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ROGOWSKI CURRENT
WAVEFORM TRANSDUCERS
INSTRUCTIONS FOR USE
CWT Mini/MiniHF
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 Mini
- Page 1 ROGOWSKI CURRENT WAVEFORM TRANSDUCERS INSTRUCTIONS FOR USE CWT Mini/MiniHF 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.
- Page 2 INTRODUCTION ................3 TECHNICAL SPECIFICATION ............3 STANDARDS AND APPROVALS ............. 5 OVERVIEW: CWT MINI/MINIHF ............ 6 HANDLING INSTRUCTIONS ............7 SAFETY AND PRE-USE CHECKS ............8 POWER OPTIONS ................. 9 REPLACING THE BATTERY ............. 9 SWITCHING ON ................10 OBTAINING THE BEST MEASUREMENT ........
- Page 3 These warnings are identified by the following symbol: The intended use is for the measurement of AC current. PEM accepts no responsibility for any damage resulting from careless use, or failure to observe these instructions.
- Page 4 Accuracy (typ.) (5% to 100% Peak Current) Nominally ±0.2% with the conductor central in the Rogowski loop. Calibration See the calibration certificate for further details. ±2% variation of accuracy with conductor position in the loop Positional Accuracy (see ‘Obtaining The Best Measurement’) Linearity ±0.05% of reading Noise (Max)
- Page 5 STANDARDS AND APPROVALS EMC Approvals EN61326-1:2021 FCC Title 47 (CFR:2010, Part 15b) Safety Approvals EN61010-1:2010+A1:2019 EN61010-2-032:2012 Quality System IS09001:2015 © November 2024 Nov 2024...
- Page 6 OVERVIEW: CWT MINI/MINIHF 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 To achieve such an extremely thin Rogowski coil the CWT Mini/MiniHF is necessarily delicate. Every effort has been made to ensure that the CWT Mini/MiniHF is as robust as possible. To prolong the life of the coil please observe the following handling instructions.
- Page 8 The voltage rating (safe PEAK working voltage) is clearly labelled on the coil. For the CWT Mini this is either 2kV peak or 5kV peak. Never use at voltages greater than this value. Voltage ratings are only valid if the ‘free-end’ of the coil is fully inserted into the socket, and remains fully inserted during use.
- Page 9 Alkaline batteries that are deeply discharged are more prone to leaking. PEM strongly advise that for long-term storage, the batteries are removed from the instrument.
- Page 10 After switch on the CWT may require a settling period of up to 2 minutes before providing an accurate measurement. The settling period is dependent on warm-up time and the low frequency bandwidth. PEM recommend that the integrator is kept well away from any strong sources of electromagnetic interference when taking measurements. © November 2024...
- Page 11 50ohm single screened co-axial cable type. PEM does not consider the use of extension cables to be problematic from the noise viewpoint, but consideration should be given to the routing of very long cables.
- Page 12 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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