YOKOGAWA WT200 User Manual

Download

Digital Power Meter

IM 253421-01E

1st Edition

Notes

Trademarks

Revisions

Thank you for purchasing the YOKOGAWA WT200 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 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.

Company and product names that are used in this manual are trademarks or registered trademarks of their respective holders.

1st Edition: April 2000

IM 253421-01E

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.

WT200 Main Unit

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.

WT200 (model code: 253421)

MODEL SUFFIX

NO.

Madein Japan

MODEL SUFFIX

NO.

Made inJapan

Model and Suffix codes

Model code Suffix code Specifications

253421.........................................WT200

Power cord -D ..................... UL,CSA Standard Power Cord (Part NO.: A1006WD)

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

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

-Q ..................... BS Standard Power Cord (Part No.: A1054WD)

Options

Communication Interface /C1.......GP-IB interface

(Select either one) /C2.......RS-232-C interface

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

(Select either one) /EX2 .... 50/100/200 mV range

Harmonic analysis function /HRM ... – External input/output function /DA4 ... 4-channel D/A output

(Select either one) /CMP .. 4-channel comparator, 4-channel D/A output

Ex: GP-IB interface, with UL/CSA power cord, with external sensor input 50/100/200 mV range,

with harmonic analysis function, and 4 channels D/A output →253421-D/C1/EX2/HRM/DA4

[Maximum rated voltage: 125 V; Maximum rated current: 7 A]

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

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

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

NO. (instrument number)

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

IM 253421-01E

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 ii 1 — 2 24-pin connector A1004JD 1 For remote, D/A output

3 Rubber feet A9088ZM 1 set 4 User’s Manual IM253421-01E 1 this manual

Checking the Contents of the Package

(only provided with options /DA4 or /CMP)

1. An appropriate power cord according to the instrument's suffix code is supplied.

D F

2. 3.

Note

We recommend you keep the packing box. The box is useful when you need to transport the instrument.

IM 253421-01E

iii

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 following 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 253421-01E

Safety Precautions

Make sure to comply with the following safety precautions. Not complying might result in injury or death.

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

The power fuse of this instrument cannot be replaced by the user, because it is located inside the case. If you believe the fuse inside the case is blown, contact your nearest YOKOGAWA dealer as listed on the back cover of this manual.

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 253421-01E

Structure of this Manual

This User's Manual consists of the following 16 chapters and an index.

Chapter 1 Functional Overview and Digital Display

Chapter 2 Names and Uses of Parts and the Overrange and Error Displays

Chapter 3 Before Starting Measurements

Chapter 4 Setting Measurement Conditions and Measurement Range

Chapter 5 Displaying the Results of the Measurement and Computation

Chapter 6 Integration

Chapter 7 Using the Harmonic Analysis Function (Optional)

Chapter 8 Storing/Recalling Measured Data and Setting Parameters from the Internal

Chapter 9 Using External Input/Output

Chapter 10 Using the GP-IB Interface (Optional)

Chapter 11 Using the RS-232-C Interface (Optional)

Chapter 12 Initializing Setup Parameters and Performing Zero Level Compensation

Chapter 13 Communication Commands 1 (System of Commands before the IEEE 488.2-

Chapter 14 Communication Commands 2 (System of Commands Complying to the IEEE

Chapter 15 Adjustment, Calibration and Trouble-Shooting

Chapter 16 Specifications

Index Index of contents.

Describes the input signal flow, functional overview, digital numbers/characters, initial menus that are displayed when a key is pressed, and other information..

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 displaying the voltage, current, active power, apparent power, reactive power, power factor, phase angle, frequency, peak value, value derived from four arithmetical operations, and crest factor.

Explains the procedures for integration of active power and current.

Explains the procedures when using the harmonic analysis function.

Memory

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 setting parameter and initializing settings.

1987 Standard)

Describes communication commands and sample programs that follow the rules that existed before the establishment of the IEEE 488.2-1987 Standard.

488.2-1987 Standard)

Describes communication commands and sample programs that comply with the IEEE 488.2-1987 Standard.

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 253421-01E

Conventions Used in this Manual

Symbols Used

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

A symbol mark affixed to the instrument. Indicates danger to personnel or instrument and the operator must see the User's Manual. The symbol is used in the User's Manual to indicate the reference.

WARNING

CAUTION

Note

Displayed Characters on the 7-Segment LED

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, see section 1.3.

Describes precautions that should be observed to prevent the danger of 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.

IM 253421-01E

vii

Conventions Used in this Manual

Markings used for Descriptions of Operations

Keys

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

Procedure

The procedure is explained by a flow diagram. For the meaning of each operation, see 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

(Display C)

ENTER

SHIFT

SETUP

OUTPUT

(Display C)

ENTER

End of setting

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.

viii

IM 253421-01E

Checking the Contents of the Package ...........................................................................................ii

Safety Precautions .........................................................................................................................iv

Structure of this Manual .................................................................................................................vi

Conventions Used in this Manual..................................................................................................vii

Chapter 1 Functional Overview and Digital Display

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 Names and Uses of Parts and the Overrange and Error Displays

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

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

2.3 Displays in case of Overrange/Error during Measurement .............................................. 2-3

Chapter 3 Before Starting Measurements

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

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

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

3.4 Improving the Measurement Accuracy............................................................................. 3-6

3.5 Connecting the Power Supply.......................................................................................... 3-7

3.6 Wiring the Measurement Circuit....................................................................................... 3-8

3.7 Wiring the Measurement Circuit when Using External PT/CT ......................................... 3-9

3.8 Wiring the Measurement Circuit when Using the External Sensor ................................ 3-10

3.9 Turning the Power ON/OFF, Opening Messages...........................................................3-12

Chapter 4 Setting Measurement Conditions and Measurement Range

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

4.2 Selecting the Measurement Synchronization Source ...................................................... 4-3

4.3 Turning the Filter ON/OFF ............................................................................................... 4-4

4.4 Selecting the Measurement Range in case of Direct Input.............................................. 4-5

4.5 Setting the Scaling Constant when External PT/CT is Used ...........................................4-8

4.6 Selecting the Measurement Range and Setting the Scaling Constant when External

Sensor is Used (option) ................................................................................................. 4-10

4.7 Using the Averaging Function ........................................................................................ 4-12

4.8 Using the MAX Hold Function ........................................................................................ 4-14

4.9 Using the Four Arithmetical Operation Function ............................................................ 4-15

4.10 Computing the Crest Factor........................................................................................... 4-18

4.11 Computing the Average Active Power during Integration............................................... 4-19

4.12 Selecting the Number of Displayed Digits...................................................................... 4-20

Chapter 5 Displaying the Results of the Measurement and Computation

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

5.2 Displaying Apparent Power, Reactive Power, and Power Factor.....................................5-3

5.3 Displaying the Phase Angle ............................................................................................. 5-4

5.4 Displaying the Frequency ................................................................................................ 5-5

5.5 Displaying Peak Value, Four Arithmetic Operation Value, and Crest Factor.................... 5-7

Index

IM 253421-01E

Contents

Chapter 6 Integration

6.1 Integrator Functions ......................................................................................................... 6-1

6.2 Setting Integration Mode, Integration Type, and Integration Timer .................................. 6-4

6.3 Displaying Integrated Values ........................................................................................... 6-6

6.4 Precautions Regarding Use of Integrator Function .......................................................... 6-9

Chapter 7 Using the Harmonic Analysis Function (Optional)

7.1 Harmonic Analysis Function............................................................................................. 7-1

7.2 Setting the PLL Source and Harmonic Distortion Method................................................ 7-3

7.3 Switching the Harmonic Analysis Function ON/OFF........................................................ 7-5

7.4 Setting the Harmonic Order and Displaying the Results of Harmonic Analysis ............... 7-6

Chapter 8 Storing/Recalling Measured Data and Setting Parameters from the

Internal Memory

8.1 Storing/Recalling Measured Data .................................................................................... 8-1

8.2 Storing/Recalling Setting Parameters .............................................................................. 8-5

Chapter 9 Using External Input/Output

9.1 Remote Control and D/A Output Connector (optional)..................................................... 9-1

9.2 Remote Control (optional) ................................................................................................ 9-2

9.3 D/A Output (optional) ....................................................................................................... 9-3

9.4 Comparator Function (optional) ....................................................................................... 9-7

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

9.6 Setting the Comparator Limit Values (optional).............................................................. 9-11

9.7 Comparator Display (optional) ....................................................................................... 9-15

9.8 Turning the Comparator Function ON/OFF (optional).................................................... 9-17

9.9 Outputting to an External Plotter or Printer .................................................................... 9-18

Chapter 10 Using the GP-IB Interface (Optional)

10.1 GP-IB Interface Functions and Specifications ............................................................... 10-1

10.2 Responses to Interface Messages................................................................................. 10-3

10.3 Status Byte Format (before the IEEE 488.2-1987 Standard)......................................... 10-4

10.4 Output Format................................................................................................................ 10-5

10.5 Setting the Address/Addressable Mode....................................................................... 10-11

10.6 Setting the Output Items .............................................................................................. 10-13

10.7 System of Commands before the IEEE 488.2-1987 Standard .................................... 10-16

Chapter 11 Using the RS-232-C Interface (Optional)

11.1 RS-232-C Interface Functions and Specifications ......................................................... 11-1

11.2 Connecting the Interface Cable ..................................................................................... 11-3

11.3 Setting the Mode, Handshaking Method, Data Format and Baud Rate ......................... 11-6

11.4 Format and Commands of Output Data (before the IEEE 488.2-1987 Standard) ......... 11-9

Chapter 12

Initializing Setup Parameters and Performing Zero Level Compensation

12.1 Back-up of Setting Parameters...................................................................................... 12-1

12.2 Initializing Setting Parameters ....................................................................................... 12-2

12.3 Performing Zero Level Compensation ........................................................................... 12-4

IM 253421-01E

Contents

Chapter 13 Communication Commands 1 (System of Commands before the

IEEE 488.2-1987 Standard)

13.1 Commands.....................................................................................................................13-1

13.2 Sample Program.......................................................................................................... 13-13

13.3 For Users Using Communication Commands of Digital Power Meter 2533E.............. 13-21

Chapter 14 Communication Commands 2 (System of Commands Complying to

the IEEE 488.2-1987 Standard)

14.1 Overview of IEEE 488.2-1987........................................................................................14-1

14.2 Program Format............................................................................................................. 14-3

14.2.1 Symbols Used in Syntax Descriptions ............................................................... 14-3

14.2.2 Messages........................................................................................................... 14-3

14.2.3 Commands......................................................................................................... 14-5

14.2.4 Responses ......................................................................................................... 14-7

14.2.5 Data ................................................................................................................... 14-7

14.2.6 Synchronization with the Controller ................................................................... 14-9

14.3 Commands...................................................................................................................14-10

14.3.1 Command List.................................................................................................. 14-10

14.3.2 AOUTput Group ............................................................................................... 14-14

14.3.3 COMMunicate Group ....................................................................................... 14-15

14.3.4 CONFigure Group............................................................................................ 14-17

14.3.5 DISPlay Group ................................................................................................. 14-21

14.3.6 HARMonics Group ........................................................................................... 14-22

14.3.7 INTEGrate Group............................................................................................. 14-23

14.3.8 MATH ............................................................................................................... 14-24

14.3.9 MEASure Group............................................................................................... 14-25

14.3.10 RECall Group................................................................................................. 14-32

14.3.11 RELay Group ................................................................................................. 14-33

14.3.12 SAMPle Group ............................................................................................... 14-35

14.3.13 ST ATus Group................................................................................................ 14-36

14.3.14 STORe Group ................................................................................................ 14-37

14.3.15 Common Command Group............................................................................ 14-38

14.4 Status Report............................................................................................................... 14-41

14.4.1 Overview of the Status Report ......................................................................... 14-41

14.4.2 Status Byte....................................................................................................... 14-42

14.4.3 Standard Event Register.................................................................................. 14-43

14.4.4 Extended Event Register ................................................................................. 14-44

14.4.5 Output Queue and Error Queue....................................................................... 14-45

14.5 Sample Program.......................................................................................................... 14-46

14.6 ASCII Character Codes ............................................................................................... 14-50

14.7 Communication-related Error Messages ..................................................................... 14-51

Chapter 15 Maintenance and Troubleshooting

15.1 Adjustments ................................................................................................................... 15-1

15.2 Calibration...................................................................................................................... 15-5

15.3 In Case of Malfunctioning ............................................................................................ 15-11

15.4 Error Codes and Corrective Actions............................................................................. 15-12

15.5 Replacing the Fuse...................................................................................................... 15-14

15.6 Recommended Replacement Parts............................................................................. 15-15

Index

IM 253421-01E

Contents

Chapter 16 Specifications

16.1 Input............................................................................................................................... 16-1

16.2 Measurement Functions ................................................................................................ 16-3

16.3 Frequency Measurement............................................................................................... 16-5

16.4 Communication (optional).............................................................................................. 16-5

16.5 Computing Functions..................................................................................................... 16-5

16.6 Display Functions........................................................................................................... 16-6

16.7 Integrator Function......................................................................................................... 16-6

16.8 Internal Memory Function .............................................................................................. 16-7

16.9 D/A Converter (optional) ................................................................................................ 16-7

16.10 External Input (optional)................................................................................................. 16-7

16.11 Comparator Output (optional) ........................................................................................ 16-7

16.12 External Contorol and Input Signals (in combination with the D/A converter and

comparator options) ....................................................................................................... 16-8

16.13 Total Harmonic Analysis Function (optional) .................................................................. 16-8

16.14 General Specifications ................................................................................................... 16-9

16.15 External Dimensions .................................................................................................... 16-10

Index

xii

IM 253421-01E

Chapter 1 Functional Overview and Digital Display

1.1 System Configuration and Block Diagram

System Configuration

Block Diagram

VOLTAGE INPUT

LPF

CURRENT INPUT

LPF

Equipment

under

test

A/D

Zero Cross

A/D

Zero Cross

INPUT

Detector

sensor

ISO

Ext.

Voltage

input

Current

input

A/D

interface

Lead/Lag

Detector

EEPROM

DSP

Input either one

WT200 (253421)

COUNTER × 2 CLOCK

Contact / relay output

Analog output

GP-IB or

RS-232-C

CPU

SAMPLING

CLOCK

Bus

Arbiter

FREQUENCY

HARMONICS

PLL DMAC RAM

(Option)

Arbiter

CPU

Bus

Recorder

Personal

Computer

Ext. printer

or plotter

ROM RAM

KEY&DISPLAY

CONTROLLER

GP-IB

RS-232-C

D/A OUTPUT

EEPROM

(Option)

COMPARATOR

(Option)

Functional Overview and Digital Display

IM 253421-01E

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, the input current passes through a shunt resistor that forms a closed circuit. The voltage across shunt resistor is amplified and normalized and then input 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, four-wire model. 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, and scaling is carried out. Control of display and outputs is also performed by the CPU.

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 10 Hz to 50 kHz.

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 wiring method indicates the circuit configuration used to measure the voltage, current, and power. The WT200 uses a single-phase, two-wire (1φ2W) wiring method.

Display Functions

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

Peak Measurement Function

This function measures the peak values of the voltage and current. This value is used to compute the crest factor.

MAX Hold Function

This function holds the maximum values of the voltage, current, active power, apparent power, reactive power, voltage peak, and current peak. It holds the maximum value that exists while the MAX hold function is enabled.

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

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.

Averaging

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.

Four Arithmetic Operation

Results from six types of arithmetic operations can be displayed. (A+B, A–B, A

/B, A/B2)

*B, A/B,

1-2

Crest Factor

This function determines the crest factor of the voltage and current using peak and RMS values.

IM 253421-01E

1.2 Functions

Integrator Functions

Average active power during integration

This function computes the average active power within the integration period. It is derived by dividing the watt hour (integrated active power) by the elapsed time of integration.

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.

The following two integration methods are available:

• Standard type Integrates the active power or current that is obtained using the normal measurement method, which obtains the active power or current from the sampled data over the period that is synchronized to the input signal. Select the standard type for steadystate input signals that have a constant period such as a sinusoid.

• Advanced type Integrates the active power or current obtained over a fixed period of sampled data, irrespective of the period of the input signal. Select the advanced type for intermittent signals with a frequency of 50 or 60 Hz.

Functional Overview and Digital Display

Frequency Measurement Function

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

Harmonic Analysis Function (optional)

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). Furthermore, the total rms value (fundamental + harmonic) of the voltage, current and active power, and the harmonic distortion factor (THD) can be calculated.

Storing/Recalling 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 (optional)

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 ±5 V. Output items of up to 4 channels can be selected.

Comparator Function (optional)

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 253421-01E

1-3

1.2 Functions

Remote Control Functions (optional)

External Input

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

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

EXT TRIG (when option /DA4 is installed)

Updates the displayed values in hold mode.

EXT START (when option /DA4 is installed)

Starts integration.

EXT STOP (when option /DA4 is installed)

Stops integration.

EXT RESET (when option /DA4 is installed)

Resets the integration results.

External Output

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

Outputs continuously from integration start through integration stop.

Communication Functions (Option)

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 and Printer

Measured/computed data can be printed on an external plotter or printer using the GPIB or RS-232-C interface.

Other Useful Functions

Backup of Setting Parameters

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

Initializing Setting Parameters

This function enables you to reset the setting parameters to initial (factory) settings.

Zero-level compensation

Zero level compensation refers to creating a zero input condition inside the WT200 and setting the level at that point as the zero level. Zero level compensation must be performed in order to satisfy the specifications of this instrument. When the measurement range is changed, zero level compensation is performed automatically. However, if the measurement range is not changed for a long time, the zero level may shift due to environmental changes around the instrument. In such case, you can manually perform zero level compensation.

1-4

IM 253421-01E

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.

Initial Menus

0 1 2 3 4 5 6 7 8 9

A B

Small c

C D E F G

Small h

H I J

K L M N O P Q R S T

U V W X Y Z

− × ÷

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

(Display C)

^(Exponent)

Functional Overview and Digital Display

• Current Range Setting

A RANGE

(Display C)

(A) (A)

(A) (A) (A) (A) (mA) (mA)

(mA) (mA) (mA) (mA)

When equipped with option /EX1 (Display C)

(A) (A)

(A) (A) (A) (A) (mA) (mA)

(mA) (mA) (mA) (mA) (V) (V)

(V)

When equipped with option /EX2 (Display C)

(A) (A)

(A) (A) (A) (A) (mA) (mA)

(mA) (mA) (mA) (mA) (mV) (mV)

(mV)

IM 253421-01E

1-5

1.3 Digital Numbers/Characters, and Initial Menus

Setting the Filter, Averaging, Scaling, Ext. Sensor Input,

• and Initializing Setting Parameters

SETUP

( Display C )

• Integration Setting

SHIFT

RESET

INTEG SET

(Filter setting) (Averaging setting) (Scaling setting) (Ext. sensor input setting) (Initiallizing set-up parameters) (Computation, crest factor settings) (Measurement synchronization source setting) (MAX hold setting) (Number of displayed digits)

( Display C )

(Setting integration mod) (Setting integration timer) (Setting integration preset time) (Integration type setting)

• Turning the Harmonic Analysis Function ON/OFF

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 setting parameters) (Recalling setting parameters)

• Setting Output

( Display C )

(Setting items for communication,

plotter, or printer output)

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

SHIFT

SETUP

OUTPUT

1-6

IM 253421-01E

1.3 Digital Numbers/Characters, and Initial Menus

SHIFT

LOCAL

INTERFACE

( Display C )

(Setting normal mode) (Setting talk-only mode)

• Setting Communication Interface (RS-232-C)

(Setting communication commands according to IEEE 488.2-1987)

(Print mode setting: Setting plotter

or printer output)

• Setting Communication Interface (GP-IB)

SHIFT

LOCAL

INTERFACE

( Display C )

(Print mode setting: Setting plotter

(Setting addressable mode A) (Setting addressable mode B) (Setting talk-only mode)

or printer output)

(Setting communication commands according to IEEE 488.2-1987)

Functional Overview and Digital Display

IM 253421-01E

1-7

Chapter 2 Names and Uses of Parts and the Overrange and Error Displays

2.1 Front Panel, Rear Panel and Top View

Front Panel

Rear Panel

7-segment display

Function/Unit display

Operation keys

Power switch

page 3-12

→

External sensor input terminal

page 3-10

→

Ventilation slot

Current input terminal

page 3-8 to 3-11

→

Voltage input terminal

page 3-8 to 3-11

→

page 2-2

→

Names and Uses of Parts and the Overrange and Error Displays

Handle

Top View

Ext. I/O connector

→

chapter 9

Rear panel

Power connector

page 3-7

→

GP-IB or RS-232-C connector

→

chapter 10, 11

Ventilation slot

IM 253421-01E

Front panel

2-1

2.2 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 (section 4.4).

A RANGE

Shows the current range setting menu (section 4.4).

V RANGE

SHIFT

MODE

Switches between modes (section 4.1).

AUTO indicator

Lights up when range is AUTO.

FUNCTION

Sets the displayed function (chapter 5, sections 6.3 and 7.4).

Function/unit display

A RANGE

SHIFT

Turns ON/OFF the MAX hold function.

MAX HOLD

When turned ON, the MAX HOLD indicator lights. This is the same as the MAX hold setting under the SETUP key (section 4.8).

HOLD

Holds the displayed value. The HOLD indicator lights. Pressing the key again turns OFF the indicator and releases the hold.

HOLD

SHIFT

When in the HOLD condition this results in

TRIG

updating the displayed value.

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

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

VA var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

START

HARMONICS

SHIFT

Shows the setting menu for harmonics ON/OFF, PLL source, and element selection (sections 7.2 and 7.3).

STOP

SHIFT

MEMORY

Shows the setting menu for storing/recalling measurement data and set-up information (chapter 8).

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.

LOCAL

INTERFACE

SHIFT

Shows the setting menu for communication/printing (sections 9.9, 10.5, and 11.3).

SETUP

SHIFT

OUTPUT

Shows the setting menu for communication output items, D/A output, plotter/printer output and comparator output (sections 9.3,

9.5 to 9.9, and 10.6).

Indicators for operating functions

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

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

CAL

INTEGRATOR

STOP RESET

MEMORY INTEG SET

SETUP

Sets the filter, averaging, scaling, computation, external sensor input, measurement synchronization source, MAX hold, and the initialization of the set-up information (see sections 4.2, 4.3, 4.5 to 4.11, and 12.2).

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.

SHIFT

Moves the decimal point from left to right.

ENTER

SHIFT

CAL

Performs zero level compensation (section 12.3).

START

Starts integration (see section 6.3).

STOP

Stops integration (see section 6.3).

RESET

Sets the integration value and elapsed time of integration to zero (0) (see section 6.3).

SHIFT

RESET

INTEG SET

Shows the setting menu for integration mode/type/time, and rated integration time (see sections 6.2 and 9.3).

2-2

IM 253421-01E

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

Names and Uses of Parts and the Overrange and Error Displays

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.

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 (see section 4.1, “Selecting the Measurement Mode”).

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 is changed and the contents of the display changes, the display will indicate as follows.

IM 253421-01E

2-3

Chapter 3 Before Starting Measurements

3.1 Usage Precautions

Safety Precautions

• Before using the instrument for the first time, make sure you have read the safety precautions on pages iv and v.

• 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.Refer to page ii for the part number of the appropriate power cord when placing an order.

Before Starting Measurements

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.

• 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.

IM 253421-01E

• 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.

• 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

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 20 mm 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.

Installation Position

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 16 “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.

Desktop

As shown below, place the instrument on a flat even surface. When using the handle for installation, check that the handle is in one of the fixed positions. To change the fixed position of the handle, pull the handle approximately 2 to 3 mm outward along the rotational axis and slowly move the handle.

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.)

Turning axis

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

3-2

IM 253421-01E

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 EIA Standard (for single mount) JIS Standard (for single mount) EIA Standard (for multiple mount) JIS Standard (for multiple mount)

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

• Mounting procedure

1. Turn the handle to position 8 (see the figure on the previous page) and remove it by pulling the handle outward along the rotational axis approximately 10 mm.

Turn the handle to

Turning axis

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

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.

Before Starting Measurements

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

Note

• When rack mounting the instrument, allow at least 20 mm of space around the vent holes to

prevent internal overheating.

• Make sure to have adequate support for the bottom of the instrument. However, do not block

the vent holes in the process.

IM 253421-01E

3-3

3.3 Wiring Precautions

• 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 16 “Specifications.”

Max allowable input Voltage input Current input

Instantaneous max Peak value of 2000 V or 20 A to 0.5 A range (for 1s) RMS value of 1500 V, Peak value of 150 A or RMS value of

Continuous Peak value of 1500 V or 20 A to 0.5 A range

WARNING

whichever is less. 40 A, whichever is less.

200 mA to 5 mA range

Peak value of 30 A or RMS value of 20 A, whichever is less.

RMS valueof 1000 V, Peak value of 100 A or RMS value of whichever is less. 25 A, whichever is less.

200 mA to 5 mA range

Peak value of 30 A or RMS value of 20 A, whichever is less.

• 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 + 1000 V 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 rating across the input (voltage and current) and ground varies depending on the 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 600 Vrms 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 400 Vrms max. Voltage across V terminal and ground 600 Vrms max.

3-4

IM 253421-01E

3.3 Wiring Precautions

CAUTION

Use lead wires that have sufficient margin in withstand voltage and current against the signal being measured. The lead wires must also have insulation resistance that is appropriate for the ratings. Ex. If measurement is carried out on a current of 20 A, use copper wires with a

conductor cross-sectional area of at least 4 mm

Note

• 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 3.4 and later, 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.

Before Starting Measurements

IM 253421-01E

3-5

3.4 Improving the Measurement Accuracy

SOURCE

LOAD

SOURCE

LOAD

Input terminal

WT200

By wiring the circuit to match the load, you can minimize the effect of the power loss on the measurement accuracy. We will consider a circuit consisting of a current source (SOURCE) and load resistance (LOAD) below.

• When the measurement current is relatively large

In this case, the voltage measurement circuit is connected to the load side. The current measurement circuit measures the sum of the current that flows through the load of the circuit under measurement (i voltage measurement circuit (i measurement is i

, iV is the error. The input resistance of the voltage measurement

). Since the current flowing through the circuit under

circuit is approximately 2 MΩ. For a 600-V input signal, i (600 V/2 MΩ). If the load current i 200 Ω or less), the effect of the voltage measurement circuit on the measurement accuracy is less than or equal to 0.01%. As another example, if the input signal is

200 V and 10 A, i

= 0.1 mA (200 V/ 2 MΩ). The effect on the measurement accuracy

is 0.001% (0.1 mA/10 A) in this case.

) and the current that flows through the

is approximately 0.3 mA

is greater than or equal to 3 A (load resistance is

3-6

The following figure shows the relationship between the voltage and current that leads to 0.1%, 0.01%, and 0.001% errors.

Effect or 0.1%

600

Measured voltage (V)

500 400 300 200 100

0 2 4 6 8 101214161820

300 mA 3 A

Effect of 0.01%

Less effect

• When the measurement current is relatively small

Connect the current measurement circuit to the load side. In this case, the voltage measurement circuit measures the sum of the load voltage (eL) and the voltage drop of the current measurement circuit (e

A). The voltage drop eA is the error. The input

resistance of the current measurement circuit is approximately 6 mΩ. If the load resistance is 600 Ω, for example, the effect on the measurement accuracy is approximately 0.001% (6 mΩ/600 Ω).

LOAD

SOURCE

WT200

Effect of 0.001%

Measured current (A)

IM 253421-01E

3.5 Connecting the Power Supply

Before Connecting the Power Supply

Connecting Procedure

WARNING

• Ensure that the supply voltage matches the rated supply voltage of the instrument before connecting the power cable.

• Check that the power switch is turned OFF before connecting the power cord.

• Make sure to connect the protective earth to prevent electric shock. Connect the power cord to a three-pin power outlet with a protective earth terminal.

• Do not use an extension cord without protective earth ground. This act will invalidate the protection.

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.

Item Specifications

Rated supply voltage 100 to 240 VAC Permitted supply voltage range 90 to 264 VAC Rated supply voltage frequency 50/60 Hz Permitted supply voltage frequency range 48 to 63 Hz Maximum power consumption 25 VA (at 120 VAC) or 35 VA (at 240 VAC)

Before Starting Measurements

3 pin consent

WT200

Power cord (accessory)

IM 253421-01E

3-7

3.6 Wiring the Measurement Circuit

WARNING

When applying a current to be measured directly to the input terminals of the instrument, disconnect the input cable of the external sensor. A voltage might be generated by the external sensor input terminal when connected.

CAUTION

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.

Wiring diagram

SOURCE

Input terminal

LOAD

SOURCE

± A

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.

LOADV

LOAD

3-8

IM 253421-01E

3.7 Wiring the Measurement Circuit when Using External PT/CT

WARNING

When using an external CT, do not allow the secondary side of the CT to go open-circuit while power is supplied, otherwise an extremely high voltage will be generated on the secondary side of the CT.

CAUTION

A load current flows in the thick lines shown in the diagrams; therefore, a 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 600 V, 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 20 A, connect an external current transformer (CT), and connect the secondary side of the CT to the current input terminals.

Wiring diagram when using the PT and CT

SOURCE LOAD

Before Starting Measurements

Input terminal Input terminal

Note

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

section 4.5, “Setting the Scaling Constant when External PT/CT is Used.”

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

characteristics of PT and CT.

IM 253421-01E

3-9

3.8 Wiring the Measurement Circuit when Using the External Sensor

WARNING

• Use an external sensor that is enclosed in a case which has sufficient 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 you have a thorough understanding of the specifications and handling of the voltage of the measurement circuit and the clamp sensor. Check that there are no hazards (places that may cause electric shock).

• When using the external sensor input terminal, do not touch the current input terminal or connect measurement leads. This act is dangerous, because when power is applied to the circuit under measurement (that is connected to the external sensor input terminal), the voltage of the circuit appears across the current input terminals.

• 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.

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.

In cases where the maximum current of the object under measurement exceeds 20 A, measurement becomes possible by connecting an external sensor. The range for external sensor input is either 2.5/5/10 V or 50/100/200 mV. 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.

Wiring diagram when using the external shunt

SOURCE

Connection side

OUT L

Ext. sensor input terminal (EXT)

Shunt-type current sensor

OUT H

Input terminal

(ELEMENT)

LOAD

3-10

IM 253421-01E

3.8 Wiring the Measurement Circuit when Using the External Sensor

Note

• The external sensor must be selected carefully, because the frequency and phase characteristics of the sensor affects the measured value.

• Make the lead wires between the external sensor and the instrument as short as possible to minimize measurement errors caused by stray capacitance and resistance of the lead wires.

• When using a shunt-type current sensor, note the following points when connecting the external sensor cable to minimize errors:

• Connect the shield wire of the external sensor cable to the L side of the shunt output

terminal (OUT).

• Make the area that the lead wires create between the sensor and the external sensor

cable as small as possible. This reduces the effects caused by field lines (caused by measurement current) entering this area and the external noise.

Before Starting Measurements

Shunt-type current sensor The area created by the lead wires

OUT H

OUT L

Input terminal of the WT200

External sensor cable

Shield wires

• As shown in the figure below, connect the shunt-type current sensor to the power grounding side. If you have to connect the sensor to the non-earth side, use a wire that is thicker than AWG18 (conductive cross-sectional area of approx. 1 mm2) between the sensor and the instrument to reduce the effects of common mode voltage. Take safety and error reduction in consideration when constructing an external sensor cable.

Voltage input terminal

External shunt

Current input terminal

Ext. sensor input terminal

LOAD

• If the measurement circuit is not grounded and the measured signal is of high frequency or high power, the effects of inductance of the shunt-type current sensor cable become large. In this case, use an isolation sensor (CT, DC-CT, or clamp).

Clamp sensor

Voltage input terminal

Current input terminal

Ext. sensor input terminal

LOAD

IM 253421-01E

• Make sure you have the polarities correct when making the connections. Otherwise, the polarity of the measurement current will be reversed and correct measurements cannot be made. Be especially careful when connecting the clamp type current sensor, because it is easy to reverse the polarity.

• You can use the scaling function to directly read the measured values on the display. For the procedure, see section 4.6, “Selecting the Measurement Range and Setting the Scaling Constant when External Sensor is Used (option).”

3-11

3.9 Turning the Power ON/OFF, Opening Messages

Item to be Checked before Turning ON the Power

• Check that the instrument is installed correctly (see section 3.2, “Installing the Instrument”).

• Check that the power cord is connected properly (see section 3.5, “Connecting the Power Supply”).

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 15.4, “Error Codes and Corrective Actions” , for a

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

Turning the Power OFF

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

Note

description and corrective action.

can be met.

The instrument uses a lithium battery to back up setting parameter. When the voltage level of the lithium battery falls below a certain value, an error code (see section 15.4, “Error Codes and Corrective Actions”) appears as the instrument is turned ON. 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.

3-12

IM 253421-01E

Opening Messages

Power switch ON

3.9 Turning the Power ON/OFF,Opening Messages

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

Extinguish

ABC

No display

ABC

No display

ABC

E-1

(E-2)

ABC

Before Starting Measurements

(/GPIB mode)

(/GPIB address)

(RS-232-C mode)

(RS-232-C handshake)

(RS-232-C format)

(RS-232-C baud rate)

*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.

ABC

All specs/option have

been displayed?

YES

Ready for measurement

IM 253421-01E

3-13

Chapter 4 Setting Measurement Conditions and Measurement Range

4.1 Selecting the Measurement Mode

Keys

Procedure

Explanation

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

V RANGE

RMS V MEAN DC

SHIFT

MODE

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

SHIFT

FUNCTION

V RANGE

MODE

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

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

Displays relevant keys and indicator

SHIFT

Setting Measurement Conditions and Measurement Range

V RANGE

MODE

Theoretical Equations

• RMS

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

1 T

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.

•

1 T

(t) dt

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

•DC

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

IM 253421-01E

4-1

4.1 Selecting the Measurement Mode Typical Waveform Types and Differences in Measured Values between

Measurement Modes

The WT200 does not support the mean value measurement mode in the following table.

Name

Sinewave

Half-wave

rectification

Full-wave

rectification

Direct

current

Triangular

wave

Waveform

Measurement

mode

Display

2π

RMS

value

RMS

Mean value

—

· Ep

Mean-value

rectification

V MEAN

2 2

· Ep

2 2

· Ep

4 2

Linear

averaging

· Ep

Square

wave

Pulse

2 2

4π 2

2 2

π τ

πD

· Ep

2π

D · Ep

2π

· Ep

2π

When duty D (= ) is applied.

D · Ep

· Ep

2π

D · Ep

4-2

IM 253421-01E

4.2 Selecting the Measurement Synchronization Source

Keys

Procedure

Displays relevant keys

MODE

SAMPLE

V OVER

A OVER

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

Select the measurement synchronization source.

SETUP

(Display C)

ENTER

(Display C)

ENTER

End

Setting Measurement Conditions and Measurement Range

Explanation

IM 253421-01E

Function used to select the measurement synchronization source

The instrument determines the measured value by averaging the sampled data (averaging process) over the period synchronized to the input signal period. The input signal period is detected from the voltage and current signals and you can select which signal period to use to perform the averaging process. The initial setting is A.

•A Priority is placed in detecting the current period to be used as the synchronization source. When the current input is less than 30% of the measurement range, the voltage is used as the synchronization source.

•V Priority is placed in detecting the voltage period to be used as the synchronization source. When the voltage input is less than 30% of the measurement range, the current is used as the synchronization source.

Note

• Select an input signal with stable input level and frequency (with little distortion) for the

synchronization source.

• If both the voltage and current inputs are less than 30% of the range, a fixed period of 240 ms

is used to sample and average the data.

4-3

4.3 Turning the Filter ON/OFF

Keys

Procedure

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys and indicator

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

SETUP

Select the filter

(Display C)

ENTER

(Display C)

ENTER

End

Explanation

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 cut-off frequency of 300 Hz, 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.

4-4

IM 253421-01E

4.4 Selecting the Measurement Range in case of Direct Input

Keys

Procedure

Displays relevant keys and indicator

MODE

SAMPLE

V OVER

A OVER

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

• Voltage Range Setting

V RANGE

(Display C)

ENTER

End

Setting Measurement Conditions and Measurement Range

• Current Range Setting

(Display C)

A RANGE

3.1.

ENTER

End

The unit is “A.”

The unit is “mA.”

IM 253421-01E

4-5

4.4 Selecting the Measurement Range in case of Direct Input

Explanation

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: Select from 600 V, 300 V, 150 V, 60 V, 30 V, and 15 V. Current range: Select from 20 A, 10 A, 5 A, 2 A, 1 A, 0.5 A, 200 mA, 100 mA, 50

mA, 20 mA, 10 mA, and 5 mA.

• 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.

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.

4-6

IM 253421-01E

4.4 Selecting the Measurement Range in case of Direct Input

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

The maximum display is 99999 (when the number of displayed digits is 5). When the result of “voltage range × current range” exceeds 1000 W (VA or var), the unit on the display will change to “kW (kVA or kvar)”.

Power range table

• A list of the combination of voltage and current ranges and the power range are shown below. The table shows the active power range (unit: W). The range for apparent power (unit: VA) and reactive power (unit: var) will have the same magnitude as the active power. Read the unit as VA or var for apparent power and reactive power, respectively.

• The following table shows the case when the number of displayed digits is four. When the number of displayed digits is set to five, one digit is added to the lowest digit of the values in the table. For selecting the number of displayed digits, see section 4.12.

Voltage Range

Current Range 15 V 30 V 60 V 150 V 300 V 600 V

(15.00 V) (30.00 V) (60.00 V) (150.0 V) (300.0 V) (600.0 V)

5 mA 75.00 mW 150.0 mW 300.0 mW 750.0 mW 1.500 W 3.000 W (5.000 mA)

10 mA 150.0 mW 300.0 mW 600.0 mW 1.500 W 3.000 W 6.000 W (10.00 mA)

20 mA 300.0 mW 600.0 mW 1.200 W 3.000 W 6.000 W 12.00 W (20.00 mA)

50 mA 750.0 mW 1.500 W 3.000 W 7.500 W 15.00 W 30.00 W (50.00 mA)

100 mA 1.500 W 3.000 W 6.000 W 15.00 W 30.00 W 60.00 W (100.0 mA)

200 mA 3.000 W 6.000 W 12.00 W 30.00 W 60.00 W 120.0 W (200.0 mA)

0.5 A 7.500 W 15.00 W 30.00 W 75.00 W 150.0 W 300.0 W (500.0 mA)

1 A 15.00 W 30.00 W 60.00 W 150.0 W 300.0 W 600.0 W (1.000 A)

2 A 30.00 W 60.00 W 120.0 W 300.0 W 600.0 W 1.200 kW (2.000 A)

5 A 75.00 W 150.0 W 300.0 W 750.0 W 1.500 kW 3.000 kW (5.000 A)

10 A 150.0 W 300.0 W 600.0 W 1.500 kW 3.000 kW 6.000 kW (10.00 A)

20 A 300.0 W 600.0 W 1.200 kW 3.000 kW 6.000 kW 12.00 kW (20.00 A)

Setting Measurement Conditions and Measurement Range

IM 253421-01E

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.

4-7

4.5 Setting the Scaling Constant when External PT/ CT is Used

Keys

Procedure

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys and indicator

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

• Setting the Scaling Value

SETUP

Select the scaling function.

(Display C)

ENTER

(Display C)

ENTER

Set PT ratio

(Display A)

ENTER

Set value

Move across digits

SHIFT

Shift decimal point

•

• Selecting Scaling ON/OFF

SETUP

Select the scaling function.

(Display C)

Set CT ratio

(Display B)

10.

Same as steps 6 to 8

ENTER

11.

ENTER

(Display C)

Set power coefficient

(Display C)

12.

Same as steps 6 to 8

ENTER

End

13.

ENTER

End

4-8

IM 253421-01E

Explanation

4.5 Setting the Scaling Constant when External PT/CT is Used

About the Scaling Function

This function is useful when measuring parameters such as voltage, current, and power by using an external transformer such as a potential transformer (PT) or a current transformer (CT). In this case, the output from the secondary side of the transformer is applied to the input terminals of the instrument. You can specify the PT ratio, CT ratio, or power coefficient as the scaling constant on this instrument.

Measured/computed value Scaled result

Voltage V P × V P: Voltage scaling constant (PT ratio) Current A C × A C: Current scaling constant (CT ratio) Active power W F × P × C × W F: Power scaling constant Reactive power var F × P × C × var Apparent power VA F × P × C × VA

Setting the Scaling Constant

The scaling constants are set in the following order. The setting ranges from 0.001 to

9999. 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 coefficient on display C

Setting Measurement Conditions and Measurement Range

Turning Scaling ON/OFF

Select the scaling menu once again after having set the scaling constants. 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 constant × measurement range exceeds 9999M(106), the computation over display will appear (see section 2.3).

IM 253421-01E

4-9

4.6 Selecting the Measurement Range and Setting the Scaling Constant when External Sensor is Used (option)

Keys

Procedure

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys and indicator

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

• Setting the Scaling Value of the External Sensor Input

Select the external sensor function

SETUP

(Display C)

ENTER

(Display C)

SHIFT

Set value

Move across digits

Shift decimal point

•

ENTER

End

4-10

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

A RANGE

For /EX1 option

(Display C)

ENTER

End End

For /EX2 option

(Display C)

ENTER

The unit is “mV.”The unit is “V.”

IM 253421-01E

4.6 Selecting the Measurement Range and Setting the Scaling Constant 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 connector. You set the scaling constant 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 constant Active power W E × W Reactive power var E × var Apparent power VA E × VA

Selecting the Setting Format of the Scaling Constant

The range is from 0.001 to 9999. The initial value is 50.00. The scaling constant is specified using display C.

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

After having set the scaling constants, select the menu for the current measurement range. Select the rated output of the external sensor from this menu (see 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 Measurement Conditions and Measurement Range

Setting Example of Scaling Constants for External Sensor Input

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

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

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

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

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

50 A/80 mV × 50 mV = 31.25 A: scaling constant is 31.25 However, since the setting range is 50 mV, use a setting within the 0 to 50 mV 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 constant 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 253421-01E

4-11

4.7 Using the Averaging Function

Keys

Procedure

SETUP

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

• Setting Averaging

Select the averaging function

(Display C)

SCALING AVG FILTER STORE RECALL HARMONICS

ENTER

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

(Display C)

FUNCTION

ENTER

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

Select the type

(Display B)

Displays relevant keys and indicator

CAL

ENTER

Select the

sample number

(Display C)

• Averaging ON/OFF

Select the averaging function

(Display C)

SETUP

ENTER

End

ENTER

(Display C)

ENTER

End

4-12

IM 253421-01E

Explanation

4.7 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. D

= D

+ (Mn – D

n–1

)/K

where

: the exponentially averaged value at the “n”th display;

: the exponentially averaged value at the “n–1”th display;

n–1

Mn: the measurement value at the “n”th display; K: attenuation constant

• Moving Averaging: Lin Moving averaging is expressed by the following equation. D

= (M

n–(m–1)

+ M

n–(m–2)

+ ... M

n–2

+ M

+ Mn)/m

n–1

where

: the value at the “n”th display;

M M

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

n–(m–1)

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

n–(m–2)

: M

: the measurement value at two displays before the “n”th display;

n–2

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

n–1

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

Setting Measurement Conditions and Measurement Range

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”. 8, 16, 32, 64

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 253421-01E

4-13

4.8 Using the MAX Hold Function

Keys

Procedure

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys and indicator

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

Select MAX hold function

(Display C)

ENTER

(Display C)

ENTER

End

SETUP

Explanation

4-14

MAX hold function

The maximum values (MAX) of V (voltage), A (current), W (active power), VA (apparent power), var (reactive power), Vpk (voltage peak), and Apk (current peak) can be held while the MAX hold function is enabled. The initial setting is oFF.

• on: The MAX hold function is activated.

• oFF: The MAX hold function is deactivated.

Note

The displayed values of V (voltage), A (current), W (active power), VA (apparent power), var (reactive power), Vpk (voltage peak), and Apk (current peak) while the MAX hold function is enabled will be the maximum values (MAX) that are held. The values for D/A output, output to external plotter and printer, and communication output are also set to the maximum values (MAX) that are held.

IM 253421-01E

4.9 Using the Four Arithmetical Operation Function

Keys

Procedure

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

Select the four arithmetical

operations function

SETUP

(Display C) (Display C)

4. 5

ENTER

End

ENTER

Setting Measurement Conditions and Measurement Range

IM 253421-01E

4-15

4.9 Using the Four Arithmetical Operation Function

Explanation

Four Arithmetical Operations Function

Displays the following computation results on display C. “ when the computation results are being displayed.

: A+B : A

−

: A

A, B indicates display A, B respectively.

Note

• The meanings of the displayed symbols are as follows:

: + (Addition)

−

(Subtraction)

: :

(Multiplication)

(Division)

: ^ (Exponent)

” is displayed at the front

• If the display A function is displaying INTEG TIME (elapsed time of integration), the computation result displays “- - - - - -” (no data).

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

Application Example

: Displays the result of display A × display B.

Computation example: This function is valid when display A is set to some function

other than VA (apparent power) and you wish to display VA on Display C.

Display A Display B Display C

Vrms Arms Vrms × Arms

: Displays the result of display A ÷ display B.

Computation example: The absolute value of the impedance can be computed.

Display A Display B Display C

Vrms Arms |Z|=

Vrms Arms

4-16

SOURCE

LOAD

IM 253421-01E

4.9 Using the Four Arithmetical Operation Function

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

Computation example: The impedance (Z), resistance (R), and reactance (X) can be

computed.

Display A Display B Display C

VA Arms |Z|=

W Arms R=

Var Arms |X|=

SOURCE

(Arms)

Var

(Arms)

LOAD

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

Computation example: The resistance can be computed.

Display A Display B Display C

Vrms W R=

(Vrms)

Setting Measurement Conditions and Measurement Range

SOURCE

LOAD

IM 253421-01E

4-17

4.10 Computing the Crest Factor

Keys

Procedure

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

Select the four arithmetical

operations function

(Display C)

ENTER

(Display C)

ENTER

End

SETUP

Explanation

4-18

Crest factor computation

The crest factor is determined by peak value/rms value. When displaying the crest factor, “

” is displayed at the front.

Computing equation for the crest factor and display

CF V: Displays the result of (Vpeak)/(Vrms). CF A: Displays the result of (Apeak)/(Arms).

Note

• Definition of crest factor:

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

PEAK value

RMS value

IM 253421-01E

4.11 Computing the Average Active Power during Integration

Keys

Procedure

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

Select the four arithmetical

operations function

SETUP

(Display C) (Display C)

ENTER

Setting Measurement Conditions and Measurement Range

Explanation

ENTER

End

Function used to compute the average active power during integration

This function computes the average active power within the integration period. It is derived by dividing the watt hour (integrated active power) by the elapsed time of integration.

Average active power during integration (W)

Watt hour (Wh)

Elapsed time of integration(h)

Note

This computation function is enabled during integration (while the integration is in progress or while the integration is suspended). If the integration is reset, the watt hour and the elapsed time of integration become zero, and the display shows “ - - - - -.” For details on integrator functions, see chapter 6.

IM 253421-01E

4-19

4.12 Selecting the Number of Displayed Digits

Keys

Procedure

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

Select the number of displayed digits

SETUP

(Display C)

Explanation

ENTER

(Display C)

ENTER

End

Function used to select the number of displayed digits

You can select the maximum number of displayed digits for values such as V (voltage), A (current), W (active power), VA (apparent power), var (reactive power), Vpk (voltage peak), Apk (current peak), PF (power factor), VHz (voltage frequency), AHz (current frequency), four arithmetical operation values, crest factor, and harmonic analysis values (voltage, current, and active power). The initial value is Lo.

•Hi The number of displayed digits is set to 5 (99999).

•Lo The number of displayed digits is set to 4 (9999).

Note

• The actual number of displayed digits may be smaller than the maximum number of displayed digits depending on the combination of the voltage range and current range and the automatic digit carrying operation.

• Some items such as the phase angle, integrated value, integration time, and relative harmonic content are not affected by the maximum number of displayed digits specified in this section. For details, see the sections describing each item.

4-20

IM 253421-01E

Chapter 5 Displaying the Results of the Measurement and Computation

5.1 Displaying Voltage, Current, and Active Power

Keys

Procedure

Display

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys and indicator

1. Selecting the Display Function

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

FUNCTION

VAWVA var

FUNCTION FUNCTION FUNCTION

FUNCTION FUNCTION FUNCTION FUNCTION

FUNCTION

TIME

VAWPF deg

FUNCTION FUNCTION FUNCTION FUNCTION

FUNCTION

AWV Hz A Hz Wh

& A

FUNCTIONFUNCTIONFUNCTIONFUNCTION

& V

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.

Ah±

FUNCTION

AhAh±

Displaying the Results of the Measurement and Computation

FUNCTION

Wh±

5-1IM 253421-01E

5.1 Displaying Voltage, Current, and Active Power

Explanation

Continuous Maximum Allowable Input

• Voltage Up to a peak value of 1.5 kV or RMS value of 1.0 kV, whichever is less.

• Current

• 20 A to 0.5 A range

Up to a peak value of 100 A or RMS value of 25 A, whichever is less.

• 200 mA to 5 mA range

Up to a peak value of 30 A or RMS value of 20 A, whichever is less.

• External sensor input

Up to five times the measurement range.

Maximum Reading of the Display and Units

• Maximum reading : for voltage, current and power, each 99999 (when the number of displayed digits is 5)

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

• Prefix: m, k, or 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

Note

• The measurement results may differ even on a same signal if the measurement mode is changed. For details related to the measurement mode, see section 4.1.

• The displayed values of V (voltage), A (current), and W (active power), while the MAX hold function (see section 4.8) is enabled, will be the maximum values (MAX) that are held. The values for D/A output, output to external plotter and printer, and communication output are also set to the maximum values (MAX) that are held.

5-2 IM 253421-01E

5.2 Displaying Apparent Power, Reactive Power, and Power Factor

Keys

Procedure

Explanation

Display

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys and indicator

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.

FUNCTION

VAWVA var

FUNCTION FUNCTION FUNCTION

FUNCTION FUNCTION FUNCTION FUNCTION

FUNCTION

TIME

VAWPF deg

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

Maximum Reading of the Display and Units

• Maximum reading of apparent and reactive power: 99999 (when the number of displayed digits is 5)

• Display range of power factor: –1.0000 to 1.0000 (1.0000 if the computed result between 1.0001 and 2.0000; PFErr if it is greater than 2.0000; –1.0000 if it is between –1.0001 and –2.0000; PFErr if it is less than –2.0000.)

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

• Prefix: m, k, or M

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

Displaying the Results of the Measurement and Computation

FUNCTION

Note

• Changing the measurement mode might result in different computed results, even when the input signal is the same. For details on the measurement mode, refer to section 4.1.

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

• The displayed values of VA (apparent power) and var (reactive power), while the MAX hold function (see section 4.8) is enabled, will be the maximum values (MAX) that are held. The values for D/A output, output to external plotter and printer, and communication output are also set to the maximum values (MAX) that are held.

5-3IM 253421-01E

5.3 Displaying the Phase Angle

Keys

Procedure

Explanation

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys and indicator

Selecting the Display Function

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

Display

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

FUNCTION FUNCTION FUNCTION

FUNCTION

VAWPFdeg

FUNCTION

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.

Note

• Changing the measurement mode might result in different computed results, even when the input signal is the same. For details on the measurement mode, refer to section 4.1.

• When either the voltage or current drops below 0.5% of the measurement range, dEGEr 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 is between 1.0001 and 2.0000 or between –1.0001 and –2.0000:

phase angle display is 0.0.

• When the power factor is greater than 2.0000 or less than 2.0000: phase angle display is

dEGEr.

5-4 IM 253421-01E

5.4 Displaying the Frequency

Keys

Procedure

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

STOP RESET

HARMONICS

MEMORY INTEG SET

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

Selecting the Display Function

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

Display

FUNCTION FUNCTION FUNCTION FUNCTION

AWV Hz A Hz Wh

FUNCTION

& A

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.

Ah±

HOLD

ENTER

CAL

INTEGRATOR

FUNCTION

Displays relevant keys and indicator

FUNCTION

AhAh±

Displaying the Results of the Measurement and Computation

FUNCTION

Wh±

5-5IM 253421-01E

5.4 Displaying the Frequency

Explanation

Measurement Range

Maximum Reading of the Display and Units

Selecting the Display Function

Note

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

• Maximum reading: 99999 (when the number of displayed digits is 5)

• Units: Hz

• Prefix: k

The following selections are available.

• V Hz: voltage frequency will be displayed

• A Hz: current frequency will be displayed

• 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. However, depending on the signal’s frequency and level, “ErrLo” might appear on the display. Since the filter’s cutoff frequency is 300 Hz, 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.

5-6 IM 253421-01E

5.5 Displaying Peak Value, Four Arithmetic Operation Value, and Crest Factor

Keys

Procedure

Explanation

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

STOP RESET

HARMONICS

MEMORY INTEG SET

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

Selecting the display Function

Select either

(four arithmetical operations, crest factor), (voltage peak value) or

(current peak value) by pressing the FUNCTION key.

Display

FUNCTION FUNCTION FUNCTION FUNCTION

FUNCTION

A W Wh

A HzV Hz

FUNCTIONFUNCTIONFUNCTIONFUNCTION

Ah±

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.

Displaying the peak value

is displayed first on display C followed by the value. If the unit display shows V, the

value is a voltage peak. If it shows A, the value is a current peak.

HOLD

ENTER

CAL

INTEGRATOR

FUNCTION

Displays relevant keys and indicator

FUNCTION

AhAh±

Displaying the Results of the Measurement and Computation

FUNCTION

Wh±

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

4.9 or the crest factor specified in Section 4.10 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.

Note

The displayed values of Vpk (voltage peak) and Apk (current peak), while the MAX hold function (see section 4.8) is enabled, will be the maximum values (MAX) that are held. The values for D/A output, output to external plotter and printer, and communication output are also set to the maximum values (MAX) that are held.

5-7IM 253421-01E

Chapter 6 Integration

6.1 Integrator Functions

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 elapsed time of integration. Since integrated values of negative polarity can be also displayed, the consumed watt hour (ampere hour: only when the measurement mode is DC) 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 999999 MWh/MAh, or when the integrated value of negative polarity reaches –99999 MWh/MAh;

• when the elapsed time of integration reaches the maximum of 10000 hours 00 minutes 00 seconds.

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

Integrated value

Hold

Integration

Max. integrated value (999999 MWh/MAh)

Display overflow

Elapsed time of integration

Start Stop Reset Start

Hold

Reset

Standard Integration Mode

• Integration starts: after having pressed the START key

• Integration stops:

• when the elapsed time of integration reaches the integration timer preset time;

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

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

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

Integrated value

Elapsed time of integration

Hold

IM 253421-01E

Integration timer preset time

Start Reset

6-1

6.1 Integrator Functions

Continous Integration Mode (Repeat Integration)

• Integration starts:

• after having pressed the START key;

• when the elapsed time of integration reaches the integration timer preset time, the integrated value and elapsed time of integration are reset automatically and restarted immediately.

• Integration stops:

• when the elapsed time of integration reaches the integration timer preset time ; however, the integrated value and elapsed time of integration are reset automatically and restarted immediately;

• after having pressed the STOP key;

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

• Integration holds: the elapsed time of integration 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

Hold

Integration Methods

Elapsed time of integration

Integration timer preset time

Start

Integration timer preset time

Stop

Hold

Reset

Each display update interval (250 ms) 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

4×3600

T=0

Wi: Active power between display update interval t: Elapsed time of integration

Current integration

Ai: Current value between display update interval

T=0

4×3600

t: Elapsed time of integration

6-2

IM 253421-01E

Display Resolution during Integration

The display resolution for integrated values is 100000 counts. When the integrated value reaches 100000 counts, the decimal point shifts automatically. For example, if

0.00001 mWh is added to 9.99999 mWh, the display shows “10.0000 mWh. ”

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.

6.1 Integrator Functions

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

Integration

Note

• When negative integrated values are displayed, the maximum display reading will become – 99999 MWh/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. For details, see section 6.4.

IM 253421-01E

6-3

6.2 Setting Integration Mode, Integration Type, and Integration Timer

Keys

Procedure

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys and indicator

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

• Selecting the Integration Mode

SHIFT

RESET

INTEG SET

(Display C)

2. 4.

ENTER

Select the mode

(Display C)

ENTER

End

• Setting the integration type

(Display C)

ENTER

Select type

(Display C)

ENTER

End

SHIFT

RESET

INTEG SET

6-4

• Setting the Integration Timer

SHIFT

RESET

INTEG SET

Minute

(Display B)

Same as steps 4 and 5

(Display C)

ENTER

Second

(Display C)

10.

Same as steps 4 and 5

11.

Hour

(Display A)

Set value

SHIFT

12.

ENTER

End

ENTER

Move across digits

IM 253421-01E

Explanation

6.2 Setting Integration Mode, Integration Type, and Integration Timer

Selecting the Integration 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.

Selecting the Integration Type

The following selections are available. The initial value is St.

• St: Standard type. Integrates the active power or current that is obtained using the normal measurement method, which obtains the active power or current from the sampled data over the period that is synchronized to the input signal. Select the standard type for steady-state input signals that have a constant period such as a sinusoid.

• Ad: Advanced type. Integrates the active power or current obtained over a fixed period of sampled data, irrespective of the period of the input signal. Select the advanced type for intermittent signals with a frequency of 50 or 60 Hz.

Note

Select integration type Ad when integrating the power of devices that are controlled through intermittent signals or devices on which the amplitude of the voltage or current changes drastically. If the load fluctuation is large, the value obtained on this instrument may differ from that obtained on other instruments using a different integration method.

Integration

Selecting the Integration Timer

Specify how many hours, minutes, and seconds to perform the integration. The selectable range is from 0.00.00 (0 hours 0 minutes 0 seconds) to 10000.00.00 (10000 hours, 0 minutes, 0 seconds). The initial value is 0.00.00.

• 0.00.00: When nor is selected in the integration mode menu, integration is performed in the manual integration mode. If Cont is selected, an error code is displayed and the integration is not performed.

• 0.00.01 to 10000.00.00: The time during which integration is to be performed when using the standard or continuous integration mode. The standard or continuous integration mode is specified in the integration mode menu.

IM 253421-01E

6-5

6.3 Displaying Integrated Values

Keys

Procedure

Display

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys and indicator

1. Selecting the Display Function

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

FUNCTION

V A W VA var

FUNCTION FUNCTION FUNCTION FUNCTION

FUNCTION

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.

. (average active power during integration).

FUNCTION FUNCTION FUNCTION FUNCTION

TIME

FUNCTION

A W V Hz A Hz Wh

FUNCTIONFUNCTIONFUNCTIONFUNCTION

Ah±

FUNCTION

AhAh±

Wh±

2. Starting Integration

Press the START key. The START indicator lights, the integrated value appears on display C, and the elapsed time of integration appears on display A.

is displayed first on display C. It is followed by the average active power during integration, if the function is specified in the computation settings (see section 4.11).

START

3. Holding Integration

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

HOLD

4. Cancelling HOLD, and Updating the Integration

Press the HOLD key while the values are held. The HOLD indicator turns off, and the display values are updated. You can also update the display by activating a trigger (press the SHIFT key followed by the HOLD (TRIG) key) while the values are held.

HOLD

TRIG

6-6

IM 253421-01E

Explanation

6.3 Displaying Integrated Values

5. Stopping Integration

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

STOP

6. Resetting Integration

Press the RESET key. The STOP indicator will extinguish and the values on display A will be reset to 0.00.00.

RESET

Maximum Reading of the Display and Units

Maximum reading

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

• Elapsed time of integration: 10000

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

• Prefix: m, k, or M

Selecting the Display Function

The following selections are available.

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

•Wh±: displays the positive and negative watt hour values separately

• Ah: displays the total ampere hour values

•Ah±: displays the total ampere hour values, or the positive and negative ampere hour values separataly

•

: The average active power during integration is displayed, if the function is

specified in the computation settings (see section 4.11).

Integration

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 section.

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 section.

Display in case of Integration Over

When the maximum integration value has been reached (999999 MWh/MAh or –99999 MWh/MAh), integration will stop and that result will be held on the display. When the maximum integration time has been reached (up to 10000 hrs), integration will stop and that result will be held on the display.

IM 253421-01E

6-7

6.3 Displaying Integrated Values

Note

• The maximum number of digits used to display the elapsed time of integration is nine (when the hour, minute, and second digits are added together). The WT200 displays the elapsed time of integration on display A. However, because the maximum number of digits that can be displayed on display A is five, all the digits of the elapsed time of integration may not be displayed in certain cases. Therefore, the number of digits that are displayed varies depending on the elapsed time of integration as follows:

• For details related to Wh, Wh±, Ah, and Ah±, see page 6-3. For details related to the average active power during integration, see section 4.11.

• The displayed values of V (voltage), A (current), W (active power), VA (apparent power), var (reactive power), Vpk (voltage peak), and Apk (current peak), while the MAX hold function (see section 4.8) is enabled, will be the maximum values (MAX) that are held. The values for D/A output, output to external plotter and printer, and communication output are also set to the maximum values (MAX) that are held. The integrated value is determined and displayed by summing the value that is measured at every display update rate, irrespective of the MAX hold function.

Elapsed Time of Integration Display on Display A Display Resolution 0 to 9 hours 59 minutes 59 seconds 0.00.00 to 9.59.59 1 s 10 hours to 99 hours 59 minutes 59 seconds 10.00.0 to 99.59.5 10 s 100 hours to 999 hours 59 minutes 59 seconds 100.00 to 999.59 1 min 1000 hours to 9999 hours 59 minutes 59 seconds 1000.0 to 9999.5 10 min 10000 hours 10000 1 hour

6-8

IM 253421-01E

6.4 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)

Elapsed time of integration

Integration

START

STOP 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)

Elapsed time of integration

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.

Reset

Restart

Integration timer preset time

Integrated value

Start

Interrupt

Restart

Auto stop Reset

IM 253421-01E

Elapsed time of integration

START STOP START STOP RESET START RESET

6-9

6.4 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 elapsed time of integration 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

Measurement mode

Measurement synchronization source

Filter Measurement range Scaling Averaging

MAX hold Display function

Number of displayed digits Hold Trigger

Integration reset

Not lit Not lit

yes yes yes yes yes yes yes yes yes

yes yes

Integration status Integration in

progress Lit

Not lit

no no no no yes no yes yes yes

yes yes

Integration interrupted

Not lit Lit

no no no no yes no yes yes yes

yes yes

Integration mode

Integration type

Integration timer

Integration start Integration stop Integration reset

Harmonic analysis function (option) Store/recall Comparator Plotter and printer Zero level compensation

yes

yes no yes

yes yes yes yes yes

Settings cannot be changed, but can be displayed

no yes no

no no (

Store possible)

yes yes no

yes no yes

Store possible)

no ( yes yes no

• yes: Settings can be changed

•no: 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.

6-10

IM 253421-01E

Chapter 7 Using the Harmonic Analysis Function (Optional)

7.1 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. 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

Display

FUNCTION

VAW 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:

FUNCTION

V A W V Hz

: 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

FUNCTION

W%Vdeg A% V%

FUNCTION FUNCTION

A Hz

Using the Harmonic Analysis Function (Optional)

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

Auto Range Operation

Display Renewal Rate

IM 253421-01E

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)

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.

7-1

7.1 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

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:

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

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

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

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.

The measurement range of the fundamental frequency of the harmonic analysis function is different from the frequency measurement range of normal measurement. For details, see chapter 16, “Specifications.”

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

• 200% of the rated range for voltage ranges except 600 V, or current ranges except 20 A

the upper limit, after having set the order at display A;

display A is set to 1;

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

7-2

IM 253421-01E

7.2 Setting the PLL Source and Harmonic Distortion Method

Keys

Procedure

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys and indicator

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

• Setting the PLL source

SHIFT

START

HARMONICS

(Display C)

ENTER

Set the PLL source

(Display C)

ENTER

End

Using the Harmonic Analysis Function (Optional)

• Setting the Computation Method of the Harmonic Distortion

SHIFT

START

HARMONICS

(Display C)

Set the computation method

ENTER

(Display C)

ENTER

End

IM 253421-01E

7-3

7.2 Setting the PLL Source and Harmonic Distortion Method

Explanation

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 as the PLL source.

• A1: Sets the current 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 300 Hz 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

(Ck)

k=1

input set as the PLL source. For details, see chapter 16, “Specifications.”

7-4

IM 253421-01E

7.3 Switching the Harmonic Analysis Function ON/OFF

Keys

Procedure

Explanation

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys and indicator

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

• Turning the Harmonic Analysis Function ON/OFF

(Display C)

ENTER

End

SHIFT

START

HARMONICS

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.

Using the Harmonic Analysis Function (Optional)

IM 253421-01E

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 (see page 6-10).

7-5

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

Keys

Procedure

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

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

Setting the Harmonics Order

1. Turn off the display function indicator of display A.

Display

Display function turns off

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

FUNCTION FUNCTION FUNCTION

2. Set the harmonics order.

(Display A)

Displays relevant keys and indicator

FUNCTION

Displaying the Values of Harmonic Analysis

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

Display

FUNCTION

VAW PF

FUNCTION FUNCTIONFUNCTIONFUNCTIONFUNCTION

Adeg

Display

FUNCTION

V A W V Hz

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

FUNCTION

V% A%

W%Vdeg A% V%

FUNCTION FUNCTION

A Hz

7-6

IM 253421-01E

Explanation

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

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 50 Hz, up to 50 orders can be displayed;

• When the fundamental frequency is 400 Hz, up to 30 orders can be displayed. When an order is set exceeding the maximum order, display B will change to the dot display. For details related to the upper limit of the order of analysis, see chapter 16, “Specifications.”

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; See section 7.2 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; See section 7.2 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: When 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. When 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: When the fundamental (1st order) is shown on display A Shows the same as in case of V deg. When 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 253421-01E

7-7

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

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;

Computation Equation

(Vk)

(Ak)

k=1

k=1 n

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 input set as the PLL source. For details, see

chapter 16, “Specifications.”

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, see section 7.2. 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 440 Hz. However, depending on internal timing, there are cases where measurements in the 20 to 700 Hz 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.

Note

• A bar display appears if you select a display function that is not being analyzed or measured.

• 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.

7-8

IM 253421-01E

Chapter 8 Storing/Recalling Measured Data and Setting Parameters from the Internal Memory

8.1 Storing/Recalling Measured Data

Keys

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

Procedure

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

• Setting the Storage Interval for Measurement Data

Select the store function

(Display C)

ENTER

SHIFT

STOP

MEMORY

• Storage of Measurement Data ON/OFF

SHIFT

STOP

MEMORY

Select the store function

(Display C)

ENTER

mV kA MW

mV PF kA MW

mV Hz kA h MW h

FUNCTION

var

TIME

FUNCTION

deg

FUNCTION

(Display C)

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

ENTER

End

CAL

Set interval

(Display C)

hour min

SHIFT

Displays relevant keys and indicator

sec

Up/down

Shift cursor

ENTER

End

Storing/Recalling Measured Data and

Setting Parameters from the Internal Memory

IM 253421-01E

• Setting the Recall Interval for Measurement Data

SHIFT

STOP

MEMORY

Select the recall function

(Display C)

ENTER

• Recalling Measurement Data ON/OFF

Select the recall function

(Display C)

ENTER

SHIFT

STOP

MEMORY

(Display C)

ENTER

End

Set Interval

(Display C)

hour min

Up/down

SHIFT

sec

Shift cursor

ENTER

End

8-1

8.1 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.

During Normal Measurement During Harmonic Analysis

600 blocks 30 blocks

Items which can be stored

All the data that are obtained while the display is updated once are stored as one block of data. 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 * When either the V Hz or A Hz display function is lit, the frequency of that

• When storing harmonic analysis data (harmonic analysis function is turned ON) Normal measurement data are not stored. All analyzed data are stored.

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.

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 (0 hrs, 0 min, 0 sec) to 99.59.59 (99 hrs, 59 min, 59 sec)

• Initial value: 00.00.00

When the setting is 00.00.00, the interval will become 250 ms.

• When storing harmonic analysis data (harmonic analysis function is turned ON)

• Setting range: 00.00.00 (0 hrs, 0 min, 0 sec) to 99.59.59 (99 hrs, 59 min, 59 sec)

• 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 6 s; from 00.00.07 to

00.00.09, the interval will become 9 s; in other cases, the set interval will be valid.

Note

The displayed values of V (voltage), A (current), W (active power), VA (apparent power), var (reactive power), Vpk (voltage peak), and Apk (current peak), while the MAX hold function (see section 4.8) is enabled, will be the maximum values (MAX) that are held. The values for D/A output, output to external plotter and printer, and communication output are also set to the maximum values (MAX) that are held. The measured data that are stored are values that are measured at every display update rate, irrespective of the MAX hold function.

8-2

IM 253421-01E

8.1 Storing/Recalling Measured Data

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

0.00.00 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.

Storing/Recalling Measured Data and

Setting Parameters from the Internal Memory

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 (0 hrs, 0 min, 0 sec) to 99.59.59 (99 hrs, 59 min, 59 sec) Initial value: 00.00.00 When recalling normal measured data, the interval will become 250 ms when the setting is 00.00.00. When recalling harmonic analysis data, the interval will become 1s when the setting is

00.00.00.

IM 253421-01E

8-3

8.1 Storing/Recalling Measured Data

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 and range* will become as those of the data being recalled. After recalling finishes, the original measurement conditions will return. * Measurement range, measurement mode, filter ON/OFF, scaling ON/OFF, scaling

constants, averaging ON/OFF, averaging mode, averaging constants, integration mode, integration type, integration time, harmonic analysis function ON/OFF, PLL source, computation method of harmonic distortion factor, etc.

• 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.

8-4

IM 253421-01E

8.2 Storing/Recalling Setting Parameters

Keys

Procedure

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys and indicator

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

• Storing Setting Parameters

SHIFT

Select storage of setting parameters

(Display C)

STOP

MEMORY

ENTER

Select file for storage

(Display B)

ENTER

End

Storing/Recalling Measured Data and

Setting Parameters from the Internal Memory

• Recalling Setting Parameters

SHIFT

Select recalling of setting parameters

(Display C)

STOP

MEMORY

ENTER

When setting 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 setting parameters are stored to a file, display C will show " " When no data are stored yet, display C will show " "

IM 253421-01E

8-5

8.2 Storing/Recalling Setting Parameters

Explanation

Storing Setting Parameters

Stores the current setting 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. Setting parameters are saved in another internal memory than measured data. Saved setting parameters are backed up by the lithium battery in the same way as measured data.

Recalling Setting Parameters

When setting parameters are being retrieved, all setting parameters are being set accordingly. After that, measurements can be carried out.

8-6

IM 253421-01E

Chapter 9 Using External Input/Output

9.1 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

112

24 13

(Rear panel)

Pin Assignment

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)

Remote control: input circuit

+5 V

10 kΩ

TTL level

100 Ω

0.01 µF

: 0 to 0.8 V

: 2.0 to 5 V

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)

Remote control: output circuit

+5 V

100 Ω

TTL level

: 0 to 0.4 V(8 mA)

: 2.4 to 5 V(–400 µA)

WARNING

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.

Using External Input/Output

IM 253421-01E

9-1

9.2 Remote Control (optional)

Controlling Integration

To control integration, apply timing signals according to the timing chart below.

StopStart Reset StopStart

5 ms min.

EXT START

5 ms min.

EXT STOP

EXT RESET

INTEG BUSY

Holding Display Data Update (same function as HOLD key)

Approx. 15 ms

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. 15 ms

5 ms

Approx. 15 ms

To hold the display update, apply the

EXT. HOLD

EXT. HOLD signal according to the timing chart below.

Display hold

5 ms 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

250 ms min.

EXT. TRIG

⋅Update timing while harmonic analysis function is in progress

Measurement start

EXT. TRIG

Display update

5 ms min.

3 s min.

5 ms min.

Display update

5 ms min.

9-2

CAUTION

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.

IM 253421-01E

9.3 D/A Output (optional)

Keys

Procedure

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

• Setting D/A Output

SETUP

SHIFT

OUTPUT

Select D/A output function

(Display C)

mV kA MW

mV PF kA MW

mV Hz kA h MW h

ENTER

var

TIME

deg

FUNCTION

AUTO

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

Select output format

(Display C)

AUTO

A RANGEV RANGE

HOLD

ENTER

CAL

INTEGRATOR

STOP RESET

MEMORY INTEG SET

ENTER

End

(Select default setting)

Displays relevant keys and indicator

Using External Input/Output

6.,10.

Select

output channel

(Display B)

ENTER

11.

ENTER

End

Select output item

(Display C)

(Select desired item)

ENTER

When you press the key in step 9, the output channel displayed on display B changes to the next channel (from ch1 to ch2, for example).

ENTER

IM 253421-01E

9-3

9.3 D/A Output (optional)

• Setting Preset Integration Time

SHIFT

Select preset integration time

RESET

INTEG SET

(Display C)

ENTER

Hour

(Display A)

Set value

SHIFT

ENTER

Move across digits

Explanation

Minute

(Display B)

Same as steps 4 and 5

ENTER

Second

(Display C)

10.

Same as steps 4 and 5

11.

12.

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.

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.

Output Channel

ch1 ch2 ch3 ch4

* If either one of the display functions, V Hz or A Hz, is turned on, the frequency of the

corresponding function is output. If both functions are turned OFF, the frequency of the function that was lighted last will be output.

Output Item

V A W

• 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.

Output Channel

ch1 ch2 ch3 ch4

* If either one of the display functions, V Hz or A Hz, is turned on, the frequency of the

corresponding function is output. If both functions are turned OFF, the frequency of the function that was lighted last will be output.

Output Item

W Wh Ah

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 is 4. You can select the channel that will output each item.

• Setting the output item (corresponds to column A in the procedure)

The output item 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)*1, Ph (total Watt-hour Wh), Ah (total Ampere-hour), dEG (phase angle), VP(peak value of voltage), AP(peak value of current), MATH(computation), Ph+ (positive watt hour value Wh+), Ph– (negative watt hour value Wh–), Ah+ (positive ampere hour value

value

), Ah– (negative ampere hour

– – – – (D/A output 0 V; no further elements can be set)

9-4

*1 If either one of the display functions, V Hz or A Hz, is turned on, the frequency of the

corresponding function is output. If both functions are turned OFF, the frequency of the function that was lighted last will be output.

*2 For details concerning the positive value of the ampere hour, see page 6-3.

IM 253421-01E

9.3 D/A Output (optional)

Setting the Integration Preset Time

The D/A output of integrated values will be 5.0 V FS when the rated range has been input consequently during the preset integration time (rated integration time). Setting range: 0.00.00 (0 hrs 0 min 0 sec) to 10000.00.00 (10000 hrs 0 min 0 sec) The initial value is 1.00. When 0.00.00 is set, the D/A output value will be 0 V.

Note

• The D/A output of each output item is adjusted so that 5.0 V is output when the value corresponding to the range rating of the voltage, current, or power is applied.

• Even when scaling constants for voltage, current, and power are specified, the D/A output is adjusted so that 5.0 V is output when the value corresponding to the range rating is applied.

• When (computation) is specified, the D/A output is 0 V.

Using External Input/Output

IM 253421-01E

9-5

9.3 D/A Output (optional)

Relation between the output item and the D/A output voltage

• Frequency

D/A output

Approx. 7.5 V

5.0 V

2.5 V

0.5 V

0.2 V 10

100

1 k

10 k

50 k

• Integrated value

D/A output

Approx. 7.0 V

5.0 V

In case of 140% of rated value input

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 . 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. 7.0 V

5.0 V 0 V –5.0 V Approx. –7.0 V

In case of rated value input

Approx. 7.5 V Approx. 7.0 V

–140

–100

to:rated integration time

D/A output

5.0 V

–5.0 V Approx. –7.0 V

Approx. –7.5 V

Time

100 140

Displayed value[%]

9-6

IM 253421-01E

9.4 Comparator Function (optional)

When the instrument is equipped with option /CMP you can compare the measured, computed, integrated, and 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 (4ch) 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 capacity: rated 24 V/0.5 A (max. 30 V/0.5 A)

• Minimum load: 10 mV/10 µA

• Electric switching life: approx. 500000 times (at contact rating)

• Mechanical life: approx. one hundred million times

• Contact Response time: less than 500 ms

Note

Since this relay is subject to wear, it is excluded from the 3-year warranty.

Comparator Mode

CAUTION

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. See the figure below.

When the current value is less than 3 A: NO-GO will be determined and the circuit becomes open. When the current value is 3 A or more: GO will be determined and the circuit becomes closed.

Current

3 A

Limit of ch2 is set to 3 A

NO-GO determination area

Time

Below limit ⇒ open status

24 V

COM

Using External Input/Output

ch 2

IM 253421-01E

Current

3 A

GO determination area

Limit of ch2 is set to 3 A

Time

Exceeding limit ⇒ closed status

24 V

COM

ch 2

9-7

9.4 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 1 A, but is less then 3 A: GO will be ditermined and the circuit becomes closed. When the current value lies below 1 A, or exceeds3 A:NO-GO will be determined and the circuit becomes open.

Current

Upper limit(Hi)

3 A

Lower limit(Lo)

1 A

Current

Upper limit(Hi)

3 A

1 A

Lower limit(Lo)

Limit of ch1 is set to 3 A

Limit of ch2 is set to 1 A

NO-GO determination area

Time

Limit of ch1 is set to 3 A

GO determination area

Limit of ch2 is set to 1 A

Time

Below lower limit ⇒ open circuit

24 V

Exceeding lower limit, below upper ⇒ closed circuit

24 V

COM

NC NO

COM

ch 1

ch 2

ch 1

ch 2

Exceeding upper

Current

Upper limit(Hi)

3 A

1 A

Lower limit(Lo)

NO-GO determination area

Limit of ch1 is set to 3 A

Limit of ch2 is set to 1 A

Time

limit ⇒ open circuit

24 V

COM

NC NO

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.

• The values of V (voltage), A (current), W (active power), VA (apparent power), var (reactive power), Vpk (voltage peak), and Apk (current peak), while the MAX hold function (see section

4.8) is enabled, will be displayed according to the maximum values (MAX) that are held. The values that are compared against the limit values are also the maximum values (MAX) that are held.

NC NO

COM

ch 1

ch 2

9-8

IM 253421-01E

9.4 Comparator Function (optional)

CAUTION

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

FrqEr (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.

Using External Input/Output

IM 253421-01E

9-9

9.5 Setting the Comparator Mode (optional)

Keys

Procedure

SHIFT

SETUP

OUTPUT

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

CAL

Displays relevant keys and indicator

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

Select the comparator function

(Display C)

ENTER

(Display C)

ENTER

Select the mode

(Display C)

ENTER

End

Explanation

Setting the Comparator Mode

The following two settings are available. For details related to the mode, see section

9.4. 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 (See section

9.6 and the following sections), the situation will change as follows. Also verify the comparator limits again.

• When you change the mode to dual mode after setting the limits in the single mode, the limit item (see section 9.6) for ch2 and ch4 are set to those for ch1 and ch3, respectively. When the mode is set back to the single mode, the limit item of each channel returns to its original value.

CAUTION

Do not change the comparator mode, measurement mode or harmonic analysis ON/OFF, while the comparator function is turned ON (see section 9.8). Similar to the Note above, changing the limit item might result in unexpected statuses of the output relay.

9-10

IM 253421-01E

9.6 Setting the Comparator Limit Values (optional)

Keys

SAMPLE

V OVER

A OVER

MODE

RMS

V MEAN

SCALING AVG FILTER STORE RECALL HARMONICS

var

TIME

MW mV PF

deg

kA MW

mV Hz kA h MW h

FUNCTION

Procedure

• Operate the instrument by following the thick lines in the menu below.

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

• To leave the current menu in the middle of the operation, press the key indicated in step 1. The confirmed settings up to that point are kept.

• Setting the Comparator Limit Values in case of Normal Measurement

SHIFT

Select the comparator function

SETUP

OUTPUT

(Display C)

ENTER

(Display C)

AUTO

A RANGEV RANGE

MODE TRIGMAX HOLD

START

HARMONICS

REMOTE

LOCAL SETUP

INTERFACE OUTPUT SHIFT

HOLD

ENTER

INTEGRATOR

STOP RESET

MEMORY INTEG SET

Displays relevant keys and indicator

CAL

Using External Input/Output

6.,16.

Relay setting

(Display C)

ENTER

17.

ENTER

End

Set limit item

(Display A)

ENTER

10. Up/down

Set limit value

(Display B)

13.

ENTER

Set exponent

(Display C)

14.

11. Shift cursor

SHIFT

12. Shift decimal

SHIFT

* When you press the key in step 15, the output channel displayed

on display C changes to the next channel (from ch1 to ch2, for example).

point

•

ENTER

15.

ENTER

IM 253421-01E

9-11

9.6 Setting the Comparator Limit Values (optional)

• Setting the Comparator Limit Values in case of Harmonic Anaiysis

SHIFT

Select the comparator function

SETUP

OUTPUT

(Display C)

6.,18.

Relay setting

(Display C)

ENTER

Set limit item

(Display A)

SHIFT

10.

ENTER

11.

ENTER

Sets the A column

Moves to the B column

Select from 1 to 3

(Display C)

Set limit value

(Display B)

12.

13.

SHIFT

14.

point

SHIFT

*1 When you press the key in step 17, the output channel displayed on display C changes to the next channel (from ch1 to ch2, for example). *2 Because the maximum order of harmonic analysis varies depending on the fundamental frequency, the analysis data may not be available up to 50th order (bar display) in some cases. In this case, comparison will not be performed even if the limit value is specified. *3 The first digit of the limit value is used to display the sign. Select “–” to set a negative limit value. Select no sign to set a positive value.

Up/down

Shift cursor

Shift decimal

•

ENTER

15.

ENTER

Set exponent

16.

ENTER

(Display C)

17.

ENTER

9-12

19.

ENTER

End

IM 253421-01E

Explanation

9.6 Setting the Comparator Limit Values (optional)

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 limit item and its value will be set.

• Setting the limit item

The following sections are available. When the comparator mode is dual, ch1&ch2 and ch3&ch4 are pairs and the same limit item 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)

), Ah– (negative ampere hour value*2),

– – – – (no data)

*1 If either one of the display functions, V Hz or A Hz, is turned on, the frequency of

the corresponding function is output. If both functions are turned OFF, the frequency of the function that was lighted last will be output.

*2 For details related to the positive and negative directions of the ampere hour, see page

6-3.

• Setting the limit value

Setting range: 0.000 to ±9999 Initial setting: The limit item: limit value: exponent of the limit value (see next section) are initialized for each channel. ch1 : V1 : 600.0 : E+0 (set 600 V of voltage to ch1) ch2 : A1 : 20.00 : E+0 (set 20.00 A of current to ch2) ch3 : P1 : 1.200 : E+3 (set 1.2 kW of active power to ch3) ch4 : PF1 : 1.000 : E+0 (set a power factor of 1 to ch4)

• Setting the exponent

The following selections are available. The initial value is as described above. E–3 (10

–3

), E+0 (100), E+3 (103), E+6 (106)

Using External Input/Output

IM 253421-01E

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 limit item and its value will be set.

• Setting the limit item(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 limit item 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 the meanings of the harmonic analysis values, see chapter 7, “Using the Harmonic

Analysis Function (Optional).”

9-13

YOKOGAWA WT200 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Checking the Contents of the Package

Safety Precautions

Structure of this Manual

Conventions Used in this Manual

Contents

Chapter 1 Functional Overview and Digital Display

1.1 System Configuration and Block Diagram

1.2 Functions

1.3 Digital Numbers/Characters, and Initial Menus

Chapter 2 Names and Uses of Parts and the Overrange and Error Displays

2.1 Front Panel, Rear Panel and Top View

2.2 Operation Keys and Function Display

2.3 Displays in case of Overrange/Error during Measurement

Chapter 3 Before Starting Measurements

3.1 Usage Precautions

3.2 Installing the Instrument

3.3 Wiring Precautions

3.4 Improving the Measurement Accuracy

3.5 Connecting the Power Supply

3.6 Wiring the Measurement Circuit

3.7 Wiring the Measurement Circuit when Using External PT/CT

3.8 Wiring the Measurement Circuit when Using the External Sensor

3.9 Turning the Power ON/OFF, Opening Messages

Chapter 4 Setting Measurement Conditions and Measurement Range

4.1 Selecting the Measurement Mode

4.2 Selecting the Measurement Synchronization Source

4.3 Turning the Filter ON/OFF

4.4 Selecting the Measurement Range in case of Direct Input

4.5 Setting the Scaling Constant when External PT/ CT is Used

4.6 Selecting the Measurement Range and Setting the Scaling Constant when External Sensor is Used (option)

4.7 Using the Averaging Function

4.8 Using the MAX Hold Function

4.9 Using the Four Arithmetical Operation Function

4.10 Computing the Crest Factor

4.11 Computing the Average Active Power during Integration

4.12 Selecting the Number of Displayed Digits

Chapter 5 Displaying the Results of the Measurement and Computation

5.1 Displaying Voltage, Current, and Active Power

5.2 Displaying Apparent Power, Reactive Power, and Power Factor

5.3 Displaying the Phase Angle

5.4 Displaying the Frequency

5.5 Displaying Peak Value, Four Arithmetic Operation Value, and Crest Factor

Chapter 6 Integration

6.1 Integrator Functions

6.2 Setting Integration Mode, Integration Type, and Integration Timer

6.3 Displaying Integrated Values

6.4 Precautions Regarding Use of Integrator Function

Chapter 7 Using the Harmonic Analysis Function (Optional)

7.1 Harmonic Analysis Function

7.2 Setting the PLL Source and Harmonic Distortion Method

7.3 Switching the Harmonic Analysis Function ON/OFF

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

Chapter 8 Storing/Recalling Measured Data and Setting Parameters from the Internal Memory

8.1 Storing/Recalling Measured Data

8.2 Storing/Recalling Setting Parameters

Chapter 9 Using External Input/Output

9.1 Remote Control and D/A Output Connector (optional)

9.2 Remote Control (optional)

9.3 D/A Output (optional)

9.4 Comparator Function (optional)

9.5 Setting the Comparator Mode (optional)

9.6 Setting the Comparator Limit Values (optional)