Yokogawa CW240 Operating Manual

User's

Manual

CW240

Clamp-on Power Meter

IM CW240E

IM CW240E 1st Edition: June 2004 (KP)

Index

Introduction .....................................................................................		1
Checking the Contents of the Package........................................		2
Precautions for Safe Use of the Instrument ................................		6
Utilisation en Toute Securite .........................................................		9
Chapter 1	Product Overview ...................................	1-1
1.1	Product Overview ..............................................................	1-2
1.2	System Configuration Diagram ........................................	1-4
Chapter 2 Part Names and How to Use Parts .........		2-1
2.1	Front Panel and Connector Block ....................................	2-2
2.2	Operation Keys ..................................................................	2-3
2.3	Side Faces ..........................................................................	2-4
2.4	Screen Configuration ........................................................	2-5
2.5	Overrange/Error Indication during Measurement ...........	2-6
2.6	Description of Mark Indication .......................................	2-11
Chapter 3 Preparation for Safe Measurements ......		3-1
3.1	Precautions for Use ...........................................................	3-2
3.2	Connecting a Power Supply .............................................	3-4
3.3	Connecting Voltage Probes ............................................	3-14
3.4	Connecting Clamp-on Probes ........................................	3-15
3.5	Connection Diagrams of Voltage Probes and
	Clamp-on Probes .............................................................	3-17
3.6	Turning ON the Power Switch .........................................	3-22
3.7	Performing Measurements with Greater Precision ......	3-24

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Index

Chapter 4	Wiring ........................................................	4-1
4.1	Precautions for Wiring to the Measurement Circuit .......	4-2
4.2	Installing the CW240 ..........................................................	4-3
4.3	Setting up Wiring ...............................................................	4-5
4.4	Setting up the Number of Loads ......................................	4-6
4.5	Carrying out Wiring ...........................................................	4-7
4.6	Wiring the Measurement Circuit
	Using External VT/CT ......................................................	4-23
4.7	Checking Wiring ...............................................................	4-24

Chapter 5 Setting Ranges Using the Direct Keys...		5-1
5.1	Setting the Voltage Range .................................................	5-2
5.2	Setting the Current Range ................................................	5-4
5.3	Ranges and Number of Digits ...........................................	5-6

Chapter 6	Configuring Settings ...............................	6-1
6.1	Settings ...............................................................................	6-2
6.2	General Settings 1/2 ..........................................................	6-6
6.3	General Settings 2/2 ........................................................	6-21
6.4	Save Data Settings 1/2 .....................................................	6-46
6.5	Save Data Settings 2/2 .....................................................	6-62
6.6	Communication Settings .................................................	6-67
6.7	Voltage Quality Settings ..................................................	6-72
6.8	Hardware Settings ...........................................................	6-76
6.9	Analog I/O Settings ..........................................................	6-88

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IM CW240E

		Index
Chapter 7	Measurements ..........................................	7-1
7.1	Measurements ....................................................................	7-2
7.2	Measure Screens ...............................................................	7-3
7.3	Measuring Electric Energy ..............................................	7-13
7.4	Measuring Demand ..........................................................	7-17
7.5	Displaying Zoom (Expanded View) ................................	7-21
7.6	Measuring Harmonics .....................................................	7-24
7.7	Displaying Waveform .......................................................	7-34
7.8	Measuring Voltage Quality (Voltage Dip,
	Voltage Swell, or Instantaneous Interruption) ...............	7-40
7.9	Checking Settings ............................................................	7-43
7.10	Clearing Integrated Data .................................................	7-45
7.11	Measurement Data ...........................................................	7-46
Chapter 8 Saving Measured Data.............................		8-1
8.1	Data Save ............................................................................	8-2
8.2	Saving Measured Data .......................................................	8-6
8.3	Memory (Reference) ........................................................	8-11
8.4	Backup Memory ...............................................................	8-13
8.5	Copying Screen Data (Hard copy) ..................................	8-15
Chapter 9	Processing File(s) ....................................	9-1
9.1	File Processing ..................................................................	9-2
9.2	Changing a File Name .......................................................	9-4
9.3	Deleting a File .....................................................................	9-6
9.4	Formatting ..........................................................................	9-9
9.5	Data Copy .........................................................................	9-10
9.6	Setting Files (Load/Save/Delete/Name Change) ...........	9-14
9.7	Backup Memory Copy .....................................................	9-24
9.8	Backup Memory Delete ...................................................	9-25
Chapter 10 Using the Communication Function
	(RS-232) ..................................................	10-1
10.1	Description of the Communication Function ................	10-2
10.2	Using a Personal Computer ............................................	10-4
10.3	Using a Printer .................................................................	10-6

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Index

Chapter 11	PC Card ...................................................	11-1
11.1	PC Card Specifications ...................................................	11-2
11.2	Inserting and Removing the PC Card ............................	11-3
11.3	Formatting the PC Card ...................................................	11-4
11.4	Saving in the PC Card .....................................................	11-5

Chapter 12 Using External Control Input/Output ...		12-1
12.1	External Control Input/Output ........................................	12-2
12.2	Connecting External Control Terminals.........................	12-3
12.3	Using Multiple CW240 Units in Synchronization ..........	12-4
Chapter 13 Using Analog Input/Output
	(Optional) ................................................	13-1
13.1	Analog Output (DA Output) .............................................	13-2
13.2	Analog Input .....................................................................	13-6
13.3	Connecting Analog Input/Output Terminals ..................	13-8
Chapter 14	Power Failure Processing Function .....	14-1
Chapter 15	Other Functions .....................................	15-1
15.1	Holding the Display Value ...............................................	15-2
15.2	Turning the LCD Backlight ON and OFF ........................	15-3
15.3	Locking the Keys .............................................................	15-4
15.4	Resetting the System ......................................................	15-5
Chapter 16	Maintenance Troubleshooting ..............	16-1
16.1	Things to Check When There is a Malfunction .............	16-2
16.2	Error Message Content and Actions .............................	16-4
Chapter 17	CW 240 Specifications...........................	17-1
17.1	CW 240 Specifications .....................................................	17-2
17.2	Specifications of Current Clamps
	(Clamp-on Probe) ...........................................................	17-17

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IM CW240E

		Index
Appendix 1 Block Diagram ..................................		App.1-1
Appendix 2 File/Print Item Descriptions ............		App.2-1
Appendix 3 Polarity (Active Power, Reactive Power,
	Power Factor, Phase Angle) ............	App.3-1
Appendix 4	Polarity
	(Harmonic Measurement) ................	App.4-1
Appendix 5	Reactive Power Method...................	App.5-1
Appendix 6	Sampling Method .............................	App.6-1
Appendix 7	Terminolo ......................................	App.7-1

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Introduction

Introduction

Thank you for purchasing our CW240 Clamp-on Power Meter. This User's Manual describes the functions of the CW240 as well as its operating methods and handling precautions. Read this manual thoroughly before using the CW240, to ensure correct use.

In addition to this manual, the Quick Setup Manual and Communication Function Manual (CD-ROM) are available separately. The Quick Setup Manual briefly describes the basic procedures for performing such tasks as setup and measurement operations. Use the Quick Setup Manual together with this indepth User's Manual. For more information on the communication functions, see the Communication Function Manual (CD-ROM).

After reading this manual, always keep it in an easily accessible convenient place for later reference. This manual will come in handy when you are unsure of how to operate the product.

Notices

The contents of this manual are subject to change without prior notice. In addition, figures and illustrations representing display views in this manual may differ from actual views.

Every effort has been made to ensure accuracy in the preparation of this manual. However, should any doubts arise or errors come to your attention, please contact one of the Yokogawa M&C sales offices listed on the back cover of this manual, or the sales representative from whom you purchased the product.

The contents of this manual may not be transcribed or reproduced, in part or in their entirety, without prior permission.

Trademark Acknowledgments

The company and product names referred to in this document are either trademarks or registered trademarks of their respective holders.

Revision Information

First Edition: June, 2004

Disk No. CW240E

1st Edition: June, 2004 (KP)

All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation

IM CW240E

1

Checking the Contents of the

Package

After opening the package, be sure to check the product as instructed below before use. Should the product you have received be the wrong model, lack any items, or show any problems in its appearance, contact the vendor from whom you purchased the product.

Instrument Main Unit

Check the model name where MODEL is printed on the nameplate located at the back of the CW240 to ensure that the CW240 is exactly as specified in your purchase order.

Model and Suffix Codes

Model	Suffix Code			Specifications
CW240
AC adapter		-D		Power cord: UL/CSA standard
		-F		VDE standard
		-R		SAA standard
		-S		BS standard
Option codes			/DA	D/A output and analog input
			/C1	Clamp-on current probe for 96030, 2 pcs./set
			/C2	Clamp-on current probe for 96030, 4 pcs./set
			/C3	Clamp-on current probe for 96031, 2 pcs./set
			/C4	Clamp-on current probe for 96031, 4 pcs./set
			/C5	Clamp-on current probe for 96032, 2 pcs./set
			/C6	Clamp-on current probe for 96032, 4 pcs./set
			/C7	Clamp-on current probe for 96033, 2 pcs./set
			/C8	Clamp-on current probe for 96033, 4 pcs./set
			/C9	Clamp-on current probe for 96036, 2 pcs./set
			/C10	Clamp-on current probe for 96036, 4 pcs./set
			/C11	Clamp-on current probe for 96034, 2 pcs./set
			/C12	Clamp-on current probe for 96034, 4 pcs./set
			/C13	Clamp-on current probe for 96035, 2 pcs./set
			/C14	Clamp-on current probe for 96035, 4 pcs./set
			/PM1	NiMH battery pack + carrying case

No. field: denotes the product number.

Refer to this number when inquiring about the product to the vendor.

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IM CW240E

Checking the Contents of the Package

Accessories

Make sure that the package contains all the accessories listed below and that they are all free from any damage.

Product Name		Part No.	Q'ty	Remarks
1.	AC adapter for	788011	1set	Yokogawa's AC adapter
	power supply
2.	AA-size alkaline	-	6
	batteries
3.	Voltage probes	91007	4	Color: black, red, yellow, blue
4.	User's Manual	IM CW240	1
5.	Quick Setup	IM CW240P	1
	Manual
6. CD-ROM			1
1.		2.		3.

4.

5.

6.

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3

Checking the Contents of the Package

Peripherals (Optional)

The products listed below are available as optional peripherals. For technical and ordering inquiries concerning peripherals, contact the vendor from whom you purchased the product. If the product you purchased includes any one of the optional peripherals, make sure it is free from any damage.

Product Name	Part No.	Min. Order Q'ty		Remarks
Clamp-on Probe
for 200 A	96030	1
for 500 A	96031	1
for 700 A	96032	1
for 50 A	96033	1
for 3000 A	96034	1	Large-diameter type
			Selectable from 3000 A, 2000 A,
			and 1000 A
for 3000 A	96035	1	Flexible type
			Selectable from 3000 A and 300 A
for 2 A	96036	1
Voltage probe	91007	1 set	4
Carrying case	93020	1
AC adapter	788011	1 set	Yokogawa's AC adapter
NiMH battery pack	94004
AC adapter for 96035	A1020UP	1	For clamp-on Probes
Printer	97010	1
AC adapter (for printer, Europe)
	94006	1
AC adapter (for printer, USA)
	94007	1
Thermal paper for printer	97080	10 rolls
Memory card
(with a PC card adapter)
16 MB	97030	1
32 MB	97031	1
128 MB	97033	1
256 MB	97034	1
512 MB	97035	1

TIP

It is advisable that the packing box be saved, as it is useful when you transport the product.

4

IM CW240E

Checking the Contents of the Package

Housing the CW240 Main Unit and Accessories

An optional carrying case can accommodate the CW240 main unit with its clamp-on probes and voltage probes connected to the unit. The case can also house such accessories as the memory card, AC adapter, and User's Manual. As such, it comes in handy for transporting a complete kit of tools necessary for making measurements.

● Example of Housing:

User's Manual

Clamp-on probes

CW240 main unit

NiMH battery pack

AC adapter

Voltage probes

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5

Precautions for Safe Use of the Instrument

When operating the instrument, be sure to observe the cautionary notes given below to ensure correct and safe use of the instrument. If you use the instrument in any way other than as instructed in this manual, the instrument’s protective measures may be impaired. Yokogawa M&C Corporation is by no means liable for any damage resulting from use of the instrument in contradiction to these cautionary notes.

The following safety symbols are used on the instrument and in this manual.

Danger! Handle with Care.

This symbol indicates that the operator must refer to an explanation in the

User's Manual in order to avoid risk of injury or death of personnel or damage to the instrument.

Hazardous Voltage

The operator must never attempt to touch equipment or parts marked with this symbol.

Direct Current

This symbol indicates DC voltage/current.

Alternating Current

This symbol indicates AC voltage/current.

ON

This symbol indicates On (power).

OFF

This symbol indicates Off (power).

Double insulation

This symbol indicates double insulation.

WARNING

Indicates a hazard that may result in the loss of life or serious injury of the user unless the described instruction is abided by.

CAUTION

Indicates a hazard that may result in an injury to the user and/or physical damage to the product or other equipment unless the described instruction is abided by.

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IM CW240E

Precautions for Safe Use of the Instrument

NOTE

Indicates information that is essential for handling the instrument or, should be noted in order to familiarize yourself with the instrument’s operating procedures and/or functions.

TIP

Indicates information that complements the present topic.

SEE ALSO

Indicates the reference location(s) for further information on the present topic.

Strictly observe the following cautionary notes in order to avoid the risk of injury or death of personnel or damage to the instrument due to hazards such as electrical shock.

WARNING

● Removal of the Case from the Instrument

•Do not remove the case from the instrument or disassemble/modify the instrument itself.

•Some parts of the inside of the instrument contain high voltage and, therefore, access to the internal assembly is extremely hazardous. For inspection and/or adjustment of the internal assembly, contact the vendor from which you purchased the instrument.

●Use of the Instrument in a Gaseous Atmosphere

Do not operate the instrument in a location where any flammable or explosive gas/vapor is present. It is extremely hazardous to operate it in such an atmosphere.

●Inspection of Power Source

•Before turning on the instrument, always make sure the voltage of the power source to be applied matches the instrument's supply voltage.

•When using alkaline batteries or an NiMH battery pack, carefully read the cautionary notes on battery handling later in this manual.

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7

Precautions for Safe Use of the Instrument

WARNING

● Use of Clamp-on Current Probes

•When using clamp-on current probes, keep the circuit voltage below operating circuit voltage in order to avoid possible shorts or accidents resulting in an injury or death.

•Ensure that the rated current of the circuit you measure matches the rating of the current probe.

•Avoid using the instrument if it has been exposed to rain or moisture, or if your hands are wet.

•Do not use clamp-on current probes with any non-insulated conductors.

● Handling of Power Cord

•Use only the cord supplied from Yokogawa M&C to prevent electric shocks and fire.

•Do not place any load on the power cord or allow the power cord to come into accidental contact with any heat source. When unplugging the power cord from the outlet, hold its plug, rather than holding and pulling the cord itself.

•If the power cord is damaged, contact the vendor from which you purchased the instrument.

● Measures in Case of Anomalies

If the instrument begins to emit smoke, becomes too hot, or gives off an unusual smell, immediately turn it off and disconnect the power cord from the outlet. Also turn off power to the object under measurement that is connected to the instrument’s input terminals. Never attempt to use the instrument again. If any such anomalies as noted above occurs, contact the vendor from which you purchased the instrument. Do not attempt to repair the instrument yourself, as doing so is extremely dangerous.

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IM CW240E

Utilisation en Toute Securite

Les précautions suivantes doivent être prises pendant l'exploitation, la maintenance et les réparations. YOKOGAWA M&C ne pourra en rien être déclaré responsable si ces précautions ne sont pas respectées par l'utilisateur.

● Symboles utilisés sur les appareils et dans les Manuels d'instruction.

Explication: ce symbole indique que l'opérateur doit se reporter à une explication donnée par le manuel d'instruction afin d'éviter un accident au personnel ou de protéger l'appareil.

Haute tension: Ne pas toucher!

Courant continu: Ce symbole indique une tension/intensité C.C.

Courant alternatif: Ce symbole indique une tension/intensité C.A.

MARCHE: Ce symbole indique la mise sous tension.

ARRET: Ce symbole indique la mise hors tension.

Double isolation: Ce symbole indique une double isolation.

AVERTISSEMENT

Indique un danger. Attire l'attention sur une utilisation, sur une procédure qui pourraît

être dangereuse pour le personnel.

ATTENTION

Indique un danger. Attire l'attention sur une utilisation, sur une procédure qui pourraît

être préjudiciable au produit.

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9

Utilisation en Toute Securite

AVERTISSEMENT

● Retrait du boîtier de l'instrument

•Ne pas retirer le boîtier de l'instrument et ne pas essayer non plus de démonter/modifier l'instrument lui-même.

•L'instrument renferme des composants parcourus par des tensions élevées. Il est donc extrêmement dangereux d'accéder à ses circuits internes. Pour vérifier et/ou régler les circuits internes, contacter le revendeur auprès duquel a été acheté l'instrument.

● Utilisation de l'instrument dans une atmosphère gazeuse

Ne pas utiliser l'instrument dans un endroit qui renferme des gaz/vapeurs inflammables ou explosifs. Il est extrêmement dangereux d'utiliser l'instrument dans une telle atmosphère.

● Vérification de la source d'alimentation

•Avant de mettre l’instrument sous tension, toujours s’assure que sa tension correspond à celle de la source d’alimentation.

•En cas d’utilisation de piles alcalines ou d’un accumulateur NiMH, lire attentivement les mises en garde relatives à la manipulation des piles/ accumulateurs, plus loin das ce manuel.

● Utilisation des sondes d'intensité à pince

•Lors de l'utilisation des sondes d'intensité à pince, maintenir la tension du circuit au-dessous de operating circuit voltage afin d'écarter tout risque de court-circuit ou d'accident susceptible de provoquer des blessures qui peuvent éventuellement s'avérer mortelles.

•Assurez-vous d'utiliser un capteur de courant dont le calibre correspond au niveau d'intensité à mesurer.

•Eviter d'utiliser l'instrument si celui-ci a été exposé à la pluie ou à l'humidité, ou encore si vos mains sont humides.

•Ne pas utiliser les sondes d'intensité à pince avec des conducteurs non isolés.

10

IM CW240E

Utilisation en Toute Securite

AVERTISSEMENT

● Manipulation du cordon d'alimentation

•Afin de prévenir tout feu ou choc électrique, n'utilisez que le cordon fourni par Yokogawa M&C.

•Ne déposer aucune charge sur le cordon d'alimentation et éviter tout contact fortuit entre celui-ci et une source de chaleur. Pour débrancher le cordon de la prise secteur, tirer sur sa fiche, mais jamais sur le fil proprement dit. Si le cordon d'alimentation est endommagé, contacter le revendeur auprès duquel a été acheté l'instrument.

● Mesures à prendre en cas d'anomalies

Si l'instrument est brûlant, dégage de la fumée ou une odeur inhabituelle, le mettre immédiatement hors tension et débrancher le cordon d'alimentation de la prise secteur. Mettre également hors tension le circuit sur lequel est effectuée la mesure et qui est raccordé aux bornes d'entrée de l'instrument. Ne surtout pas essayer d'utiliser l'instrument à nouveau. Si l'une de ces anomalies est détectée, contacter le revendeur auprès duquel a été acheté l'instrument. Ne pas essayer de le réparer soi-même, car cela est extrêmement dangereux.

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11

Chapter 1 Product Overview

Chapter 1 Product Overview

1.1	Product Overview .....................................	1-2
1.2	System Configuration Diagram ................	1-4

Chapter 1 Product Overview

1.1 Product Overview

The CW240 is a clamp-on power meter that measures items necessary for various power measurements or power quality analyses to conduct an energysaving diagnosis or ISO 14001 testing.

The measurement items are as shown below and are all measured

simultaneously.
• Voltage rms	Each phase and mean
For three-phase three-wire	: line-to-line voltage or phase voltage from
	the virtual mid-point
For three-phase four-wire	: phase voltage
• Current rms	Each phase and mean
• Power value (active, reactive, and apparent)
	Each phase and total
• Power factor	Each phase and total
• Phase angle	Each phase and total

•Frequency

•Electric energy(active, regenerative, lagging reactive, leading reactive)

•Power demand value

• Harmonics (1st to 50th order)		Voltage rms, current rms, content,
		phase angle, power value, power content,
		and power phase angle
	Indication is available as a list, bar graph,
	and vector diagram.
• Voltage fluctuation	Voltage dip, swell, momentary interruption
(Voltage quality)		Data is saved by a threshold value-based
		trigger.
• Waveform	Voltage and current waveform, full-voltage
	waveform, full-current waveform

Features

● Supporting a Variety of Wiring Methods

•Wiring

Single-phase two-wire, single-phase three-wire, three-phase three-wire twocurrent, three-phase three-wire three-current, and three-phase four-wire systems and Scott connection (three-phase three-wire and single-phase three-wire)

•Loads

Single-phase two-wire systems can support up to four loads; single-phase three-wire or three-phase three-wire two-current systems can support up to two loads (shared voltage).

•Leakage current

In single-phase three-wire or three-phase four-wire systems, neutral line current (leakage current) can also be measured.

1-2

IM CW240E

	1.1 Product Overview
● Wide measurement range
Voltage range:	150 V, 300 V, 600 V, and 1000 V
Current range:	compatible with 7 types of clamp-on current probes

From 200 mA to 3000 A maximum

● Power quality analysis measurement

Power quality analysis can be made using harmonics (1st to 50th order), voltage dip/swell/momentary interruption, and waveform measurement functions.

● Wiring check and setup check

•The wiring check function allows you to check a voltage phase sequence or reverse connection of clamp-on current probes.

•The setup check function allows you to check settings for integration

measurements.

● Data management and communication

•Data can be saved using a personal computer (PC) card.

•Data can be transferred to a PC and setup can be made from the PC through

communications.

● Equipped with 4CH DA outputs and 2CH analog inputs (DC V) (optional)

•Measured values can be converted into DC voltage and then analog-output to a recorder or other devices.

•Analog outputs from a thermometer or illuminometer can be connected to the analog input terminals of the CW240 to measure power data and environmental data together.

1

Overview Product

IM CW240E

1-3

1.2 System Configuration Diagram

series:recorders				"Chapter13,Section6.9"
MV
	and3.5"		(clamps)	DAoutputs(4CH)
Chapter3	3.4		inputs
	"Sections3.5"and		inputs
			Current
	"Sections3.3		Voltage	External control
				input/output
synchronizedmeasurements	usingmultipleinstruments	Externalcontactsignal		"Chapter12"
CW240:

53003 510series thermometerilluminometer	CH)(2inputsAnalog	cardPC	"Chapter11"	Chapter3 batteriesAlkaline	packbatteryNiMH
		"ChapterSection6.9"13,		"3.2.2,3.2.3"
					ENTER	DISP COPY
		METER			ESC	SAVE
		ON POWER				RANGE
		CLAMP-			TOP MENU	A
					LIGHT	RANGE
					START	&STOP
	RS-232			ACadapter		Chapter3 "3.2.1"
PC	Printer		"Chapter10"

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IM CW240E

Chapter 2 Part Names and How to Use Parts

Chapter 2 Part Names and How to Use Parts

2.1	Front Panel and Connector Block ............	2-2
2.2	Operation Keys .........................................	2-3
2.3	Side Faces .................................................	2-4
2.4	Screen Configuration ...............................	2-5

2.5Overrange/Error Indication during

Measurement ............................................	2-6
2.6 Description of Mark Indication ................	2-11

Chapter 2 Part Names and How to Use Parts

2.1Front Panel and Connector Block

Voltage input terminals

Connect the voltage probes to these terminals.

N U1 U2 U3

Current input terminals

Connect clamp-on current probes to these terminals.

CH1 CH2 CH3 CH4

RS-232 connector

Connect a PC or printer using a commercially available cable.

External control I/O terminals

Allows you start or stop integration measurements using an external signal. Also, a signal indicating that an integration measurement is being made is output through these terminals.

Analog input terminals (optional)

Used for DC voltage inputs.

DA output terminals (optional)

Used for DC voltage outputs.

Display unit

Operation keys

2-2

IM CW240E

		2.2	Operation Keys
			F1	F2	F3	F4	F5
	START		TOP				ENTER
	&STOP
			LIGHT MENU			ESC
			RANGE	A RANGE		SAVE	DISP COPY
		Key Name				Functional Description
Function keys				These are setting keys corresponding to the information displayed
	F 1 to F 5			in the bottom of the screen.
START & STOP key				Starts/stops integration measurements.
LIGHT key				Turns the backlight ON/OFF.
				When held down for more than 3 seconds, it locks or unlocks the
				operation keys.
TOP MENU key				Switches the display screen to the Top Menu.
ESC key				Cancels setup conditions or other data.
ENTER key				Confirms setup conditions or other data.
Cursor key				Moves the cursor to the item you wish to select.
U RANGE key				Changes the voltage range.
A RANGE key				Changes the current range.
SAVE key				Manually save or print measured data.
DISP COPY key				Hard-copies information displayed on the screen.
				Copy destination setting: PC card, internal memory, or printer

2

Names Part How and Use to Parts

IM CW240E

2-3

2.3 Side Faces

LED
Lights up while a NiMH
battery pack (optional)
is charged.	PC card slot

	AC adapter jack	Button for extracting
	Connect the AC adapter
		a PC card
	(accessorie) to this jack.

Power switch

:Power OFF

:Power ON

Battery holder

This part holds the alkaline battery holder (accessorie) or NiMH battery holder (optional).

Battery holder lock switch

Used to lock or unlock a battery holder.

2-4

IM CW240E

2.4 Screen Configuration

● Basic Screen Configuration

	F 1	F2		F3	F 4	F 5
START		TOP			ENTER
	LIGHT	MENU		ESC
&STOP			A RANGE	SAVE
		RANGE			DISP COPY

MEASURE screen

SETUP screen

	LIST (instantaneous values)								GENERAL (1/2, 2/2)
	POWER
									SAVE (1/2, 2/2)
	INTEGRATE
									COMMUNICATION
	DEMAND
	ZOOM								VOLT. QUALITY
	HARMONIC								HARDWARE
				[LIST, GRAPH, VECTOR]
									ANALOG I/O (optional)
	WAVEFORM
					U & I WAVEFORM
					U WAVEFORM
					I WAVEFORM
	VOLT. QUALITY
	WIRING DIAGRAM
	WIRING CHECK

2

Names Part How and Use to Parts

FILE screen

FILE NAME CHANGE DELETE FILE FORMAT

DATA COPY SETTING FILE

BACKUP MEMORY COPY BACKUP MEMORY DELETE PROGRAM UPDATE (normally not used)

IM CW240E

2-5

2.5Overrange/Error Indication during Measurement

● Overrange Indication during Measurement

: Conditions for voltage overrange indication

This mark appears if the peak value of an input signal exceeds 300% (180% for a 1000 V range) of the rated voltage range or if the rms value of measured voltage exceeds 110% of the rated range.

: Conditions for current overrange indication

This mark appears if the peak value of an input signal exceeds 400% of the rated current range or if the rms value of measured current exceeds 110% of the rated range.

TIP

•Voltage overrange mark appears if an input signal to one of terminals U1 to U3 satisfied the noted conditions.

•Current overrange mark appears if an input signal to one of terminals CH1 to CH4 satisfies the noted conditions.

Indication of "OR" or "----" symbol

The CW240 indicates "OR" or "----" symbol instead of a usual four-digit value if the measured value meets the noted conditions.

WARNING

The CW240 shows an overrange mark in the maximum range only if the input level exceeds the maximum allowable level. Do not apply any input level higher than the maximum allowable level.

CAUTION

To measure an input signal level exceeding the rated range, use a voltage transformer (VT) or current transformer (CT).

When using a VT or CT, carefully read section 4.5, Wiring the Measurement Circuit Using External VT/CT.

2-6

IM CW240E

2.5Overrange/Error Indication during Measurement

•Instantaneous value, electric energy, demand

Measurement Item	Conditions and Indications
Voltage rms	If the peak value of an input signal exceeds 300% (180% for
	the 1000 V range) of the measurement range, or if the rms
	value of measured voltage exceeds 130% of the rated range,
	"OR" appears.
Current rms	If the peak value of an input signal exceeds 400% of the
	measurement range, or if the rms value of measured current
	exceeds 130% of the rated range, "OR" appears.
Active power	If power input (active, reactive, or apparent) exceeds 130%
Reactive power	of the rated range, "OR" appears. Also, if the measured value
Apparent power	exceeds the maximum displayable digits, 9999, "OR" appears.
Power factor	If the peak value of a voltage input signal exceeds 300%
Phase angle	(180% for a 1000 V range) of the measurement range;
	if the rms value of measured voltage exceeds 130% of the
	rated range; if the peak value of a current input signal
	exceeds 400% of the measurement range; or if the rms value
	of measured current exceeds 130% of the rated range; "----"
	appears.
Frequency	If frequency exceeds 70 Hz, the fixed clock is selected.
Interval electric energy	Even if power input exceeds 130% of the rated range, an
Electric energy	excessive power value (active power, reactive power)
Reactive energy	will be integrated. In this case, however, the accuracy of an
	integrated value is not specified.
Power demand	If a demand input exceeds 130% of the rated range, "OR"
Reactive power demand	appears. Also, if the measured value exceeds the maximum
	displayable digits, 9999, "OR" appears.
Analog input (optional)	If an input exceeds 130% of the rated range, "OR" appears.

2

Names Part How and Use to Parts

IM CW240E

2-7

2.5 Overrange/Error Indication during Measurement

• Harmonics

Measurement Item	Conditions and Indications
Voltage rms	If the peak value of an input signal exceeds 300%
	(180% for a 1000 V range) of the measurement range,
	or if the rms value of measured voltage exceeds 130%
	of the rated range, "OR" appears.
Voltage content	If the peak value of an input signal exceeds 300%
Voltage phase angle	(180% for the 1000 V range) of the measurement range,
	or if the rms value of measured voltage exceeds 130%
	of the rated range, "----" appears.
Current rms	If the peak value of an input signal exceeds 400% of the
	measurement range or if the rms value of measured
	current exceeds 130% of the rated range, "OR" appears.
Current content	If the peak value of an input signal exceeds 400% of the
Current phase angle	measurement range, or if the rms value of measured
	current exceeds 130% of the rated range, "----" appears.
Power value	If a power input exceeds 130% of the rated range,
	"OR" appears.
	Also, if the measured value exceeds the maximum
	displayable digits, 9999, "OR" appears.
Power content	If the peak value of a voltage input signal exceeds
Power phase angle	300% (180% for a 1000 V range) of the measurement
	range; if the rms value of measured voltage exceeds
	130% of the rated range; if the peak value of a current
	input signal exceeds 400% of the measurement range;
	or if the rms value of measured current exceeds 130%
	of the rated range; "----" appears. Also, if the power
	value exceeds the maximum displayable digits, 9999,
	"----" appears.
Total harmonic	If the peak value of a voltage input signal exceeds 300%
distortion of voltage	(180% for a 1000 V range) of the measurement range,
	or if the rms value of measured voltage exceeds 130%
	of the rated range, "----" appears.
Total harmonic	If the peak value of a current input signal exceeds 400%
distortion of current	of the measurement range or if the rms value of
	measured current exceeds 130% of the rated range,
	"----" appears.

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IM CW240E

2.5Overrange/Error Indication during Measurement

●Indication Provided if a Measured Value is Too Small

• Instantaneous value, electric energy, demand

Measurement Item	Conditions and Indications
Voltage	If an input level is below 0.4% of the rated range, the reading
	becomes "0 V".
Current	If an input level is below 0.4% of the rated range, the reading
	becomes "0 A".
Active power	If an input level is 0.17% or less of the rated range, the
	reading becomes "0 W".
Reactive power	If an input level is 0.17% or less of the rated range, the
	reading becomes "0 Var".
Apparent power	If an input level is 0.17% or less of the rated range, the
	reading becomes "0 VA".
Electric energy	If power input is 0.17% or less of the rated range, integration
	stops.
Reactive energy	If reactive power input is 0.17% or less of the rated range,
	integration stops.
Power factor	If the input level of either voltage or current is below 0.4% of
Phase angle	the rated range, "----" appears.
Frequency	If frequency is 40 Hz or less or if the input level of a frequency
	source is 10% or less of the rated range, the fixed clock is
	selected, displaying the set fixed-clock frequency.
Interval electric energy	If power input is 0.17% or less of the rated range, integration
	stops.
Power demand	If power demand is 0.17% or less of the rated range, the
	reading becomes "0 W".
Reactive power	If reactive power demand is 0.17% or less of the rated range,
demand	the reading becomes "0 Var".
Analog input (optional)	If an input level is below 0.4% of the rated range, the reading
	becomes "0 V".

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Names Part How and Use to Parts

IM CW240E

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