IT 200-S ULTRASTAB, IT200-S ULTRASTAB

IT200S ULTRASTAB | LEM Ultra-High Precision Closed-Loop Fluxgate Current Transducer

±200 A | DC ~ 500 kHz | Accuracy 0.0084% | Closed-Loop Fluxgate Technology

IT200-S Product Overview

The IT200-S ULTRASTAB is an ultra-high precision closed-loop fluxgate current transducer from LEM (Switzerland), part of the IT series. It is designed for high-accuracy measurement of DC, AC and pulsed currents. With outstanding performance and long-term stability, this transducer has become a trusted choice for engineers in industrial testing, medical equipment, precision power supplies, metrology and calibration.

Rated current: 200 A DC | Secondary output: 200 mA | Accuracy: 0.0084% | Bandwidth: DC ~ 500 kHz

IT200-S Core Technology: Closed-Loop Fluxgate

Unlike conventional Hall-effect transducers, the IT200-S uses LEM's advanced closed-loop fluxgate IT technology, achieving ultra-high accuracy through a zeroflux detection principle. The transducer does not use a Hall device. A zero-flux detector combined with a dual-magnetic-core structure continuously compensates the flux generated by the primary current, so that the secondary compensation current accurately reflects the primary current value. This technology fundamentally eliminates hysteresis error and zero drift, delivering a level of measurement accuracy that traditional Hall sensors cannot match.

IT200-S Key Advantages

Ultra-High Accuracy, Unrivalled Linearity

The IT200-S achieves an overall accuracy of 0.0084% and a linearity error of ≤3 ppm. That means at a full-scale 200 A measurement, the maximum error is less than 17 mA – performance comparable to top-grade metrology instruments. For applications demanding stringent accuracy, such as power analysis, energy efficiency evaluation and PV inverter testing, the IT200-S provides reliable data.

Very Low Temperature Drift, Stable Across the Whole Temperature Range

Temperature is one of the main factors affecting measurement accuracy. The IT200-S has an offset drift coefficient of only 2 ppm/K, maintaining excellent stability over the entire operating temperature range (+10 °C to +50 °C). Whether the ambient temperature changes, every milliampere of output remains precise and dependable.

Wide Bandwidth, DC to 500 kHz Full Coverage

The bandwidth of the IT200-S is DC ~ 500 kHz (–3 dB). Whether it is a steady-state DC current, power-frequency AC current, complex waveforms with rich harmonics, or pulsed impulse currents, the transducer faithfully reproduces the signal without losing critical information.

Excellent Immunity to Interference

Builtin electrostatic shielding between primary and secondary gives the transducer strong immunity to external electric and magnetic fields. In harsh EMI environments such as variable frequency drives and high-power equipment, the IT200-S still provides clean and stable output.

No Insertion Loss, Does Not Disturb the Measured Circuit

The closed-loop fluxgate design introduces no additional insertion loss or reflected noise into the primary circuit. This is particularly important for precision circuit and sensitive system measurements.

High Resolution and Low Noise Output

The output signal of the IT200-S has extremely low noise, and the transducer does not reflect noise back into the primary conductor. Combined with its high resolution, it captures small current variations and excels in weak-signal detection applications.

IT200-S Typical Applications

MRI magnetic resonance imaging equipment – used as the feedback element in high-performance gradient amplifiers, providing ultra-high precision current feedback control for medical imaging systems, directly affecting image quality and diagnostic accuracy

High-precision programmable power supplies – serving as the feedback element in precision current regulation equipment, enabling nA-level fine output control

Power analysers and energy metering – used together with high-precision power analysers for PV inverter LVRT functional tests, efficiency evaluation, and IEC harmonic/flicker measurements

Calibration and metrology – used as a standard-grade current transducer in laboratory calibration setups, providing an accurate reference for lower-level measurement equipment

Industrial testing and medical equipment – widely used in precision motor controllers, proton therapy equipment and other highend applications

IT200-S Technical Specifications

Why Choose the IT200-S?

In test applications that demand extreme precision and long-term stability, every ppm of error can affect the final conclusion. The LEM IT200-S ULTRASTAB, with its closed-loop fluxgate technology, 3 ppm linearity and 2 ppm/K temperature drift coefficient, stands out among similar products. It has become a preferred choice in MRI systems, high-precision power supplies and calibration setups.

LEM is a globally recognised leader in electrical measurement transducers, with over 40 years of experience and a customer base worldwide. Choosing the IT200S gives you not only a high-performance transducer but also LEM's commitment to quality and professional technical support.