref = 1.62 .. 2.65 V) TA = 60° C IP = 100 (Vref = 0.5 ..1.3 V) IP =31.25 × Vref + 140.63 (Vref = 1.3 .. 2.65 V) TA = 25° C IP = 110 (Vref = 0.5 ..0.98 V) IP =31.25 × Vref + 140.63 (Vref = 0.98 .. 2.65 V) Lower limit: IP = - 31.25 × Vref + 15.63 (Vref = 0.5 .. 2.5 V) 10 0 -10 -20 HO 8 -30 0.5 1 1.5 2 Vref (V) 2.5 100 80 IP (A) 60 40 20 0 -20 -40 HO 15 -60 0.5 1 1.5 2 Vref (V) 2.5 120 90 IP (A) 60 25℃ 60℃ 85℃ 105℃ 30 0 -30 -60 -90 HO 25 0.5 1 1.5 2 Vref (V) 2.5 Example with Vref = 0.5 V: ●● The 8 A version has a measuring range from 0 A to 40 A ●● The 15 A version has a measuring range from 0 A to 75 A ●● The 25 A version has a measuring range from 0 A to 80 A at TA = 105° C Example with Vref = 1.5 V: ●● The 8 A version has a measuring range from - 10 A to 30 A ●● The 15 A version has a measuring range from - 18.7 A to + 56.3 A ●● The 25 A version has a measuring range from - 31.2 A to + 90 A at TA = 85° C 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice Page 11/16 www.lem.com HO-NSM-0000 SERIES Application information Total primary resistance The primary resistance is 0.36 mΩ per conductor at 25 °C. In the following table, examples of primary resistance according to the number of primary turns. Number of primary turns Primary resistance current rms RP [ mΩ ] 1 0.12 Recommended connections IN 2 12 11 8 13 9 12 10 11 8 13 9 12 10 11 8 9 10 OUT 1.18 IN 8 15 25 4 7.5 12.5 2.67 5 8.33 OUT 0.54 IN 3 13 Primary nominal current IPN[ A ] OUT Definition 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 definition 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 %, 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. Remark Installation of the transducer must be done unless otherwise specified on the datasheet, according to LEM Transducer Generic Mounting Rules. Please refer to LEM document N°ANE120504 available on our Web site: Products/Product Documentation. Page 12/16 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com HO-NSM-0000 SERIES HO name and codification HO-NSM name and codification as example HO 15-NSM/SPXXX-1)2)3)4) HO 15-NSM-1)2)3)4) The 1)2)3)4) indicate the transducer programming. 1) Reference out: 2.5 V Code: 0 1.65 V Code: 1 1.5 V Code: 2 0.5 V Code: 3 Only Vref IN Code: 4 (Low power mode engaged) 2) Response time: 3.5 s Code: 0 2 s Code: 1 6 s Code: 2 3) Control EEPROM: YES Code: 0 NO Code: 1 4) Overcurrent detection: 2.9 Code: 0 3.6 Code: 1 4.0 Code: 2 4.8 Code: 3 5.2 Code: 4 5.8 Code: 5 1.7 Code: 6 2.3 Code: 7 0.67 Code: A 0.94 Code: B 1.17 Code: C 1.4 Code: D 1.6 Code: E 1.9 Code: F 2.1 Code: G 2.3 Code: H SET_THRESH = 0 SET_THRESH = 1 HO 15-NSM/SP33-1)2)3)4) + 3.3 V power supply HO 15-NSM-1)2)3)4) + 5 V power supply Page 13/16 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com HO-NSM-0000 SERIES PCB Footprint Reflow profile 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 manufacturer’s operating instructions. Caution, risk of electrical shock. When operating the transducer, certain parts of the module can carry hazardous voltage (e.g. primary bus bar, 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. Page 14/16 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com HO-NSM-0000 SERIES Performance parameters definition Ampere-turns and amperes The transducer is sensitive to the primary current linkage ΘP (also called ampere-turns). ΘP = NP·IP (At) Where NP 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 (NP = 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. IP (DC) IP1 0A -IP1 t1 t Ip(3) t2 Ip(t 3) Figure 17: C urrent cycle used to measure magnetic and electrical offset (transducer supplied) Transducer simplified model Electrical offset The static model of the transducer at temperature TA is: Vout = G·ΘP + overall error (mV) In which error = εG ·ΘP·G + εL·ΘP·G + TCG (TA-25)·ΘP·G + VOE + TCVOE·(TA-25) (mV) The electrical offset voltage VOE can either be measured when the ferro-magnetic parts of the transducer are: With: ●● or in a known magnetization state, like in the current ΘP = NP·IP : primary current linkage (At) ΘP max :m ax primary current linkage applied to the transducer (At) : output voltage (V) : ambient operating temperature (°C) : electrical offset current (V) : temperature coefficient of VOE (mV/K) : sensitivity of the transducer (V/At) : temperature coefficient of G (%/K) : sensitivity error (%) : linearity error for ΘP max (%) Vout TA VOE TCVOE G TCG εG εL(ΘP max) This model is valid for primary ampere-turns ΘP between -ΘP max and +ΘP max only. Sensitivity and linearity To measure sensitivity and linearity, the primary current (DC) is cycled from 0 to IP, then to -IP and back to 0 (equally spaced IP/10 steps). The sensitivity G is defined as the slope of the linear regression line for a cycle between ± IPN. The linearity error εL is the maximum positive or negative difference between the measured points and the linear regression line, expressed in % of IPN. Magnetic offset The magnetic offset voltage VOM is the consequence of a current on the primary side (“memory effect” of the transducer’s ferromagnetic parts). It is measured using the following primary current cycle. VOM depends on the current value IP1 (IP1> IPM). V = OM V (t ) − V (t ) 2 out 1 out 2 ●● completely demagnetized, which is difficult to realize, cycle shown in figure 17. Using the current cycle shown in figure 18, the electrical V = OE V (t ) + V (t ) 2 1 out out 2 offset is: ... (T ) = ... (T ) − ... (25 °C) Note: the transducer has to be demagnetized prior to the application of the current cycle (for example with a demagnetization tunnel). OE OT OE Overall accuracy The overall accuracy at 25 °C XG is the error in the - IPN .. + IPN range, relative to the rated value IPN. It includes: ●● the electrical offset VOE/ ΘP·G (%) ●● the sensitivity error εG (%) ●● the linearity error εL (to IPN) (%) Response and reaction times The response time tr and the reaction time tra are shown in figure 18. Both depend on the primary current di/dt. They are measured at nominal ampere-turns. I 100 % 90 % Vout Ip tr 10 % tra t Figure 18: Response time tr and reaction time tra 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice Page 15/16 www.lem.com HO-NSM-0000 SERIES Dimensions HO 8-NSM-0000, HO 15-NSM-0000, HO 25-NSM-0000 (mm, general linear tolerance ± 0.5 mm) Required Connection OUT 11 12 13 1 2 47nF 5Ω 3 4.7nF 200Ω 4 47nF 5 >10kΩ 6 Vout Vref (IN/OUT) OCD STANDBY 7 10 9 8 + Uc 0V N/A (connected to ground) IN Page 16/16 18February2014/Version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com