YOKOGAWA WT110, WT130 User Manual

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Digital Power Meter

Yokogawa Electric Corporation

IM253401-01E

3rd Edition

Foreword

Notes

Revisions

AThank you for purchasing the YOKOGAWA WT110 or WT130 Digital Power Meter. This User’s Manual contains useful information regarding the instrument’s functions and operating procedures, as well as precautions that should be observed during use. To ensure proper use of the instrument, please read this manual thoroughly before operating it. Keep the manual in a safe place for quick reference whenever a question arises.

• The peak measurement function and the MATH function described in this manual apply to WT110/WT130 with ROM version 2.01 or later.

• The contents of this manual are subject to change without prior notice.

• Every effort has been made in the preparation of this manual to ensure the accuracy of its

contents. However, should you have any questions or find any errors, please contact your dealer or YOKOGAWA sales office.

• Copying or reproduction of all or any part of the contents of this manual without YOKOGAWA’s permission is strictly prohibited.

First edition: September 1995 2nd edition: March 1997 3rd edition: March 1998

IM 253401-01E

Checking the Contents of the Package

Unpack the box and check the contents before operating the instrument. In case the wrong instrument or accessories have been delivered, or if some accessories are not present, or if they seem abnormal, contact the dealer from which you purchased them.

WT110/WT130 Main Body

Check that the model code and suffix code given on the name plate located at the right side of the main body are according to your order.

WT110 (model code: 253401) WT130 (model code: 253502, 253503)

MODEL

SUFFIX

NO.

Madein Japan

MODEL

SUFFIX

NO.

Made in Japan

Model and Suffix codes

Model code Suffix code Specifications

253401 WT110 Single-phase model 253502 WT130 Three-phase, three-wire model 253503 WT130 Three-phase, four-wire model

Interface -C1 GP-IB interface

-C2 RS-232-C interface Power voltage -0 100-120V/220-240V Power cord -D [Maximum rated voltage: 125V; Maximum rated current: 7A]

Options

External sensor input function /EX1 ... 2.5/5/10V range

Harmonic analysis function /HRM .. – External input/output function /DA4 ... 4 channels D/A output (for 253401)

Ex: WT130 Three-phase, three-wire model, GP-IB interface, with UL/CSA power cord, with

external sensor input 50/100/200mV range, with harmonic analysis function, and 12 channels D/A output →253202-C1-0-D/EX2/HRM/DA12

-F VDE Standard Power Cord (Part No.: A1009WD)

[Maximum rated voltage: 250V; Maximum rated current: 10A]

-J BS Standard Power Cord (Part No.: A1023WD)

[Maximum rated voltage: 250V; Maximum rated current: 5A]

-R SAA Standard Power Cord (Part No.: A1024WD)

[Maximum rated voltage: 240V; Maximum rated current: 10A]

/EX2 ... 50/100/200mV range

/DA12 . 12 channels D/A output (for 253502/253503) /CMP .. Comparator 4 channels, D/A output 4 channels

MODEL

SUFFIX

NO.

Madein Japan

NO. (instrument number)

When contacting the dealer from which you purchased the instrument, please quote the instrument No.

IM 253401-01E

Standard Accessories

The following standard accessories are supplied with the instrument. Make sure that all items are present and undamaged.

Name Part No. Q’ty Remarks

1 Power cord see page 2 1 — 2 Power fuse A1346EF 1 only for the three-phase model

3 24-pin connector A1004JD 1 For remote, D/A output

4 User’s Manual IM253401-01E 1 this manual 5 Rubber feed A9088ZM 1 set 6 Clamp filter (Ferrite core) A1179MN 1 for WT110 only

Checking the Contents of the Package

Time lag, 0.5A, 250V (located in the fuse holder) Not provided with the single-phase model

(only provided with options /DA4, /DA12 or /CMP)

1. One of the power cords is supplied according to the instrument's suffix code

2. 5. 6.

Optional Equipment

The following optional equipment is available. Upon receiving any optional equipment, make sure that all the items ordered have been supplied and they are in good condition. If you have any questions regarding optional equipment, or if you wish to place an order, contact the dealer from whom you purchased the instrument.

Name Parts No. Minimum Q’ty Remarks

Digital printer 740921 1 ESC/P compatible, RS-232-C/Centronics

Note

DFJ R

3. 4.

It is recommended that the packing box be kept in a safe place. The box can be used for transporting the instrument.

IM 253401-01E

Safety Precautions

This instrument is a IEC safety class I instrument (provided with terminal for protective grounding). The following general safety precautions must be observed during all phases of operation, service and repair of this instrument. If this instrument is used in a manner not sepecified in this manual, the protection provided by this instrument may be impaired. Also,YOKOGAWA Electric Corporation assumes no liability for the customer’s failure to comply with these requirements.

The fullowing symbols are used on this instrument.

To avoid injury, death of personnel or damage to the instrument, the operator must refer to an explanation in the User's Manual or Service Manual.

Danger, risk of electric shock

Alternating current

ON(power)

OFF(power)

In-position of a bistable push control

Out-position of a bistable push control

Ground

IM 253401-01E

Safety Precautions

WARNING

Do not Operate in an Explosive Atmosphere

Do not operate the instrument in the presence of flammable liquids or vapors. Operation of any electrical instrument in such an environment constitutes a safety hazard.

Protective Grounding

Make sure to connect the protective grounding to prevent an electric shock before turning ON the power.

Necessity of Protective Grounding

Never cut off the internal or external protective grounding wire or disconnect the wiring of protective grounding terminal. Doing so poses a potential shock hazard.

Defect of Protective Grounding

Do not operate the instrument when protective grounding or fuse might be defective.

Power Cord and Plug

To prevent an electric shock or fire, be sure to use the power cord supplied by YOKOGAWA. The main power plug must be plugged in an outlet with protective grounding terminal. Do no invalidate protection by using an extension cord without protective grounding.

Power Supply

Ensure the source voltage matches the voltage of the power supply before turning ON the power.

External Connection

To ground securely, connect the protective grounding before connecting to measurement or control unit.

Fuse

To prevent a fire, make sure to use fuses with specified standard (current, voltage, type). Before replacing the fuse, turn OFF the power and disconnect the power source. Do not use a different fuse or short-circuit the fuse holder.

Do not Remove any Covers

There are some areas with high voltage. Do not remove any cover if the power supply is connected. The cover should be removed by qualified personnel only.

IM 253401-01E

How to Use this Manual

This User’s Manual consists of 15 chapters, an Appendix and an Index as described below.

Chapter 1 What this Instrument Can Do

Chapter 2 Nomenclature, Keys and Displays

Chapter 3 Before Operation

Chapter 4 Setting Measurement Conditions

Chapter 5 Measuring/Displaying Voltage, Current, and Active Power and Frequency

Chapter 6 Computing/Displaying Apparent Power, Reactive Power, Power Factor and

Chapter 7 Integrating

Chapter 8 Using the Harmonic Analysis Function (option)

Chapter 9 Storing/Recalling

Chapter 10 Using External In/Output

Chapter 11 GP-IB Interface

Chapter 12 RS-232-C Interface

Chapter 13 Other Useful Functions

Chapter 14 Adjustment, Calibration and Trouble-Shooting

Chapter 15 Specifications

Appendix Describes communication commands and sample programs. Index Gives the index in alphabetic order.

Explains the flow of the measurement input signals and gives an outline of the functions.

Gives the name of each part and each key, and describes how to use it. This chapter also gives the displays in case of overrange/error during measurement.

Describes points to watch during use and describes how to install the instrument, wire the measuring circuits, connect the power cord and switch the power ON/OFF.

Explains settings such as measurement mode, filter ON/OFF, measurement range, scaling in case of external PT/CT or external sensor (such as shunt or clamp), averaging and measurement conditions.

Explains the procedures for measuring and displaying voltage, current and active power.

Phase Angle.

Explains the procedures for measuring and displaying apparent power, reactive power, power factor and phase angle.

Explains the procedures for integration of active power and current.

Explains the procedures when using the harmonic analysis function.

Explains the procedures when storing or recalling measured data or setting parameters from the internal memory.

Explains the procedures for remote control, D/A output (option), external plotter/ printer output and comparator (option).

Explains the procedures for controlling the instrument by personal computer and for sending measurement/computed data to a personal computer using the GP-IB interface.

Explains the procedures for controlling the instrument by personal computer/ controller and for sending measurement/computed data to a personal computer/ controller using the RS-232-C interface.

Explains the procedures such as backing up set-up information and initializing settings.

Explains the procedures for calibration, adjustment, the way to verify trouble, the contents of error messages and the way to replace the fuse.

Describes the specifications of the instrument.

IM 253401-01E

Conventions Used in this Manual

Symbols Used

The following symbol marks are used throughout this manual to attract the operator’s attention.

To avoid injury or death of personnel, or damage to the instrument, the operator must refer to the User's Manual. In the User's Manual, these symbols appear on the pages to which the operator must refer.

WARNING

CAUTION

Note

serious injury or death to the user.

Describes precautions that should be observed to prevent the danger of minor or moderate injury to the user, or the damage to the property.

Provides information that is important for proper operation of the instrument.

Displayed Characters on the 7-Segment LED

Describes precautions that should be observed to prevent the danger of

In order to display all numbers and alphabetic characters on the 7-segment LED, some of them are displayed in a slightly altered format. For details, refer to section 1.3.

Markings used for Descriptions of Operations

Relevant Keys

Operating Procedure

Indicates the relevant panel keys and indicators to carry out the operation.

The procedure is explained by a flow diagram. For the meaning of each operation, refer to the example below. The operating procedures are given with the assumption that you are not familiar with the operation. Thus, it may not be necessary to carry out all the steps when changing settings.

Explanation

Describes settings and restrictions relating to the operation.

An example of an Operating Procedure

(Di splay C)

ENTER

(Di splay C)

ENTER

End of setting

SETUP

OUTPUT

SHIFT

The items in this figure are obtained by the following setting procedures. The blinking part of the display can be set.

1. After pressing the SHIFT key and the SHIFT indicator is lit, press the SETUP (OUTPUT) key. The output setting menu will appear on display C.

2. Select rELAY using the up/down keys. Pressing either key, 4 selectable items will be displayed consecutively.

3. Verify the setting by pressing the ENTER key. The setting menu corresponding to the item selected at step 2 will appear at display C.

4. Select oFF or on using the up/down keys. Pressing either key, 6 selectable items will be displayed consecutively.

5. Verify the setting by pressing the ENTER key.

IM 253401-01E

Foreword ............................................................................................................................................................................. 1

Checking the Contents of the Package..................................................................................................... 2

Safety Precautions...................................................................................................................................................... 4

How to Use this Manual .......................................................................................................................................... 6

Conventions Used in this Manual .................................................................................................................. 7

Chapter 1 What this Instrument Can Do

1.1 System Configuration and Block Diagram ..................................................................................1-1

1.2 Functions ...................................................................................................................................... 1-2

1.3 Digital Numbers/Characters, and Initial Menus .......................................................................... 1-5

Chapter 2 Nomenclature, Keys and Displays

2.1 Front Panel, Rear Panel and Top View........................................................................................ 2-1

2.2 Operation Keys and Function/Element Display .......................................................................... 2-2

2.3 Displays in case of Overrange/Error during Measurement ......................................................... 2-4

Chapter 3 Before Operation

3.1 Usage Precautions ........................................................................................................................3-1

3.2 Installing the Instrument .............................................................................................................. 3-2

3.3 Wiring Precautions ...................................................................................................................... 3-4

3.4 Wiring the Measurement Circuit ................................................................................................. 3-5

3.5 Wiring the Measurement Circuit when Using External PT/CT ................................................... 3-7

3.6 Wiring the Measurement Circuit when Using the External Sensor ............................................. 3-9

3.7 Connecting the Power Supply.................................................................................................... 3-12

3.8 Turning the Power ON/OFF ...................................................................................................... 3-13

3.9 Selecting the Wiring Method (for WT130) .............................................................................. 3-15

3.10 Improving the Measurement Accuracy...................................................................................... 3-16

Chapter 4 Setting Measurement Conditions

4.1 Selecting the Measurement Mode................................................................................................ 4-1

4.2 Turning the Filter ON/OFF .......................................................................................................... 4-3

4.3 Selecting the Measurement Range in case of Direct Input ..........................................................4-4

4.4 Setting the Scaling Value when External PT/CT is Used ............................................................ 4-6

4.5 Selecting the Measurement Range and Setting the Scaling Value when External Sensor is

Used (option) ............................................................................................................................... 4-8

4.6 Using the Averaging Function ...................................................................................................4-10

4.7 Using the Four Arithmetical Operation Function (Applies to WT110/WT130 with ROM

Version 2.01 or later) .................................................................................................................4-12

4.8 Computing the Crest Factor (Applies to WT110/WT130 with ROM Version 2.01 or later) ....4-15

4.9 Computing the Efficiency (Applies to WT130 with ROM Version 2.01 or later) .................... 4-16

Chapter 5 Measuring/Displaying Voltage, Current, Active Power, Frequency,

Four Arithmetic Operation Value, Crest Factor and Peak Value

5.1 Measuring/Displaying Voltage, Current and Active Power ........................................................5-1

5.2 Measuring/Displaying Frequency ................................................................................................ 5-3

5.3 Measuring/Displaying Four Arithmetic Operation Value, Crest Factor and Peak Value ........... 5-4

IM 253401-01E

Contents

Chapter 6 Computing/Displaying Apparent Power, Reactive Power, Power

Factor and the Phase Angle

6.1 Computing/Displaying Apparent Power, Reactive Power and Power Factor ............................. 6-1

6.2 Computing/Displaying the Phase Angle ...................................................................................... 6-2

Chapter 7 Integration

7.1 Integrator Functions .....................................................................................................................7-1

7.2 Setting Integration Mode and Integration Timer .........................................................................7-4

7.3 Displaying Integrated Values....................................................................................................... 7-5

7.4 Precautions Regarding Use of Integrator Function...................................................................... 7-7

Chapter 8 Using the Harmonic Analysis Function (optional)

8.1 Harmonic Analysis Function ....................................................................................................... 8-1

8.2 Setting the Element, PLL Source and Harmonic Distortion Method .......................................... 8-3

8.3 Switching the Harmonic Analysis Function ON/OFF .................................................................8-5

8.4 Setting the Harmonic Order and Displaying the Results of Harmonic Analysis......................... 8-6

Chapter 9 Storing/Recalling

9.1 Storing/Recalling Measured Data ................................................................................................9-1

9.2 Storing/Recalling Set-up Parameters ...........................................................................................9-4

Chapter 10 Using External In/Output

10.1 Remote Control and D/A Output Connector (optional)............................................................. 10-1

10.2 Remote Control (optional) .........................................................................................................10-2

10.3 D/A Output (optional)................................................................................................................ 10-3

10.4 Comparator Function (optional) ................................................................................................ 10-7

10.5 Setting the Comparator Mode (optional) ...................................................................................10-9

10.6 Setting the Comparator Limit Values (optional) ..................................................................... 10-10

10.7 Comparator Display (optional) ................................................................................................ 10-14

10.8 Turning the Comparator Function ON/OFF (optional) ........................................................... 10-16

10.9 Outputting to an External Plotter/Printer .................................................................................10-17

Chapter 11 GP-IB Interface

11.1 Using the GP-IB Interface ......................................................................................................... 11-1

11.2 Responses to Interface Messages ............................................................................................... 11-2

11.3 Status Byte Format (before the IEEE488.2-1987 Standard)...................................................... 11-3

11.4 Output Format for Measured/Computed Data, Harmonic Analysis Data, Set-up

Parameters and Error Codes ......................................................................................................11-4

11.5 Setting the Address/Addressable Mode .....................................................................................11-9

11.6 Setting the Output Items .......................................................................................................... 11-10

11.7 Commands (before the IEEE488.2-1987 Standard) ................................................................ 11-12

Chapter 12 RS-232-C Interface

12.1 Using the RS-232-C Interface.................................................................................................... 12-1

12.2 Connecting the Interface Cable.................................................................................................. 12-2

12.3 Setting the Mode, Handshaking Method, Data Format and Baud Rate ..................................... 12-4

12.4 Format and Commands of Output Data (brefore the IEEE488.2-1987 Standard)..................... 12-7

Chapter 13 Other Useful Functions

13.1 Back-up of Set-up Parameters ................................................................................................... 13-1

13.2 Initializing Set-up Parameters.................................................................................................... 13-2

IM 253401-01E

App

Index

Chapter 14 Adjustment, Calibration and Trouble-Shooting

14.1 Adjustments ............................................................................................................................... 14-1

14.2 Calibration ................................................................................................................................. 14-4

14.3 In Case of Malfunctioning ....................................................................................................... 14-10

14.4 Error Codes and Corrective Actions ........................................................................................14-11

14.5 Replacing the Fuse (for WT130) ............................................................................................. 14-13

Chapter 15 Specifications

15.1 Input ...........................................................................................................................................15-1

15.2 Measurement Functions .............................................................................................................15-1

15.3 Frequency Measurement ............................................................................................................15-1

15.4 Communication .......................................................................................................................... 15-1

15.5 Computing Functions ................................................................................................................. 15-2

15.6 Display Functions ...................................................................................................................... 15-2

15.7 Integrator Functions ...................................................................................................................15-2

15.8 Internal Memory Function .........................................................................................................15-2

15.9 D/A Converter (optional) ........................................................................................................... 15-2

15.10 External Input (optional) ............................................................................................................ 15-3

15.11 Comparator Output (optional) ................................................................................................... 15-3

15.12 External Control and Input Signals

(in combination with the D/A converter and comparator options) ............................................15-3

15.13 General Specifications ............................................................................................................... 15-3

15.14 Total Harmonic Analysis Function (optional) ...........................................................................15-3

15.15 External Dimensions ..................................................................................................................15-4

Contents

Appendix 1 Communication Commands (before the IEEE488.2-1987

Standard)

App.1.1 Commands ....................................................................................................................... App1-1

App.1.2 Sample Program............................................................................................................. App1-10

App.1.3 For Users Using Communication Commands of Digital Power Meter 2533E ............. App1-15

Appendix 2 Communication Commands (according to the IEEE488.2-1987

Standard)

App.2.1 Overview of IEEE 488.2-1987 ........................................................................................ App2-1

App.2.2 Program Format ............................................................................................................... App2-2

2.2.1 Symbols Used in Syntax Descriptions ................................................................ App2-2

2.2.2 Messages ............................................................................................................. App2-2

2.2.3 Commands ...........................................................................................................App2-4

2.2.4 Responses ............................................................................................................ App2-5

2.2.5 Data ..................................................................................................................... App2-5

2.2.6 Synchronization with the Controller ................................................................... App2-7

App.2.3 Commands ....................................................................................................................... App2-8

2.3.1 Command List ..................................................................................................... App2-8

2.3.2 AOUTput Group ............................................................................................... App2-11

2.3.3 COMMunicate Group ....................................................................................... App2-12

2.3.4 CONFigure Group .............................................................................................App2-14

2.3.5 DISPlay Group .................................................................................................. App2-17

2.3.6 HARMonics Group ........................................................................................... App2-18

2.3.7 INTEGrate Group ..............................................................................................App2-19

2.3.8 MATH Group .................................................................................................... App2-20

2.3.9 MEASure Group ............................................................................................... App2-21

2.3.10 RECall Group .................................................................................................... App2-27

2.3.11 RELay Group .................................................................................................... App2-28

IM 253401-01E

Contents

2.3.12 SAMPle Group ..................................................................................................App2-30

2.3.13 STATus Group ..................................................................................................App2-31

2.3.14 STORe Group.................................................................................................... App2-32

2.3.15 Common Command Group ...............................................................................App2-33

App.2.4 Status Report .................................................................................................................. App2-35

2.4.1 Overview of the Status Report .......................................................................... App2-35

2.4.2 Status Byte ........................................................................................................ App2-36

2.4.3 Standard Event Register .................................................................................... App2-37

2.4.4 Extended Event Register ................................................................................... App2-38

2.4.5 Output Queue and Error Queue .........................................................................App2-39

App. 2.5 Sample Program .............................................................................................................App2-40

App. 2.6 ASCII Character Codes ................................................................................................. App2-42

App. 2.7 Communication-related Error Messages ....................................................................... App2-43

Index

IM 253401-01E

App

Index

1.1 System Configuration and Block Diagram

System Configuration

Voltage

input

Input either one

Digital

power meter

Contact / relay output

What this Instrument Can Do

Block Diagram

Model INPUT Section 253401 ELEMENT 1

253502 253503

VOLTAGE INPUT

CURRENT INPUT

Equipment

under

test

ELEMENT 1,3 ELEMENT 1,2,3

INPUT ELEMENT 1

A/D

Zero Cross

A/D

Detector

Zero Cross

Detector

LPF

INPUT ELEMENT 2

Ext.

sensor

ISO

Current

input

A/D

interface

Lead/Lag

Detector

EEPROM

Input either one

DSP

WT110

(253401)

WT130

(253502,253503)

SAMPLING

Bus

Arbiter

FREQUENCY

COUNTER × 2 CLOCK

HARMONICS

PLL DMAC RAM

(Option)

Analog output

GP-IB or

RS-232-C

CPU

CLOCK

Bus

Arbiter

Recorder

Computer

Ext. printer

or plotter

CPU

Personal

ROM RAM

KEY&DISPLAY CONTROLLER

GP-IB

RS-232-C

D/A OUTPUT

EEPROM

(Option)

COMPARATOR

(Option)

INPUT ELEMENT 3

This instrument consists of various sections: input (voltage input and current input circuits), DSP, CPU, display and interface section. In the voltage input circuit, the input voltage is formalized by a voltage divider and operational amplifier, then sent to the A/D converter. In the current input circuit, one shunt resistor is used to form a closed circuit. The voltage between both ends of the shunt resistor is amplified and formalized by an operational amplifier and then sent to the A/D converter. This method enables switching of the current range without opening the current measurement circuit, so the current range can be switched while electricitiy is supplied to the circuit. This also enables remote control via communications outputs. The output from the A/D converter in the current input and voltage input circuits is sent to the DSP (Digital Signal Processor) via a photo-isolator, which is used to provide insulation between the current input circuit (or voltage circuit) and the DSP. One DSP is provided for each input element (current/voltage). For example, a total of 3 DSP’s are used for the three-phase, fourwire model (model 253503). The DSP performs averaging of voltage, current and active power for each sampled data sent from the A/D converter. After processing of a certain number of sets of data has been completed, computation of apparent power, reactive power, power factor and phase angle starts. Computation results are then sent from the DSP to the CPU, where computation such as range conversion, sigma computation and scaling is carried out. Control of display and outputs is also performed by the CPU.

IM 253401-01E

1-1

1.2 Functions

Input Functions

Voltage and Current Input Sections

A voltage or current supplied to each input terminal is normalized then sent to the A/D converter, where the voltage or current is converted into digital signals. The digital signals are then sent via photo-isolator to a 16-bits high-speed DSP (Digital Signal Processor) or CPU, where computation of the measured value is carried out.

Frequency Measuring Range

Measurement of DC voltage, current and power as well as AC voltage and current in the frequency range 10Hz to 50kHz.

Filter

This instrument carries out various measurements after synchronizing the frequency of the input signals. Therefore, correct measurements are necessary. Thus, a filter is being applied to the frequency measurement circuit to eliminate noise of waveforms, such as inverted and distortion waveforms.

Wiring Method

The input units for voltage or current measurement are located on the rear panel of this instrument. These units are called input elements. The number of input elements depends on the model, and the possible wiring methods are as follows. The wiring method demonstrates the circuit configuration to measure voltage, current and power and this circuit configuration varies by phase and number of electrical wires.

model number of elements wiring method

253401 1 single-phase, two-wire (1Φ2W) 253502 2 single-phase, two-wire (1Φ2W); single-phase, three-wire

253503 3 single-phase, two-wire (1Φ2W); single-phase, three-wire

Display Functions

This function enables display of measured/computed values using three red high-intensity 7segment LED displays. A total of three values can be displayed at once.

Computing Functions

Apparent Power, Reactive Power, Power Factor and Phase Angle

Based on the measurement values of voltage, current and active power, the values of apparent power, reactive power, power factor and phase angle can be computed.

Scaling Function

When performing voltage or current measurements with an external PT, CT, shunt, external sensor (clamp) or such connected, you can set a scaling factor to the primary/secondary ratio. This is called scaling. This function enables display of the measured values of voltage, current, active power, reactive power, integrated current and integrated power factor in terms of primary-side values.

(1Φ3W); three-phase, three-wire (3Φ3W)

(1Φ3W); three-phase, three-wire (3Φ3W); three-phase, fourwire (3Φ4W); three-voltage, three-current (3V3A)

1-2

Averaging Function

This function is used to perform exponential or moving averaging on the measured values before displaying them in cases where the measured values are not stable.

IM 253401-01E

Four Arithmetic Operation Function (Applies to WT110/WT130 with ROM Version 2.01 or later)

Results from six types of arithmetic operations can be displayed. (A+B, A-B, A*B, A/B, A2/B, A/B2)

Crest Factor Computing Function (Applies to WT110/WT130 with ROM Version 2.01 or later)

Crest factor is determined by peak value/RMS value. Crest factor of the voltage and current are computed and displayed on models that have the peak measurement function.

Peak Measurement Function (Applies to WT110/WT130 with ROM Version

2.01 or later)

This function measures the peak value of the voltage and current. Crest factor (peak value/RMS value) can also be computed and displayed.

Integrator Functions

This function enables integration of active power and current. All measurement values (and computed values) can be displayed, even when integration is in progress, except for the integrated values (watt hour and ampere hour) and elapsed integration time. Since also integrated values of negative polarity can be displayed, the consumed watt hour (ampere hour) value of the positive side and the watt hour value returning to the power supply of the negative side can be displayed seperately.

1.2 Functions

What this Instrument Can Do

Frequency Measurement Function

This function enables measurement of the frequency of input voltage and current. Measuring range is from 10Hz to 50kHz (however, depending on the internal timing of the instrument, measurement might be carried out in the range from 4Hz to 10Hz also).

Harmonic Analysis Function (option)

This function enables computation of voltage, current, active power and so forth of up to the 50th order, the relative harmonic content of harmonic orders and the phase angle of each order compared to the fundamental (first order). This is for one selected input element. Furthermore, the total rms value (fundamental + harmonic) of the voltage, current and active power, and the harmonic distortion factor (THD) can be calculated.

Storage/Recalling of Measured data and Setting Parameters

This function enables the storage of measured data and setting parameters into the internal memory. Furthermore, after recalling measured data or setting parameters, these data can be displayed or output by communication interface.

D/A Output Function (option)

This function enables output of measured values of voltage, current, active power, apparent power, reactive power, power factor and phase angle as a DC analog signal with full scale of ±5V. Output items up to 12 output channels (253401: 4 channels) can be selected.

Comparator Function (option)

This function compares the measured values of voltage, current, active power, apparent power, reactive power, power factor and phase angle and such with preset limit values. When the measured values cross those preset limits, a contact output relay will be activated. Output items up to 4 channels can be set.

IM 253401-01E

1-3

1.2 Functions

Remote Control Functions (option)

External Input

This instrument can be controlled using the following TTL-level, low pulse, logic signals. EXT HOLD (when options /DA4, /DA12, /CMP are installed)

Holds updating of the displayed values or releases the hold status.

EXT TRIG (when options /DA4, /DA12, /CMP are installed)

Updates the displayed values in hold mode.

EXT START (when options /DA4, /DA12 are installed)

Starts integration.

EXT STOP (when options /DA4, /DA12 are installed)

Stops integration.

EXT RESET (when options /DA4, /DA12 are installed)

Resets the integration results.

External Output

This instrument can output the following TTL-level, low pulse, logic signals. EXT BUSY (when options /DA4, /DA12 are installed)

Outputs continuously from integration start through integration stop.

Communication Functions

Either a GP-IB or RS-232-C interface is provided as standard according to the custormer’s preference. Measured/computed data of up to 14 channels can be output. It is also possible to control this instrument from the personal computer.

Output Function to an External Plotter / Printer

Measured/computed data can be printed on an external plotter or printer using the GP-IB or RS232-C interface.

Other Useful Functions

Backup Function of Set-up Parameters

This instrument backs up the set-up parameters (including computed values) in case power is cut off accidentally as a result of a power failure or for any other reason.

Initializing Set-up Parameters

This function enables you to reset the set-up parameters to initial (factory) settings.

1-4

IM 253401-01E

1.3 Digital Numbers/Characters, and Initial Menus

Digital Numbers/Characters

This instrument is equipped with a 7-segment LED which imposes some restrictions on the usable characters. The numbers/characters are styled as follows.

0 1 2 3 4 5 6 7 8 9

Initial Menus

Every function of this instrument can be set using the menus on the display. The initial displays which appear when the operation keys are pressed, are shown below.

• Voltage Range Setting

V RANGE

A B C D E F G H I J

(Display C)

Small c

Small h

K L M N O P Q R S T

U V W X Y Z

− × ÷

What this Instrument Can Do

• Current Range Setting

A RANGE

(Display C)

When equipped with option /EX1 (Display C)

When equipped with option /EX2 (Display C)

• Filter/Scaling/Averaging/Ext. Sensor Input/Initializing Set-up Parameters

(Display C)

(Filter setting) (Averaging setting) (Scaling setting) (Ext. sensor input setting) (Initiallizing set-up parameters)

(Computation, crest factor settings)

SETUP

IM 253401-01E

1-5

1.3 Digital Numbers/Characters, and Initial Menus

• Integration Setting

SHIFT

RESET

INTEG SET

( Display C )

• Turning the Harmonic Analysis Function ON/OFF

(Setting integration mod) (Setting integration timer) (Setting integration preset time)

SHIFT

START

HARMONICS

(Display C)

(Setting the element) (Setting PLL source) (Setting computation methood

of harmonic distortion)

• Storing/Recalling to/from Internal Memory

SHIFT

STOP

MEMORY

( Display C )

(Storing measurement data) (Recalling measurement data) (Storing set-up parameters) (Recalling set-up parameters)

• Setting Output

( Display C )

(Setting comm./plotter/printer output) (Execute plotter/printer output) (Setting D/A output) (Comparator setting:relay output setting)

SHIFT

SETUP

OUTPUT

• Setting Communication Interface (GP-IB)

SHIFT

LOCAL

INTERFACE

( Display C )

(Setting addressable mode A) (Setting addressable mode B) (Setting talk-only mode) (Print mode setting:setting plotter/printer output) (Setting communication commands according to IEEE 488.2-1987)

• Setting Communication Interface (RS-232-C)

SHIFT

LOCAL

INTERFACE

( Display C )

(Setting normal mode) (Setting talk-only mode) (Print mode setting:setting plotter/printer output)

(Setting communication commands according to IEEE 488.2-1987)

1-6

IM 253401-01E

2.1 Front Panel, Rear Panel and Top View

Front Panel

WT110 (253401) WT130 (253502, 253503)

7-segment display

power switch

page 3-13

function/unit/element display

ventilation slot

GP-IB or RS-232-C connector

Rear Panel

7-segment display

function/unit display

operation keys

page 2-2

handle

power switch

page 3-13

ventilation slot

WT110 (253401) WT130 (253502, 253503)

External sensor input terminal

page 3-9, 3-10

Current input terminal

page 3-5 to 3-8

Voltage input terminal

page 3-5 to 3-8

Current input terminal

page 3-5 to 3-8

Voltage input terminal

page 3-5 to 3-8

operation keys

page 2-3

chapter 11, 12

Ext. in/output connector

chapter 10

Nomenclature, Keys and Displays

Top View

power connector

Ext. in/output connector

GP-IB or RS-232-C connector

chapter 11, 12

page 3-12

chapter 10

External sensor input terminal

page 3-9, 3-10

power connector

page 3-12

power fuse

page 14-13

WT110 (253401) WT130 (253502, 253503)

rear panelrear panel

ventilation slot ventilation slot

IM 253401-01E

front panel front panel

2-1

2.2 Operation Keys and Function/Element Display

WT110 (253401): Operation keys and function display

Indicators for operation conditions

Shows sampling, voltage/current overrange and measurement mode

V RANGE

Shows the voltage range setting menu (page 4-4)

A RANGE

Shows the current range setting menu (page 4-4, 4-8)

V RANGE

SHIFT

MODE

Switches between modes (page 4-1)

AUTO indicator

Lights up when range is AUTO

FUNCTION

Sets the displayed function (Ch. 5, 6)

Function/unit display

SCALING

AVG

FILTER

STORE

RECALL

HARMONICS

MODE

SAMPLE

V OVER

A OVER

RMS

V MEAN

hour

min sec

min

START

HARMONICS

SHIFT

Shows the setting menu for harmonics ON/OFF, PLL source, and element selection (Ch. 8)

STOP

SHIFT

MEMORY

Shows the setting menu for storing/recalling measurement data and set-up information (Ch. 9)

LOCAL

When the REMOTE indicator is lit, the remote function will be canceled. When the REMOTE indicator is not lit, the setting menu for communication/printing will appear

VVA Ak

VPF Ak

VHz Ak

var

TIME

deg

FUNCTION

AUTO AUTO

V RANGE A RANGE HOLD

MODE

STOP RESET

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

SETUP

INTERFACE OUTPUT

HOLD

Keeps the displayed value, and the HOLD indicator will light up. Pressing once again will result in canceling HOLD

HOLD

SHIFT

When in the HOLD situation this results in updating the displayed value

TRIG

For decreasing the voltage/current range, and for setting of functions/values

For increasing the voltage/current range, and for setting of functions/values

ENTER

For verifying the set range/function/value

SHIFT

Moves the cursor of a value from left to right

TRIG

SHIFT

ENTER

INTEGRATOR

Moves the decimal point from left to right

START

Starts integration

SHIFT

STOP

Stops integration

RESET

Integration value and elapsed time of integration are set to zero(0)

SHIFT

Shows the setting menu for integration mode/time, and rated integration time (Ch. 7)

RESET

INTEG SET

2-2

LOCAL

INTERFACE

SHIFT

Shows the setting menu for communication/printing (Ch. 11, 12)

SETUP

SHIFT

Shows the setting menu for communication output items, D/A output, plotter /printer output and comparator output (Ch. 10 to

12)

OUTPUT

SETUP

For settings such as initializing settings, filter, average, scaling, computing and ext. sensor input (Ch. 4)

Indicators for operating functions

When a function is set and in operation, this indicator will light up

IM 253401-01E

2.2 Operation Keys and Function/Element Display

WT130 (253502, 253503): Operation keys and function / element display

Indicators for operation conditions

Shows sampling, voltage/current overrange and measurement mode

V RANGE

Shows the voltage range setting menu (page 4-4)

A RANGE

Shows the current range setting menu (page 4-4, 4-8)

V RANGE

SHIFT

Switches between modes (page 4-1)

MODE

AUTO indicator

Lights up when range is AUTO

ELEMENT

Sets the input element for measurement/integration. The corresponding indicator will light up (Ch. 5, 6)

FUNCTION

Sets the displayed function (Ch. 5, 6)

Function/unit display

MODE

SAMPLE

V OVER

A OVER

RMS

V MEAN

SCALING

hour

AVG FILTER

hour

min sec

STORE

min

VVA Ak

VPF Ak

VHz Ak

RECALL

START

HARMONICS

SHIFT

Shows the setting menu for harmonics ON/OFF, PLL source, and element selection (Ch. 8)

STOP

SHIFT

MEMORY

Shows the setting menu for storing/recalling measurement data and set-up information (Ch. 9)

LOCAL

When the REMOTE indicator is lit, the remote function will be canceled. When the REMOTE indicator is not lit, the setting menu for communication/printing will appear

var

FUNCTION

TIME

deg

FUNCTION ELEMENT

HARMONICS

123

ELEMENT

123

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

STOP RESET

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

SETUP

INTERFACE OUT PU T

3Φ3W

1Φ3W 3Φ4W

3V3A

HOLD

Keeps the displayed value, and the HOLD indicator will light up. Pressing once again will result in canceling HOLD

HOLD

SHIFT TRIG

When in the HOLD situation this results in updating the displayed value

For decreasing the voltage/current range, and for setting of functions/values

For increasing the voltage/current range, and for setting of functions/values

ENTER

For verifying the set range/function/value

SHIFT

Moves the cursor of a value from left to right

TRIG

ENTER

INTEGRATOR

SHIFT

Moves the decimal point from left to right

START

Starts integration

SHIFT

WIRING

STOP

Stops integration

RESET

Integration value and elapsed time of integration are set to zero(0)

SHIFT

RESET

INTEG SET

Shows the setting menu for integration mode/time, and rated integration time (Ch.7)

WIRING

Sets the connection format matching the connection to the voltage/current input terminals at the rear (page 3-15)

Nomenclature, Keys and Displays

IM 253401-01E

LOCAL

INTERFACE

SHIFT

Shows the setting menu for communication/printing (Ch. 11, 12)

SETUP

SHIFT

OUTPUT

Shows the setting menu for communication output items, D/A output, plotter / printer output and comparator output (Ch. 10 to 12)

SETUP

For settings such as initializing settings, filter, average, scaling and ext. sensor input (Ch. 4)

Indicators for operating functions

When a function is set and in operation, this indicator will light up

2-3

2.3 Displays in case of Overrange / Error during Measurement

Overrange display

Overrange occurs when the measured voltage or current exceeds 140% of the rated measurement range. In that case the range will automatically be increased, however up to 140% of the maximum range. When this level is exceeded, the overrange display wil appear, which looks as follows.

Computation over display

When the computed value becomes too high during the computation process, the following display will appear.

Peak over display

When the sampled data (instantaneous voltage or instantaneous current) exceed approx. 300% of the measurement range, the “V over” or “A over” indicators at the front panel will light up.

V OVER

A OVER

Note

The “V over” and “A over” indicators at the front panel will light up in case of overrange or peak-over of any signal which is input to the elements.

Display in case the measurement value is too small

In case either the measured voltage or measured current drops below 0.5% of the measurement range, the display will indicate as follows. This is only in case the measurement mode is RMS or V MEAN.

Function Display

V(voltage) A(current) displays zero var(reactive power)

PF(power factor) deg(phase angle)

Interruption during measurement

If the measurement range, or function/element is changed and the contents of the display changes, the display will indicate as follows.

2-4

IM 253401-01E

3.1 Usage Precautions

Safety Precautions

Before using the instrument for the first time, make sure you have read the safety precautions on page 4 and 5.

Do not remove the case from the instrument. Some areas in the instrument use high voltages, which are extremely dangerous. When the instrument needs internal inspection or adjustment, contact your nearest YOKOGAWA representative. Addresses may be found on the back cover of this manual.

If you notice smoke or unusual odors coming from the instrument, immediately turn OFF the power and unplug the power cord. Also turn OFF the power to all the objects being measured that are connected to the input terminals. If such an irregularity occurs, contact your nearest YOKOGAWA representative. Addresses may be found on the back cover of this manual.

Do not place anything on the power cord and keep it away from any heat generating articles. When unplugging the power cord from the power outlet, always hold the plug and pull it, never pull the cord itself. If the power cord becomes damaged, contact your nearest YOKOGAWA representative. Addresses may be found on the back cover of this manual.

General Handling Precautions

Never place anything on top of the instrument, especially objects containing water. Entry of water into the instrument may result in breakdowns.

When Moving the Instrument

First turn off the power of the objects to be measured and disconnect the connected cables such as for measurement and communication. Then turn off the power switch and unplug the power cord from the power outlet. Always carry the instrument by the handles as shown below.

Before Operation

WT110 (253401) WT130 (253502, 253503)

To prevent internal temperature rise, do not block the vent holes in the instrument case.

Keep input terminals away from electrically charged articles as they may damage internal circuits.

Do not allow volatile chemicals to come into contact with the case or operation panel. Also do not leave any rubber or vinyl products in contact with them for prolonged periods. The operation panel is made of thermoplastic resin, so take care not to allow any heated articles such as a soldering iron to come in contact with it.

For cleaning the case and the operation panel, unplug the power cord first, then gently wipe with a dry, soft and clean cloth. Do not use chemicals such as benzene or thinner, since these may cause discoloration or damage.

IM 253401-01E

If the instrument will not be used for a long period, unplug the power cord from the AC outlet.

3-1

3.2 Installing the Instrument

Turning axis

Fixed positions of the handle (We recommend the positions 1, 3, 5, or 8. When using no 4, don´t put any weight on the instrument.)

Turn the stands after pulling them approx. 2-3 mm on both sides.

Installation Conditions

The instrument must be installed in a place where the following conditions are met.

Ambient temperature and humidity

Ambient temperature: 5 to 40˚C Ambient humidity: 20 to 80% RH (no condensation)

Horizontal position

The instrument must be installed horizontally. A non-horizontal or inclining position can impede proper measurement of the instrument.

Well-ventilated location

Vent holes are provided on the top and bottom of the instrument. To prevent rise in internal temperature, do not block these vent holes. In case you removed the feet for rack-mounting the instrument, make sure to keep a space of at least 20mm as not to block the vent holes.

Never install the instrument in any of the following places

• In direct sunlight or near heat sources;

• Near noise sources such as high voltage equipment or power lines ;

• Where an excessive amount of soot, steam, dust or corrosive gases is present;

• Where the level of mechanical vibration is high;

• Near magnetic field sources;

• In an unstable place.

Note

• To ensure high measurement accuracy, the instrument should only be used under the following conditions. Ambient temperature: 23 ± 5˚C Ambient humidity: 30 to 75% RH (no condensation) When using the instrument in the temperature ranges of 5 to 18 or 28 to 40˚C, add the temperature coefficient to the accuracy as specified in chapter 15 “Specifications”.

• If the ambient humidity of the installation site is 30% or below, use an anti-static mat to prevent generation of static electricity.

• Internal condensation may occur if the instrument is moved to another place where both ambient temperature and humidity are higher, or if the room temperature changes rapidly. In such cases acclimatize the instrument to the new environment for at least one hour before starting operation.

Installation Position

3-2

Desktop

Place the instrument in a horizontal position or tilted using the stand, as shown below.

• WT110 (253401)

When installing using the handle, verify that the handle is in a fixed position. While pulling the handle approx. 2 to 3mm from the turning axes on both side, slowly turn the handle until it slips into the fixed position.

•WT130 (253502, 253503)

IM 253401-01E

3.2 Installing the Instrument

Rack mount

To install the instrument in a rack, use one of the following optional rack mount kits.

• Rack mount kit (option)

Specifications WT110 EIA standard WT110 JIS standard WT110 EIA standard WT110 JIS standard

Kit 751533-E2 751533-J2 751534-E2 751534-J2

Specifications WT130 EIA standard WT130 JIS standard WT130 EIA standard WT130 JIS standard

Kit 751533-E3 751533-J3 751534-E3 751534-J3

• Mounting procedure

1. Remove the handle. For the WT110, turn the handle to position 8 (refer to the picture on the previous page) and remove the handle by pulling it approx. 10mm from the turning axes on both sides. For the WT130, remove the handle by first removing the covers of the handle, and then unfastening the screws.

WT110 (253401) WT130 (253502, 253503)

Turn the handle to

Turning axis

position 8 and remove it by pulling it approx. 10 mm from the turning axes on both sides.

Cover

Before Operation

Cover

Handle

For more detailed information regarding the rack mount procedure, refer to the instruction manual accompanied with the rack mount kit.

2. Remove the feet from the instrument.

3. Remove the seals covering the mounting holes from the front side of the instrument.

4. Mount the rack mount brackets.

5. Mount the instrument in the rack.

Note

When mounting the instrument in a rack, make sure not to block the vent holes. Refer to page 3-2.

IM 253401-01E

3-3

3.3 Wiring Precautions

Max allowable input Voltage input

Current input

Instantaneous max (for 1s)

The peak value is 2000V or the RMS value is 1500V, whichever is less

The peak value is 150A or the RMS value is 40A, whichever is less

Continuous The peak value is 1500V

or the RMS value is 1000V, whichever is less

The peak value is 100A or the RMS value is 30A, whichever is less

WARNING

CAUTION

Note

3-4

• To prevent hazards, make sure to apply a ground protection before connecting the object being measured.

• Always turn OFF the power to the object being measured before connecting it to the instrument. Never connect or disconnect the measurement lead wires from the object while power is being supplied to it, otherwise a serious accident may result.

• When the power switch is ON, never apply a voltage or current exceeding the level specified in the table below to the voltage input or current input terminal. When the power switch is OFF, turn off the power of the instrument under measurement as well. For details regarding the other terminals, such as the external input terminal, refer to chapter 15 “Specifications”.

• In case you are using an external potential transformer (PT) or current transformer (CT), use one which has a sufficient withstand voltage against the voltage to be measured (a withstand voltage of 2E + 1000V is recommended, where E is the measurement voltage.) Also be sure not to allow the secondary side of the CT to go open-circuit while power is supplied, otherwise an extremely dangerous high voltage will be generated on the secondary side of the CT.

• If the instrument is used in a rack, provide a power switch so that power to the instrument can be shut off from the front of the rack in an emergency.

• For safety reasons, make sure that the bare end of the measurement lead wire connected to each input terminal does not protrude from the terminal. Also make sure that the measurement lead wires are connected to the terminals securely.

• The voltage ratings across the measuring (voltage and current) input and the ground for this instrument varies under operating conditions.

• When protective covers are used on GP-IB or RS-232-C and external

input/output connectors;

Voltage across each measuring input terminal and ground 600Vrms max.

• When protective covers are removed from GP-IB or RS-232-C and from

external input/output connectors; or when connectors are used;

Voltage across A, ±(V and A side) input terminals and ground 400Vrms max. Voltage across V terminal and ground 600Vrms max.

• The lead wires must have a sufficient margin in both withstand voltage and current against those to be measured. They must also have insulation resistance appropriate to their ratings. Ex. If measurement is carried out on a current of 20A, use copper wires with a conductor cross-sectional area of at least 4mm

• After completing the wiring of the WT130, the WIRING key needs to be used to select the wiring system before starting measurements. Refer to section 3.9, page 3-15.

• When measuring high currents, or currents or voltages that contain high-frequency components, wiring should be made with special attention paid to possible mutual interference and noise problems.

• Keep the lead wires short as possible.

• For current circuits indicated by thick lines in the wiring diagrams shown in section 3.3, use thick lead wires appropriate for the current to be measured.

• The lead wire to the voltage input terminal should be connected as close to the load of the object under measurement as possible.

• To minimize stray capacitance to ground, route both lead wires and grounding wires so that they are as away from the instrument's case as possible.

IM 253401-01E

3.4 Wiring the Measurement Circuit

• When applying a current to be measured directly to the input terminals of

WARNING

CAUTION

Wiring diagram for single-phase, two-wire system (253401, 253502, 253503)

the instrument, disconnect the input cable of the external sensor. A voltage might be generated by the external sensor input terminal when connected.

• A load current flows in the thick lines show in the diagrams; therefore, a wire with sufficient current capacity must be used for these lines.

SOURCE

LOAD

Before Operation

SOURCE

± A

SOURCE

Input terminal

(ELEMENT)

Input terminal

(ELEMENT)

LOAD

Wiring diagram for single-phase, three-wire system (253502, 253503)

SOURCE

Input terminal

(ELEMENT1)

Input terminal

(ELEMENT3)

Note

The wire connected from the source the ± current terminal must be routed as close as possible to the ground potential in order to minimize measurement error.

LOAD

SOURCE

LOADV

LOAD

IM 253401-01E

3-5

3.4 Wiring the Measurement Circuit

Wiring diagram for three-phase, three-wire system (253502, 253503)

SOURCE

R S T

Input terminal

(ELEMENT1)

Input terminal

(ELEMENT3)

LOAD

SOURCE

Wiring diagram for three-phase, four-wire system (253503)

SOURCE

R S T N

Input terminal

(ELEMENT1)

Input terminal

(ELEMENT2)

Input terminal

(ELEMENT3)

LOAD

SOURCE

Wiring diagram for three-voltage, three-current system (253503)

SOURCE

R S T

Input terminal

(ELEMENT1)

Input terminal

(ELEMENT2)

Input terminal

(ELEMENT3)

LOAD

SOURCE

LOAD

3-6

IM 253401-01E

3.5 Wiring the Measurement Circuit when Using External PT/CT

• When using an external CT, do not allow the secondary side of the CT to

WARNING

go open-circuit while power is supplied, otherwise an extremely high voltage will be generated on the secondary side of the CT.

• A load current flows in the thick lines shown in the diagrams; therefore, a

CAUTION

wire with sufficient current capacity must be used for these lines.

Use of a PT (or CT) enables measurement of voltage or current even if the maximum voltage or maximum current of the object to be measured exceeds the maximum measuring range.

• If the maximum voltage of the object to be measured exceeds 600V, connect an external potential transformer (PT), and connect the secondary side of the PT to the voltage input terminals.

• If the maximum current of the object to be measured exceeds 20A, connect an external current transformer (CT), and connect the secondary side of the CT to the current input terminals.

Wiring diagram for single-phase, two-wire system with PT and CT connected (253401, 253502, 253503)

SOURCE LOAD

Input terminal

(ELEMENT)

SOURCE LOAD

Input terminal

(ELEMENT)

Before Operation

Wiring diagram for single-phase, three-wire system with PT and CT connected (253502, 253503)

IM 253401-01E

SOURCE

CT PT

Input terminal

(ELEMENT1)

CT PT

Input terminal

(ELEMENT3)

Note

• Using the scaling function enables direct reading of measured values on the display. Refer to section 4.4

on page 4-6.

• It must be noted that measured values are affected by the frequency and phase characteristics of PT and

CT.

LOAD

3-7

3.5 Wiring the Measurement Circuit when Using External PT/CT

Wiring diagram for three-phase, three-wire system with PT and CT connected (253502, 253503)

SOURCE

R S

CT PT

LOAD

Input terminal

(ELEMENT1)

Input terminal

(ELEMENT3)

Wiring diagram for three-phase, four-wire system with PT and CT connected (253503)

SOURCE

R S

T N

CT PT

Input terminal

(ELEMENT1)

Input terminal

(ELEMENT2)

Input terminal

(ELEMENT3)

LOAD

Wiring diagram for three-voltage, three-current system with PT and CT connected (253503)

SOURCE LOAD

R S

Input terminal

(ELEMENT1)

Input terminal

(ELEMENT2)

Input terminal

(ELEMENT3)

3-8

IM 253401-01E

3.6 Wiring the Measurement Circuit when Using the External Sensor

• Use an external sensor that is enclosed in a case which has sufficient

WARNING

withstand voltage against the voltages to be measured. Use of bare sensor may cause an electric shock if the sensor is touched accidentally.

• Before connecting an external shunt, make sure the power to the shunt is turned OFF. Always make sure to turn OFF the power switch of the source. When the power is supplied a voltage will be present at the shunt, so don't touch the shunt with your hands.

• When using the clamp sensor, make sure to fully understand the specifications/instruction manual regarding voltages of the measurement circuit and the clamp sensor, and verify that no hazard exists.

• Do not touch the current terminal of the input element and not connect any measurement lead. When power is applied to the measurement circuit, a voltage will be generated at the current terminal, which constitutes a hazard.

• The connector to the input terminal for the external sensor should not have bare wires protruding; make sure to make connections to this terminal according to safety measures, since voltages will be present at the bare wires, which constitutes a hazard.

Before Operation

CAUTION

• A load current flow in the thick lines shown in the diagrams; therefore, a wire with sufficient current capacity must be used for these lines.

Note

• The external sensor must be selected carefully and its frequency and phase characteristics taken into account.

• The external sensor must be wired so that the area between the wires connected to both ends of the sensor is minimized, in order to reduce the effect of the magnetic field generated by the current to be measured. Measurement is affected by field lines entering this area. Minimizing this area also reduces the effects of external noise.

• Connect the external shunt as in the figures below. To avoid the effects of common-mode voltage, the external shunt must be connected using AWG18 wires (cross sectional area of 1mm2).

• Since measurement accuracy decreases as an effect of an increase of wiring resistance and floating capacity, keep the wiring between the external sensor and this instrument as short as possible.

Voltage input terminal

Current input terminal

Ext. sensor input terminal

Ext. shunt

• If the measuring object is high frequency and high power and is not grounded, use an isolation sensor (CT, DC-CT, clamp)

Clamp sensor

Voltage input terminal

Current input terminal

Ext. sensor input terminal

LOAD

IM 253401-01E

3-9

3.6 Wiring the Measurement Circuit when Using the External Sensor

In cases where the maximum current of the object under measurement exceeds 20A, measurement becomes possible by connecting an external sensor. The range for external sensor input is either 2.5/5/10V or 50/100/200mV. Either range is available as an option. In the following wiring diagrams, the external shunt is grounded. When using the clamp sensor, replace the shunt with the clamp sensor.

Note

• When using the external sensor or the clamp sensor, take care not to reverse the polarity when applying the clamp to the measurement circuit.

• Using the scaling function enables direct reading of measured values on the display. Refer to section 4.5 on page 4-8.

Wiring diagram for single-phase, two-wire system with external shunt connected (253401, 253502, 253503)

SOURCE

Connection side

Ext. shunt

± A

OUT L OUT H

Input terminal

(ELEMENT)

Ext. sensor input terminal (EXT)

LOAD

Wiring diagram for single-phase, three-wire system with external shunt connected (253502, 253503)

SOURCE LOAD

OUT H

±A

OUT L

Input terminal

(ELEMENT1)

Ext. sensor input terminal (EXT)

±A

OUT LOUT H

Input terminal

(ELEMENT3)

Ext. sensor input terminal (EXT)

3-10

IM 253401-01E

3.6 Wiring the Measurement Circuit when Using the External Sensor

Wiring diagram for three-phase, three-wire system with external shunt connected (253502, 253503)

SOURCE LOAD R

OUT H

±A

OUT L

Input terminal

(ELEMENT1)

Ext. sensor input terminal (EXT)

±A

OUT LOUT H

Input terminal

(ELEMENT3)

Ext. sensor input terminal (EXT)

Wiring diagram for three-phase, four-wire system with external shunt connected (253503)

SOURCE LOAD

±A

OUT LOUT H

±A

OUT LOUT H

±A

OUT LOUT H

Before Operation

Input terminal

(ELEMENT1)

Ext. sensor input terminal (EXT)

Input terminal

(ELEMENT2)

Ext. sensor input terminal (EXT)

Input terminal

(ELEMENT3)

Ext. sensor input terminal (EXT)

Wiring diagram for three-voltage, three-current system with external shunt connected (253503)

SOURCE LOAD

±A

OUT LOUT H

Input terminal

(ELEMENT1)

Ext. sensor input terminal (EXT)

±A

OUT LOUT H

Input terminal

(ELEMENT2)

Ext. sensor input terminal (EXT)

±A

OUT LOUT H

Input terminal

(ELEMENT3)

Ext. sensor input terminal (EXT)

IM 253401-01E

3-11

3.7 Connecting the Power Supply

Before Connecting the Power Supply

• Be sure to connect the protective grounding to prevent an electric shock

WARNING

Connecting Procedure

before turning on the power.

• Be sure to use the power supply cord provided by YOKOGAWA. The mains power plug can only be plugged into an outlet with a protective grounding terminal.

• Ensure that the source voltage matches the voltage of the power supply before turning on the power.

• Connect the power cord only after having verified that the power switch is turned OFF.

• Never use an extension cord without protective grounding wire since this will invalidate the protection feature.

1 Make sure that the power switch of the instrument is turned OFF. 2 Connect the accessory power cord to the power connector on the back of the instrument. 3 Insert the power cord to the power outlet which conforms to the following specifications.

Make sure that you use an outlet with a protective grounding terminal only.

Rated supply voltage : 100 to 120VAC / 200 to 240VAC Permitted supply voltage range : 90 to 132VAC / 180 to 264VAC Rated supply voltage frequency : 50/60Hz Permitted supply voltage frequency range : 48 to 63Hz Power consumption : Model Max. power consumption

253401 21VA (at 120VAC),

253502 30VA (at 120VAC),

253503 35VA (at 120VAC),

30VA (at 240VAC)

45VA (at 240VAC)

50VA (at 240VAC)

3 pin consent

WT110 WT130

Power cord (accessory)

3-12

IM 253401-01E

3.8 Turning the Power ON/OFF

Item to be Checked before Turning ON the Power

• Check that the instrument is installed correctly (refer to section 3.2, page 3-2).

• Check that the power cord is connected properly (refer to section 3.7, page 3-12).

Location of the Power Switch

The power switch is located in the lower left corner of the front panel.

Turning the Power ON

Turning the power ON will result in staring the test program, which checks each memory. When the results of these checks are all satisfactory, opening, messages will appear as described on the next page, after which the instrument will be ready for measurement. When the test program results in displaying error codes, proper operation of the instrument cannot be performed. Immediately turn OFF the power and contact you nearest representative. Addresses may be found on the back cover of this manual. When contacting your representative, inform him of the name, suffix and No. code as on the right side panel, and of the displayed error code(s).

Note

• In case of an error code, refer to section 14.4, page 14-11, for a description and corrective action.

•A warm-up time of approx.30 minutes is required before all spesifications of the instrument can be met.

Turning the Power OFF

When turning the power OFF, the previous set-up parameters will be kept. Consequently, turning the power ON again will result in the appearance of the setting condition of the previous measurements.

Before Operation

Note

The instrument uses a lithium battery to back up set-up information. The life of the battery under normal operating temperature of 23˚C is approx. ten years. When the battery life is exhausted, turning ON the power switch will result in an error code and the battery needs to be replaced. Never replace the battery yourself, but inform your nearest representative. Addresses may be found on the back cover of this manual.

IM 253401-01E

3-13

3.8 Turning the Power ON/OFF

Opening Messages

Power switch ON

Display A

Display B Display C

No display

Display differs

depending on specs

and options.

(Model)

(Version)

(Only for/EX1, EX2)

(Only for/HRM option)

(For/DA option)

(For/CMP option)

All LED`s light up

(For WT110)

Extinguish

ABC

(For 253502 )

No display

E-1

(E-2)

(/GPIB mode)

(/GPIB address)

(RS-232-C mode)

(RS-232-C handshake)

(RS-232-C format)

(RS-232-C baud rate)

ABC

All specs/option have

been displayed?

*1 Displays the setting valid before the power was turned OFF.

Any of Addr.A/Addr.b/tonLY/Print can be displayed.

*2 Displays the setting valid before the power was turned OFF.

Any of nor/tonly/Print can be displayed.

3-14

YES

Ready for measurement

IM 253401-01E

3.9 Selecting the Wiring Method (for WT130)

Relevant Keys

Explanation

hour

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING

hour

min sec

AVG FILTER

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Wiring Method

The wiring method is selectable by pressing the WIRING key. The selectable wiring method depends on the model.

WT110 (253401)

This model has no such function. Only one (1) input element has been installed (ELEMENT1). Only single-phase, two-wire measurement is possible.

STORE

min

VVA

123

var

FUNCTION

TIME

VPF

123

deg

FUNCTION ELEMENT

RECALL

VHz

HARMONICS

123

FUNCTION ELEMENT

V RANGE A RANGE HOLD

ELEMENT

MODE

START

HARMONICS MEMORY INTEG SET

LOCAL

INTERFACE OUTPUT

AUTO AUTO

STOP RESET

REMOTE

SETUP

1Φ3W

3Φ3W

3Φ4W

3V3A

TRIG

ENTER

INTEGRATOR

SHIFT

WIRING

Displays relevant keys and indicator

Before Operation

WT130 (253502)

Pressing the WIRING key results in changing the wiring method in the following order. Two (2) elements have been installed (ELEMENT1, ELEMENT3).

1Φ3W

:Single-phase, three-wire system

1Φ3W

3Φ4W

*In case of a measurement circuit of single-phase, two-wire system, and having selected

either element 1 or 3, selecting any of the above mentioned wring methods will result in correct measurement/computation. However, the measurement/computation results in case element Σ has been selected lose the physical meaning.

3V3A

3Φ3W

:Three-phase, three-wire system

WIT130 (253503)

Pressing the WIRING key results in changing the wiring method in the following order. Three (3) elements have been installed (ELEMENT1, ELEMENT2, ELEMENT3).

1Φ3W

:Single-phase, three-wire system

1Φ3W

*In case of a measurement circuit of single-phase, two-wire system, and having selected

either element 1, 2, or 3, selecting any of the above mentioned wring methods will result in correct measurement/computation. However, the measurement/computation results in case element Σ has been selected lose their physical meaning.

3V3A

3Φ3W

:Three-phase, three-wire system

3Φ4W

:Three-phase, four-wire system

3V3A

:Three-voltage, three-current system

Note

Select a wiring method which matches the actual wiring, since the computation method varies according to the wiring method. Consequently, when the wiring method does not match the actual wiring, measurement errors may occur.

IM 253401-01E

3-15

3.10 Improving the Measurement Accuracy

Recommended Wiring Method

The instrument is designed so that voltage input impedance is high and current input impedance is low to reduce the effect of power loss on measurement accuracy. Voltage input impedance : Approx. 2MΩ (all ranges), with a capacitance of appox. 15pF

connected in parallel Current input impedance : Approx. 6mΩ+0.1µH (all ranges) From the explanation given below, it can be understood that the effect of power loss on measurement accuracy can be reduced by wiring according to the load resistance.

SOURCE

Input terminal

(ELEMENT)

In the above diagram, the voltage measurement circuit is connected to the load side. The effects of power loss on measurement accuracy are explained below. For simplification, it is assumed that a DC power source and resistive load are used. The current measurement circuit measures the sum of the current iL that flows to the load (object being measured) and the current iV that flows to the voltage measurement circuit. This means that the current iV is erroneous since the current to be measured is iL. Since the input impedance of the voltage measurement circuit is high (appox. 2MΩ), and even if the input voltage is 600V iV becomes approx. 0.3mA (=600V/2MΩ). If the instrumental error is assumed to be lower than 0.1%, the measured current (iL) will be 300mA or higher (load resistance is 2kΩ or lower). If the input voltage is 10V, iL is 5mA or higher. The relationship between the input voltage and the measured current in cases where instrumental error is within

0.1% and 0.01% is given below as a reference.

Measured voltage(V)

012345

100

200 300

400

500 600

In many cases the recommended wiring method is suitable. For instance, when input voltage and current are 100V and 5A, iV is 0.05mA (=100V/2MΩ), therefore the effect on measurement accuracy is 0.001% (=0.05mA/5A), which is low. On the other hand, measurement accuracy is significantly affected when the measured current is low (i.e. high load resistance). In this case, make the connections as follows so that the current measurement circuit is located on the load side. The voltage measurement circuit measures the sum of the voltage drop eL at the load and eA at the current measurement circuit, therefore eA is erroneous. However, the effect of this error is small since the input impedance of the current measurement circuit is low. For instance, if the load resistance is 600Ω, the input impedance is approx. 6mΩ, therefore the error in measurement is approx. 0.001% (=eA/(eL+eA)), which is low

SOURCE

This instrument

LOAD

SOURCE

Measured current(A)

Effect decreases

0.1% effect 0.01% effect

LOAD

This instrument

LOAD

3-16

IM 253401-01E

4.1 Selecting the Measurement Mode

Relevant Keys

SAMPLE

V OVER

A OVER

MODE

V MEAN

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

RMS V MEAN DC

SHIFT

RMS

hour

V RANGE

MODE

hour

min sec

AVG FILTER

STORE

min

VVA

123

var

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

RECALL

TIME

VPF

deg

VHz

HARMONICS

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

V RANGE

SHIFT

MODE

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

Setting Measurement Conditions

V RANGE

MODE

Explanation

Measurement Mode

One of the following measurement modes can be selected for measurement of voltage and current. The initial value is “RMS”.

Indicator Voltage Current

RMS Measures and displays true Measures and displays true RMS

V MEAN Displays rectified mean value Measures and displays

DC Displays DC value obtained by Displays DC value obtained by averaging the input

RMS value value

calibrated to the RMS value true RMS value

averaging the input signal signal

Theoretical Equations

• RMS

This mode is selected to display input voltage or current as a true RMS value.

f(t)2dt

f (t) : input signal T:one period of the input signal

•V MEAN

This mode is selected to display input voltage or current as a rectified mean value calibrated to the RMS value. Since a sine wave is used for calibration, the value displayed will be the same as that obtained in RMS mode if a sine wave is measured. The value displayed will be different from that obtained in RMS mode if a distorted or DC waveform is measured.

•

f (t) : input signal T:one period of the input signal

2 T

(t) dt

IM 253401-01E

•DC

This mode is selected when the input voltage or current is DC. The input signal is averaged and the result is displayed.

4-1

4.1 Selecting the Measurement Mode

Typical Waveform Types and Differences in Measured Values between Measurement Modes

Name

Waveform

Measurement

mode

Display

RMS

value

RMS

Mean value

—

Mean-value

rectification

V MEAN

Linear

averaging

Sinewave

Half-wave

rectification

Full-wave

rectification

Direct

current

Triangular

wave

Square

wave

Pulse

2π

· Ep

2π

D · Ep

· Ep

2π

When duty D (= ) is applied.

D · Ep

2 2

4 2

2 2

4π 2

2π

2 2

· Ep

π τ

· Ep

πD

· Ep

2π

D · Ep

4-2

IM 253401-01E

4.2 Turning the Filter ON/OFF

Relevant Keys

SAMPLE

V OVER

A OVER

MODE

V MEAN

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

RMS

hour

AVG FILTER

hour

min sec

STORE

min

VVA

var

TIME

VPF

deg

VHz

RECALL

HARMONICS

123

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

Setting Measurement Conditions

Explanation

SETUP

Selecting the filter

(Display C)

ENTER

(Display C)

ENTER

End

Filter Function

The instrument will perform measurements after synchronizing to the cycle of the input signal. Consequently, the frequency of the input signal can be measured properly. The filter, at a cutoff frequency of 300Hz, will only be applied to the frequency measurement circuit and will remove noise from distorted and inverted waves, etc.. This allows the frequency to be measured correctly which improves the accuracy of each measurement value. The filter will not be applied to the voltage and current circuit. The initial value is OFF.

Note

The filter setting cannot be changed while integration is being carried out.

IM 253401-01E

4-3

4.3 Selecting the Measurement Range in case of Direct Input

Relevant Keys

MODE

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

• Voltage Range Setting

V RANGE

SAMPLE

V OVER

A OVER

RMS

V MEAN

hour

AVG FILTER

hour

min sec

min

STORE

(Display C)

RECALL

ENTER

VVA

var

TIME

VPF

deg

VHz

HARMONICS

End

123

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

Explanation

• Current Range Setting

A RANGE

(Display C)

ENTER

End

Manual Range (fixed) versus Automatic Range (auto)

The measurement range can be of one of the following types. The initial setting is Auto range ON.

• Manual range

Voltage range : selectable from 600/300/150/60/30/15V Current range : selectable from 20/10/5/2/1/0.5A

• Auto range: Auto

The measuring range is adjusted automatically according to the input voltage or current as follows. Overrange is handled the same way as for the manually selected range.

4-4

IM 253401-01E

4.3 Selecting the Measurement Range in case of Direct Input

Range up:

A higher range is selected immediately if the instantaneous input voltage or current exceeds approx. 300% of the rated value during sampling. If the meaured voltage or current exceeds 110% of the rated value, a higher range will be selected at the end of the current measurement cycle.

Range down:

A lower range is selected if the measured voltage or current drops below 30% of the rated value. However, even when the measured voltage or current drops below 30% of the rated value, range down will not be done when this would result in waveforms with a high crest factor causing peak over.

Verifying the Range

To verify the current range setting press the V RANGE key or the A RANGE key. The result will be shown at display C. In order to return to the measurement status, press the same key again.

Note

• When the range is set to auto, you cannot move to the minimum range by pressing the ∧ key. On the other hand, when the range is set to the minimum, you cannot move to auto range by pressing the ∨ key.

• When the range is set to auto, the range may be adjusted frequently if a waveform such as a pulse is input. In such a case, set the range manually.

Power Range

The measuring range for active power, apparent power and reactive power is determined as follows.

Wiring method Power range

single-phase, two-wire (1Φ2W) voltage range × current range single-phase, three-wire (1Φ3W) voltage range × current range × 2

three-phase, three-wire (3Φ3W) three-voltage, three-current (3A3V)

three-phase, four-wire (3Φ4W) voltage range × current range × 3

The maximum display is 9999. When the result of “voltage range × current range” exceeds 1000W, the unit on the display will change to “kW”; When this result exceeds 1000kW, the unit on the display will change to MW.

Setting Measurement Conditions

IM 253401-01E

Note

When the range is set to auto, the measuring range switches according to range up/range down conditions. Therefore, the range may vary even if the measured values remain the same.

4-5

4.4 Setting the Scaling Value when External PT/CT is Used

Relevant Keys

MODE

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

• Setting the Scaling Value

SETUP

SAMPLE

V OVER

A OVER

RMS

V MEAN

hour

(Display C)

hour

min sec

AVG FILTER

ENTER

STORE

min

VVA

123

var

FUNCTION

TIME

VPF

123

deg

FUNCTION ELEMENT

RECALL

VHz

HARMONICS

123

FUNCTION ELEMENT

AUTO AUTO

V RANGE A RANGE HOLD

ELEMENT

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

(Display C)

ENTER

Selecting the

input element

(Display C)

6.,16.

ENTER

17.

ENTER

End

• Selecting Scaling ON/OFF

SETUP

(Display C)

PT ratio selecting

(Display A)

up down

SHIFT

10.

SHIFT

•

ENTER

11.

ENTER

cursor shift

decimal point shift

(Display C)

CT ratio selecting

(Display B)

12.

Same as step

8 to 10

ENTER

End

15.

ENTER

Power value

(Display C)

14.

Same as step 8 to 10

4-6

IM 253401-01E

Explanation

4.4 Setting the Scaling Value when External PT/CT is Used

About the Scaling Function

This function is useful for measuring voltage, current, power and such when you are using an external potential transformer (PT), current transformer (CT) or such, and have connected their secondary side outputs to the input elements. You set the scaling value to the PT ratio, CT ratio or power factor. When the scaling function is turned ON, measured values which have been converted to the corresponding values for the transformer primary sides, can been displayed or otherwise output.

Measured/computed value Scaled result

Voltage V P × V P: Voltage scaling value Current A C × A C: Current scaling value Active power W F × P × C × W F: Power scaling value Reactive power var F × P × C × var Apparent power VA F × P × C × VA

Selecting the Input Element

This setting is to select to which element scaling will be applied. The initial value is “ALL”. At the WT110, this selection menu will not appear.

• ALL : Select this when the same scaling values should be applied to all elements together.

• EL1 : Select this when the scaling values should only be applied to element 1.

• EL2 : Select this when the scaling values should only be applied to element 2. This selection will not appear on model 253502.

• EL3 : Select this when the scaling values should only be applied to element 3.

• End : Select this when you finished the setting, or when you want to abort the setting.

Setting Measurement Conditions

Setting the Scaling Value

The scaling values are set in the following order. The setting ranges from 0.001 to 1000. The initial value is 1.000.

•P: Sets the PT ratio on display A

•C: Sets the CT ratio on display B

•F: Sets the power value on display C

In case of the WT110, pressing the ENTER key after setting P, C and F respectively will end this scaling setting. In case of the WT130, selecting End at the input element menu will end this scaling setting.

Turning Scaling ON/OFF

Select the scaling menu once again after having set the scaling values. The initial value is oFF.

•on: When this setting is selected, pressing the ENTER key will start scaling and the SCALING indicator will light.

• oFF : When this setting is selected, pressing the ENTER key will stop scaling and SCALING indicator will extinguish.

Note

When the scaling value x measurement range exceeds 9999M, the computation over display will appear (refer to page 2-3).

IM 253401-01E

4-7

4.5 Selecting the Measurement Range and Setting the Scaling Value when External Sensor is Used (option)

Relevant Keys

MODE

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

• Setting the Scaling Value of the External Sensor Input

Select the external sensor function

SETUP

(Display C)

SAMPLE

V OVER

A OVER

RMS

V MEAN

hour

AVG FILTER

hour

min sec

STORE

min

VVA

123

var

FUNCTION

TIME

VPF

123

deg

FUNCTION ELEMENT

RECALL

VHz

HARMONICS

123

FUNCTION ELEMENT

AUTO AUTO

V RANGE A RANGE HOLD

ELEMENT

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

ENTER

(Display C)

ENTER

Select the setting function

ENTER

Set element 3

13.

(Display C)

ENTER

End

12.

Same as

step 6 to 8

• Selecting the Measurement Range (Current, with Scaling function ON)

In case of/EX2 option

(Display C)

A RANGE

In case of/EX1 option

(Display C)

Select all

(Display C)

up down

SHIFT

•

Set element 1

(Display A)

Same as step 6 to 8

mentioned above.

11.

ENTER

End

cursor shift

decimal point shift

ENTER

Set element 2

(Display B)

10.

Same as

step 6 to 8

4-8

ENTER

End End

ENTER

IM 253401-01E

4.5 Selecting the Measurement Range and Setting the Scaling Value when External Sensor is Used (option)

Explanation

Scaling Function in combination with External Sensor Input

This function is useful for measuring current, power and such when you are using an external sensor, and have connected their output to the input elements. You set the scaling value to the current or power value, computed from the sensor. When the scaling function is turned ON, measured values which have been converted to the corresponding values for the transformer primary sides, can been displayed or otherwise output. This function is exactly the same as the one described previously for use with PT/CT.

Measured/computed value Scaled result

Current A E × A E: External sensor scaling value Active power W E × W Reactive power var E × var Apparent power VA E × VA

Selecting the Setting Format of the Scaling Value

The following two setting formats are available. The initial value is “ALL”. At the WT110, this selection menu will not appear.

• ALL : Select this when the same scaling values should be applied to all elements together.

• EACH: Select this when the scaling values should only be applied to each element seperately.

Setting the Scaling Value

The procedure to set the scaling values depends on the setting format (previous setting). The setting ranges from 0.001 to 1000. The initial value is 50.00. In case of the WT110, the scaling value is set at display C.

• When ALL is selected: The scaling value set at display C will be applied to all elements together.

• When EACH is selected:

• The scaling value set at display A will be applied to element 1 only.

• The scaling value set at display B will be applied to element 2 only. This selection will not

appear on model 253502.

• The scaling value set at display C will be applied to element 3 only.

After having selected ALL or EACH and entered the scaling values, press the ENTER key to end this scaling setting.

Setting Measurement Conditions

Selecting the Measurement Range (Current, with Scaling function ON)

After having set the scaling values, select the menu for the current measurement range. Select the rated output of the external sensor from this menu (refer to the Operating Procedure on the previous page). Scaling of the external sensor input will start as soon as you press the ENTER key after selecting. Scaling will stop as soon as you select a measurement range other than external sensor input from the menu.

Setting Example of Scaling Values for External Sensor Input

•

In case the rated specs of the external sensor are 50A/50mV, measurement range is 50mV, then

50A/50mV × 50mV = 50A: scaling value is 50.00

•

In case the rated specs of the external sensor are 100A/50mV, measurement range is 50mV, then

100A/50mV × 50mV = 100A: scaling value is 100.00

•

In case the rated specs of the external sensor are 50A/80mV, measurement range is 50mV, then

50A/80mV × 50mV = 31.25A: scaling value is 31.25 However, since the setting range is 50mV, use a setting within the 0 to 50mV range.

Note

• When performing measurements using the external sensor, make sure to turn off the scaling function for

the external PT/CT. When this function is ON, the scaling value of the CT ratio will interfere.

• The input range for the external sensor can only be of the manual type.

• When you switch from external sensor input to direct, auto range input, an error will appear. First, select

manual range for direct input and afterwards select auto range. (same goes for setting by communication interface.)

IM 253401-01E

4-9

4.6 Using the Averaging Function

Relevant Keys

MODE

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

SAMPLE

V OVER

A OVER

RMS

V MEAN

hour

AVG FILTER

hour

min sec

STORE

min

VVA

123

var

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

RECALL

TIME

VPF

deg

VHz

HARMONICS

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

• Setting Averaging

Selecting the averaging function

SETUP

Selecting the sample number

(Display C)

• Averaging ON/OFF

Selecting the averaging function

SETUP

(Display C)

ENTER

End

ENTER

(Display C)

ENTER

End

Selecting the type

(Display B)

ENTER

4-10

IM 253401-01E

Explanation

4.6 Using the Averaging Function

About the Averaging Function

This function performs exponential averaging or moving averaging on measurement values. When the displayed values are unsteady due to big fluctuations in power source or load, or due to the low frequency of the input signal, this function is useful to stabilize the displayed values for easier reading.

Selecting the Type of Averaging

The following two selections are available. The initial value is “Lin”.

• Exponential Averaging : EP

Exponential averaging is expressed by the following equation. Dn = Dn-1 + (Mn-Dn-1)/K where

n : the value at the “n”th display;

Dn-1 : the exponentially averaged value at the “n-1”th display; M

n : the measurement value at the “n”th display;

K: attenuation constant

• Moving Averaging: Lin

Moving averaging is expressed by the following equation. Dn = (Mn-(m-1) + Mn-(m-2) + ... Mn-2 + Mn-1 + Mn)/m where

n : the value at the “n”th display;

Mn-(m-1) : the measurement value at (m-1) display before the “n”th display; M

n-(m-2) : the measurement value at (m-2) display before the “n”th display;

: Mn-2 : the measurement value at two displays before the “n”th display; M

n-1 : the measurement value at one display before the “n”th display;

Mn : the measurement value at the “n”th display; m: sample number

Setting Measurement Conditions

Setting the Averaging Sample Number/Attenuation Constant

The following selections are available. The attenuation constant (for exponential averaging) and the sample number (for moving averaging) are set and saved seperately. The initial value is “8”.

Setting Averaging ON/OFF

Select the averaging menu once again after having set the averaging values. The initial value is oFF.

•on: When this setting is selected, pressing the ENTER key will start averaging and the AVG indicator will light.

• oFF : When this setting is selected, pressing the ENTER key will stop averaging and the AVG indicator will extinguish.

IM 253401-01E

4-11

4.7 Using the Four Arithmetical Operation Function (Applies to WT110/WT130 with ROM Version

2.01 or later)

Relevant Keys

MODE

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

SETUP

SAMPLE

V OVER

A OVER

RMS

V MEAN

hour

min sec

AVG FILTER

Selecting the four arithmetical

operations function

min

STORE

(Display C)

RECALL

VVA

var

TIME

VPF

deg

VHz

HARMONICS

123

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

(Display C)

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEM ORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

(for WT130 only)

Displays relevant keys and indicator

Explanation

ENTER

End

ENTER

Four Arithmetical Operations Function

Displays the following computation results on display C. “ ” is displayed at the front when the computation results are being displayed.

：A+B

−

：A ：A

：A

A, B indicates display A, B respectively.

Note

• The meanings of the displayed symbols are as follows:

：+(Addition)

：

−

(Subtraction)

：

(Multiplication)

：

(Division)



• If the display A function is displaying INTEG TIME (elapsed time of integration), the computation result

• If the value of display B function is less than 0.0001% of the rating, the computation result displays “- -

：^(Exponent)

displays “- - - - -” (no data).

oF - -”.

4-12

IM 253401-01E

4.7 Using the Four Arithmetical Operation Function (Applies to WT110/WT130 with ROM Version 2.01 or later)

Application Example

• Power summation

: Displays the result of display A + display B.

Computation example :

Display A Display B Display C Wiring method

W1 W2 or W3 W1+W2 Any

or W1+W3

Converter

W2またはW3

• Power loss

: Displays the result of display A – display B.

Computation example 1 :

Display A Display B Display C Wiring method

W1 W3 W1–W3 Any

Setting Measurement Conditions

Converter

W3W1

Computation example 2 :

Display A Display B Display C Wiring method

∑W(=W1+W3) W2 ∑W–W2 3Φ3W

Converter

Computation example 3 :

Display A Display B Display C Wiring method

W2 ∑W(=W1+W3) W2–∑W3Φ3W

Converter

IM 253401-01E

4-13

4.7 Using the Four Arithmetical Operation Function (Applies to WT110/WT130 with ROM Version 2.01 or later)

• Useful when setting a function other than VA (apparent power) for display A and displaying VA on display C.

: Displays the result of display A × display B.

Computation example :

Display A Display B Display C Wiring method

V1rms A1rms V1rms×A1rms Any

• Absolute value of the impedance

: Displays the result of display A ÷ display B.

Computation example :

Display A Display B Display C Wiring method

V1rms A1rms |Z|=

V1rms A1rms

Any

SOURCE

LOAD

• Voltage ratio across the wires and phase current ratio for a three-phase wiring.

: Displays the result of display A ÷ display B.

Computation example :

Display A Display B Display C Wiring method

V1rms A3rms

A1rms A3rms

3Φ3W

LOAD

V1rms A3rms

A1rms A3rms

SOURCE

• Impedance, resistance and reactance

: Displays the result of display A ÷ (display B)

Computation example :

Display A Display B Display C Wiring method

VA1 A1rms |Z|=

W1 A1rms R=

Var1 A1rms |X|=

VA1 (A1rms)

W1 (A1rms)

Var1 (A1rms)

Any

4-14

SOURCE

LOAD

• Resistance

: Displays the result of (display A)2 ÷ display B

Computation example :

Display A Display B Display C Wiring method

V1rms W1 R=

SOURCE

(V1rms) W1

LOAD

Any

IM 253401-01E

4.8 Computing the Crest Factor (Applies to WT110/ WT130 with ROM Version 2.01 or later)

Relevant Keys

SAMPLE

V OVER

A OVER

MODE

V MEAN

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

SETUP

hour

RMS

hour

min sec

AVG FILTER

Selecting the four arithmetical

operations function

(Display C)

STORE

min

VVA

123

var

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

RECALL

TIME

VPF

deg

VHz

HARMONICS

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

(Display C)

(for WT130 only)

ENTER

End

Setting Measurement Conditions

Explanation

ENTER

Crest factor computation

The crest factor is determined by peak value/rms value. The crest factors for voltage and current are computed and displayed. “

” is displayed at the front when the crest factor is being

displayed.

Computing equation for the crest factor and display

CF V1 : Displays the result of (Peak of V1)/(rms of V1) CF V2 : Displays the result of (Peak of V2)/(rms of V2) (for 253503 only) CF V3 : Displays the result of (Peak of V3)/(rms of V3) (for 253502 and 253503) CF A1 : Displays the result of (Peak of A1)/(rms of A1) CF A2 : Displays the result of (Peak of A2)/(rms of A2) (for 253503 only) CF A3 : Displays the result of (Peak of A3)/(rms of A3) (for 253502 and 253503)

IM 253401-01E

Note

• Definition of crest factor :

• If the measurement mode is V MEAN or DC, “- - - - -” is displayed.

PEAK value RMS value

4-15

4.9 Computing the Efficiency (Applies to WT130 with ROM Version 2.01 or later)

Relevant Keys

MODE

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

SETUP

hour

SAMPLE

V OVER

A OVER

RMS

V MEAN

hour

min sec

AVG FILTER

Selecting the four arithmetical

operations function

min

STORE

(Display C)

RECALL

VVA

var

TIME

VPF

deg

VHz

HARMONICS

123

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

(Display C)

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEM ORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

ENTER

End

Displays relevant keys and indicator

Explanation

ENTER

Setting the Wiring Method

The computing equation for efficiency changes according to the wiring method as indicated on the next page. For the operating procedure, see section 3.9 "Selecting the Wiring Method (for WT130)."

4-16

IM 253401-01E

4.9 Computing the Efficiency (Applies to WT130 with ROM Version 2.01 or later)

Wiring Method and Computing Equation

•When the input and output are both two-wire

Select 1Φ2W, 1Φ3W, or 3Φ3W for the wiring method for the three-phase three-wire system

253502) and 1Φ2W for the wiring method for the three-phase four-wire system (253503).

Primary side

Secondary side

Converter

Output side

Computing equation Efficiency(µ) = (W3/W1)×100

•When the input is two-wire and the output is three-wire

Select 1Φ2W, 1Φ3W, 3Φ3W, or 3V3A for the wiring method. This only applies to model

253503.

Primary side

Converter

Computing equation Efficiency(µ) = {(W1+W3)/W2}×100

Secondary side

Output side

Setting Measurement Conditions

IM 253401-01E

4-17

5.1 Measuring/Displaying Voltage, Current and

VA var

TIME

PF deg

V Hz A Hz Wh

AhAh±

Wh±

Ah±

Active Power

Relevant Keys

SAMPLE

V OVER

A OVER

MODE

V MEAN

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

1 Selecting the Display Function

Select either V (voltage), A (current) or W (power) by pressing the FUNCTION key.

Display

VAW

RMS

hour

FUNCTION

hour

min sec

AVG FILTER

FUNCTION FUNCTION FUNCTION FUNCTION

STORE

min

VVA

123

var

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

RECALL

TIME

VPF

deg

VHz

HARMONICS

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

FUNCTION

Four Arithmetic Operation Value, Crest Factor and Peak Value

Measuring / Displaying Voltage, Current, Active Power, Frequency,

IM 253401-01E

FUNCTION FUNCTION FUNCTION

VAW

FUNCTION FUNCTION FUNCTION FUNCTION

FUNCTION

FUNCTIONFUNCTIONFUNCTIONFUNCTION

Wh± and Ah± will light twice. and are displayed on the top of display C. You can reverse the order by first pressing the SHIFT key followed by the FUNCTION key. *1DisplayedonWT110/WT130withROMversion2.01orlater.

2 Selecting the Input Element

Select the input element by pressing the ELEMENT key.

WT110 (253401)

WT130 (253502)

WT130 (253503)

No such function

ELEMENT ELEMENT ELEMENT

13Σ

ELEMENT ELEMENT ELEMENT ELEMENT

123Σ

3 Selecting the Measurement Range

You can select the voltage measurement range by pressing the V RANGE key, and the current measurement range by pressing the A RANGE key. For more details, refer to either of the following.

• 4.3 Selecting the Measurement Range in case of Direct Input, on page 4-4;

• 4.4 Setting the Scaling Value when External PT/CT is Used, on page 4-6;

• 4.5 Selecting the Measurement Range and Setting the Scaling Value when External Sensor is Used (option), on page 4-8.

4 Selecting the Measurement Mode

Select the measurement mode by pressing the V RANGE (MODE) key after having pressed the SHIFT key so that the SHIFT indicator is lit. For more details, refer to section 4.1 on page 4-1.

FUNCTION

5-1

5.1 Measuring/Displaying Voltage, Current and Active Power

Explanation

Continuous Maximum Allowable Input

• Voltage : peak voltage is 1.5kV, or the RMS value is 1.0kV, whichever is less.

• Current : peak current is 100A or the RMS value is 30A, whichever is less. In case of external sensor input, the peak value is 5 times the measurement range or less.

Maximum Reading of the Display and Units

• Maximum reading : for voltage, current and power, each 9999

• Units : V (voltage), A (current), W (power)

• Prefix : m, k, M

Selecting the Display Function

The following selections are available.

• V : voltage will be displayed

• A : current will be displayed

• W : power will be displayed

Selecting the Input Element

The type of input element which can be selected depends on the model number. Make your selection after having verified your model number.

• 1/2/3: Displays the measurement values of element 1/2/3

• ∑ : Displays according to the wiring method, and is as follows.

Wiring method

1Φ3W

3Φ3W

3Φ4W

3V3A

Wiring method 1Φ3W

3Φ3W 3Φ4W 3V3A

ΣV ΣA

V1+V3

V1+V2+V3

ΣPF Σdeg

ΣW ΣVA

cos-1ΣPF

A1+A3

A1+A2+A3

ΣW W1+W3

W1+W3

W1+W2+W3

W1+W3

ΣVA Σvar V1A1+V3A3

V1A1+V3A3

(

V1A1+V2A2+V3A3

( )

V1A1+V2A2+V3A3

)

var1+var3

var1+var2+var3

var1+var3

5-2

IM 253401-01E

5.2 Measuring/Displaying Frequency

AhAh±

Wh±

Ah±

Relevant Keys

SAMPLE

V OVER

A OVER

MODE

V MEAN

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

1 Selecting the Display Function

Select either V Hz (voltage frequency) or A Hz (current frequency) by pressing the FUNCTION key of display C.

Display

2 Selecting the Input Element

Select the input element by pressing the ELEMENT key of display C. The operation is the same as the one described on page 5-1.

hour

RMS

hour

FUNCTION FUNCTION FUNCTION FUNCTION

FUNCTION

min sec

AVG FILTER

STORE

min

VVA

123

var

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

RECALL

TIME

VPF

deg

VHz Ak

SHIFT

HARMONICS

FUNCTION

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

FUNCTION

SHIFT

V Hz A Hz

FUNCTIONFUNCTIONFUNCTIONFUNCTION

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

FUNCTION

SHIFT

FUNCTION

Displays relevant keys and indicator

FUNCTION

Four Arithmetic Operation Value, Crest Factor and Peak Value

Measuring / Displaying Voltage, Current, Active Power, Frequency,

Explanation

Measurement Range

The measurement range lies from 10 to 50kHz. Depending on the internal timing, however, measurements can be done in the range from 4 to 10Hz. At 100Hz/1kHz/10kHz/100kHz, the

measurement range is auto range.

Maximum Reading of the Display and Units

• Maximum reading : 9999

• Units : Hz

• Prefix : k

Selecting the Display Function

The following selections are available.

• V Hz: voltage frequency will be displayed

• A Hz: current frequency will be displayed

Selecting the Input Element

The type of input element which can be selected depends on the model number. Make your selection after having verified your model number.

• 1/2/3: Displays the measurement values of element 1/2/3

• ∑ : Displays no measurement values, only dots.

Note

• In case the level of the input signal is low (below approx. 7%), or when the frequency is smaller than the measurement range, the display will show “ErrLo”. When the frequency is larger than the measurement range, the display will show “ErrHi”.

• This instrument measures the frequency after synchronizing to the cycle of the input signal. We recommend to turn ON the filter when measuring an inverted waveform or a waveform with high noise.

IM 253401-01E

However, depending on the signal’s frequency and level, “ErrLo” might appear on the display. Since the filter’s cutoff frequency is 300Hz, the signal attenuates and no signal will be detected.

• Even when the filter is set OFF but the frequency exceeds the measurement range, “ErrLo” might appear since no signal will be detected anymore due to the internal circuit’s attenuation.

5-3

5.3 Measuring/Displaying Four Arithmetic

AWV Hz A Hz Wh

AhAh±

Wh±

Ah±

Operation Value, Crest Factor and Peak Value

Relevant Keys

MODE

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

1 Selecting the display Function

Select either (four arithmetical operations, crest factor), (voltage peak value) or (current peak value) by pressing the FUNCTION key.

Display

hour

SAMPLE

V OVER

A OVER

RMS

V MEAN

hour

FUNCTION FUNCTION FUNCTION FUNCTION

FUNCTION

min sec

AVG FILTER

STORE

min

VVA

123

var

FUNCTION

TIME

VPF

123

deg

FUNCTION ELEMENT

RECALL

VHz

HARMONICS

123

FUNCTION ELEMENT

AUTO AUTO

V RANGE A RANGE HOLD

ELEMENT

MODE

START

HARMONICS MEM ORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

FUNCTIONFUNCTIONFUNCTIONFUNCTION

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

FUNCTION

TRIG

SHIFT

FUNCTION

Displays relevant keys and indicator

FUNCTION

 

Explanation

2.Selecting the Input Element

To measure or display the peak value, press the ELEMENT key of display C and select the input element. The procedure is the same as shown on page 5-1.

Measureing/displaying peak value

is displayed at the front of display C for both voltage and current.

• If the function is set to "V," the peak value of the voltage is measured and displayed.

• If the function is set to "I," the peak value of the current is measured and displayed.

Displaying the result of the four arithmetical operation abd the crest factor

When display C is set to , the result of the computing equation specified in Section 4.7 or the crest factor specified in Section 4.8 is displayed. However, if the value of display B function is less than 0.0001% of the rating, “- - oF - -” is displayed for the computation result.

5-4

IM 253401-01E

6.1 Computing / Displaying Apparent Power,

VAW

TIME

VAW

deg

Reactive Power and Power Factor

Relevant Keys

hour

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING

hour

min sec

AVG FILTER

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

STORE

min

VVA

123

var

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

RECALL

TIME

VPF

deg

VHz

HARMONICS

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

Operating Procedure

1 Selecting the Display Function

Select either VA (apparant power), var (reactive power) or PF (power factor) by pressing the FUNCTION key of display A or B.

Display

You can reverse the order by first pressing the SHIFT key followed by the FUNCTION key.

2 Selecting the Input Element

Select the input element by pressing the ELEMENT key of display A or B. The operation is the same as the one described on page 5-1.

Explanation

Maximum Reading of the Display and Units

• Maximum reading of apparent and reactive power: 9999

• Display range of power factor : –1.000 to 1.000 (when the computed result lies between 1.001 and 2.000, 1.000 will be displayed. When the result is 2.001 or more, PFErr will be displayed.)

• Units : VA (apparent power), var (reactive power), power factor (no unit)

• Prefix : m, k, M,

FUNCTION

FUNCTION FUNCTION FUNCTION

FUNCTION FUNCTION FUNCTION FUNCTION

VA var

FUNCTION

Computing / Displaying Apparent Power, Reactive Power, Power Factor and Phase Angle

FUNCTION

Selecting the Display Function

The following selections are available.

• VA : apparent power will be displayed

• var : reactive power will be displayed

• PF : power factor will be displayed

Selecting the Input Element

The type of input element which can be selected depends on the model number. Make your selection after having verified your model number.

• 1/2/3: Displays the measurement values of element 1/2/3

• ∑ : Refer to page 5-2.

Note

• Changing the measurement mode might result in different computed results, even when the input signal

is the same. For more details on the measurement mode, refer to page 4-1.

IM 253401-01E

• When either the voltage or current drops below 0.5% of the measurement range, PFErr will be displayed.

6-1

6.2 Computing/Displaying the Phase Angle

VAWPF

Relevant Keys

MODE

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

1 Selecting the Display Function

Select deg (phase angle) by pressing the FUNCTION key of display B.

Display

hour

SAMPLE

V OVER

A OVER

RMS

V MEAN

hour

min sec

AVG FILTER

You can reverse the order by first pressing the SHIFT key followed by the FUNCTION key.

min

VVA

123

var

FUNCTION

TIME

VPF

deg

VHz

RECALL

STORE

FUNCTION FUNCTION FUNCTION

HARMONICS

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

FUNCTION

TRIG

SHIFT

Displays relevant keys and indicator

FUNCTION

deg

Explanation

2 Selecting the Input Element

Select the input element by pressing the ELEMENT key of display B. The operation is the same as the one described on page 5-1.

Display Range and Units

Display range : G180.0 to d180.0 (G meaning phase lag, d meaning phase lead) Unit : deg

Selecting the Display Function

When you select deg, the phase angle will be displayed.

Selecting the Input Element

The type of input element which can be selected depends on the model number. Make your selection after having verified your model number.

• 1/2/3: Displays the measurement values of element 1/2/3

• ∑ : Refer to page 5-2.

Note

• Changing the measurement mode might result in different computed results, even when the input signal is the same. For more details on the measurement mode, refer to page 4-1.

• When either the voltage or current drops below 0.5% of the measurement range, dEGErr will be displayed.

• Distinction between phase lag and lead can be made properly, only when both voltage and current are sine waves, and when the percentage of voltage or current input relating to the measurement range does not fluctuate much.

• If the computed result of the power factor exceeds 1, the display will be as follows.

- when the power factor ranges between 1.001 to 2.000; the phase angle displays 0.0;

- when the power factor is 2.001 or more, the phase angle displays dEGErr.

6-2

IM 253401-01E

7.1 Integrator Functions

Max. integrated value (999999 MWh/MAh)

Integrated value

Integration time

Start Stop Reset Start

Hold

Reset

Hold

Display overflow

Active power integration and current integration can be carried out. All measurement values (and computed values) can be displayed, even when integration is in progress, except for the integrated values (watt hour or ampere hour) and integration elapsed time. Since integrated values of negative polarity can be also displayed, the consumed watt hour (ampere hour) value of the positive side and the watt hour value returning to the power supply of the negative side (ampere hour: only when the measurement mode is DC), can be displayed seperately.

Integration Modes

The following three modes are available as integration modes.

Manual Integration Mode

• Integration starts: after having pressed the START key

• Integration stops:

• after having pressed the STOP key;

• when the integrated value reaches the maximum of 999999MWh/MAh, or when the integrated value of negative polarity reaches –99999MWh/MAh;

• when the integration elapsed time reaches the maximum of 999 hours and 59 minutes.

• Integration holds: the integration elapsed time and integrated values at the point where integration stopped will be held until the RESET key is pressed.

Integration

IM 253401-01E

Standard Integration Mode

• Integration starts: after having pressed the START key

• Integration stops:

• when the preset time for integration is reached;

• when the integrated value reaches the maximum of 999999MWh/MAh, or when the

integrated value of negative polarity reaches –99999MWh/MAh.

• Integration holds: the integration elapsed time and integrated values at the point where integration stopped will be held until the RESET key is pressed.

Integrated value

Integration time

Start Reset

Integration timer preset time

Hold

7-1

7.1 Integrator Functions

Continous Integration Mode (Repeat Integration)

• Integration starts:

• after having pressed the START key;

• when the preset time for integration is reached, the integrated value and integration elapsed time are reset automatically and restarted immediately.

• Integration stops:

• when the preset time for integration is reached; however, the integrated value and integration elapsed time are reset automatically and restarted immediately;

• after having pressed the STOP key;

• when the integrated value reaches the maximum of 999999MWh/MAh, or when the integrated value of negative polarity reaches –99999MWh/MAh;

• Integration holds: the integration elapsed time and integrated values at the point where they reached the maximum or at the point where the STOP key was pressed will be held until the RESET key is pressed.

Integrated value

Integration time

Hold

Integration Methods

Each display update interval (250ms) the apparent power values or current values are added to the integrated values, and will be time converted. The integration equations are as follows.

Power integration

Current integration

Start

T= 0

Integration timer preset time

4×3600

Integration timer preset time

Stop

Wi : Active power between display update interval t: Preset integration time

4×3600

T= 0

Ai : Current value between display update interval t: Preset integration time

Reset

7-2

IM 253401-01E

Display Resolution during Integration

The display resolution for integrated values is 100000 counts. The decimal point shifts automatically since the integrated value increases in accordance with the elapsed time. The decimal point shifting timing is determined automatically according to the selected voltage and current measuring ranges. After the rated value is set for both voltage and current measuring ranges, the decimal point shifts when the integrated value exceeds 100000 counts. However, the minimum measurement unit is 1/1000 times the power range which is determined by the rated voltage and current ranges, and the maximum measurement unit is MWh (or MAh). The following shows the watt hour values when rated values are input at a 150V/5A range. The below mentioned "h", "m" and "s" stand for hour, minutes and seconds respectively.

Elapsed time Integrated value

0s 0.000mWh 2s 416.67mWh : 4s 833.33mWh 5s 1.0417Wh : 47 9.7917Wh 48 10.000Wh : 7m59s 99.792Wh 8m00s 100.00Wh : 1h00m00s 750.00Wh 2h00m00s 1.5000kWh : 13h00m00s 9.7500kWh 14h00m00s 10.500kWh

7.1 Integrator Functions

Integration

Display Function of Integrator Values

By selecting the display function, you can display the polarity of the integrator values.

Display function Measurement mode Display contents

Wh RMS,VMEAN,DC both positive and negative watt hour values

Wh±

Wh± Ah RMS,VMEAN total ampere hour values

Ah±

*1 When the Wh function is selected, pressing the FUNCTION key once or twice will result in Wh±.

Pressing the FUNCTION key once will result in displaying the positive watt hour value, whereas pressing the FUNCTION key twice will result in displaying the negative watt hour value. In case of the negative watt hour value, "–" will appear in front of the value.

*2 When the Ah function is selected, pressing the FUNCTION key once or twice will result in Ah±.

Pressing the FUNCTION key once will result in displaying the positive ampere hour value, whereas pressing the FUNCTION key twice will result in displaying the negative ampere hour value. In case of the negative ampere hour value, "–" will appear in front of the value.

Note

• When negative integrated values are displayed, the maximum display reading will become –99999MWh/ MAh because of the added minus character.

• When the measurement mode is RMS/VMEAN and the current input drops below 0.5% of the rated range, the ampere hour value will become zero (0).

• During integration is in progress (until being reset), operation of other functions are restricted. Refer to page 7-8 for more details.

RMS,VMEAN,DC positive watt hour value RMS,VMEAN,DC negative watt hour value

DC both positive and negative ampere hour values RMS,VMEAN total ampere hour values (same as Ah) DC positive ampere hour value RMS,VMEAN –0 DC negative ampere hour value

IM 253401-01E

7-3

7.2 Setting Integration Mode and Integration Timer

Relevant Keys

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

hour

AVG FILTER

hour

min sec

STORE

min

VVA

123

var

FUNCTION

TIME

VPF

123

deg

FUNCTION ELEMENT

RECALL

VHz

HARMONICS

123

FUNCTION ELEMENT

V RANGE A RANGE HOLD

ELEMENT

MODE

START

HARMONICS MEMORY INTEG SET

LOCAL

INTERFACE OUTPUT

AUTO AUTO

STOP RESET

REMOTE

SETUP

1φ3W

3φ3W

3φ4W

3V3A

TRIG

ENTER

INTEGRATOR

SHIFT

WIRING

Displays relevant keys and indicator

Explanation

• Selecting the Integration Mode

SHIFT

RESET

INTEG SET

(Display C)

2. 4.

• Setting the Integration Timer

SHIFT

RESET

INTEG SET

(Display C)

ENTER

Selecting the mode

(Display C)

Setting the timer

(Display A)

hour min

Up/down

ENTER

End

ENTER

End

Cursor shift

SHIFT

Selecting the Measurement Mode

The following selections are available. The initial value is nor.

• nor :Select this for manual or standard integration mode. Depending on the integration timer,

this instrument will automatically decide the appropriate mode.

• Cont :Select this for the continuous integration mode.

Setting the Integration Timer

This setting decides how long integration will be performed in terms of hours and minutes. The setting ranges from 000.00 (0 hrs, 0 min) to 999.59 (999 hrs, 59 min). The initial value is

000.00.

• 000.00 :When "nor" is selected on the integration menu, the manual integration mode will

become valid. When "Cont" is selected, an error code will appear and integration will not be performed.

• 000.01 to 999.59 :The time during which integration will be performed when in the standard

or continuous integration mode. The standard or continuous mode should be selected at the integration mode menu.

7-4

IM 253401-01E

7.3 Displaying Integrated Values

VAWVAvar

AWV Hz A Hz

Relevant Keys

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

1 Selecting the Display Function

Pressing the FUNCTION key on display A will select TIME (integration elapsed time). Pressing the FUNCTION key on display C will select either Wh/Wh± (power) or Ah/Ah± (current).

Display

hour

AVG FILTER

FUNCTION

hour

min sec

min

VVA

123

var

FUNCTION

TIME

VPF

deg

VHz

RECALL

STORE

FUNCTION FUNCTION FUNCTION FUNCTION

HARMONICS

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1φ3W 3φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3φ3W

WIRING

3V3A

TRIG

SHIFT

TIME

Displays relevant keys and indicator

FUNCTION

Integration

FUNCTION FUNCTION FUNCTION FUNCTION

FUNCTION

Ah±

FUNCTIONFUNCTIONFUNCTIONFUNCTION

2 Selecting the Input Element

Select the input element by pressing the ELEMENT key on display C. The operation is the same as the one described on page 5-1.

3 Starting Integration

Press the START key. The START indicator will light, the integrated value will appear on display C and the integration elapsed time will appear on display A.

START

4 Holding Integration

Press the HOLD key. The HOLD indicator will light, and the displayed values will be held.

HOLD

5 Cancelling HOLD, and Updating the Integration

Continuing from step 4, press the HOLD key once more, or press the SHIFT key followed by the HOLD (TRIG) key. The HOLD indicator will extinguish and the displayed value will be updated.

FUNCTION

AhAh±

Wh±

HOLD

TRIG

6 Stopping Integration

Press the STOP key. The START indicator will extinguish and the STOP indicator will light. The displayed values will be held.

STOP

7 Resetting Integration

Press the RESET key. The STOP indicator will extinguish and the values on display A and C will be reset to 000.00.

RESET

IM 253401-01E

7-5

7.3 Displaying Integrated Values

Explanation

Maximum Reading of the Display and Units

Maximum reading

• Integrated value :999999 (–99999 in case of minus display)

• Integration elapsed time :999.59

• Units : Wh (power integration : watt hour value), Ah(current integration : ampere hour value)

• Prefix : m, k, M

Selecting the Display Function

The following selections are available.

• Wh :displays both the positive and negative watt hour values

•Wh± :displays the positive watt hour value

• Ah :displays the total ampere hour values

•Ah± :displays the total ampere hour values or the positive ampere hour value For more details, refer to page 7-3.

Selecting the Input Element

• 1/2/3 :Displays the measurement values of element 1/2/3

• ∑ :Displays the total integrated values of the elements installed. The method of computation

depends on the wiring method. The computation method changes to Wh or Ah for the active

power W (refer to chapter 15). When the display function TIME is selected on display A, there is no element function available on display A. Pressing the ELEMENT key on display A will result in an error code.

Update Hold Function

Although the held values will not be updated, integration continues. When hold is being cancelled, the integration results (values and time) corresponding to the point of cancellation, will be displayed. For details regarding the relation with the START/STOP key, refer to the following page.

Integration Reset

Resetting will result in returning the integration results to the status before integration started. Pressing the RESET key is useful after integration has been stopped. For details regarding the relation with the START/STOP key, refer to the following page.

Display in case of Integration Over

When the maximum integration value has been reached (999999MWh/MAh or –99999MWh/MAh), integration will stop and that result will be held on the display. When the maximum integration time has been reached (up to 999hrs 59min), integration will stop and that result will be held on the display.

7-6

IM 253401-01E

7.4 Precautions Regarding Use of Integrator Function

Relation between Integration Hold and the START/STOP key

When the HOLD key is pressed, the display and communication output of the integrated results is being held while integration continues. The relation between this hold function and the START/STOP key is as follows.

• Even when starting integration while the hold function is on, the display and communication output will remain unchanged. Only canceling the hold function or activating a trigger (pressing the SHIFT key followed by the HOLD (TRIG) key) will result in displaying or outputting the integrated results of the time of cancellation.

ON HOLD OFF

Displayed value

(Dotted line shows integrated value)

Integration preset time

STOP

START

RESET

• Even when stopping integration while the hold function is on, the displayed integrated value will remain unchanged. However, as soon the hold function is turned off or a trigger is activated, the integrated results of the time when integration was stopped will be displayed or output.

ON HOLD OFF

TRIG

Displayed value (Dotted line shows integrated value)

Integration preset time

START

ON ON ON

STOP

RESET

Relation between Integration Reset and the START/STOP key

The relation between integration reset and the start/stop key is as follows.

Interrupt

Reset

Integration

Auto stop Reset

IM 253401-01E

Integrated value

Integration preset time

Interrupt

Start

START STOP START STOP RESET START RESET

Restart

Preset time for integration

7-7

7.4 Precautions Regarding Use of Integrator Function

Backup During Power Failures

• If there is a power failure while integration is in progress, the integrated value and integration elapsed time will be backed up. When the power is restored, the display will show the integrated results up to the time the power failure occurred.

• To start integration after the power is restored, it is necessary to reset integration first.

Operating Restrictions during Integration

Certain key operations are restricted during integration, and are shown below.

(START Indicator) (STOP Indicator)

Function Wiring method (only WT130) Measurement mode Filter Measurement range Scaling Averaging Display function Input element (only WT130) Hold Trigger Integration mode

Integration timer

Integration start Integration stop Integration reset Harmonic analysis function (option) Store/recall

Integration reset

Not lit Not lit

Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο

Ο Ο Ο

Integration status

Integration in progress

Lit Not lit

× × ×

Ο Ο Ο Ο

Settings cannot be changed, but can be displayed

× × ×

Store possible

Integration interrupted

Not lit Lit

× × ×

Ο Ο Ο Ο

× ×

Store possible

⋅Ο:Settings can be changed ⋅

×:Settings cannot be changed. Attempts will result in an error code.

⋅When integration is started during auto range, the measurement range will change to manual range.

Integration Computation when the Measured Value Exceeds Measurement Limits

When the active power, measurement current, instantaneous voltage or current exceeds the measurement range, the integration computation will be handled as follows.

• When the active power or measurement current exceeds the measurement range by 163.84%, their integrated values become 163.84% of the measurement range.

• When the instantaneous voltage or current exceeds the measurement range by 300%, their integrated values become 300% of the measurement range.

7-8

IM 253401-01E

8.1 Harmonic Analysis Function

This chapter explains the harmonics analysis function which can be applied to normal measurements of voltage, current and power.

Analyzed/Displayed Items

After having set the harmonic analysis function to ON, the harmonic component of voltage, current, or active power, will be analyzed and displayed for one of the input elements (not applicable for the WT110). Depending on the setting of the display function, the display changes as follows.

Display

No display function lit

FUNCTION FUNCTION FUNCTION

FUNCTION

No display function lit Display function V, A, W

Display

Display function

FUNCTION

VA W PF

: Displays the voltage analysis value of the order shown on display A

: Displays the current analysis value of the order shown on display A

: Displays the active power analysis value of the order shown on display A

: Displays the power factor of the fundamental (1st order)

V %

: Displays the voltage harmonic distortion, proceeded by "t" on display B

A %

: Displays the current harmonic distortion, proceeded by "t" on display B

V %

: Displays the relative harmonic content of the voltage of the order shown on display A

A %

: Displays the relative harmonic content of the current of the order shown on display A

W %

: Displays the relative harmonic content of the active power of the order shown on

V deg

A deg

display A

: · In case the 1st order (fundamental) is shown on display A:

· In case the order 2 to 50 is shown on display A:

: · In case the 1st order (fundamental) is shown on display A:

· In case the order 2 to 50 is shown on display A:

: Displays the harmonic order (1 to 50) : Displays all rms values (computed values) of 1up to 50 components of voltage, current or active power

FUNCTION

V% A%

FUNCTION FUNCTIONFUNCTIONFUNCTIONFUNCTION

Adeg

Displays the phase angle between the voltage of the first order and the current of the first order

Displays the phase angle between the voltage of the first order and each voltage of the 2nd to 50th order

Displays the phase angle between the voltage of the first order and the current of the first order (same as V deg)

Displays the phase angle between the current of the first order and each current of the 2nd to 50th order

W%Vdeg A% V%

Using the Harmonic Analysis Function (optional)

Display

Display function : Displays all rms values (computed values) of 1 up to 50 components of voltage,

Auto Range Operation

Display Renewal Rate

IM 253401-01E

FUNCTION

VAWV Hz

V, A, W

current or active power.

: Displays the fundamental frequency of the voltage for PLL synchronization

V Hz

(displays the measurement value for only the selected voltage input)

: Displays the fundamental frequency of the current for PLL synchronization

A Hz

(displays the measurement value for only the selected current input)

FUNCTION

FUNCTION FUNCTION

A Hz

The up/down operation of the measurement range is the same as for normal measurement.

Note

When the range changes, the PLL synchronization will be re-established. Therefore, correct measurement values might not be obtained which might result in an unstable range. If this is the case, set the measurement range to a fixed range.

Harmonic analysis data will be updated approx. every 3 seconds.

8-1

8.1 Harmonic Analysis Function

Holding the Display

When you use the display hold function and change the order or display function while the harmonic analysis function is ON, you can display the harmonic data analyzed at the corresponding time.

Updating the Displayed Data

The display can be updated in the same way as for normal measurement.

Overrange/Error Displays

In case the fundamental frequency of the PLL synchronization signal lies outside the measurement range. Display B will show “FrqEr”.

Note

The measurement range of the fundamental frequency of the harmonic analysis function is different from the frequency measurement range of normal measurement. Refer to Ch. 15 for more details.

Display in case of Overrange

The overrange display (being the same as for normal measurement) will appear when all rms values of the 1st to 50th order reach the following value:

• 140% of the rated range for the 600V voltage range, or 20A current range

• 200% of the rated range for voltage ranges except 600V, or current ranges except 20A The relative harmonic content and harmonic distortion are related to voltage and current.

Error Display

The power factor or phase angle will show PFErr or dEGEr when either the voltage, range or power exceeds 200% of the range.

Computation Over Display

Appears in the same way as for normal measurement.

Dot Display

The display will show dots in any of the following cases.

• When there are no more analysis data to be displayed during harmonic analysis;

• Soon after the harmonic analysis function has been turned ON;

• When the PLL synchronization is being re-established;

• Until the initial analysis data are obtained, after having changed the settings;

• When the analysis order which depends on the fundamental frequency, exceeds the upper

limit, after having set the order at display A;

• When the display function is set to relative harmonic content (%) and the order at display A is

set to 1;

• When the PLL source is set to voltage, and an attempt is made to display the current

frequency (AHz); or when the PLL source is set to current, and an attempt is made to display the voltage frequency (VHz);

• When an element which is not assigned to the measurement object, is selected. However,

since the frequency is not related to the element setting, the fundamental frequency designated as the PLL source can be displayed.

Averaging Function

Exponential averaging is performed with an attenuation constant of 8.

Output to an External Plotter

Using the GP-IB or RS-232-C interface, harmonic analysis data can be printed as value or graph on an external plotter.

Effect of Aliasing

This instrument is not equipped with an internal aliasing filter. Due to aliasing accidental errors may occur under the following circumstances. Fundamental frequency f in Hz 40≤f<70 errors may occur in case of harmonic components of the 256th or higher; 70≤f<130 errors may occur in case of harmonic components of the 128th or higher; 130≤f<250 errors may occur in case of harmonic components of the 64th or higher; 250≤f≤440 errors may occur in case of harmonic components of the 32nd or higher.

8-2

IM 253401-01E

8.2 Setting the Element, PLL Source and Harmonic Distortion Method

Relevant Keys

SAMPLE

V OVER

A OVER

MODE

V MEAN

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

• Setting the Element

RMS

hour

AVG FILTER

hour

min sec

STORE

min

VVA

123

var

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

RECALL

TIME

VPF

deg

VHz

HARMONICS

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ 4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

SHIFT

START

HARMONICS

(Display C)

ENTER

Setting the element

(Display C)

• Setting the PLL source

SHIFT

START

HARMONICS

(Display C)

ENTER

Setting the PLL source

(Display C)

• Setting the Computation Method of the Harmonic Distortion

SHIFT

START

HARMONICS

(Display C)

ENTER

End

ENTER

End

Using the Harmonic Analysis Function (optional)

IM 253401-01E

Setting the computation method

ENTER

(Display C)

ENTER

End

8-3

8.2 Setting the Element, PLL Source and Harmonic Distortion Method

Explanation

Setting the Element

Only one input element should be set for harmonic analysis. The initial value is EL1. At the WT110 the element setting menu does not appear.

• EL1 : Element 1 will be used for analysis;

• EL2 : Element 2 will be used for analysis; In case of the 253502, this menu will not be shown;

• EL3 : Element 3 will be used for analysis.

Setting the PLL source

For harmonic analysis, it is necessary to select the input to be used as the fundamental frequency (PLL source) for synchronization. (PLL stands for Phase Locked Loop.)

• V1: Sets the voltage of element 1 as the PLL source;

• A1: Sets the current of element 1 as the PLL source;

• V2: Sets the voltage of element 2 as the PLL source;

• A2: Sets the current of element 2 as the PLL source;

• V3: Sets the voltage of element 3 as the PLL source;

• A3: Sets the current of element 3 as the PLL source.

Note

• If the fundamental frequency of the PLL source cannot be measured due to fluctuations or distortion, it is not possible to obtain correct measurement results. In this case, it is suggested that voltage with relatively small distortion be selected as the PLL source.

• It is recommended to turn ON the filter in cases where the fundamental frequency is 300Hz or less and high frequency components are present.

• If the amplitude of the input signal selected as the PLL source is smaller than the rated range value, PLL synchronization may sometimes fail. In this case, it is suggested that a suitable measurement range be selected so that the input level exceeds 30% of the rated range value.

Setting the Computation Method of Harmonic Distortion

The computation method of harmonic distortion can be selected from the following two. In the following explanation a maximum of 50 analysis orders is assumed. In case of a maximum less than 50, computation/display will be performed up to that order.

• iEC : Computes the ratio of the rms value of the 2nd to 50th order component to that of the fundamental (1st order).

• CSA : Computes the ratio of the rms value of the 2nd to 50th order component to that of the rms value of the 1st to 50th component.

Computation Equation

In case of iEC

(Ck)

k=2

In case of CSA

(Ck)

k=2

C1 : Fundamental component (1st order) Ck : Fundamental or harmonic component k:Analysis order n:Maximum order. The maximum order depends on the fundamental frequency of the input set

as the PLL source. Refer to Ch. 15 for more details.

k=1

(Ck)

8-4

IM 253401-01E

8.3 Switching the Harmonic Analysis Function ON/

SHIFT

START

HARMONICS

(Display C)

ENTER

End

• Turning the Harmonic Analysis Function ON/OFF

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

OFF

Relevant Keys

SAMPLE

V OVER

A OVER

MODE

V MEAN

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

RMS

hour

AVG FILTER

hour

min sec

STORE

min

VVA

123

var

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

RECALL

TIME

VPF

deg

VHz

HARMONICS

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

Explanation

Using the Harmonic Analysis Function (optional)

Turning the Harmonic Analysis Function ON/OFF

•on: Pressing the ENTER key after selecting on will result in starting of the harmonic analysis and the HARMONICS indicator will light up. The harmonic order will be displayed on display A.

• oFF : Pressing the ENTER key after selecing off will result in stopping of the harmonic analysis and the HARMONICS indicator will extinguish.

Note

• When the harmonic analysis function is turned ON, the measurement mode will automatically change to

RMS mode. When the harmonic analysis function is turned OFF, the measurement mode will stay the RMS mode.

• When the harmonic analysis function is ON, integration cannot be started. And accordingly, when the

integration is in progress, the harmonic analysis function cannot be started (refer to page 7-8).

IM 253401-01E

8-5

8.4 Setting the Harmonic Order and Displaying the

Results of Harmonic Analysis

Relevant Keys

MODE

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

The following operations assume that the harmonic analysis function is turned ON.

Setting the Harmonics Order

1. Light up the display function indicator of display A.

Display

hour

SAMPLE

V OVER

A OVER

RMS

V MEAN

hour

min sec

AVG FILTER

Light up display function

STORE

min

VVA

123

var

FUNCTION

TIME

VPF

123

deg

FUNCTION ELEMENT

RECALL

123

VHz

FUNCTION ELEMENT

HARMONICS

FUNCTION FUNCTION FUNCTION

AUTO AUTO

V RANGE A RANGE HOLD

ELEMENT

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

FUNCTION

Explanation

2. Set the harmonics order.

(Display A)

Displaying the Values of Harmonic Analysis

Displays each analysis value after having set the display function of either display B or C.

Display

FUNCTION

VA W PF

FUNCTION FUNCTIONFUNCTIONFUNCTIONFUNCTION

Adeg

FUNCTION

W%Vdeg A% V%

FUNCTION FUNCTION

VAWV Hz

FUNCTION

V% A%

A Hz

Setting the Order of Harmonics

The maximum order for which analysis results can be displayed varies depending on the frequency of the fundamental. Example

• When the fundamental frequency is 50Hz, up to 50 orders can be displayed;

• When the fundamental frequency is 400Hz, up to 30 orders can be displayed. When an order is set exceeding the maximum order, display B will change to the dot display. Refer to Ch. 15 for more details on upper limits of analysis orders.

FUNCTION

8-6

IM 253401-01E

8.4 Setting the Harmonic Order and Displaying the Results of Harmonic Analysis

Displaying the Results of Harmonic Analysis

Depending on the setting of display function of display B and C, the analyzed items will appear on the display as follows. In the following explanation a maximum of 50 analysis orders is assumed. In case of a maximum less than 50, computation/display will be performed up to that order.

Display B

V:Shows the analysis value of the voltage corresponding to the order shown on display A; A:Shows the analysis value of the current corresponding to the order shown on display A; W:Shows the analysis value of the active power corresponding to the order shown on

display A; PF : Shows the power factor of the fundamental (1st order); V% : Shows the harmonic distortion of the voltage followed by the character “t”; Two

computation methods are available; Refer to page 8-4 for details. The display range is

0.00 to 99.99 and 100.0 to 999.9%.

A% : Shows the harmonic distortion of the current followed by the character “t”; Two

computation methods are available; Refer to page 8-4 for details. The display range is

0.00 to 99.99 and 100.0 to 999.9%.

V% : Shows the relative harmonic content of the voltage corresponding to the order shown

on display A; The display range is 0.00 to 99.99 and 100.0 to 999.9%. A% : Shows the relative harmonic content of the current corresponding to the order shown on

display A; The display range is 0.00 to 99.99 and 100.0 to 999.9%. W% : Shows the relative harmonic content of the active power corresponding to the order

shown on display A; The display range is 0.00 to ±99.99 and ±100.0 to ±999.9%. V deg : In case the fundamental (1st order) is shown on display A

Shows the phase angle between the 1st order of the current and the 1st order of the

voltage. G (phase lag) or d (phase lead) will also be displayed.

In case the 2nd to 50th order is shown on display A

Shows the phase angle between the 1st order of the voltage and the 2nd to 50th order of

each voltage. A – (minus) will be displayed in front of the order only when the 2nd to

50th order is phase-lagged. The display range is –180.0 to 180.0 deg. A deg : In case the fundamental (1st order) is shown on display A

Shows the same as in case of V deg.

In case the 2nd to 50th order is shown on display A

Shows the phase angle between the 1st order of the current and the 2nd to 50th order of

each current. A – (minus) will be displayed in front of the order only when the 2nd to

50th order is phase-lagged. The display range is –180.0 to 180.0 deg.

Using the Harmonic Analysis Function (optional)

IM 253401-01E

Display C

V: Shows each rms (computed) value of the 1st to 50th harmonic component of the

voltage; A: Shows each rms (computed) value of the 1st to 50th harmonic component of the

current; W:Shows each rms (computed) value of the 1st to 50th harmonic component of the active

power;

8-7

8.4 Setting the Harmonic Order and Displaying the Results of Harmonic Analysis

Computation Equation

k=1

Vk, Ak, Wk :Each component of 1st to 50th order of voltage, current and active power; k:Analysis order n:Maximum order. The maximum order depends on the fundamental frequency of the

V Hz :Shows the fundamental frequency of the voltage of the PLL source. This frequency

applies only to the element selected as PLL source. For details regarding the PLL source setting, refer to page 8-3. The measurement range is the same as in case of normal measurement. The range of fundamental frequencies in case of harmonic analysis is 40 to 440Hz. However, depending on internal timing, there are cases where measurements in the 20 to 700Hz range can be performed.

A Hz :Shows the fundamental frequency of the current of the PLL source. The rest is the same

as in case of V Hz.

(Vk)

k=1

(Ak)

k=1 n

input set as the PLL source. Refer to Ch. 15 for more details.

Note

• In case you select an input element using the ELEMENT key which is not the assigned element for the harmonic analysis or you selected a display function which is not being analyzed/measured, then the bar display appears.

• When the harmonic analysis function is turned ON on the WT130, pressing the ELEMENT key will not result in moving to ∑.

• When pressing the FUNCTION key on display A, and the display function becomes V, A or W, then display A will show the same analysis items as the V, A or W shown on display C.

• Characteristics such as maximum reading, display range, units, etc. which are not described on the previous page, are not different from the characteristics of normal measurement.

8-8

IM 253401-01E

9.1 Storing/Recalling Measured Data

Relevant Keys

hour

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING

hour

min sec

AVG FILTER

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

• Setting the Storage Interval for Measurement Data

Selecting the store function

SHIFT

STOP

MEMORY

(Display C)

• Storage of Measurement Data ON/OFF

STOP

MEMORY

SHIFT

min

VVA

var

TIME

VPF

deg

VHz

RECALL

STORE

ENTER

HARMONICS

(Display C)

Selecting the store function

(Display C)

123

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

ENTER

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

TRIG

ENTER

INTEGRATOR

STOP RESET

SETUP

SHIFT

3Φ3W

WIRING

3V3A

(Display C)

Displays relevant keys and indicator

Setting interval

(Display C)

sec

hour mi n

Up/down

Shift cursor

SHIFT

ENTER

End

ENTER

End

Storing / Recalling

IM 253401-01E

• Setting the Recall Interval for Measurement Data

SHIFT

STOP

MEMORY

Selecting the recall function

(Display C)

ENTER

• Recalling Measurement Data ON/OFF

Selecting the recall function

SHIFT

STOP

MEMORY

(Display C)

ENTER

Setting Interval

SHIFT

(Display C)

hour mi n

Up/down

ENTER

sec

Shift cursor

End

ENTER

End

9-1

9.1 Storing/Recalling Measured Data

Explanation

Storing Measured Data (Storing into Internal Memory)

The number of blocks which can be stored into the internal memory is as follows.

Model In case of normal measurement In case of harmonic analysis

253401 600 Blocks 30 Blocks 253402 300 Blocks 30 Blocks 353503 200 Blocks 30 Blocks

Items which can be stored

One block consists of all data which are obtained when the display is updated once. The data number increases by the number of used input elements and therefore the number of blocks that can be stored depends on the model as described above.

• when storing normal measured data (harmonic analysis function is turned OFF) Each measured/integrated data of normal measurement will be stored. However, only either the voltage frequency or current frequency will be stored *1 When either the V Hz or A Hz display function is lit, the frequency of that function will

be stored. When neither is lit, the frequency of the latest lit display function will be stored. Regarding the element, the frequency of the latest set element will be stored.

• when storing harmonic analysis data (harmonic analysis function is turned ON) Normal measured data will not be stored. All analysis data of the elements which are being used for analysis, will be stored.

Aborting Storage

• when all the above described blocks are full;

• when during the storage process “oFF” is selected at the store ON/OFF setting.

Setting the Storage Interval

Sets the time during which storage will be carried out.

• when storing normal measured data (harmonic analysis function is turned OFF)

• Setting range : 00.00.00 (0hrs, 0min, 0sec) to 99.59.59 (99hrs, 59min, 59sec)

• Initial value : 00.00.00

When the setting is 00.00.00, the interval will become 250ms.

• when storing harmonic analysis data (harmonic analysis function is turned ON)

• Setting range : 00.00.00 (0hrs, 0min, 0sec) to 99.59.59 (99hrs, 59min, 59sec)

• Initial value : 00.00.00

When the setting ranges from 00.00.00 to 00.00.03, the interval will become 3s; from

00.00.04 to 00.00.06, the interval will become 6s; from 00.00.07 to 00.00.09, the interval will

become 9s; in other cases, the set interval will be valid.

Storage ON/OFF

After having set the storage interval, select the store menu once again. The initial value is oFF.

•on:Storing will start by pressing the ENTER key after selecting “on”; the STORE indicator will light while storage is in progress.

• oFF : Storing will stop by pressing the ENTER key after selecting “oFF”; the STORE indicator will extinguish.

Note

• After storing has been stopped and storing is restarted, the existing data in the memory will be

overwritten. Previous data will therefore be lost.

• Stored data will be kept even after the power has been turned OFF because of the internal lithium

battery.

• When integrated values are not present, the dot display will be stored as data, whereas 000.00 will be

stored as integration preset time.

• When the fundamental frequency is high and up to 50 windows of harmonic analysis data are not

present, the dot display will be stored as data.

• While storage is in progress, several settings cannot be changed, such as switching the harmonic analysis

function ON/OFF, changing the related input element, the PLL source, the harmonic distortion factor computation method, nor can scaling, averaging and filter settings be changed, nor integration mode, integration time and storage interval.

• If you press the HOLD key while storing data, the measurement operation and the counting operation of

the store interval are suspended. The storage operation itself is also suspended. However, if integration is in progress, measurement and integration continues internally.

9-2

IM 253401-01E

9.1 Storing/Recalling Measured Data

Recalling Measured Data (Retrieving Data from the Internal Memory)

After displaying data stored in the internal memory on the panel, you can use all display functions and carry out integration and display these data. Furthermore, by using the communication function, data can be output.

Items which can be recalled

all data which can be stored.

Aborting Recalling

- when all stored data are retrieved;

- when during the recall process “oFF” is selected at the store ON/OFF setting.

Setting the Recalling Interval

Sets the time during which recalling will be carried out.

• Setting range : 00.00.00 (0hrs, 0min, 0sec) to 99.59.59 (99hrs, 59min, 59sec)

• Initial value : 00.00.00 When recalling normal measured data, the interval will become 250ms when the setting is

00.00.00. When recalling harmonic analysis data, the interval will become 1s when the setting is 00.00.00.

Recalling ON/OFF

After having set the recalling interval, select the recall menu once again. The initial value is oFF.

•on: Recalling will start by pressing the ENTER key after selecting “on”; the RECALL indicator will light while recalling is in progress.

• oFF : Recalling will stop by pressing the ENTER key after selecting “oFF”; the RECALL indicator will extinguish

Note

• During recalling, the measurement conditions/range *1 will become as those of the data being recalled.

After recalling finishes, the original measurement conditions will return. *1 measurement range, measurement mode, filter ON/OFF, scaling ON/OFF, scaling values, averaging

ON/OFF, averaging mode, averaging values, integration mode, integration time, harmonic analysis function ON/OFF, PLL source, input element, computation method of harmonic distortion factor

• When recalling data to a personal computer by communication interface, data might be cut due to the

data length or used personal computer. In such a case, increase the recalling interval.

Storing / Recalling

IM 253401-01E

9-3

9.2 Storing/Recalling Set-up Parameters

Relevant Keys

MODE

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

• Storing Set-up Parameters

SHIFT

SAMPLE

V OVER

A OVER

RMS

V MEAN

hour

min sec

AVG FILTER

Selecting storage of set-up parameters

STOP

MEMORY

min

STORE

(Display C)

RECALL

VVA

var

TIME

VPF

deg

VHz

HARMONICS

123

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

ENTER

AUTO AUTO

V RANGE A RANGE HOLD

MODE

INTEGRATOR

STOP RESET

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

SETUP

INTERFACE OUTPUT

1Φ3W

3Φ4W

3Φ3W

3V3A

Select file for storage

(Display B)

TRIG

ENTER

SHIFT

WIRING

Displays relevant keys and indicator

ENTER

End

• Recalling Set-up Parameters

SHIFT

Selecting recalling of set-up parameters

(Display C)

STOP

MEMORY

ENTER

When set-up parameters are stored to a file, display C will show " " When no data are stored yet, display C will show " "

Select file for recalling

(Display B)

ENTER

End

When set-up parameters are stored to a file, display C will show " " When no data are stored yet, display C will show " "

9-4

IM 253401-01E

Explanation

9.2 Storing/Recalling Set-up Parameters

Storing Set-up Parameters

Stores the current set-up parameters which consist of the following. Four destinations (FiLE1/ FilE2/FiLE3/FiLE4) are available. Measurement range, measurement mode, scaling settings, averaging settings, filter settings, integration settings, harmonic settings, plotter output settings, store/recall settings, and communication settings. When data are saved in a file and you want to save data in the same file, display C will show “SAVEd”. Pressing the ENTER key will result in overwriting the previously saved data. Set-up parameters are saved in another internal memory than measured data. Saved set-up parameters are backed up by the lithium battery in the same way as measured data.

Recalling Set-up Parameters

When set-up parameters are being retrieved, all set-up parameters are being set accordingly. After that, measurements can be carried out.

Storing / Recalling

IM 253401-01E

9-5

10.1 Remote Control and D/A Output Connector (optional)

Using the remote control and the D/A output connector, this instrument can be remotely controlled and D/A output can be done. The connector’s pin sequence and signal assignment is as follows.

Connector’s Pin Sequence

WT110 : 253401 WT130 : 253502, 253503

2413

Pin Assignment

112

(Rear panel)

/DA4 specifications (for WT110: 253401 only)

remote control, 4 channel D/A output

Pin No. Signal Pin No. Signal

1 2 3 4 5 6 7 8

9 10 11 12

DIGITAL COM EXT HOLD EXT START EXT RESET No Connection No Connection No Connection No Connection No Connection DA 3ch DA 1ch DA COM

(Input) (Input) (Input)

(Output) (Output)

13 14 15 16 17 18 19 20 21 22 23 24

DIGITAL COM EXT TRIG EXT STOP INTEG BUSY No Connection No Connection No Connection No Connection No Connection DA 4ch DA 2ch DA COM

(Input) (Input) (Output)

(Output) (Output)

/DA12 specifications (for WT130: 253502, 253503)

remote control, 12 channel D/A output

Pin No. Signal Pin No. Signal

10 11 12

DIGITAL COM EXT HOLD EXT START EXT RESET

No Connection DA 11ch DA 9ch DA 7ch DA 5ch DA 3ch DA 1ch DA COM

(Input) (Input) (Input)

(Output) (Output) (Output) (Output) (Output) (Output)

13 14 15 16 17 18 19 20 21 22 23 24

DIGITAL COM EXT TRIG EXT STOP INTEG BUSY

No Connection DA 12ch DA 10ch DA 8ch DA 6ch DA 4ch DA 2ch DA COM

(Input) (Input) (Output)

(Output) (Output) (Output) (Output) (Output) (Output)

(Rear panel)

Remote control:input circuit

+5V

10kW

100Ω

0.01µF

TTL level

:0 to 0.8V

:2.0 to 5V

Remote control:output circuit

+5V

100Ω

TTL level

LH:0 to 0.4V(8mA)

:2.4 to 5V(–400µA)

Using External In / Output

IM 253401-01E

WARNING

/CMP specifications (for WT110/130: 253401, 253502, 253503)

remote control, 4 channel D/A output, 4 channel comparator output

Pin No. Signal Pin No. Signal

10 11 12

DIGITAL COM EXT HOLD RELAY 3ch NC

RELAY 1ch NC

No Connection DA 3ch DA 1ch DA COM

(Input) (Input)

COM NO

(Output) (Output)

The connectors used in this function have protective covers. When the covers are removed or when using connectors, the voltage ratings across the measuring input and the ground become as follows:

Voltage across A, ±(V and A side) input terminals and ground 400 Vrms max. Voltage across V terminal and ground 600 Vrms max.

Put the protective cover on the connector when this function is not used.

13 14 15 16 17 18 19 20 21 22 23 24

DIGITAL COM EXT TRIG RELAY 4ch NC

RELAY 2ch NC

No Connection DA 4ch DA 2ch DA COM

COM NO

(Output) (Output)

10-1

10.2 Remote Control (optional)

Controlling Integration

To control integration, apply timing signals according to the timing chart below.

StopStart Reset StopStart

5ms min.

EXT START

EXT STOP

EXT RESET

INTEG BUSY

Holding Display Data Update (same function as HOLD key)

To hold the display update, apply the EXT. HOLD signal according to the timing chart below.

Approx. 15ms

As shown in the timing chart, the INTEG BUSY output signal level goes low while integration is in progress. The signal can be used to monitor integration, etc.

Approx. 15ms

5ms min.

Approx. 15ms

CAUTION

Display hold

EXT. HOLD

5ms min.

Updating Display Data which has been held (same function as TRIG key)

Applying an EXT.TRIG signal when the display is on hold updates the display data.

⋅Update timing during normal measurement/integration

Measurement start

250ms min.

EXT. TRIG

⋅Update timing while harmonic analysis function is in progress

Measurement start

EXT. TRIG

• Do not apply a voltage which exceeds the TTL level to the remote controller pin. Also, do not short the output pins nor apply a voltage to them.

• The instrument might be damaged.

Display update

5ms min.

3s min.

5ms min.

Display update

5ms min.

10-2

IM 253401-01E

10.3 D/A Output (optional)

Relevant Keys

SAMPLE

V OVER

A OVER

MODE

V MEAN

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

• Setting D/A Output

SETUP

OUTPUT

SHIFT

hour

RMS

hour

min sec

AVG FILTER

Selecting D/A output function

(Display C)

min

STORE

VVA

var

FUNCTION

TIME

VPF

deg

FUNCTION ELEMENT

VHz

FUNCTION ELEMENT

RECALL

HARMONICS

Selecting output format

ENTER

123

ELEMENT

123

(Display C)

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

ENTER

End

(Selecting default setting)

Displays relevant keys and indicator

6.,12.

Selecting

output channel

(Display B)

ENTER

13.

ENTER

End

Selecting output item

(Display C)

(Select desired item)

11.

ENTER

*1 When you press the key at step 11,

the output channel displayed at display B will change to the next channel, i.e. from ch1 to ch2 and so forth.

*2 The number of channels depends on the

installed options. In case of option /DA4 or /CMP, there are four channels, in case of option /DA12, there are twelve channels available.

*3 Depends on the model number. Refer to the

specifications section for more details.

*4 Displayed on WT110/WT130 with ROM version

2.01 or later.

Sets the A column

SHIFT

10.

Select from 1 to 4

ENTER

Moves to the B column

Using External In / Output

IM 253401-01E

10-3

10.3 D/A Output (optional)

Explanation

• Setting Preset Integration Time

SHIFT

Selecting preset integration time

RESET

INTEG SET

(Display C)

ENTER

Preset time setting

(Display A)

hour min

4. Up/down

5. cursor shift

SHIFT

ENTER

End

D/A Output

Voltage, current, active power, apparent power, reactive power, power factor, phase angle, harmonic analysis data and integrated data values will be output as a 5V FS analog voltage. The number of items which can be output (number of output channels) depends on the installed options.

Default Setting of the Output Format

The default items which will be output can be selected as follows.

• dFLt-n (normal measurement values are set as default)

Select this when you want to output normal measurement values. Which items are output to which channel is described below.

Option

Model

ch1 ch2 ch3 ch4

/DA4

253401

V A W

ch5 Output channel

ch6

ch7

ch8

ch9

ch10

These channels cannot be set.

ch11

ch12

*1*2:When either the function indicator of V Hz or A Hz is lit, the frequency corresponding to

the lit function indicator will be output. When neither indicator is lit, the frequency of the last used function indicator will be output. The frequency of the last assigned element will be output.

:The number corresponds to input element 1, 2, or 3.

/DA12 /CMP

253502 253503 253401 253502 253503

V3 ΣV A1

A3 ΣA W1

W3 ΣW

V1 V2 V3 ΣV

V A W

Hz A1 A2 A3 ΣA W1

These channels cannot be set.

W2 W3 ΣW

*2 *2

V1 A1 W1

V1 A1 W1 Hz

10-4

• dFLt-i (integration measurement values are set as default)

Select this when you want to output integration measurement values. Which items are output to which channel is described below.

Option

Model

ch1 ch2 ch3 ch4

/DA4

253401

W Wh Ah

ch5 Output channel

ch6

ch7

ch8

ch9

ch10

These channels cannot be set.

ch11

ch12

*1*2:When either the function indicator of V Hz or A Hz is lit, the frequency corresponding to

the lit function indicator will be output. When neither indicator is lit, the frequency of the last used function indicator will be output. The frequency of the last assigned element will be output.

:The number corresponds to input element 1, 2, or 3.

/DA12 /CMP

253502 253503 253401 253502 253503

W3 ΣW Wh1

Wh3 ΣWh Ah1

Ah3 ΣAh

W1 W2 W3 ΣW

W Wh Ah

Hz Wh1 Wh2 Wh3 ΣWh Ah1

These channels cannot be set.

Ah2 Ah3 ΣAh

*2 *2

W1 Wh1 Ah1

IM 253401-01E

10.3 D/A Output (optional)

Selecting the Desired Item of the Output Format

The items to be output are set per each output channel.

• Setting the output channel

The number of channels depends on the installed options and can be selected from the following.

• /DA4 : 4 channels

•/DA12: 12 channels

• /CMP : 4 channels

• Setting the output function (corresponds to column A in the procedure)

The output function can be set to any of the following. V (voltage), A (current), P (active power), VAr (reactive power), VA (apparent power), PF (power factor), VFrq (voltage frequency), AFrq (current frequency), Ph (total Watt-hour Wh), Ah (total Ampere-hour), dEG (phase angle), VP(peak value of voltage) current)*2, MATH(computation)*2, Ph+ (positive watt hour value Wh+), Ph– (negative watt hour value Wh–), Ah+ (positive ampere hour value – – – – (D/A output 0V; no further elements can be set) *1 For details concerning the positive value of the ampere hour, refer to page 7-3. *2 Available on WT110/WT130 with ROM version 2.01 or later.

), Ah– (negative ampere hour value*1),

, AP(peak value of

• Setting the element (corresponds to colum B in the operating procedure)

• WT110 (253401) no such element setting available;

• WT130 (253502) element can be selected from 1, 3 or 4

• WT130 (253503) element can be selected from 1, 2, 3 or 4 The element number 4 represents ∑.

Note

• D/A output of each display function can be done when the rated range of voltage, current and power is

5.0V FS. This is also true when scaling function is being used.

• When the scaling value is different for each element and the element is set to ∑, D/A output can be done

when the rated range is set to 5.0V FS for each element.

Setting the Integration Preset Time

The D/A output of integrated values will be 5.0V FS when the rated range has been input consequently during the preset integration time (rated integration time). Setting range : 000.00 (0 hrs 0 min) to 999.59 (999 hrs 59 min) The initial value is 1. When 000.00 is set, the D/A output value will be 0V.

Using External In / Output

IM 253401-01E

10-5

10.3 D/A Output (optional)

Relation between the output item and the D/A output voltage

• Frequency

D/A output

Approx. 7.5V

5.0V

2.5V

0.5V

0.2V 4

• Integrated value

D/A output

Approx. 7.0V

5.0V

In case of 140% of rated value input

100

10k

50k

Displayed value [Hz]

• Other items

Displayed value 140% 100% 0% –100% –140%

However, for PF and deg, points in the range from +5 to +7 V and from –5 to –7 V are not output. If there is an error, the output will be about ±7.5 V. If the MATH setting is set to efficiency, the output will be +5 V for 100%. For Vp and Ap, the output will be ±5 V when the value is three times the range rating. In addition, output will not be ±7.5 V when Vp and Ap are over the range.

Output Approx. 7.0V

5.0V 0V –5.0V Approx. –7.0V

In case of rated value input

Approx. 7.5V Approx. 7.0V

–140

–100

to:rated integration time

D/A output

5.0V

–5.0V Approx. –7.0V

Approx. –7.5V

Time

100 140

Displayed value[%]

10-6

IM 253401-01E

10.4 Comparator Function (optional)

When the instrument is equipped with option /CMP you can compare the measured/computed/ integrated/analysis values with previously set limits and these results can be output by contact relay.

Contact Relay Output

This instrument is equipped with four contact relays (4 ch) as follows. If the relay is not operating, the NC (Normally Closed) contact is closed. If the relay is operating, the NC contact is opened and the NO (Normally Open) contact is closed.

Relay specifications

• Contact rating : rated 24V/0.5A (max. 30V/0.5A)

• Minimum load : 10mV/10µA

• Operating life with load : approx. 500000 times (at contact rating)

• Operating life without load : approx. one hundred million times

• Contact Response time : less than 500ms

Note

Since this relay is subject to wear, it is excluded from the 3-year warranty.

CAUTION

Comparator Mode

Damage to the relays may occur when a voltage or current exceeding the specified range is applied to the contact output terminal.

The following two comparator modes are available.

Single Mode

If the measured/computed/integrated/analysis values exceed the previously set limits, the relay contact will become NO. This mode is useful when you want to assign each of the four relays individually. Refer to the figure below.

When the current value is less than 3A: NO-GO will be determined and the circuit becomes open. When the current value is 3A or more: GO will be determined and the circuit becomes closed.

Current

Limit of ch2 is set to 3A

NO-GO determination area

Time

Current

GO determination area

Limit of ch2 is set to 3A

Below limit ⇒ open status

24V

Exceeding limit ⇒ closed status

24V

COM

Using External In / Output

ch 2

IM 253401-01E

Time

10-7

10.4 Comparator Function (optional)

Dual Mode

This mode allows you to combine the limit values of two relays (e.g. the upper value (Hi) and the lower value (Lo)) to determine the contact status. The four relays will be fixed as two pairs of ch1 & ch2 and ch3 & ch4. Setting the limit values of a pair of relays (e.g. ch1 & ch2) can only be done at the same display function. The setting method, relay operation, etc. are the same as in the single mode, and when the measured/computed/integrated/analysis values exceed the preset limits, the contact status will become NO. The following shows an example.

When the current value exceeds 1A, but is less then 3A: GO will be ditermined and the circuit becomes closed. When the current value lies below 1A, or exceeds3A:NO-GO will be determined and the circuit becomes open.

Current

Upper limit(Hi)

Lower limit(Lo)

Current

Upper limit(Hi)

Lower limit(Lo)

Limit of ch1 is set to 3A

Limit of ch2 is set to 1A

NO-GO determination area

Time

Limit of ch1 is set to 3A

GO determination area

Limit of ch2 is set to 1A

Time

Below lower limit ⇒ open circuit

24V

Exceeding lower limit, below upper ⇒ closed circuit

24V

COM

ch 1

ch 2

ch 1

ch 2

CAUTION

Exceeding upper limit

Current

Upper limit(Hi)

Lower limit(Lo)

NO-GO determination area

Limit of ch1 is set to 3A

Limit of ch2 is set to 1A

Time

⇒ open circuit

24V

COM

Note

• In the dual mode, the combinations ch1&ch2, and ch3&ch4 are fixed. The combinations ch1&ch3 and ch2&ch4 are not possible.

• Within a pair you can set either channel as upper or lower limit.

Make sure not to greatly vary the input signal when using the comparator function. Depending on the input signal used for determination, the instrument may display error codes (i.e. overrange) and this will change the output relays as follows. When using the output relay as a control signal, make sure to match these control signals with other equipments to eliminate erroneuous control.

Displayed error Relay status

oL (over range) The NC contact is closed. oF (over flow) The NC contact is closed. dEGEr (phase angle error) The NC contact is closed. PFErr (power factor error) The NC contact is closed. ErrLo (frequency error) The NC contact is closed. ErrHi (frequency error) The NO contact is closed for this

FrqErr (frequency error in case of harmonic analysis) The NC contact is closed. —— (error when no data are present) The NC contact is closed.

case only.

ch 1

ch 2

10-8

IM 253401-01E

10.5 Setting the Comparator Mode (optional)

Relevant Keys

SAMPLE

V OVER

A OVER

MODE

V MEAN

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

RMS

hour

AVG FILTER

hour

min sec

STORE

min

VVA

123

var

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

RECALL

TIME

VPF

deg

VHz

HARMONICS

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

SHIFT

Explanation

Selecting the comparator function

(Display C)

SETUP

OUTPUT

(Display C)

ENTER

Selecting the mode

(Display C)

ENTER

Setting the Comparator Mode

The following two settings are available. For details, refer to pages 10-7, 10-8. The initial value is SinGL.

• SinGL : the comparator mode will be set to single mode;

• duAL : the comparator mode will be set to dual mode.

Note

• When you change the comparator mode after having set the comparator limit (refer to page 10-10), the situation will change as follows. Also verify the comparator limits again.

• When you change the mode to the dual mode after having set limits in the single mode, the limit of ch2 will take the value of the limit of ch1, and the limit of ch4 will take the value of the limit of ch3. When you return again to the single mode, the previous values of each channel will be restored.

ENTER

End

Using External In / Output

IM 253401-01E

CAUTION

Do not change the comparator mode, measurement mode or harmonic analysis ON/OFF, while the comparator function is in progress (ON). Similar to the Note above, changing the type of limit might result in unexpected statuses of the output relay.

10-9

10.6 Setting the Comparator Limit Values (optional)

Relevant Keys

MODE

SAMPLE

V OVER

A OVER

RMS

V MEAN

SCALING

hour

AVG FILTER

hour

min sec

STORE

min

VVA

123

var

FUNCTION

TIME

VPF

123

deg

FUNCTION ELEMENT

RECALL

VHz

HARMONICS

123

FUNCTION ELEMENT

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

• Setting the Comparator Limit Values in case of Normal Measurement

SHIFT

Selecting the comparator function

SETUP

OUTPUT

(Display C)

ENTER

(Display C)

AUTO AUTO

V RANGE A RANGE HOLD

ELEMENT

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

6.,18.

Relay setting

(Display C)

ENTER

Setting type of limit

(Display A)

ENTER

11.

ENTER

Setting limit value

(Display B)

15.

ENTER

12.

13.

Up/down

Shift cursor

SHIFT

14.

SHIFT

*1 When you press the key at step 17,

Shift decimal

point

•

ENTER

the output channel displayed at display C will change to the next channel, i.e. from ch1 to ch2 and so forth.

*2 Depends on the model number. Refer to the

specifications section for more details.

*3 Displayed on WT110/WT130 with ROM version

2.01 or later.

Setting exponent

(Display C)

16.

17.

ENTER

10-10

19.

ENTER

End

10.

SHIFT

Sets the A column

Moves to the B column

Select from 1 to 4

IM 253401-01E

10.6 Setting the Comparator Limit Values (optional)

• Setting the Comparator Limit Values in case of Harmonic Anaiysis

SHIFT

Selecting the comparator function

SETUP

OUTPUT

(Display C)

6.,20.

Relay setting

(Display C)

ENTER

21.

ENTER

End

Setting type of limit

(Display A)

Sets the A column

SHIFT

10.

Select from 1 to 3

11.

SHIFT

12.

Select from 01 to 50

ENTER

13.

ENTER

14.

15.

16.

point

Moves to the B column

Moves to the C column

(Display C)

ENTER

Setting limit value

(Display B)

Up/down

SHIFT

*1 When you press the key at step 19,

*2 Depends on the model number. Refer to the

*3 As the maximum order of harmonic analysis data

*4 The first digit is for the polarity. Select "–" in case

17.

ENTER

Setting exponent

(Display C)

18.

Shift cursor

Shift decimal

•

the output channel displayed at display C will change to the next channel, i.e. from ch1 to ch2 and so forth.

specifications section for more details.

varies by the fundamental frequency, there might be cases where no analysis data are present up to the 50th order (display show bars). In such a case, even setting the limit values will not result in proper operation.

of a negative value, and nothing incase of a positive value.

ENTER

19.

ENTER

Using External In / Output

IM 253401-01E

10-11

10.6 Setting the Comparator Limit Values (optional)

Explanation

Setting the Comparator Limit Values in case of Normal Measurement

You can set the type of the limit and its value for each relay seperately.

• Relay setting

Selects the relay (ch1 to ch4) for which the type of limit and its value will be set.

• Setting the type of limit (corresponding to column A in the procedure)

The following selections are available. When the comparator mode is dual, ch1&ch2 and ch3&ch4 are pairs and the same type of limit should be set for the channels of one pair. V (voltage), A (current), P (active power), VAr (reactive power), VA (apparent power), PF (power factor), VFrq (voltage frequency), AFrq (current frequency), Ph (total Watt-hour Wh), Ah (total Ampere-hour), dEG (phase angle), VP(peak value of voltage) current)*2, MATH(computation)*2, Ph+ (positive watt hour value Wh+), Ph– (negative watt hour value Wh–), Ah+ (positive ampere hour value – – – – (no data) *1 For details concerning the positive value of the ampere hour, refer to page 7-3. *2 Available on WT110/WT130 with ROM version 2.01 or later.

• Setting the element (corresponds to column B in the operating procedure)

• WT110 (253401) no such element setting available;

• WT130 (253502) element can be selected from 1, 3 or 4

• WT130 (253503) element can be selected from 1, 2, 3 or 4 The element number 4 represents ∑.

• Setting the limit value

No element setting is available on the WT110. Setting range: 0.000 to ±9999 Initial setting:

ch1 : V (type) : 1 (element) : 600.0 (value): E+0 (exponent) [ 600V voltage limit of

ch2 : A (type) : 1 (element) : 20.00 (value): E+0 (exponent) [ 20.00A current limit

ch3 : P (type): 1 (element) : 1.200 (value) : E+3 (exponent) [ 1.2kW active power

ch4 : PF (type) : 1 (element) : 1.000 (value) : E+0 (exponent) [ Power factor 1 limit

• Setting the exponent

The following selections are available. The initial value is as described above.

–3

E–3 (10

), E+0 (100), E+3 (103), E+6 (106)

, AP(peak value of

), Ah– (negative ampere hour value*1),

element 1 for channel 1]

of element 1 for channel 2]

limit of element 1 for channel 3]

of element 1 for channel 4]

10-12

Setting the Comparator Limit Values in case of Harmonic Analysis

You can set the type of the limit and its value for each relay seperately.

• Relay setting

Selects the relay (ch1 to ch4) for which the type of limit and its value will be set.

• Setting the type of limit (corresponding to column A in the procedure)

The following selections are available. When the comparator mode is dual, ch1&ch2 and ch3&ch4 are pairs and the same type of limit should be set for the channels of one pair. V (voltage), A (current), P (active power), PF (power factor), Vt (harmonic distortion of voltage), At (harmonic distortion of current), CV (relative harmonic content of each voltage harmonic order), CA (relative harmonic content of each current harmonic order), CP (relative harmonic content of each active power harmonic order), Vd (voltage phase angle of each order), Ad (current phase angle of each order), – – – – (no data) * For details concerning the meaning of harmonic analysis values, refer to chapter 8.

•Setting the element (corresponds to column B in the operating procedure)

• WT110 (253401) no such element setting available;

• WT130 (253502) element can be selected from 1 or 3

• WT130 (253503) element can be selected from 1, 2 or 3

IM 253401-01E

10.6 Setting the Comparator Limit Values (optional)

Setting the harmonic order (corresponds to column C in the procedure)

Setting range: 01 to 50 Initial value: refer to the following. The maximum order of harmonic analysis data varies by the fundamental frequency. Therefore, there might be cases where no analysis data are present up to the 50th order (and the display will show bars). In such a case, even if you set an harmonic order, determination will not be carried out. Therefore, before setting, verify the maximum order (chapter 15) and the fundamental frequency of the object of measurement.

• Setting the limit value

No element setting is available on the WT110. Setting range : 0.000 to ±9999 Initial setting :

ch1 : V (type) : 1 (element) : 600.0 (value): E+0 (exponent) [ 600V voltage limit of

element 1 for channel 1]

ch2 : A (type) : 1 (element) : 20.00 (value): E+0 (exponent) [ 20.00A current limit

of element 1 for channel 2]

ch3 : P (type) : 1 (element) : 1.200 (value): E+3 (exponent) [ 1.2kW active power

limit of element 1 for channel 3]

ch4 : PF (type) : 1 (element) : 1.000 (value) : E+0 (exponent) [ Power factor 1 limit

of element 1 for channel 4]

• Setting the exponent

The following selections are available. The initial value is as described above.

–3

E–3 (10

), E+0 (100), E+3 (103), E+6 (106)

Note

• When you use limit values based on harmonic analysis data, make sure to set the harmonic analysis function to ON (page 8-5) before you set the comparator function ON (page 10-16).

• Although the four relays used in case of normal measurement and in case of harmonic analysis are the same, the contents of the settings will be kept for both seperately. For example, even after setting a limit for ch1 in case of harmonic analysis after previously having set a limit for ch1 in case of normal measurement, will result in keeping both values.

• The determination method does not change as a result of – (minus) limit values. For example, if a limit of –1 is set, the relay will not be activated when the input signal value reaches –2 coming from an even lower value, but will be activated when the input signal value becomes 0.

• Make sure to set the polarity of the phase angle as well, + for phase lead (and can be ignored), – for phase lag.

Using External In / Output

IM 253401-01E

10-13

10.7 Comparator Display (optional)

Relevant Keys

MODE

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1 . The confirmed settings made until that point will be kept.

SAMPLE

V OVER

A OVER

RMS

V MEAN

hour

AVG FILTER

hour

min sec

STORE

min

VVA

123

var

FUNCTION

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

RECALL

TIME

VPF

deg

VHz

HARMONICS

AUTO AUTO

V RANGE A RANGE HOLD

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

SHIFT

SETUP

OUTPUT

Selecting the comparator function

(Display C)

ENTER

Selecting the display function

(Display C)

ENTER

(Display C)

ENTER

End

10-14

IM 253401-01E

Explanation

VA var

TIME

deg

VHz

var

TIME

m k

deg

VHz

10.7 Comparator Display (optional)

Comparator Display Function

This function allows you to verify the set limits together with measurement/computation/ analysis data on the display when using the comparator function. The display is as follows, depending on whether the comparator function is set to single or dual mode.

• Display in case the comparator function is set to single mode

channel (Relay)

(Selectable from ch1 to ch4 by )

Unit k, m, M (Applies to each corresponding

Unit (Corresponding to the relay on displayA)

display)

Input element (Corresponding to the relay on

displayA)

Measurement/computation/analysis data (Corresponding to the relay on displayA)

Limit value (Corresponding to the relay on displayA)

• Display in case the comparator function is set to dual mode

Unit k, m, M (Applies to each corresponding

Limit ralue (Display the limit value of ch1

or ch3 by )

Unit (Corresponding to the relay on displayA)

Input element (Corresponding to the relay on

Measurement/computation/analysis data (Corresponding to the relay on displayA and B)

display)

displayA)

Using External In / Output

IM 253401-01E

Limit value (Displays the limit value of ch2 or ch4 by )

*1 The limit values on display A and B will show the pairs of ch1&ch2

and ch3&ch4 alternately by pressing the keys.

Comparator Display Function ON/OFF

This setting allows you to turn the above described display function ON or OFF.

•oN: The comparator display will appear by pressing the ENTER key after selecting “on”;

• oFF : The normal measurement or harmonic analysis display will appear by pressing the ENTER key after selecting “oFF”.

Note

• Pressing the FUNCTION or ELEMENT key will result in an error. Other keys can be operated.

• Determination is done by internal data of the input signal, and not by displayed data. For example, when

the limit is set to 10.00 and the internal data of the input signal coming from a lower value reaches 9.999, the relay will not be activated. Only when the internal data reaches a value of 10.000, the relay will be activated.

10-15

10.8 Turning the Comparator Function ON/OFF (optional)

Relevant Keys

MODE

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

SAMPLE

V OVER

A OVER

RMS

V MEAN

hour

AVG FILTER

hour

min sec

STORE

min

VVA

123

var

FUNCTION

TIME

VPF

123

deg

FUNCTION ELEMENT

RECALL

VHz

HARMONICS

123

FUNCTION ELEMENT

AUTO AUTO

V RANGE A RANGE HOLD

ELEMENT

MODE

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

INTERFACE OUTPUT

1Φ3W 3Φ4W

ENTER

INTEGRATOR

STOP RESET

SETUP

3Φ3W

WIRING

3V3A

TRIG

SHIFT

Displays relevant keys and indicator

Explanation

CAUTION

SHIFT

SETUP

OUTPUT

(Display C)

ENTER

(Display C)

ENTER

End

Turning the Comparator Function ON/OFF

After having set all the items described on the previous pages, turn the comparator function ON.

•oN: The comparator function will start by pressing the ENTER key after selecting “on”;

• oFF : The comparator function will stop by pressing the ENTER key after selecting “oFF”.

• After having turned ON the comparator function, do not change the comparator mode. Changing the type of limit might result in unexpected statuses of the output relay.

• Make sure not to greatly vary the input signal before turning the comparator function ON. Depending on the input signal used for determination, the instrument may display error codes (i.e. overrange) and this will change the output relays as described on page 10-8. When using the output relay as a control signal, make sure to match these control signals with other equipments to eliminate erroneuous control.

Selecting the comparator function

10-16

IM 253401-01E

10.9 Outputting to an External Plotter / Printer

Relevant Keys

SAMPLE

V OVER

A OVER

MODE

V MEAN

SCALING

*Shows the operation panel of the WT130. For the differences

between WT110 and WT130, refer to section 2.2, page 2-2, 2-3

Operating Procedure

• Perform operations following the thick line in the below menu.

• Press the ENTER key to confirm the selection or setting.

• When you want to leave the current menu during operation, press the key described under step 1. The confirmed settings made until that point will be kept.

•Setting the Output Mode

LOCAL

INTERFACE

SHIFT

Communication settings depend on your communication interface. Refer to Ch.11 or 12 for the menu. This menu only appears in case of version 1.11 and later.

For instruments earlier than version 1.11, the setting ends at step 3. PCL is displayed on WT110/WT130 with version 2.21 or later.

• Setting the Output Items

SHIFT

OUTPUT

Setting the output Mode

SETUP

Communication setting

RMS

hour

(Display C)

hour

min sec

AVG FILTER

ENTER

min

VVA

123

var

FUNCTION

TIME

VPF

deg

VHz

RECALL

STORE

Setting plotter or printer

HARMONICS

(Display C)

End End

(Display C)

ELEMENT

123

FUNCTION ELEMENT

123

FUNCTION ELEMENT

ENTER

AUTO AUTO

V RANGE A RANGE HOLD

MODE

STOP RESET

START

HARMONICS MEMORY INTEG SET

REMOTE

LOCAL

SETUP

INTERFACE OUTPUT

1Φ3W

3Φ3W

3Φ4W

3V3A

If the communication interface that you purchased is an RS-232-C, the menu proceeds to the "Selecting handshaking method" menu of page 12-4. Set the relevant parameters such as the handshaking method, format, and baud rate, then press the complete the settings. If the communication interface is a GPIB, the procedure ends at step 5.

Setting the output items

ENTER

TRIG

ENTER

INTEGRATOR

SHIFT

WIRING

ENTER

(Display C)

Displays relevant keys and indicator

key to

Using External In / Output

ENTER

End

IM 253401-01E

• Activating the Output

SHIFT

SETUP

OUTPUT

Activating the output

(Display C)

ENTER

End

Selecting data or set-up

parameters

(Display C)

*1 This menu only appears in case of version 1.11 and higher.

ENTER

End

SHIFT

Sets the A column

Moves to the B column

Select from 1 to 3

For instruments lower than version 1.11, the setting ends at step 3.

10-17

10.9 Outputting to an External Plotter / Printer

Explanation

Setting the Output (Printing) Mode

This setting is to select whether you are printing out on a plotter or a printer. HPGL : For printing on an external, HPGL - compatible plotter. ESCP : For printing on an external, ESC / P - compatible printer. PCL : For printing on an external, PCL5 (printer language of HP) - compatible printer. This

mode is available on WT110/WT130 with version 2.21 or later.

Setting the Output Contents in case of Normal Measurement

All measured / computed data will be output.

Setting the Output Items and the Element in case of Harmonic Analysis

• Setting the Output Item (Column A)

One of the following items should be set, which then will be printed out on an external plotter/ ptinter. The initial value is V. V:Prints the numerical values of the analysis value and relative harmonic content of the

voltage;

A:Prints the numerical values of the analysis value and relative harmonic content of the

current;

P:Prints the numerical values of the analysis value and relative harmonic content of the

active power; dEG : Prints the numerical values of the phase angle; G-V : Prints the numerical values G-A : Prints the numerical values G-P : Prints the numerical values*1 and the graph of the analyzed active power values; G-Vd : Prints the numerical values*1 and the graph of the phase angle between each voltage of

the 2nd to 50th order and the fundamental (1st order); G-Ad : Prints the numerical values

the 2nd to 50th order and the fundamental (1st order); CG-V : Prints the numerical values CG-A : Prints the numerical values*1 and the graph of the relative harmonic content of current; CG-P : Prints the numerical values*1 and the graph of the relative harmonic content of active

power; ALL : Prints the numerical values

harmonic content of voltage and current (V and A are both printed). *1 HPGL/PCL plotters print both numerical values and the graph, but ESCP printers only print

the graph.

and the graph of the analyzed voltage values;

and the graph of the analyzed current values;

and the graph of the phase angle between each current of

and the graph of the relative harmonic content of voltage;

and the graph of the analysis values and relative

10-18

• Setting the Element (Column B)

One of the following should be set. The output items corresponding to the set element will then be printed out on an external plotter. The initial value is 1. In case of the WT110, this setting is always 1.

1: Select this when the output items of element 1 should be printed out; 2: Select this when the output items of element 2 should be printed out; This setting is not

available on model 253502.

3: Select this when the output items of element 3 should be printed out.

Executing Output

After having connected the external plotter / printer to this instrument, execute the output of data.

dATA : All data selected as output items will be output. PnL : All set-up parameters will be output.

IM 253401-01E

YOKOGAWA WT110, WT130 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Foreword

Checking the Contents of the Package

Safety Precautions

How to Use this Manual

Conventions Used in this Manual

Contents

1.1 System Configuration and Block Diagram

1.2 Functions

1.3 Digital Numbers/Characters, and Initial Menus

2.1 Front Panel, Rear Panel and Top View

2.2 Operation Keys and Function/Element Display

2.3 Displays in case of Overrange / Error during Measurement

3.1 Usage Precautions

3.2 Installing the Instrument

3.3 Wiring Precautions

3.4 Wiring the Measurement Circuit

3.5 Wiring the Measurement Circuit when Using External PT/CT

3.6 Wiring the Measurement Circuit when Using the External Sensor

3.7 Connecting the Power Supply

3.8 Turning the Power ON/OFF

3.9 Selecting the Wiring Method (for WT130)

3.10 Improving the Measurement Accuracy

4.1 Selecting the Measurement Mode

4.2 Turning the Filter ON/OFF

4.3 Selecting the Measurement Range in case of Direct Input

4.4 Setting the Scaling Value when External PT/CT is Used

4.5 Selecting the Measurement Range and Setting the Scaling Value when External Sensor is Used (option)

4.6 Using the Averaging Function

4.8 Computing the Crest Factor (Applies to WT110/ WT130 with ROM Version 2.01 or later)

4.9 Computing the Efficiency (Applies to WT130 with ROM Version 2.01 or later)

5.2 Measuring/Displaying Frequency

6.2 Computing/Displaying the Phase Angle

7.1 Integrator Functions

7.2 Setting Integration Mode and Integration Timer

7.3 Displaying Integrated Values

7.4 Precautions Regarding Use of Integrator Function

8.1 Harmonic Analysis Function

8.2 Setting the Element, PLL Source and Harmonic Distortion Method

9.1 Storing/Recalling Measured Data

9.2 Storing/Recalling Set-up Parameters

10.1 Remote Control and D/A Output Connector (optional)

10.2 Remote Control (optional)

10.3 D/A Output (optional)

10.4 Comparator Function (optional)

10.5 Setting the Comparator Mode (optional)

10.6 Setting the Comparator Limit Values (optional)

10.7 Comparator Display (optional)

10.8 Turning the Comparator Function ON/OFF (optional)

10.9 Outputting to an External Plotter / Printer