Appendix; Chapter 1. Product Overview - YOKOGAWA CW140 User Manual

Chapter 1. Product Overview

1.1 Product Overview
The CW140 clamp-on power meter is basically designed for measuring root-
mean-square voltage and current rms values and thereby electric energy. With its
computing capabilities, the CW140 can measure and analyze a wide variety of
parameters related to electric power.
This section explains the features of the CW140 and shows a schematic diagram
representing the functions of the CW140. It also explains the screen views (i.e.,
measuring objects) presented by each measurement mode of the CW140.
Features
The CW140 has four measurement modes which support continuous
measurement.
• Instant Measure mode (logging)
• Electric Energy Measure mode (integration)
• Demand Measure mode (demand measurement)
• Harmonics Measure mode (logging)
This feature simplifies operations required for the Electric Energy Measure mode
most often used.
• Supports single-phase two-wire systems, single-phase three-wire systems,
• Supports dual-load systems in a single-phase two-wire, single-phase three-
• Measured values or measurement settings can be stored in internal memory
• Allows simultaneous data saving to internal memory and a floppy disk, or
• An optional printer connected externally to the CW140 allows you to print
With an RS-232-C interface, it is possible to transfer data to or receive
measurement settings from a personal computer. The CW140 stores
measurement data in CSV format, facilitating data processing (such as creating
graphs) using commercial spreadsheet software.
• Easy-to-operate Display Screen
You can easily change settings by selecting items highlighted on the screen using
Range keys, Cursor key, and function keys.
The settings check sheet in Appendix 6 lists required setting items for each
measurement mode. Use this sheet for reference and to improve efficiency when
making settings in the field.
IM CW140-E
Supports a variety of measurement modes and continuous
measurement.
Efficient Measurement using the Wh Key
Supports a variety of wiring methods.
three-phase three-wire two-current systems, three-phase three-wire three-
current systems, and three-phase four-wire systems.
wire, or three-phase three-wire configuration (except when in the Harmonics
Measure mode).
Data Management
or on a 3.5-inch floppy disk inserted in an optional floppy drive attached
externally to the CW140.
copying internal memory data to a floppy disk.
measured values or measurement settings.
Communication
Setting Operations
Settings Check Sheet
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