• 0.02º phase accuracy and 0.001º resolution
• Fully isolated inputs
• 700 kHz frequency range
• Accurate with noisy, distorted and non-sinusoidal signals
• Fully autoranging and easy to use
• Voltage or current inputs
• High common-mode noise rejection
• 500 Vpk input voltage capability
• 1mV sensitivity
• 10000:1 input ratios
• IEEE-488, RS232 and printer interfaces
• Traceable to international standards

Rogowski coils

The CWT Miniature current probes utilize a Rogowski Coil sensor thin enough (typical cross section 3.5mm) to fit in very confined spaces - often between the legs of a semiconductor power switching device. With high frequency bandwidths up to 20MHz, the CWT miniature Rogowski coil is ideal for measuring switching transients or pulsed currents starting at 300mA up to 300kA in power electronic equipment. The CWT miniature Rogowski probe is a clip around flexible coil current probe based on the Rogowski principle to achieve high bandwidth measurement and faithful conversion of current to voltage, intended for use with oscilloscopes, data loggers, power meters and power analysers. Available with a 100mm or 200mm length clip-around coil, ensuring easy current monitoring even where access is limited.

A wide range of rugged clip around flexible coil current probes using Rogowski Coil technology for wide bandwidth measurement and faithful conversion of current to voltage, intended for use with oscilloscopes, data loggers, transient recorders, power meters and power analysers is available. Based on the Rogowski principle, these probes give very high bandwidth performance and measurement of very high currents (10A-300kA). The small coil profile (typically 8mm dia), means the coil can be retrospectively installed without disruption to an active power system. As standard, the coil is insulated at 10kVrms, insulation can be increased if required. Models are available with a variety of clip-around coil sizes to suit most conductors,
allowing easy current monitoring even where access is limited.

Current Sensors

The CTHR current sensors convert ac, ac+dc and dc currents to a dc level proportional to the A rms. The CTHR sensors have excellent tolerance for distorted and complex wave shapes

The CTHR sensors can provide all popular process control voltage and current loop outputs along with custom output options. A range of through hole or split core sensors means that connection is possible without shutting down manufacturing plants. Optional offset control allows nulling of residual ac currents to ensure best use of the output span (CTHR). The sensor power input is designed to operate over a wide voltage range associated with process control and sub-station auxiliary dc supply systems.

Active Hall Effect sensor technology allows measurement from DC-100kHz, depending on the core type selected. Typical applications are process control systems like PLC or SCADA, current monitoring in ac/dc drives, ultrasonics, welding and circuit breaker trip coils. For all CTHR models, a NIST/NPL (UKAS) traceable calibration certificate and certificate of conformance is supplied. All CTHR use UL or CSA approved materials.

Three-phase and single phase sensors

The RCTi & RCTrms sensors convert ac current to an isolated 0-5V voltage, 4-20mA current loop. Optional 1A or 5A outputs ensure compatibility with existing CT metering circuits. Both offer a choice of proportional (rms) and instantaneous outputs. The available RCT ranges are 0-250A to 0-50,000Apk. Both RCTi and RCTrms provide accurate measurement over a wide bandwidth ensuring precise measurement even with harmonically distorted waveshapes - using a flexible clip-on sensing coil. The RCTs are available in single and three phase.

The RCT sensor can provide all popular process control voltage and current loop outputs along with custom output options. A range of through hole or split core sensors means that connection is possible without shutting down an operating feeder. Typical applications are process control systems like PLC, SCADA Data logging systems, where power, energy and current monitoring is required. Typical loading situations are ac/dc VFD drives, ultrasonics, welding, power conversion and power distribution. For all RCT models, a NIST/NPL (UKAS) traceable calibration certificate and certificate of conformance is supplied. All RCT sensors use UL or CSA approved materials.