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ROGOWSKI CURRENT
WAVEFORM TRANSDUCERS
INSTRUCTIONS FOR USE
CWT ULTRA-MINI
& CWTUM-S
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 ULTRA-MINI
- Page 1 ROGOWSKI CURRENT WAVEFORM TRANSDUCERS INSTRUCTIONS FOR USE CWT ULTRA-MINI & CWTUM-S 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.
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Page 2: Table Of Contents
INTRODUCTION ................3 TECHNICAL SPECIFICATION ............3 STANDARDS AND APPROVALS ............. 5 OVERVIEW: CWT ULTRA-MINI & CWTUM-S........6 HANDLING INSTRUCTIONS ............7 SAFETY AND PRE-USE CHECKS ............8 POWER OPTIONS ................. 9 REPLACING THE BATTERIES ............9 SWITCHING ON ................10 OBTAINING THE BEST MEASUREMENT ........ -
Page 3: Introduction
CWT. 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) Calibration Nominally ±0.2% with the conductor central in the Rogowski loop. See the calibration certificate for further details. Positional Accuracy ±2% variation of accuracy with conductor position in the loop (see ‘Obtaining The Best Measurement’) Linearity ±0.05% of reading Noise (Typ)
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Page 5: Standards And Approvals
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 Nov 2024 © November 2024... -
Page 6: Overview: Cwt Ultra-Mini & Cwtum-S
OVERVIEW: CWT ULTRA-MINI & CWTUM-S 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... -
Page 7: Handling Instructions
HANDLING INSTRUCTIONS Every effort has been made to ensure that the CWT is as robust as possible. To achieve such an extremely thin Rogowski coil the CWT is necessarily delicate. To prolong the life of the coil please observe the following handling instructions. When fully inserted the ferrule will grip the coil. -
Page 8: Safety And Pre-Use Checks
The voltage ratings are appropriate for intermittent use of the CWT as a test instrument and not for continuous use in a permanent installation. For information regarding permanent installation of PEM’s Rogowski coils on high voltage equipment please consult PEM. -
Page 9: Power Options
CWT, remove the battery cover and replace with appropriate batteries for your CWT type. 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: Switching On
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. PEM recommend that the integrator is kept well away from any strong sources of electromagnetic interference when taking measurements. Nov 2024... -
Page 11: Obtaining The Best Measurement
50 single screened co-axial cable type. Ω 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. Nov 2024... -
Page 12: Cleaning And Decontamination
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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