Hioki Hioki FT6031-03 Manual

Download

Instruction Manual

FT6031

EARTH TESTER

99 Washington Street Melrose, MA 02176

Phone 781-665-1400 Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

July 2014 Edition 1 FT6031A981-00 14-07H

Introduction .........................................................................1

Verifying Package Contents ..............................................1

Options (sold separately) ..................................................2

Safety Notes ........................................................................ 3

Usage Notes ........................................................................ 8

1 Overview 13

1.1 Overview and Features .................................13

Overview ................................................................... 13

Features .................................................................... 13

1.2 Parts Names and Functions .........................15

1.3 How to Use Carrying Case ...........................20

2 How to Measure 21

2.1 Measurement Workﬂ ow ................................ 21

2.2 Attaching/Removing Protector ....................24

2.3 Inserting/Replacing Batteries ......................25

2.4 Inspection before Use ................................... 29

2.5 Setting Up Comparator (PASS/FAIL Test) ...31

How to set up comparator ......................................... 32

How to disable comparator ....................................... 32

2.6 Precise Measurement for Earth Resistance (Precise Measurement Method,

Three-pole Method) .......................................33

Performing zero adjustment ...................................... 35

Connecting measurement cables .............................36

Measuring earth resistance ......................................39

Stowing ..................................................................... 42

2.7 Simpliﬁ ed Measurement for Earth Resistance (Simpliﬁ ed Measurement Method,

Two-pole Method) ..........................................44

Performing zero adjustment ...................................... 46

Connecting test leads ...............................................48

Measuring earth resistance ......................................51

Stowing ..................................................................... 51

2.8 Cautions and Tips for Measurement ........... 52

Distance between earthing electrodes ...................... 52

Location to install auxiliary earthing rod .................... 53

How to insert / pull out auxiliary earthing rod ............54

2.9 Auto Power Save (Power-saving Function) 56

2.10 Activating the LCD All-on Display ............... 57

2.11 Displaying the Serial number ....................... 58

3 Speciﬁ cation 59

3.1 General Speciﬁ cation ...................................59

3.2 Measurement Function/Performance ..........61

4 Maintenance and Service 67

4.1 Repair, Inspection, and Cleaning .................67

4.2 Troubleshooting ............................................69

4.3 Error Display ..................................................72

Appendix Appx. 1

Appendix 1 Earth Resistance ...................Appx. 1

Appendix 2 Measurement Principle ......... Appx. 3

Introduction

Thank you for purchasing the HIOKI FT6031 Earth Tester. To obtain maximum performance from the product, please read this manual ﬁ rst, and keep it handy for future reference.

Verifying Package Contents

When you receive the instrument, inspect it carefully to ensure that no damage occurred during shipping. In particular, check the accessories, panel switches, and connectors. If damage is evident, or if it fails to operate according to the speciﬁ cations, contact your authorized Hioki distributor or reseller.

Check the package contents as follows.

FT6031

L9840 L9841 Measurement Cable

L9842-11 Measurement Cable

L9842-22 Measurement Cable

C0106 Carrying Case ×1

Protector

LR6 Alkaline battery × 4 Instruction manual

Accessory

Auxiliary Earthing Rod (2 piece set) ×1

(alligator clip, black 4 m) ×1

(yellow 10 m, equipped with winder) ×1

(red 20 m, equipped with winder) ×1

Options (sold separately)

The following options are available for the instrument. Contact your authorized Hioki distributor or reseller when ordering.

L9787 Test Lead

L9840 Auxiliary Earthing Rod

L9841 Measurement Cable

L9842-11 Measurement Cable

(for simpliﬁ ed measurement method, indoor use only, red and black 1.2 m each)

(for precision measurement method, 2 pcs in 1 set) (6 mm, entire length of 270 mm, straight section 235 mm, material: stainless SUS304)

(for precision measurement method, alligator clip, black 4 m)

(for precision measurement method, yellow 10 m, equipped with winder)

L9842-22 Measurement Cable

L9843-51 Measurement Cable

L9843-52 Measurement Cable

L9844 Measurement Cable

9050 Earth Nets

C0106 Carrying Case

(for precision measurement method, red 20 m, equipped with winder)

(for precision measurement method, yellow 50 m, equipped with ﬂ at cable winder)

(for precision measurement method, red 50 m, equipped with ﬂ at cable winder)

(for earthing terminal board, alligator clip, 3 cables in 1 set, red/yellow/black 1.2 m each)

(2 sheets in 1 set, 300 mm × 300 mm)

Safety Notes

This instrument is designed to conform to IEC 61010 Safety Standards, and has been thoroughly tested for safety prior to shipment. However, using the instrument in a way not described in this manual may negate the provided safety features.

Before using the instrument, be certain to carefully read the following safety notes.

DANGER

Mishandling during use could result in injury or death, as well as damage to the instrument. Be certain that you understand the instructions and precautions in the manual before use.

WARNING

With regard to the electricity supply, there are risks of electric shock, heat generation, ﬁ re, and arc discharge due to short circuits. If persons unfamiliar with electricity measuring instruments are to use the instrument, another person familiar with such instruments must supervise operations.

Safety Notes

Notation

In this manual, the risk seriousness and the hazard levels are classiﬁ ed as follows.

Indicates an imminently hazardous situation

DANGER

WARNING

CAUTION

IMPORTANT

that will result in death or serious injury to the operator.

Indicates a potentially hazardous situation that may result in death or serious injury to the operator.

Indicates a potentially hazardous situation that may result in minor or moderate injury to the operator or damage to the instrument or malfunction.

Indicates information related to the operation of the instrument or maintenance tasks with which the operators must be fully familiar.

Indicates a high voltage hazard. If a particular safety check is not performed or the instrument is mishandled, this may give rise to a hazardous situation; the operator may receive an electric shock, may get burnt or may even be fatally injured.

Indicates prohibited actions.

Indicates the action which must be performed.

Additional information is presented below.

Symbols afﬁ xed to the instrument

Indicates cautions and hazards. When the symbol is printed on the instrument, refer to a corresponding topic in the Instruction Manual.

Indicates a double-insulated device.

Indicates DC (Direct Current).

Indicates AC (Alternating Current).

Indicates the power switch mark.

Symbols for various standards

Indicates the Waste Electrical and Electronic Equipment Directive (WEEE Directive) in EU member states.

Indicates that the instrument conforms to safety regulations set out by the EC Directive.

Safety Notes

Screen display

This instrument uses the following screen displays.

ABCDEFGH I J KLMNOPQRSTUVWXYZ

1234567890

Accuracy

We deﬁ ne measurement tolerances in terms of f.s. (full scale), rdg. (reading) and dgt. (digit) values, with the following meanings:

(Maximum display value)

f.s.

The maximum displayable value.

(Reading or displayed value)

rdg.

The value currently being measured and indicated on the measuring instrument.

(Resolution) The smallest displayable unit on a digital measuring

dgt.

instrument, i.e., the input value that causes the digital display to show a “1” as the least-signiﬁ cant digit.

Safety Notes

Measurement categories

To ensure safe operation of measuring instruments, IEC 61010 establishes safety standards for various electrical environments, categorized as CAT II to CAT IV, and called measurement categories.

DANGER

• Using a measuring 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.

• Using a measuring instrument without categories in

an environment designated with the CAT II to CAT IV category could result in a severe accident, and must be carefully avoided.

This instrument conforms to the safety requirements for CAT II 300V, CAT III 150 V, CAT IV 100 V measuring instruments. CAT II: When directly measuring the electrical outlet receptacles of

CAT III: When measuring the primary electrical circuits of heavy equipment

CAT IV: When measuring the circuit from the service drop to the service

the primary electrical circuits in equipment connected to an AC electrical outlet by a power cord (portable tools, household appliances, etc.).

(ﬁ xed installations) connected directly to the distribution panel, and feeders from the distribution panel to outlets.

entrance, and to the power meter and primary overcurrent protection device (distribution panel).

Distribution Panel

Service Entrance

Service Drop

CAT IV

Power Meter

Internal Wiring

CAT III

Fixed Installation

CAT II

Outlet

Usage Notes

Follow these precautions to ensure safe operation and to obtain the full beneﬁ ts of the various functions.

Verifying before usage

Before using the instrument, verify that it operates normally to ensure that no damage occurred during storage or shipping. If you ﬁ nd any damage, contact your authorized Hioki distributor or reseller.

DANGER

Before using the instrument, check that the coating of the test leads and cables are neither ripped nor torn and that no metal parts are exposed. Using the instrument under such conditions could result in electric shock. Replace the test leads and cables with those speciﬁ ed by our company.

IMPORTANT

Use only the speciﬁ ed test leads and cables. Using a non- speciﬁ ed cable may result in incorrect measurements due to poor connection or other reasons.

Usage Notes

Use environment of the device

The protection rating for the enclosure of this device (based on EN60529) is *IP65/67.

CAUTION

Although this device has a dust-proof, jet-proof and waterproof structure, it is not for completely shutting out the water intrusion into the inside. Please note that it can be a cause of failure.

*IP65/67:

This indicates the degree of protection provided by the enclosure of the device against use in hazardous locations, entry of solid foreign objects, and the ingress of water.

6: Protected against access to hazardous parts with

wire measuring 1.0 mm in diameter. Dust-proof type (Dust shall not penetrate the enclosure.)

5: The equipment inside the enclosure is protected

against the harmful effects of water projected in jets against the enclosure from any direction.

7: Watertight (Quantities of water that may harm the

enclosure when it is temporarily immersed in water shall not penetrate the enclosure.)

Usage Notes

For details on the operating temperature and humidity, see the speciﬁ cations. (p. 59)

CAUTION

• Installing the instrument in inappropriate locations may cause a malfunction of instrument or may give rise to an accident. Avoid the following locations.

• Exposed to corrosive or combustible gases

• Exposed to water, oil, chemicals, or solvents

• Exposed to high humidity or condensation

• Exposed to a strong electromagnetic ﬁ eld or electrostatic charge

• Near induction heating systems (such as highfrequency induction heating systems and IH cooking equipment)

• Susceptible to vibration

• Do not store or use the instrument where it could be exposed to direct sunlight or high temperature.

• To avoid damage to the instrument, protect it from physical shock when transporting and handling. Be especially careful to avoid physical shock from dropping.

• Do not place the device on an unstable table or an inclined place. Dropping or knocking down the device can cause injury or damage to the device.

Handling the cables

CAUTION

• To prevent cable damage, do not step on cables or pinch them between other objects. Do not bend or pull on cables at their base.

• The ends of the L9787 Test lead and L9840 Auxiliary earthing rod are sharp. Be careful to avoid injury.

• Use only the speciﬁ ed auxiliary earthing rod, cables, and test leads. Using a non-speciﬁ ed cable may result in incorrect measurements due to poor connection or other reasons.

Precautions during measurement

WARNING

If the instrument is used in locations where the rating indicated on the instrument or cords is exceeded, the instrument may be damaged resulting in personal injury. Do not use the instrument in such locations. See “Measurement categories” (p.7).

Precautions during shipment

CAUTION

• When transporting the instrument, use the original packing materials in which it was shipped, and pack in a double carton. Damage occurring during transportation is not covered by warranty.

• To avoid damage to the instrument, remove the accessories and optional equipment from the instrument before shipment.

Usage Notes

Overview

1.1 Overview and Features

Overview

The grounding works applied to the distribution lines and electrical facilities are essential for preventing electric shock and ﬁ re as well as for safeguarding the equipment. This instrument is an earth tester that is fully functional for measuring earth resistance for grounding works. It is capable of providing accurate and highly reliable measurement. The instrument can provide precision measurement (three-pole method) and simpliﬁ ed measurement (two-pole method).

Features

High accuracy

Auto-range and

auto-check for

auxiliary earthing

electrode

High allowable

earth resistance for

auxiliary earthing

electrode

The accuracy of the 200.0 rdg. ±4dgt.

The measurement is performed by simply pressing MEASURE button. There is no need for cumbersome range-switching. In addition, the earth potential and auxiliary earthing electrode are automatically checked.

The resistance that the auxiliary earthing electrode can tolerate is now about 10 times higher than the conventional level. As a result, it can provide measurement under adverse conditions.

range is ±1.5%

Overview and Features

Dust-proof,

jet-proof and water-

proof

Supplied with a

winder

Drop-proof

(when equipped with

a protector)

The instrument can withstand water at a depth of 1m for 30 minutes.

The instrument is supplied with a useful winder so that it can be easily prepared and packed up before/after measurement.

Its robust structure can withstand a drop from 1 m onto concrete surface.

Parts Names and Functions

1.2 Parts Names and Functions

Front

Protector

Removed when replacing the batteries. (p. 24, p. 68)

Operation buttons

(p. 17)

Please do not press the buttons of the device with a sharp object. It may damage the device.

Measurement terminals

E Connected with the black cable. S(P) Connected with the yellow cable. H(C) Connected with the red cable.

Display

(p. 18)

Parts Names and Functions

Rear and Sides

Battery cover (side view)

Waterproof seal

It needs to be replaced when degraded. Please contact your authorized Hioki distributor.

Battery cover

Removed when replacing the batteries. (p. 25)

Serial number label

Please do not remove the label as it is needed for product control such as product warranty etc.

Operation Buttons

Parts Names and Functions

Start/stop for measuring earth resistance

• Displays the resistance of each earthing electrode. (p. 39)

• Display switching (three-pole method, two-pole method)

• DC/AC switching (when measuring earth potential)

• Function switching (three-pole method, two-pole method)

• Unlocks the retained value and displays the current earth potential value.

Power ON/OFF

Sets/cancels comparator setting (COMP lights up/goes off). (p. 31)

Sets/cancels zero adjustment setting. (p. 35, p. 46)

Parts Names and Functions

1 2

Display

1 2

Parts Names and Functions

Comparator

comparison result (PASS)

Comparator comparison result (FAIL)

Lights up when DC/ AC auto-detect setting is enabled for measuring earth potential.

Three-pole method (p. 33)

Two-pole method (p. 44)

Zero adjustment (p. 35, p. 46)

Displays when

COMP

comparator setting is enabled. (p. 31)

Retention of the measured value

Displays when earth potential exceeds allowable range.

Displays the battery level. (p. 27)

Displayed 30 sec. before auto-power-

APS

save function is activated. (p. 56)

See p. 72 for error display.

Indicates the terminal to be connected with measurement cable or test lead.

Turns on when the resistance of each (auxiliary) earthing

OPEN

electrode is high or a measurement cable is not connected.

Earth resistance of earthing electrode

Earth resistance of auxiliary earthing electrode S

Earth resistance of auxiliary earthing electrode H

Live wire warning indicator (red LED lights up as follows)

• For three-pole method, 30 V or higher between S(P)-E terminals or 85 V or higher between H(C)-E terminals and H(C)-S(P) terminals.

• For two-pole method, 30 V or higher between H(C)-E terminals.

• When measuring earth resistance.

How to Use Carrying Case

1.3 How to Use Carrying Case

Please store the device, winder and other accessories/options into the C0106 Carrying Case as shown in the ﬁ gure below.

• Please do not store commercially available pegs in this carrying case as those have sharp tips. It may damage the case.

• Please do not wash the carrying case.

• Winder

• Auxiliary Earthing Rod

Earth Tester

Please make sure to retract the winder knob before storing it in the carrying case.

Measurement Cable (Black)

Instruction Manual

How to Measure

2.1 Measurement Workﬂ ow

Before using the instrument, be sure to read “Usage Notes” (p.8).

Preparation

Insert the batteries. (p.25)

As necessary, have other

Perform the startup check. (p.29)

Measurement

Turn the power on and select the measurement method.

optional items available and ready.

Connect measurement cables or leads to the measurement terminals.

Perform zero adjustment. (three-pole method (p.35), two-pole method (p.46))

Start the measurement.

test

End of the measurement

Turn the power off and remove measurement cables or test leads from the measuring object.

Measurement Workﬂ ow

• This product should only be connected to the

secondary side of a breaker, so the breaker can prevent an accident if a short circuit occurs. Connections should never be made to the primary side of a breaker, because unrestricted current ﬂ ow could cause a serious accident if a short circuit occurs.

• Connect the test lead to the instrument ﬁ rst, and

then to the active lines to be measured. To avoid electric shock and short circuits, do not shortcircuit two wires to be measured by bringing the metal part of the test lead's clip into contact with them. Never touch the metal end of the clip.

To avoid electric shock, observe the following precautions.

• Prior to measurement, please make sure that the

earthing electrode has been disconnected from the distribution system. The measurement cables L9841, L9842-11, L9842-22, L9843-51 and L9843-52 are measurement cables with the maximum rated voltage of 30 V (between input terminals and the ground) and are designed to measure the earth resistance of an earthing electrode disconnected from the distribution system.

• Turn off all power before connecting cables and test

leads.

• Conﬁ rm that all connections of cables and test

leads are secure to the measurement terminals. The increased resistance of loose connections can lead to overheating and ﬁ re.

DANGER

WARNING

Measurement Workﬂ ow

WARNING

• To prevent electric shock, conﬁ rm that the white

or red portion (insulation layer) inside the cable of L9787 test lead and L9844 measurement cable are not exposed. If a color inside the cable is exposed, do not use the cable.

CAUTION

• To avoid damaging the cables and test leads, grasp the connector, not the cable, when unplugging the cable.

Attaching/Removing Protector

2.2 Attaching/Removing Protector

Attaching the protector

Tilt the device and slide it into the protector, and then push the entire device into the protector.

Removing the protector

Hold it with both hands and push the one end of the protector down.

IMPORTANT

If the protector is removed, drop-proof (p.60) will be void.

Inserting/Replacing Batteries

2.3 Inserting/Replacing Batteries

Before using the instrument ﬁ rst time, insert 4 LR6 alkaline batteries. Before measurements, check that the battery level is sufﬁ cient. When the battery charge is low, replace the batteries.

WARNING

• To avoid electric shock, turn off the power and disconnect the cables and test leads before replacing the batteries.

• To prevent instrument damage or electric shock, use only the screws for securing the battery cover in place that shipped with the product. If you have lost any screw or ﬁ nd that any screws are damaged, please contact your Hioki distributor for a replacement.

• Battery may explode if mistreated. Do not short- circuit, disassemble or dispose of in ﬁ re. Do not recharge alkaline batteries. Handle and dispose of batteries in accordance with local regulations.

• After replacing the batteries, replace the cover, screws, and put on the protector before using the instrument.

Inserting/Replacing Batteries

CAUTION

Poor performance or damage from battery leakage could result. Observe the cautions listed below.

• Do not mix new and old batteries, or different types of batteries.

• Be careful to observe the battery polarity during installation.

• Do not use batteries after their recommended expiry date.

• Do not allow used batteries to remain in the instrument.

• To avoid corrosion from battery leakage and/or damage to the instrument, remove the batteries from the instrument if it is to be kept in storage for an extended period.

• If the battery level is low, mark blinks. To carry out measurement, the batteries need to be replaced with new ones.

• After use, be sure to turn off the instrument.

• Although rechargeable batteries (nickel-hydride) can be used for measurement, the battery level indicator will not be accurately displayed.

• When replacing the batteries after cleaning, the replacement should be carried out after the device has been completely dried.

• The operating temperature of the batteries included in the shipment is -10°C to 45°C (14°F to 113°F). When using this

device outside this temperature range, use batteries that can support such a low or high temperature range.

Battery warning indicator

Fully charged.

As the battery charge diminishes, black charge bars disappear, one by one, from the left of the battery indicator.

The battery voltage is low. Replace the batteries as soon as possible.

(Blinks) The battery is exhausted. Replace the batteries.

Inserting/Replacing Batteries

ter

Rear

Battery Cover

Screwdriver

Have the following items

available and ready.

Phillips screwdriver

•

LR6 Alkaline battery × 4

•

Turn off the device and

remove the measurement cables or test leads from the device.

Remove the protector. (p.24)

Unscrew the screws of the

battery cover with a phillips screwdriver.

Remove the battery cover.

Do not remove the waterproof seal from the battery cover.

When replacing the batteries,

all of the old batteries should be removed.

Pay attention to the

polarities of the batteries when inserting 4 new batteries (LR6).

Reattach the battery cover

onto the device and tighten the screws.

Attach the protector. (p.24)

Inspection before Use

2.4 Inspection before Use

Check items Solution

Is the battery level sufﬁ cient? Check the battery level indicator on the upper

Is there any missing segment in the display items?

Is there any damage or crack in the device?

Is there any foreign material (sand etc.) inside the measurement terminals?

Is there any damage or exposed internal white part or metal in the coating of measurement cable or test lead?

right corner while the power has been turned on. If Replace the batteries with new ones. (p.25)

Check by activating the LCD all-on display. (p.57) If there is a missing segment, the device needs to be repaired.

Conduct visual checking. If damage is found, the device should not be used and needs to be repaired as it can cause electric shock.

Remove all foreign materials if any. If it cannot be removed, the device needs to be repaired.

If damage is found, it should not be used and needs to be replaced as it can cause electric shock.

is blinking, the battery level is low.

Inspection before Use

Check items Solution

Check for open circuit in measurement cable or test lead in the following method:

1. • For three-pole method Press Fn button to

display

• For two-pole metho Press Fn button to

display

2. Connect measurement cables or test leads to the device and shortcircuit their tips.

3. Press MEASURE button to check that approx. 0

is indicated.

If not indicating approx. 0

• The measurement cables or test leads have not been fully inserted. →Fully insert the leads.

• The measurement cables or test leads may have an open circuit. →Replace it with another lead that is

speciﬁ ed by Hioki.

If the symptom persists even after the measurement cables or test leads are replaced, the device may have a failure. The device needs to be repaired.

Setting Up Comparator (PASS/FAIL Test)

2.5 Setting Up Comparator (PASS/FAIL Test)

The device has a comparator function, which can indicate PASS or FAIL with the display indicator and beep. The earth resistance can be measured without setting up the comparator.

The comparator function operates as follows:

Comparison result Display Buzzer sound

Measured value Reference

value (PASS)

Measured value > Reference

value (FAIL)

The comparison reference value can be chosen from the reference values in the following table.

Reference value (Ω)

12345

6789

10 20 30 40 50

60 70 80 90

100* 200 300 400 500 OFF

Intermittent

Continuous

*Default

Setting Up Comparator (PASS/FAIL Test)

2,3

How to set up comparator

Press Fn button to set to

(three-pole method), or

(two-pole method).

Press COMP button.

2,3

blinks, and the resistance for the

comparison reference appears.

Press COMP button again and then choose a comparison reference.

If there is no operation for approx. 2 seconds after the desired comparison reference has been chosen, the comparator is enabled and

The comparator setting is saved even after the power is turned off.

lights up in the display.

How to disable comparator

Press COMP button while the comparator has been enabled.

blinks.

Press COMP button and then select [OFF].

If there is no operation for approx. 2 seconds, the comparator is disabled.

Precise Measurement for Earth Resistance

(Precise Measurement Method, Three-pole Method)

2.6 Precise Measurement for Earth Resistance (Precise Measurement Method, Three-pole Method)

WARNING

This device can output a voltage of approx. 30 V. Although the device has a dust-proof, jet-proof and water-proof structure, the device should always be dried before using it for measurement so as to avoid electric shock.

CAUTION

Do not connect the test leads if any foreign material remains inside. It may cause failure.

There are two types of measurement method for earth resistance: precision measurement method (three-pole method) and simpliﬁ ed measurement method (two-pole method), and the precision measurement method (three-pole method) is the basic measurement method for earth resistance. The simpliﬁ ed measurement method is used when measurement cannot be performed by the precision measurement method. The precision measurement is performed by inserting two auxiliary earthing rods into the ground as shown in the ﬁ gure on p.38.

Precise Measurement for Earth Resistance (Precise Measurement Method, Three-pole Method)

Measurement of large-scale earthing electrodes

When measuring a large-scale earthing electrode such as a mesh earthing electrode, ring earthing electrode, or earthing electrode provided by a large building structure, it cannot be accurately measured since the H(C) electrode and S(P) electrode come inside the earth resistance area of E electrode. If long cables are used to avoid the H(C) electrode and S(P) electrode getting inside the earth resistance area, accurate measurement cannot be carried out as it is signiﬁ cantly affected by noise. Generally, measurement of large-scale earthing electrode requires a large measurement current of approx. 20 A. Use measuring instrument designed for measuring large-scale earthing electrodes for this measurement. (No measuring instrument available for this purpose from Hioki)

Precise Measurement for Earth Resistance

(Precise Measurement Method, Three-pole Method)

Performing zero adjustment

Always perform zero adjustment prior to measurement.

Remove the cover that protects the

measurement terminals.

Make sure that no sand, gravels

or small stones remain inside the measurement terminals.

Connect black, yellow and red

measurement cables respectively to E, S(P) and H(C) terminals of the device.

Short-circuit the tips of the three

measurement cables.

Press the button to turn it on.

Press Fn button to display

(three-pole method).

Earth potential appears on the display.

Press MEASURE button.

A measured value of approx. 0 Ω appears in approx. 8 seconds, and

When OPEN appears below the measurement terminal ( not have been connected to a measurement terminal, or the cable may have an open circuit. cable check with a tester etc.

), the measurement cable may

Check the connection and perform

lights up.

Press 0ΩADJ button.

adjustment is completed.

lights up and then zero

Precise Measurement for Earth Resistance (Precise Measurement Method, Three-pole Method)

If the measured value exceeds 3 Ω, [Err 1] appears and zero adjustment will not be executed. Zero adjustment settings will be saved even if the power is turned off.

How to disable zero adjustment

Hold down

ADJ button for at least one second, while is on.

Connecting measurement cables

WARNING

• The maximum rated voltage between input terminals

and the ground is as follows; (CAT II): 300 V rms (CAT III): 150 V rms (CAT IV): 100 V rms Attempting to measure voltages exceeding this level with respect to ground could damage the instrument and result in personal injury.

• To avoid electric shock, be careful to avoid shorting

live lines with the test leads.

Precise Measurement for Earth Resistance

(Precise Measurement Method, Three-pole Method)

CAUTION

• To prevent cable damage, do not step on cables or pinch them between other objects. Do not bend or pull on cables at their base.

• The ends of the auxiliary earthing rod are sharp. Be careful to avoid injury.

• To ensure safe operation, use only the accessory cables.

• The cable is hardened under the 0 degree or colder environment. Do not bend or pull it to avoid tearing its shield or cutting cable.

• If the cable melts, the metal part may be exposed and can pose a hazard. Do not touch the area that is generating heat.

Red

Yellow

Black

Auxiliary Earthing Electrode H

10 m 10 m

Auxiliary Earthing Electrode S

Earthing Electrode E

Precise Measurement for Earth Resistance (Precise Measurement Method, Three-pole Method)

Use the measurement cable (black)

to connect between earthing electrode and E terminal.

Carry two winders along to the

measuring location while pulling out the measurement cables.

At the location where the

measurement cable (yellow) has been fully pulled out, insert the auxiliary earthing rod into the ground and connect the measurement cable (yellow).

Carry the winder (measurement

cable: red) along the straight line to a further distance between the earthing electrode E and auxiliary earthing electrode S while pulling out the measurement cable.

At the location where the

measurement cable (red) has been fully pulled out, insert the auxiliary earthing rod into the ground and connect the measurement cable (red).

• Insert the auxiliary earthing rods into a moist layer in the ground. Since this device can accept a large resistance of auxiliary earthing electrode, the auxiliary earthing rods do not need to be inserted unnecessarily deep into the ground.

• For accurate measurement, the distance between E-S-H needs to be approx. 5 m. The measurement cables (yellow) and (red) should be positioned approx. 10 cm away from each other. Make sure the cables do not tangle or overlap together.

Precise Measurement for Earth Resistance

(Precise Measurement Method, Three-pole Method)

Measuring earth resistance

Press the button to turn it on.

2 1

When NOISE Appears

If the earth potential is high (10 V rms or 14.3 Vpk or higher),

and the earth potential peak value appears on the display. When is on, or when (live wire warning indicator) is blinking, it is not possible to measure earth resistance.

Since leak current is ﬂ owing into the earthing electrode, ﬁ rst disconnect any electric equipment connected to the earthing electrode and then press MEASURE button again.

Press Fn button to display

(three-pole method).

Earth potential appears on the display.

Press MEASURE button so that the

device automatically executes the earth potential check→auxiliary earth resistance check→earth resistance measurement in sequence.

The measurements will be completed in approx. 8 seconds, and then the measured value appears and

Check the measured value.

lights up.

Precise Measurement for Earth Resistance (Precise Measurement Method, Three-pole Method)

• This device automatically detects AC/DC ( / ) of the

earth potential. If AC/DC needs to be switched, it can be switched by pressing

DISPLAY button while the current earth potential has been

displayed.

• To check earth potential After measurement of earth resistance, press DISPLAY button while is lit up so that the earth potential will be displayed. When is lit up, press Fn button so that the retained value is unlocked and the current earth potential will be displayed.

When OPEN Appears

This device automatically check whether or not each earth resistance is within the allowable range by measuring the earth resistance of the auxiliary earthing rod prior to measuring the resistance of the earthing electrode E. If the earth resistance of the auxiliary earthing electrode exceeds the allowable range, OPEN appears below the measurement terminal that exceeds the allowable range and the earth resistance of the earthing electrode E will not be measured.

Countermeasures when OPEN appears

Take the following actions for the auxiliary earthing rod connected with the measurement terminal for which OPEN appears.

• Pour water

• Stick in deeper

• Insert the auxiliary earthing rod into another location

• If the clip connecting point is dirty, wipe and clean the auxiliary earthing rod with a soft cloth.

Precise Measurement for Earth Resistance

(Precise Measurement Method, Three-pole Method)

DISPLAY button allows to display the earth resistance and earth

potential of each earthing electrode.

Earth resistance of earthing electrode E

Earth resistance of auxiliary earthing electrode S

Earth resistance of auxiliary earthing electrode H

Earth potential

When the resistance (RH) of auxiliary earthing electrode exceeds 5 kΩ, the display range becomes the range of 200 Ω without displaying the digit of 0.01 Ω even though the resistance of earthing electrode is 20 Ω or less. The following table shows examples. If the digit of 0.01 Ω is required, pour some water over the auxiliary earthing rod (H) to reduce the earth resistance to 5 kΩ or less.

Resistance RH of

auxiliary earthing

electrode H

0 to 5 k

to 50 k

5 k

Example of indicated

value (1)

When 9.52

measured

9.52 Ω (Range: 20 Ω) 13.48 Ω (Range: 20 Ω)

9.5 Ω (Range: 200 Ω) 13.5 Ω (Range: 200 Ω)

Example of indicated

value (2)

When 13.48

measured

Precise Measurement for Earth Resistance (Precise Measurement Method, Three-pole Method)

Stowing

Press the button to turn it off.

Remove the measurement

cables from the measurement terminals and ﬁ t the cover of the measurement terminal.

Remove the measurement cables

from the auxiliary earthing rods and pull out the auxiliary earthing rods without bending them.

(See p.54 for how to pull out.)

Rewind the measurement cables

(red, yellow) with the respective winders and stow the winders in the carrying case with the auxiliary earthing rods inserted into the winder's holders.

Remove the measurement cable

(black) from the earthing electrode and fold it, and then stow it into the carrying case. (p.20)

Always ﬁ t the cover of the measurement terminals immediately after use. Any foreign object entering the measurement terminal may cause a failure.

Precise Measurement for Earth Resistance

(Precise Measurement Method, Three-pole Method)

Measurement on concrete

Since concrete is conductive, auxiliary earthing electrodes can be installed on concrete. Place an auxiliary earthing rod on concrete and pour water over it, or cover the auxiliary earthing rod with a wet rag to form an auxiliary earthing electrode. If the earth resistance of the auxiliary earthing electrode is not reduced by the above methods, place the optional 9050 earth net on concrete and then position the auxiliary earthing rod on the earth net and pour water over it. Before measurement, allow some time for the water to well soak into the concrete. As an alternative to the earth net, a metal plate or aluminum foil etc. may be used. However, the earth net will provide better reduction in the earth resistance of auxiliary earthing electrode. Since asphalt is insulator, it is generally not possible to install the auxiliary earthing electrode on asphalt. However, measurement may be possible on asphalt that has water permeability.

9050 Earth Nets

Simpliﬁ ed Measurement for Earth Resistance (Simpliﬁ ed Measurement Method, Two-pole Method)

2.7 Simpliﬁ ed Measurement for Earth Resistance (Simpliﬁ ed Measurement Method, Two-pole Method)

DANGER

• Use the neutral side (ground side) of the commercial

power supply for this measurement. Prior to connection, use a voltage detector etc. to make sure that it is going to be connected with the neutral side and take caution for electric shock.

• This device can be connected to the neutral side of

an outlet with a voltage-to-ground of 300 V or less, or to the wire on the neutral side of the breaker's secondary side with a voltage-to-ground of 150 V or less. Do not connect with anything other than those speciﬁ ed above. It can be hazardous.

WARNING

• Use the optional test lead L9787 for simpliﬁ ed

measurement for safety. Connecting the measurement cables L9841, L9842-11, L9842-22, L9843-51 and L9843-52 to a commercial power supply may cause electric shock.

• This device can output a voltage of approx. 30 V.

Although the device has a dust-proof, jet-proof and water-proof structure, the device should always be dried before using it for measurement so as to avoid electric shock.

Simpliﬁ ed Measurement for Earth Resistance

(Simpliﬁ ed Measurement Method, Two-pole Method)

CAUTION

• When the device is set to two-pole method, even if it is connected to the earth side of a commercial power supply, it will not trigger the earth leakage breaker since the measurement current is suppressed to 4 mA or less. However, do not use this method for measurement at a location where an earth leakage breaker or leakage relay with the current sensitivity of less than 10 mA has been installed, since such an earth leakage breaker or leakage relay may be triggered.

• The simpliﬁ ed measurement function of this device is a function for measuring earth resistance with small inductance component. Therefore, a resister connected in series with inductance component of 3 mH or more may not be accurately measured.

• Removable sleeves are attached to the metal pins at the ends of the test leads. To prevent a short circuit accident, be sure to use the test leads with the sleeves attached when performing measurements in the CAT III measurement category. For the measurement categories, see “Measurement categories” (p.7).

• If the sleeves are inadvertently removed during measurement, stop the measurement.

• When carrying out measurements with the sleeves in place, be careful to avoid damaging the sleeves. If the cover cap accidentally comes off during measurement, it should be handled carefully to avoid electric shock.

• Since the tip of the metal pin is sharp, care needs to be taken to avoid injury.

• L9787 is a test lead speciﬁ cally designed for indoor use. Do not use it outdoor.

Simpliﬁ ed Measurement for Earth Resistance (Simpliﬁ ed Measurement Method, Two-pole Method)

Removing and attaching the sleeves of L9787 Test lead

• Removing the sleeves Gently hold the bottom of the sleeves and pull the sleeves off. Safely store the removed sleeves so as not to lose them.

• Attaching the sleeves Insert the metal pins of the test leads into the holes of the sleeves, and ﬁ rmly push them all the way in.

What is simpliﬁ ed measurement method (two-pole method)?

Simpliﬁ ed measurement method (two-pole method) is a measurement method to check the earth resistance of the equipment earthing with an earth system called TT method. In case of not being able to insert an auxiliary earthing rod, the earth resistance is obtained with use of an existing low earthing resistor as an auxiliary electrode. In this method, the measured value is the sum (Rx+Ro) of the earth resistances of the measuring object and existing earthing resistor, according to the measurement principle. Therefore, the earth resistance of the existing earthing resistor used needs to be lower than that of the earthing electrode of the measuring object.

In the simpliﬁ ed measurement method, the resistance of the earthing element used is added to the measurement result. It is very difﬁ cult to measure 10

or less in the simpliﬁ ed method.