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open loop
| Primary Current, Measuring Range | −20 ... 20 A |
| Output Voltage Range | −2 ... 2 V |
| Supply Voltage | 4.5 ... 5.5 V |
| Accuracy @ IPN | −1.5 ... 1.5 % of IPN |
| Operating Temperature Range | −40 ... 125 °C |
| Isolation Test Voltage | 4.95 kV |
Small drives, HVAC Inverters, Appliances, Solar Inverters.
The HMSR 8-SMS is an open loop current transducer from LEM for the electronic measurement of DC and AC currents, with galvanic isolation.
Typical applications include Small drives, HVAC Inverters, Appliances and Solar Inverters.
Key characteristics from the official datasheet: linearity error −1.5 ... 1.5 % of IPN; frequency bandwidth 300 kHz; operating temperature −40 ... 125 °C.
| General Information | |
|---|---|
| Manufacturer | LEM |
| Product Series | HMSR |
| Product Reference | HMSR 8-SMS |
| Primary Nominal Current | 8 A |
| Supply Voltage | 4.5 ... 5.5 V |
| Measurement | DC and AC currents |
| Mounting | PCB Mount |
| Application Domain | Industrial |
| Electrical Data — HMSR 8-SMS | |
|---|---|
| Primary Nominal RMS Current (IPN) | 8 A |
| Primary Current, Measuring Range (IPM) | −20 ... 20 A |
| Supply Voltage (UC) | 4.5 ... 5.5 V |
| Current Consumption (IC) | 20 ... 26 mA |
| Accuracy & Dynamic Performance | |
|---|---|
| Accuracy @ IPN | −1.5 ... 1.5 % of IPN |
| Linearity Error (εL) | −1.5 ... 1.5 % of IPN |
| Electrical Offset Voltage (VO E) @ IP = 0 | −5 ... 5 mV |
| Response Time to 90 % of IPN Step | 2 µs |
| Frequency Bandwidth | 300 kHz |
| Insulation Coordination | |
|---|---|
| RMS Voltage for AC Insulation Test (50 Hz, 1 min) Ud | 4.95 kV |
| Impulse Withstand Voltage (1.2/50 µs) UNi | 8 kV |
| Creepage Distance (dCp) | 8 mm |
| Clearance (dCI) | 8 mm |
| Comparative Tracking Index (CTI) | 600 |
| Environmental & Mechanical Characteristics | |
|---|---|
| Ambient Operating Temperature (TA) | −40 ... 125 °C |
| Ambient Storage Temperature (TA st) | −55 ... 165 °C |
| Mass (m) | 1.4 g |
| Standards & Certifications | |
|---|---|
| IEC 61800 | -5-1: |
| IEC 62109 | -1: |
| IEC 60950 | -1: |
| UL 1577 | 2014. |
Note: Specifications are taken from the official HMSR 8-SMS datasheet. Parameters that could not be confirmed from the datasheet are marked UNVERIFIED.
Official technical documentation for the HMSR 8-SMS.
Outline dimensions, pin layout and connection diagrams of the HMSR 8-SMS are shown below.
| Outline Dimensions & Mechanical Data | |
|---|---|
| Mass | 1.4 g |
Note: All dimensions are in millimetres. Refer to the official datasheet for the complete dimension drawing.
Typical applications of the HMSR 8-SMS.
The characteristic curves of the HMSR 8-SMS from the official datasheet are shown below.
| Accuracy & Dynamic Characteristics | |
|---|---|
| Accuracy @ IPN | −1.5 ... 1.5 % of IPN |
| Linearity Error (εL) | −1.5 ... 1.5 % of IPN |
| Response Time to 90 % of IPN Step | 2 µs |
| Frequency Bandwidth | 300 kHz |
Note: Refer to the datasheet for the complete set of characteristic curves.
Other models of the HMS Series share the same measurement principle, mounting concept and output interface family.
