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IM CW120-E
Product Overview
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Chapter 1. Product Overview
1.1 Product Overview
The CW120/121 clamp-on power meters measure the fundamental electric
power factors, namely, instantaneous power-related values and electric
energy (watt-hours).
• CW120: Supports single-phase two-wire, single-phase three-wire, and
three-phase three-wire circuits.
• CW121: Supports single-phase two-wire, single-phase three-wire, three-
phase three-wire, and three-phase four-wire circuits.
The following explains the features of the CW120/121, shows a schematic
diagram of their functions, and describes the contents displayed on the
screen in each measurement mode.
Features
● A Wealth of Functions
• Fast data saving for a long time: Data can be saved at 1-second intervals
at fastest. A PC card slot for large removable memories such as flash
ATA and compact flash cards allows measurement over a long time.
• Instantaneous value saving: Simply pressing the SAVE key will save the
measured values.
• Wiring error check: The connections are checked and any error is
displayed before the start of measurement.
● Broad Ranges
• Voltage range: 150/300/450 V
• Current range: 4 types of clamp-on probes can be used.
96033 clamp-on probe: 5/10/20/50 A
96030 clamp-on probe: 20/50/100/200 A
96031 clamp-on probe: 50/100/200/500 A
96032 clamp-on probe: 200/500/1000 A
● Ease of Data Processing and Communication
Data can be saved to a PC card. Via communication, data can be
transferred to a personal computer and the measurement conditions can
be set from a computer. As the communication interface, you can choose
(when ordering) RS-232 or RS-485; the RS-485 interface allows multiple
CW120s and CW121s to be connected on the same line for remote
monitoring.
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