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ROGOWSKI CURRENT
WAVEFORM TRANSDUCERS
INSTRUCTIONS FOR USE
CWT Mini50HF
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 Mini50HF
- Page 1 ROGOWSKI CURRENT WAVEFORM TRANSDUCERS INSTRUCTIONS FOR USE CWT Mini50HF 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 MINI50HF ............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: Introduction
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 130mA @12VDC – ‘R’ version NiMH Rechargeable Battery DC Socket Type 1.3mm x 3.5mm Jack Socket – Centre Positive Tip The device should only be powered by the PEM approved mains adaptor. Adaptor Supply Voltage 100 – 240VAC Adaptor Supply Frequency...
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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 © November 2024 Nov 2024... -
Page 6: Overview: Cwt Mini50Hf
OVERVIEW: CWT MINI50HF 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. 0.5m fixed BNC output cable terminated in BNC plug. 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 Mini50HF is as robust as possible. To prolong the life of the coil please observe the following handling instructions. Releasing The Coil The free end of the coil is unclipped by applying gentle pressure in the direction shown. -
Page 8: Safety And Pre-Use Checks
The voltage rating (safe PEAK working voltage) is clearly labelled on the coil. For the CWT Mini50HF this is either 2kV 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: Power Options
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 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: Obtaining The Best Measurement
OBTAINING THE BEST MEASUREMENT The Rogowski coil should be positioned so that the conductor under test is encircled by the coil but is not adjacent to the cable attachment (see picture below). Arrows near the ferrule indicate the direction a positive current should flow through the coil loop in order to obtain a positive output voltage. -
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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