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ROGOWSKI CURRENT
WAVEFORM TRANSDUCERS
INSTRUCTIONS FOR USE
CWT
CWTLF
CWTHF
POWER ELECTRONIC MEASUREMENTS Ltd.
+44 (0)115 946 9657 • info@pemuk.com • www.pemuk.com
This document is copyright © November 2024 Power Electronic Measurements Ltd. and all rights are reserved.
No part may be copied or reproduced in any form without prior written consent.
Nov 2024
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Summary of Contents for PEM CWT
- Page 1 ROGOWSKI CURRENT WAVEFORM TRANSDUCERS INSTRUCTIONS FOR USE CWTLF CWTHF POWER ELECTRONIC MEASUREMENTS Ltd. +44 (0)115 946 9657 • info@pemuk.com • www.pemuk.com This document is copyright © November 2024 Power Electronic Measurements Ltd. and all rights are reserved. No part may be copied or reproduced in any form without prior written consent. Nov 2024...
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Page 2: Table Of Contents
REPLACING THE BATTERIES ............9 SWITCHING ON ................10 OBTAINING THE BEST MEASUREMENT ........11 CLEANING AND DECONTAMINATION ......... 12 WARRANTY ................12 RETURNING YOUR CWT FOR RECALIBRATION OR REPAIR ..12 END OF LIFE DISPOSAL ............... 12 Nov 2024 © November 2024... -
Page 3: Introduction
The CWT/CWTLF/CWTHF (CWT) Rogowski Current Waveform Transducer from PEM combines high bandwidth performance with minimal disruption to the circuit under test. These instructions must be followed whenever the CWT is used. They are intended to help you obtain the best and safest performance from the transducer. - Page 4 Coil Insulation 10kV peak Coil Bend Radius 40mm Absolute Max di/dt Ratings CWT (All Models) 40kA/µs (peak), 1.5kA/µs (rms) CWTHF/015 to /1 70kA/µs (peak), 1.5kA/µs (rms) CWTHF/3 to /1500 120kA/µs (peak), 1.5kA/µs (rms) CWTLF/1 to /60 11kA/µs (peak), 0.8kA/µs (rms) CWTLF/150 to /1500 20kA/µs (peak), 0.8kA/µs (rms)
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Page 5: Standards And Approvals
STANDARDS AND APPROVALS EMC Approvals EN61326-1:2013 FCC Title 47 (CFR:2010, Part 15b) Safety Approvals EN61010-1:2010+A1:2019 EN61010-2-032:2012 Quality System IS09001:2015 Nov 2024 © November 2024... -
Page 6: Overview: Cwt/Cwtlf/Cwthf
OVERVIEW: CWT/CWTLF/CWTHF 1. Rogowski Coil (Probe) 2. Probe ‘Free End’ 3. Ferrule 4. Connecting Cable 5. DC Power Socket 6. DC Power Status LED 7. Enclosure 8. BNC Output Socket 9. 4 x AA batteries 10.Status Indicator LED GREEN = ON = Battery LOW 11.Power Button... -
Page 7: Handling Instructions
HANDLING INSTRUCTIONS The coil is fully inserted when the user feels the free-end of the coil engage with the internal click-in mechanism inside the ferrule. Visual indication that the coil mechanism is fully inserted is provided by the black coil marker situated near the end of the coil, as shown below. -
Page 8: Safety And Pre-Use Checks
THE CWT ROGOWSKI COIL The insulation around the Rogowski coil must be VISUALLY INSPECTED before use, and the CWT must NOT BE USED if there are signs of damage. When bending the flexible coil around a conductor, avoid tight bends and sharp edges that could damage the coil. -
Page 9: Power Options
POWER OPTIONS The CWT can be powered by an external DC source or by one of two battery options. The battery option is displayed along with the model type on the CWT serial number label and will state either standard non-rechargeable batteries [B] or rechargeable option [R] External Supply The CWT can be powered by an external DC supply. -
Page 10: Switching On
LED indicates that the transducer is ON when the LED is GREEN. After switch-on the CWT may require a settling period of up to 2 minutes before providing correct current measurement. The settling period is dependent on warm-up time and the low frequency bandwidth. -
Page 11: Obtaining The Best Measurement
SENSITIVITY TO EXTERNAL CURRENTS AND VOLTAGES The sensitivity of the CWT to currents that are outside the closed loop of the Rogowski coil is very small, provided that the external currents are less than the current rating of the CWT or that such currents are relatively distant from the coil. -
Page 12: Cleaning And Decontamination
24 months from the date of despatch from Power Electronic Measurements Ltd. In the event of a defect where the transducer has not been misused the CWT should be returned to PEM with all freight charges to be paid by the customer. Correction shall be in the form of repair or replacement.
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