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CWT Ultra Mini 요약정보 및 구매

State-of-the-art, Wide Bandwidth AC Current Probe. Ideal for Semiconductor, Power Electronic Development

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State-of-the-art, Wide Bandwidth AC Current Probe. Ideal for Semiconductor, Power Electronic Development

상품 상세설명

CWT Range of AC Current Probes
The CWT Rogowski current probe is suitable for measuring AC currents ranging from a few 100 milliamps to hundreds of kA from below 1Hz to >10MHz.

CWT Ultra Mini

Maximum coil cross section of 1.7mm fits through the legs of a TO-220 semiconductor device. Bandwidth: fH(-3db) 30MHz

  • Coil Size (Max. 1.7mm Cross Section)
  • Insulation Voltage 1.2kV peak
  • Current Ratings 30A to 6kA

Related Documents

Overview

The CWT Ultra mini range features the smallest Rogowski coil on the market. Maximum coil cross section of 1.7mm, small enough to fit through the legs of a TO-220 semiconductor device.
Wide bandwidth, 30MHz (-3dB) and excellent high frequency performance over a wide temperature range makes the CWT Ultra Mini ideal for measuring pulsed currents and sinusoidal waveforms in power electronic applications.

Standards and Approvals

  • CE marked
  • Designed to comply with IEC61010-1:2001
  • PEM Ltd is an ISO9001:2008 registered company
  • Patented technology

Performance

Peak current
30A peak to 6kA peak
Output
±6.0V peak
High Frequency Bandwidth (-3dB)
30MHz
Low Frequency Bandwidth (-3dB)
Varies with model type (refer to datasheet)
Accuracy (typ.)
Calibrated to ±0.2% with conductor central in the Rogowski loop
Typical variation with conductor position ±2.0% of reading
Operating temperature range
0℃ to +40℃ (Integrator electronics)
–40℃ to +125℃ (Coil and cable)
Coil Lengths
80mm (custom lengths available)
Coil thickness
1.7mm max.
Peak coil insulation
1.2kV peak
Cable Length (coil to integrator)
1m (custom lengths available)
Power Supply
‘B’ Battery 4 x AA (1.5V standard alkali batteries)
Plus - 1.3mm socket for 12V (±10%) DC input
‘R’ Battery 4 x AA (1.2V NiMH batteries)
Plus - 1.3mm socket for 12V (±10%) DC input
Output load
≥ 100.0 kOhm (for rated accuracy, rated sensitivity)
= 50 Ohm (for rated accuracy, but half nominal sensitivity)

Features

  • Traceable calibration (certificate included)
  • Maximum coil thickness 1.7mm
  • Non-intrusive: Loads the circuit under test by only a few pH’s
  • No magnetic materials means excellent linearity < 0.05% reading
  • Fully isolated measurement - Coil rated at 1.2kVpeak (withstand test is 3kVrms / 50Hz / 60 sec)

Applications

The CWT Ultra mini (CWTUM) has the smallest cross section, clip-around, Rogowski coil on the market. Combined with its wide-bandwidth the CWT ultra mini is a versatile tool for many applications particularly power electronics development work.

Switching Waveforms in Power Electronic Circuits

The CWT ultra mini can be used for a wide variety of electronic measurements such as switching loss in power semiconductors, current sharing in parallel devices or checking that in-circuit inductance is not over stressing an IGBT or MOSFET.
The CWTUM is non-intrusive injecting only a few pH into the primary circuit, wide-bandwidth 30MHz, has a predictable known measurement delay, and is thin and clip-around making it easy to insert into even difficult to reach parts of the circuit.
CWT Ultra mini Applications
The CWT is non-intrusive injecting only a few pH into the primary circuit, it has a high frequency bandwidth of greater than 10MHz, has a predictable known measurement delay, and is thin and clip-around making it easy to insert into even difficult to reach parts of the circuit.

50μs, 3kA peak with a 100ns falling edge CWT30 with 300mm coil and an 800MHz (3dB) co-axial shunt

Large AC Currents in Generators, Motor Drives and Power Supplies

Unlike other forms of current measurement the size of the sense coil (the Rogowski coil) is independent of the size of the measured current. Thus for large currents the size of the Rogowski coil can be chosen to suit the conductor diameter, where as probes based on magnetic materials such as hall effect become increasingly bulky and expensive at larger current ratings. Over a 1000A range there really is no better alternative to the PEM’s Rogowski current transducer.

Pulsed Power Applications

PEM’s CWT Rogowski coils have been used:

  • to monitor current in the kicker electro-magnets in a large particle accelerator.
  • in laser power supplies
  • in a ‘Superconducting Fault Current Limiter’ (Cryogenic Application)

Measuring Small AC Currents in the Presence of Large DC Currents (e.g. capacitor ripple)

Rogowski current transducers do not measure the DC component of a current. However unlike a CT or hall effect device they contain no magnetic materials so are unaffected by the DC current. Therefore it is possible to use a small, flexible, Rogowski coil to measure a small AC current in the presence of a large DC current whereas a sensor based on a magnetic principle would be expensive and bulky to prevent saturation effects. One such common application is measuring the ripple current in capacitors where the main current is DC or slow time varying.

Lightning Strike Measurement

With its wide-bandwidth, high peak current ratings and high di/dt capability (40kA/µs or larger for custom designs), the CWT is a useful tool for monitoring lightning strikes. These strikes are typically specified as 8/20µs or 10/350µs waveforms, so the current transducer needs both high frequency performance in the MHz range but also a negligible droop characteristic i.e. a low frequency bandwidth of less than 0.1Hz.
As well as our standard CWT units PEM has also supplied custom designed coils up to 20m circumference for monitoring lightning strikes in massive structures such as wind-turbines.

Measuring Small AC Currents in the Presence of Large DC Currents (e.g. capacitor ripple)

gowski current transducers do not measure the DC component of a current. However unlike a CT or hall effect device they contain no magnetic materials so are unaffected by the DC current. Therefore it is possible to use a small, flexible, Rogowski coil to measure a small AC current in the presence of a large DC current whereas a sensor based on a magnetic principle would be expensive and bulky to prevent saturation effects. One such common application is measuring the ripple current in capacitors where the main current is DC or slow time varying.

Other applications include:

  • Power converter development and diagnostics
  • High frequency Sinusoidal applications – such as Induction Heating
  • rf currents
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