Hioki 3331 Instruction Manual

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Instruction Manual

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3331

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POWER HiTESTER

June 2011 Revised edition 10 3331A981-10 11-06H

Contents

Introduction Inspection Safety Notes Notes on Use

Chapter 1 Overview 1

1.1 Product Overview

1.2 Features

1.3 Principles of the Two-Power Method of Power Measurement and V3and I

1.4 Identification of Controls and Indicators

1.5 Explanation for Keys

1.6 Display Reference

1.7 Handle and Stand Operations

Measurement

iii

1 2

3 4 5 7

Chapter 2 Preparation for Measurement 11

2.1 Before Measurement

2.2 Simple Use

2.3 Making the Connections

2.3.1 Direct Connections 14

2.3.2 When Using PT or CT 16

2.3.3 Notes on Connection Methods 17

2.4 Powering On

2.5 Self Test

11 13 14

18 19

Chapter 3 Basic Operation 21

3.1 Selecting the Connection Mode

3.2 Changing the Response Setting

3.3 Selecting the Rectifier Type

3.4 Selecting the Display

3.5 Selecting the Range

21 23 24 25 27

3.6 Holding the Display

3.6.1 Restrictions During the Hold Status 29

3.6.2 Current Waveform Peak Hold Function and Maximum Value Measurement 30

3.6.3 Restrictions During the Peak Hold Status 31

Chapter 4 Settings and Operations 33

4.1 Setting Items

4.2 Operating Setup Keys

4.3 Setting the Integration

4.3.1 Flowchart 35

4.3.2 Integration Setting Method 35

4.3.3 Integration Operation 36

4.3.4 Notes on Integration 37

4.3.5 Display Format of Integrating Value 40

4.4 Setting the Number of Averaging

4.4.1 Flowchart 41

4.4.2 Average Setting Method 41

4.5 Setting the Frequency

4.5.1 Flowchart 43

4.5.2 Frequency Setting Method 43

4.6 Setting the D/A Output

4.6.1 Flowchart 45

4.6.2 D/A Output Setting Method 45

33 34 35

4.7 Setting the PT (Voltage Transformer) and CT (Current Transformer) Ratios

4.7.1 Flowchart 49

4.7.2 PT and CT Ratios Setting 49

4.8 Setting the Printer Output

4.8.1 Flowchart 51

4.8.2 Printer Output Setting Method 51

4.8.3 Connecting to the Printer 54

4.9 Setting the Interface

4.9.1 Flowchart 55

4.9.2 Interface Setting 55

Chapter 5 Setting and Measurement Example 59

5.1 Electrical Power Integration and Printer Output Examples

5.2 PT and CT Setting

Moving the Decimal Point)

(Examples of Changing the Digits and

Chapter 6 Other Functions 67

6.1 When Power Fails

6.2 System Resetting

6.3 Error Indications

6.4 Changing the Power Calculation Circuit Clock Frequency

6.5 Key Lock State

67 68 69 70 71

Chapter 7 External Control Terminal and Output Terminal 73

7.1 Connector Pin Assignment

7.2 Output Terminal

7.3 External Control Terminal

7.4 Making the Connections

73 75 76 78

Chapter 8 GP-IB･RS-232C Interface 79

8.1 Specifications

8.1.1 GP-IB Interface 79

8.1.2 RS-232C Interface 80

8.2 Identification of Controls and Indicators

8.3 Interface Outline

8.3.1 Features 84

8.3.2 Messages 84

8.3.3 Command Syntax 85

8.3.4 Headers 85

8.3.5 Message Terminators 86

8.3.6 Separators 86

8.3.7 Data Formats 87

8.3.8 Abbreviation of Compound Commands 87

8.3.9 Output Queue 88

8.3.10 Input Buffer 89

8.3.11 Status Model 89

8.3.12 Status Byte Register 90

8.3.13 Event Registers 91

8.3.14 GP-IB Commands 96

8.4 Command Reference

83 84

8.4.1 Standard Commands 98

8.4.2 Commands Specific to the 3331 106

8.5 Command Summary

8.5.1 Standard Commands 149

8.5.2 Commands Specific to the 3331 150

8.5.3 Valid Command According to Condition (Standard Command) 153

8.5.4 Valid Commands According to Condition (Specific Command) 154

8.5.5 Execution Time of GP-IB Interface Command 157

8.5.6 Initialization 158

8.5.7 Specific Command Tree 159

149

8.6 Sample Programs

8.6.1 GP-IB 161

8.6.2 RS-232C 162

8.7 Printer Output Function

8.7.1 Printer Mode Function 163

8.7.2 Type of Printing 163

8.7.3 Selecting Printing Items and Setting Printing Interval Time 164

8.7.4 Printer Output Buffer 164

8.7.5 Printing in Power Cut 164

8.7.6 Printing Example 165

8.8 Device Compliance Statement

8.9 Notes on Interface

8.9.1 GPｰIB Troubleshooting 172

8.9.2 RS-232C Troubleshooting 174

161

163

170 172

Chapter 9 Maintenance and Service 175

9.1 Disposing

9.2 Cleaning and Storing of the Unit

175 176

Chapter 10 Rack Mounting 177

10.1 Making Rack Mounting Fittings

10.2 Installation Procedures

177 180

Chapter 11 Specifications 183

11.1 General Specifications

11.2 Standard Specifications

11.3 Function Specifications

183 185 189

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Introduction

Thank you for purchasing this HIOKI "3331 POWER HiTESTER." To get the maximum performance from the unit, please read this manual first, and keep this at hand.

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Introduction

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Inspection

When the unit is delivered, check and make sure that it has not been damaged in transit. In particular, check the accessories, panel switches, and connectors. If the unit is damaged, or fails to operate according to the specifications, contact your dealer or HIOKI representative.

■ Standard accessories

Instruction Manual 1 Power cord 1 Connector (DB-25P-N) 1 (Japan Aviation Electronics Industry, Limited or equivalent)

(Shell DB19678-2)

■ Shipment

NOTE

If the 3331 unit is to be shipped or transported, the original packing should preferably be used. If this is not available, employ the following procedure.

1. Procure a packing case somewhat larger than the unit, such as a cardboard box.

2. Wrap the unit in plastic sheeting.

3. Pack the unit wrapped in this cushioning material into the box, pack in the accessories, add more cushioning to fill the box tightly, and then seal it with adhesive tape. If required, secure the case with shipping twine.

When reusing the original for the unit, use cushioning to secure the unit so the unit will not move around in the box.

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Inspection

iii

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Safety Notes

This Instruction Manual provides information and warnings essential for operating this equipment in a safe manner and for maintaining it in safe operating condition. Before using this equipment, be sure to carefully read the following safety notes.

DANGE R

Safety symbols

This equipment is designed according to IEC 61010 Safety Standards, and has been tested for safety prior to shipment. During high voltage measurement, incorrect measurement procedures could result in injury or death, as well as damage to the equipment. Please read this manual carefully and be sure that you understand its contents before using the equipment. The manufacturer disclaims all responsibility for any accident or injury except that resulting due to defect in its product.

・ This symbol is affixed to locations on the equipment where the

operator should consult corresponding topics in this manual (which are also marked with the symbol) before using relevant functions of the equipment.

・ In the manual, this mark indicates explanations which it is

particularly important that the user read before using the equipment.

Indicates a grounding terminal.

Indicates AC (Alternating Current).

The following symbols are used in this Instruction Manual to indicate the relative importance of cautions and warnings.

DANGE R

Indicates that incorrect operation presents extreme danger of accident resulting in death or serious injury to the user.

WARNING

Indicates that incorrect operation presents significant danger of accident resulting in death or serious injury to the user.

CAUTION

NOTE

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Indicates that incorrect operation presents possibility of injury to the user or damage to the equipment.

Denotes items of advice related to performance of the equipment or to its correct operation.

Safety Notes

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Measurement categories

This instrument complies with CAT III safety requirements. To ensure safe operation of measurement instruments, IEC 61010 establishes safety standards for various electrical environments, categorized as CAT II to CAT IV, and called measurement categories.

CATⅡ

CATⅢ

CATⅣ

Primary electrical circuits in equipment connected to an AC electrical outlet by a power cord (portable tools, household appliances, etc.) CAT II covers directly measuring electrical outlet receptacles.

Primary electrical circuits of heavy equipment (fixed installations) connected directly to the distribution panel, and feeders from the distribution panel to outlets.

The circuit from the service drop to the service entrance, and to the power meter and primary overcurrent protection device (distribution panel).

Using a measurement instrument in an environment designated with a higher-numbered category than that for which the instrument is rated could result in a severe accident, and must be carefully avoided.

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Safety Notes

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Notes on Use

In order to ensure safe operation and to obtain maximum performance from the unit, observe the cautions listed below.

DANGE R

WARNING

This unit cannot be used on voltage lines of 600 Vrms. If the

voltage exceeds 600 VAC, there will be a short-circuit accident or electrocution accident will result.

The maximum input voltage and current are 600 Vrms, 60 Arms. Do

not exceed the maximum input voltage and current. Doing so can damage the unit or cause a serious accident.

The maximum rated voltage between input terminals and ground is

600 Vrms. Attempting to measure voltages exceeding 600 Vrms with respect to ground could damage the instrument and result in personal injury.

Always connect the powermeter input to the secondary side of the

breaker. On the secondary side of a breaker, even if the lines are shorted the breaker can trip and prevent an accident. On the primary side, however, the current capacity may be large, and in the event of a short-circuit there may be a serious accident.

Before turning on the power, make sure that the voltage of the power

supply being used matches the supply voltage indicated on the rear panel of the unit. If an attempt is made to use an improper supply voltage, there is danger of damage to this unit and of life-threatening risk to the operator.

In order to prevent electric shock and short-circuit accidents, shut

off the power to the line to be measured before connecting the

direct connection voltage and current cables to the terminals.

Be sure to connect the voltage input terminals or current input

terminals correctly. Measurement which is attempted with the wiring connected incorrectly may cause damage to the unit or a shortcircuit.

Since the power switch is of a micro gap construction, always use near an outlet. When not in use and when connecting a device to be measured, make sure that the power cord is unplugged, or any other means so that the unit is cut off from the power.

The unit is constructed so as to be connected to a ground line via a

three-core power cord that is supplied with the unit. In order to

avoid electric shock, connect the unit to a properly grounded (3-pin)

outlet using the power cord provided.

Do not remove the case of the unit. There are components inside

carrying high voltages or becoming hot, and this could cause an electric shock accident.

Do not use the unit where it may be exposed to corrosive or

explosive gases. The unit may be damaged, or explosion may occur.

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Notes on Use

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CAUTION

・ Before measurement, check the position of the measurement range.

The unit may be damaged if voltage or current at levels in excess of the measurement limit is applied for a long time.

・ To avoid damage to the unit, do not short the output terminal and do

not input voltage to the output terminal.

・ Do not store or use the unit where it will be exposed to direct sunlight,

high temperatures, high humidity, or condensation. If exposed to such conditions, the unit may be damaged, the insulation may deteriorate, and the unit may no longer satisfy its specifications.

・ This unit is designed for indoor use and can be safely used at

temperatures ranging from 0℃ to 40℃.

・ To avoid damage to the unit, do not subject the equipment to

vibrations or shocks during transport or handling. Be especially careful to avoid dropping the equipment.

・ Should the unit emit smoke, or a strange smell or strange sound,

immediately stop testing operations, power the unit off, and remove the power cord from the outlet, shut off the circuit being tested, disconnect the unit, and consult your HIOKI representative. Continued use of the unit could lead to fire or electric shock accidents.

・ Do not insert foreign objects through the ventilation holes. Particularly

if metallic, liquid, or combustible substances get inside the case, this may lead to fire or electric shock, or to malfunction.

・ Do not use the unit near any device which generates strong

electromagnetic radiation or near a static electrical charge, as these may cause errors.

・ To prevent electric shock, do not allow the unit to become wet and do

not use the unit when your hands are wet.

・ This unit is not constructed to be waterproof or dustproof, so do not

use it in a very dusty environment or in one where it will get wet.

・ Do not place the unit on an unstable stand, or in an uneven location. It

may fall to the ground, or fall over, and either of these events may lead to malfunction or accident.

・ Avoid treading on or pinching the cable so as not to damage the cable

sheaths.

・ Keep the cables well away from heat, to prevent the possibility of

melting the insulation. ・ For long-term storage, remove the power cord. ・ Do not use the unit near any device which generates strong

electromagnetic radiation or near a static electrical charge, as these

may cause errors. ・ The recommended calibration interval for this instrument is six months.

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Notes on Use

vii

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NOTE

･ This unit uses the two-power method for measuring a three-phase line. For

this reason, if there is a leakage current from the line being measured, or in a four-wire three-phase system, accurate measurement is not possible.

･ This unit is electrically configured specifically for AC currents. Thus signals

with elements of DC currents (such as all-wave rectifier) cannot be measured.

･ For accurate measurement, allow the unit to warm up for more than half an

hour before starting operation.

･ Note that limits are specified for the range in which voltage and current level

accuracies are guaranteed.

･ The values for apparent power (S), reactive power (Q), power factor (λ)and

phase angle (φ) produced by this unit are computed from the measured voltage (U), current (I), and active power (P), using the expressions given in the specifications. The values given may be different from those measured with an instrument of different operating principles or using different calculation expressions.

･ This machine's integration value is derived from the measured values of the

electrical current and electrical power and calculated by the software. The integration value may be different from other instruments that have differing response times, sample rate or calculation expressions.

･ Accurate measurement may be impossible in locations subject to strong

external magnetic fields, such as transformers and high-current conductors, or in locations subject to strong external electric fields, such as radio transmission equipment.

･ Due to the internal circuitry, when measuring objects that contain certain

specific wave lengths, the indicated value of power may periodically shift and not settle down. (Specifically, this occurs when measuring distorted waves containing a large amount of high frequency waves which are the even number multiple of 2.44 kHz.)

･ When the input is less than 0.1% of the measurement range, the indication is

forcibly set to zero.

･ The 3331 has a frequency measurement function, but this may produce

unexpected results on a waveform which is severely distorted.

･ When a maximum rated voltage to earth of high frequency is applied (as for

example when measuring the secondary side of an inverter), errors may occur in the measured values.

･ To ensure the accuracy of measurement be careful not to let the unit

overheat. (Keep away from sources of heat, and provide sufficient ventilation space around the unit, or when rack-mounted provide a cooling fan.)

･ This instrument may cause interference if used in residential areas. Such use

must be avoided unless the user takes special measures to reduce electromagnetic emissions to prevent interference to the reception of radio and television broadcasts.

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Notes on Use

viii

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Notes on Use

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Chapter 1

1.1 Product Overview

The 3331 POWER HiTESTER is a power tester for AC three-phase threewire and single-phase, which is suitable for measuring the three phase products and three phase power line. With this one unit, it is possible to measure voltage, current, active power, apparent power, reactive power, the power factor, phase angle, frequency and integrated value. By using the peak-hold function, the peak value of the current waveform during powering on can be measured.

Overview

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1.1 Product Overview

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1.2 Features

(1) Meets the safety requirements of IEC61010 (2) Wide broad band from 10 Hz to 100 kHz. (3) In reactive power, power factor, and phase indication, it is possible to

recognize the phase is lead or lag.

(4) The current range is wide. (from 0.5 A to 50 A) (5) Analog output for voltage, current, and active power is provided. (3φ3W) (6) Monitor output (waveform output) for voltage and current is provided.

(3φ3W)

(7) It is possible to measure the plus, minus, total current, power integrations,

and current integrations simultaneously. (8) The terminals for voltage and current measurements are insulated. (9) All measurement data has synchronism.

(10) By using the GP-IB Interface and the RS-232C Interface, it is possible to

print out this unit's controls an d data.

(11) This unit will convert either voltage, current, effective power, apparent

power, reactive power, power factor, phase angle, frequency, integration

value, and current peak value into ±5 V f.s. direct voltage and output from

the D/A output terminal.

(12) Small-sized and light weight (13) With the 50 A range, large currents can be accurately measured. (14) With two voltage inputs and two current inputs, all currents and voltages of

a three-phase line can be measured.

(15) The peak value of a current waveform is measured. (16) The delay time from an input to an analog output is about 0.2 seconds. (17) With the response setting at "SLOW" (about 1.6 seconds), stable

measurement is possible at 10 Hz and above.

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1.2 Features

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1.3 Principles of the Two-Power Method of Power

Measurement and V

Three-phase three-wire

power supply side

・

3 2

・

→I

The above figure shows a schematic circuit of a three-phase three-wire line. In the figure, V

・

,andI

・

,and

・

power (P) of a three-phase system is normally found as the sum of the powers of the three phases.

・

However, a three-phases three-wire system has no center point, and it is not possible directly to measure the power of each phase; moreover, even given a center point, three power meters are required simultaneously. For these reasons, usually the two-power method (two voltages, two currents) is used, measuring inter-line voltages. This can be derived by the following expressions. Measuring V

・

P=V

・

Since here expressions (1) and (2) are the same, it follo ws that the threephase power can be measured by the two-power method. This requires no special conditions, other than that the circuit is closed (that is, there are no leakage currents), and can therefore be used to find the threephase power whether the circuit is balanced or unbalanced. This unit uses the two-power method of power measurement. Additionally, since the voltage and current vectors each sum to zero, and therefore the following are obtained by the internal circuit:

・

|=|V

・

|=|-I

Thus yielding the third voltage and current values. Again, V3and I2can be measured regardless of whether or not there is distortion present.

・

Schematic circuit of a three-phase three-wire line

・

are vectors representing the (phase) line currents, and

are vectors representing the voltage of each of the phases. The

・

-V

・

-I

and I3Measurement

・

→I

・

Center

・

,andV

・

,andI

・

(-I

・

-I

・

→

are vectors representing the inter-line voltages,

・

with power meters, the following holds:

・

)

・

,V1=

・

(with closed circuit I

Three-phase three-wir load side

・

(1)

・

=0)

・

(2)

NOTE

Since with this unit I3is input to channel 2, on the display the current value shown for channel 2 is I3, and the current value shown for channel 3 is I2.

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1.3 Principles of the Two-Power Method of Power Measurement and V3 and I3 Measurement

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1.4 Identification of Controls and Indicators

Channels Display a Display c Display b Display d

Handle

Power switch

Stand

Channel 1 input

Connection mode

Response speed

Rectifier type

Voltage range

Current range

Condition of integration, hold, settings

Front Panel

Current input terminal Voltage input terminal Connector for external control and output

RS-232C interface

Channel 2 input

GP-IB interface

AC inlet (Power supply connector)

Rear Panel

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1.4 Identification of Controls and Indicators

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1.5 Explanation for Keys

Key

MODE FUNC

RESPONSE

AVE･FREQ

FUNC

PT･CT

FUNC

▲

FUNC

▼

D/A

INTEG

ENTER

INTERFACE RECTIFIER

DATA OUT

HELP

START/STOP

RESET

LOCAL

KEY LOCK

To get the lower key indications, press the

Notation

in this manual

CHa

MODE

FUNCa

RESPONSE

CHb

AVE･FREQ

FUNCb

PT･CT

CHc

FUNCc

CHd

▲

FUNCd

▼

D/A

INTEG

ENTER

INTERFACE

RECTIFIER

DATA OUT

HELP

START/STOP

RESET LOCAL

KEY LOCK

Changes the display channel on the display a. Enter the connecting mode (1φ/3φ).

Changes the display item on the display a. Switches the response speed (FAST/SLOW).

Changes the display channel on the display b. Sets the averaging count and frequency.

Changes the display item on the display b. Sets the PT and CT ratios. Changes the display channel on the display c.

Moves the cursor to the left. Changes the display item on the display c.

Moves the cursor to the right. Changes the display channel on the display d.

Increases the setting value. Changes the display item on the display d.

Decreases the setting value. Decreases the voltage range.

Sets the D/A output item. Increase the voltage range.

Sets the integration time. Decreases the current range.

Enter the setting value. Increases the current range.

Sets the GP-IB and RS-232C. Switches the rectifier type (RMS/MEAN)

Sets the printer interval and output item. Outputs the measured value on the printer.

Outputs the setting values on the printer. Stops or starts the integration operation.

Resets the integration value. Releases the remote state via interface.

Sets the key lock state.

Operations Section

SHIFT

key first.

3.4

3.1

3.4

3.2

3.4

4.4, 4.5

3.4

4.7

3.4 4

3.5

4.6

3.5

4.3

3.5 4

3.5

4.9

3.3

4.8

8.2, 8.7

4.3.3

8.2

6.5

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1.5 Explanation for Keys

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HOLD

PEAK HOLD

SHIFT

HOLD

PEAK HOLD

SHIFT

Holds the display value. Holds the peak value and maximum value.

Validates the lower indicated function key. (indicator is lit)

3.6

2to6

Key operations during self-test when powering on SHIFT → RESET: system reset is performed after self-test SHIFT → ENTER: enter mode for changing the clock frequency of power

calculation circuit after self-test.

①→②:Press① and then ② in order.

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1.5 Explanation for Keys

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1.6 Display Reference

Indications Meaning

Numbers

1, 2, 3, SUM

m, k, M V, A, W, VA, var, PF, ○,

Ip, Hz, Ah, +Wh, -Wh ±Wh, TIME

1φ,3φ

AUTO, FAST, SLOW

RMS, MEAN

AUTO, 150, 300, 600

AUTO, 0.5, ....50

RUN

SC AV

Measurement value Indicates channel displayed. Indicates the prefix of unit. Indicates the unit and display item.

Voltage, current, active power, apparent power, reactive power, power factor, phase angle, current peak frequency, integration power, positive integration power, negative integration power, total integration power, integration elapsed time

Indicates connecting mode. Indicates response time. Indicates the rectifier type (RMS: true rms value, MEAN: average

rectifier effectiveness value conversion) Indicates the voltage range (AUTO: auto-ranging on) Indicates the current range (AUTO: auto-ranging on) Indicator is lit during integration operating, flashes when it stops, goes

off when it is reset. Indicator is lit when the PT ratio or CT ratio is other than 1. Indicator is lit excluding when the number of times of averaging are set

to OFF (1)

HOLD KEY LOCK SHIFT RMT PRINT

(left side of display c)

OVER o.r V, A, W (

Wh, Ah (

S.Err

----

flashing) Indicates that there was the value which is out of range during

Indicates HOLD status. The indicator is flashing in the peak hold. Indicates key lock status. Indicates SHIFT status The unit is in remote control state. Indicator is lit when the interface is in printer mode, or when GP-IB is

communicating and outputting data. When displaying Hz, indicates on the left side of display c.

"_": 50 kHz range, "_": 500 Hz range Indicates the input's peak value has exceeded the range by 6 times. Indicates the value exceeds the display range. (o.r) = out of range

averaging.

integration. Indicates the PT or CT ratio was set so that the scaling result exceeds

99999M at 130% f.s. input. (scaling error) Indicates the invalid data because of changing frequency.

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1.6 Display Reference

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Setting

Meaning

indications

Average setting (number of times of average) Frequency setting (source, range) D/A output setting (item) Integration time setting Print out setting (time interval of prin ting, print item) PT (voltage transformer) ratio setting CT (current transformer) ratio setting GP-IB (address, control mode) setting RS-232C setting (baud rate, data length, parity, stop bit, control mode) Power computation circuit clock setting

Error indications Meaning

Backup error (press any key to deactivate, needs repair) ROM malfunction (cannot deactivate, needs repair) RAM malfunction (cannot deactivate, needs repair) RAM display malfunction (cannot deactivate, needs repair) Timer malfunction (cannot deactivate, needs repair) A/D,D/A converter malfunction (cannot deactivate, needs repair) Mix up of control by key and remote during integration (displayed

approx. 1 second) A non-executable key was pressed during integration (RUN indicator

lit/flashing) (displayed approx. 1 second) Integration was started while S. Err was displayed (displayed approx. 1

second) Integration was started when it was ±999999M (displayed approx. 1

second) Data was reset during integration (displayed approx. 1 second) A invalid key was pressed during HOLD (HOLD indicator lit/flashing)

(displayed approx. 1 second) A invalid key was pressed during display settings (displayed approx. 1

second) Key was pressed when the printer mode is not set for the interface

(displayed approx. 1 second) There is no room in the printer output memory (displayed approx. 1

second) The interface cannot be communicated. A CH key was pressed when the channel cannot be changed because of

the connection mode (displayed approx. 1 second) Example: Attempting to display W1 in three-phase mode.

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1.6 Display Reference

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Other indications Meaning

Item is valid in single-phase connection mode. (Setting) Item is valid in three-phase connection mode. (Setting)

・

Item is valid in single-phase, three-phase connection mode. (Setting) This item is not set. (Setting) In integration time setting, this indicates operation under external control. Data is sent to printer after recovery from power failure. Resets the 3331

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1.6 Display Reference

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1.7 Handle and Stand Operations

Removing the handle and stand

Screws

If the handle or feet are not required when the unit is rack-mounted, remove the fixing screws as shown in the figure on the left.

1. Remove the screws fixing on the handle.

Stand

Handle

Right side view

2. Remove the screws on the four feet (two feet with stands)

Screws

CAUTION

Handle

NOTE

Carefully store remove d handles, feet, and screws for use in locations other than the rack.

For the making rack mounting fittings, see Chapter 10, "Rack Mounting."

Be sure not to bear down too hard on the top of the unit when it is tilted upwards. Doing so may damage the stand.

Stand operation

The stands move in the direction indicated by the arrow. When raising or closing the stands, move them to where you hear them click into place.

NOTE

When raising the stands, be sure to raise both the left and right stand together.

Stand

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1.7 Handle and Stand Operations

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Chapter 2

Preparation for Measurement

2.1 Before Measurement

DANGE R

WARNING

Do not exceed the maximum input voltage and current. Doing so

can damage the unit or cause a serious accident.

The maximum rated voltage between input terminals and ground is

600 Vrms. Attempting to measure voltages exceeding 600 Vrms with respect to ground could damage the instrument and result in personal injury.

Always connect the powermeter input to the secondary side of the

To avoid electric shock accidents, do not touch the input terminals

of the unit on live lines, which is exposed.

In order to prevent electric shock and short-circuit accidents, shut

off the power to the line to be measured before connecting the

direct connection voltage and current cables to the terminals.

Be sure to connect the voltage input terminals or current input terminals

correctly. Measurement which is attempted with the wiring connected incorrectly may cause damage to the unit or a short-circuit.

If an attempt is made to use an improper supply voltage, there is

danger of damage to this unit and of life-threatening risk to the operator.

Before turning on the power, make sure that the voltage of the power

supply being used matches the supply voltage indicated on the rear panel of the unit.

The unit is constructed so as to be connected to a ground line via a

three-core power cord that is supplied with the unit. In order to

avoid electric shock, connect the unit to a properly grounded (3-pin)

outlet using the power cord provided.

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2.1 Before Measurement

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WARNING

CAUTION

When using an external current transformer, do not leave the secondary side open-circuit. If a current flows through the primary while the secondary is open-circuit, this can generate a high voltage on the secondary, which is extremely dangerous.

・ To avoid electric shock, the wiring which is used for making the

connections to the current input terminals should have sufficient current carrying capacity and insulation.

・ This unit is designed for indoor use and can be safely used at

temperatures ranging from 0℃ to 40℃.

・ Do not store or use the unit where it will be exposed to direct sunlight,

high temperatures, high humidity, or condensation. If exposed to such conditions, the unit may be damaged, the insulation may deteriorate, and the unit may no longer satisfy its specifications.

・ This unit is not constructed to be waterproof or dustproof, so do not

use it in a very dusty environment or in one where it will get wet.

・ Do not use the unit near any device which generates strong

electromagnetic radiation or near a static electrical charge, as these may cause errors.

・ To prevent electric shock, do not allow the unit to become wet and do

not use the unit when your hands are wet.

NOTE

･ This unit uses the two-power method for measuring a three-phase line. For

this reason, if there is a leakage current from the line being measured, or in a four-wire three-phase system, accurate measurement is not possible.

･ This unit is electrically configured specifically for AC currents. Thus signals

with elements of DC currents (such as all-wave rectifier) cannot be measured.

･ Because the polarity of the voltage and current will affect electrical

measurement, be sure the wiring is connected correctly.

･ If the voltage and current of the device being measured exceeds the

measurement range of this unit, please use an outside-connected PT, or CT. The measurement value can be directly read if the scaling function is used.

･ When using an outside connected trans (PT, CT), the phase differences of

those may cause differences in the electrical measurement. If a precise electrical measurement is necessary, use a PT or CT that has only a small phase difference from the wiring's wave length area that is to be used.

･ Make sure that the wiring of the electric wires are separated from this unit,

so that there is no effect on this unit from an outside magnetic field.

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2.1 Before Measurement

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2.2 Simple Use

Check that the line to be measured is shut off, and

測定対象のラインが遮断されていることを確認、およ

check that this unit is powered off and the power

び本器の電源が OFF され電源コードを抜いてあること

Connect the power cord of the 3331 to the outlet.

cord disconnected from the outlet.

Check that there is no short circuit.

Turn the 3331 power on.

を確認する

Make a connections.

Reference

Section 2.3, "Making the Connections"

Section 2.4, "Powering On "

Set the connection mode.

Set the display item.

Set the measurement range.

Set the each items.

Check the connection of line being measured again,

and turn on the power line.

Section 3.1, "Selecting the Connection Mode "

Section 3.4, "Selecting the Display "

Section 3.5, "Selecting the Range"

Chapter 3, 4

(Warming-up for more than 30 minutes)

Start the measurement.

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2.2 Simple Use

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2.3 Making the Connections

2.3.1 Direct Connections

DANGE R

WARNING

Always connect the power meter to the secondary side of a breaker. On the secondary side of a breaker, even if the lines are shorted the breaker can trip and prevent an accident. On the primary side, however, the current capacity may be large, and in the event of a short-circuit there may be a serious accident. Shut off the line power supply before connecting the voltage cable and current cable. If the voltage cables should be detached and touch the two wires, a shorting accident or electric shock may result. The maximum input voltage and current are 600 VAC, 60 A. Do not measure an input in excess of these limits, as the resulting heat buildup may damage the unit or cause a short-circuit accident. Once the connections are made, do not touch the input terminals of the voltage and current transformers. There are exposed live parts, and a danger of electric shock or serious accident. Check that the terminals are tightened securely. If the connections should become detached, there is a danger of a short-circuit or electric shock accident. Additionally, if the connections are not properly tightened, the contact resistance increases, which may lead to the generation of heat, or fire.

In order to prevent electric shock and short-circuit accidents, shut off the power to the line to be measured before connecting the direct connection voltage and current cables to the terminals. Be sure to connect the voltage input terminals or current input terminals correctly. Measurement which is attempted with the wiring connected incorrectly may cause damage to the unit or a shortcircuit. Do not short circuit between voltage input terminals, when making a connection. If not, a shorting accident or electric shock may result. To prevent accidental electrocution or short-circuits, make connections to the voltage and current input terminals using only insulated wire that is terminated with pressure-fitted terminals. (The voltage and current input terminals have an M6 axial diameter.) Before switching on power for the line to be measured, check that the connections and the wiring are not shorting between the voltage input terminals. If there is a short circuit, a electrical shock and or short circuit accident will occur.

CAUTION

To avoid electric shock, the wiring which is used for making the connections to the current input terminals should have sufficient current carrying capacity and insulation.

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2.3 Making the Connections

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single-phase three-wire or three-phase three-wire

Power supply side

Channel 1

Channel 2

Equivalent circuit

Load side

Channel 1

Channel 2

single-phase two-wire

Power supply side

Ａ

NOTE

･ Depending on the input level, power meter losses may affect measured

values. Refer to Section 2.3.3 for how to make connections that minimize power meter losses.

･ If the instrument is affected by common mode voltage, connect an

ammeter as shown as B to reduce the error.

･ When measuring a single-phase two-wire system, set the wiring connection

mode to 1φ. (Refer to Section 3.1 "Selecting the Connection Mode".) However, all settings, such as the range, PT, and CT, of the CH1 and CH2 are common.

Load side

Power supply side

Ｂ

3331 input terminals (Channel 1 or

Channel 2)

Load side

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2.3 Making the Connections

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2.3.2 When Using PT or CT

DANGE R

WARNING

Once the connections are made, do not touch the input terminals of the voltage and current transformers. There are exposed live parts, and a danger of electric shock or serious accident. Check that the terminals are tightened securely. If the connections should become detached, there is a danger of a short-circuit or electric shock accident. Additionally, if the connections are not properly tightened, the contact resistance increases, which may lead to the generation of heat, or fire.

When using an external voltage transformer, do not leave the secondary side short-circuited. If a voltage is applied to the primary while the secondary is short-circuited, a high current will flow through the secondary, which could lead to fire or malfunction. When using an external current transformer, do not leave the secondary side open-circuit. If a current flows through the primary while the secondary is open-circuit, this can generate a high voltage on the secondary, which is extremely dangerous. Before switching on power for the line to be measured, check that the connections and the wiring are not shorting between the voltage input terminals. If there is a short circuit, a electrical shock and or short circuit accident will occur. To prevent accidental electrocution or short-circuits, make connections to the voltage and current input terminals using only insulated wire that is terminated with pressure-fitted terminals. (The voltage and current input terminals have an M6 axial diameter.)

CAUTION

NOTE

Power supply side

To avoid electric shock, the wiring which is used for making the connections to the current input terminals should have sufficient current carrying capacity and insulation.

･ By setting the PT ratio and the CT ratio, it is possible to directly read the

first side of the PT and CT. For details, refer to Section 4.7, "Setting the PT and CT Ratios."

･ The secondary side of the PT or CT must be grounded for safely. (Since

most previously attached PT and CT's are already grounded, please check before grounding.)

･ When using an outside connected trans (PT,CT), the phase differences of

･ Depending on the input level, power meter losses may affect measured

values. Refer to Section 2.3.3 for how to make connections that minimize power meter losses.

Load side

Channel 1

Channel 2

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2.3 Making the Connections

+ 184 hidden pages

Hioki 3331 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual