Kyoritsu Electrical Instruments 4105A-H User manual

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CONTENTS

● Read through and understand instructions contained in this manual
before using the instrument.

● Save and keep the manual handy to enable quick reference whenever
necessary.

● Be sure to use the instrument only in its intended applications and to
follow measurement procedures described in the manual.

● Be sure to understand and follow all safety instructions contained in the
manual.

Be sure to observe the above rules strictly. Not following the instructions
may cause injury or instrument damage.
Kyoritsu is by no means liable for any damage resulting from the instrument
in contradiction to these cautionary notes.

○ The instrument is designed, manufactured, tested and shipped in prime

condition in accordance with the following standards.

● IEC 61010-1 Measurement CAT Ill 300V Pollution Degree 2

● IEC 61010-2-030

● IEC61010-031

● IEC61557-1,5

● IEC 60529 (IP54)

○ The symbol  on the instrument means that the user must refer to the

manual for safe operation of the instrument. There are three kinds of the
symbol . Read the instructions following each symbol carefully.

 WARNING

This instrucnon manual contains warnings and safety rules which must be
observed by the user to ensure safety operation of the instrument and to
retain it in safe condition. Therefore, read through these instructions before
using the instrument.

1. Safty Precautions

1. Safety Precautions ..................................................................................... 1

2. Features ..................................................................................................... 5

3. Specifications ............................................................................................. 6

4. Layout Diagram .......................................................................................... 9

5. Preparation for Measurement .................................................................. 10

5-1 Battery Voltage Check ....................................................................... 10

5-2 Connecting Test Probes .....................................................................10

6. Operating Instructions .............................................................................. 10

6-1 Principle of Measurement .................................................................. 10

6-2 Precise Measurement ........................................................................ 11

6-3 Simplified Measurement ..................................................................... 12

7. Battery Replacement ................................................................................ 15

8. Notes on Housing Case & Accessories ................................................... 16

8-1 Case Lid ............................................................................................ 16

8-2 How to Fit Strap Belt .......................................................................... 16

9. Cautions when using Test Leads .............................................................. 17

10. Before Sending for Service ..................................................................... 18

11. Service .................................................................................................... 19

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1. Safty Precautions

○ The instrument is designed, manufactured, tested and shipped in prime

condition in accordance with the following standards.

● IEC 61010-1 Measurement CAT Ill 300V Pollution Degree 2

● IEC 61010-2-030

● IEC61010-031

● IEC61557-1,5

● IEC 60529 (IP54)

This instrucnon manual contains warnings and safety rules which must be
observed by the user to ensure safety operation of the instrument and to
retain it in safe condition. Therefore, read through these instructions before
using the instrument.

● Read through and understand instructions contained in this manual
before using the instrument.

● Save and keep the manual handy to enable quick reference whenever
necessary.

● Be sure to use the instrument only in its intended applications and to
follow measurement procedures described in the manual.

● Be sure to understand and follow all safety instructions contained in the
manual.

Be sure to observe the above rules strictly. Not following the instructions
may cause injury or instrument damage.
Kyoritsu is by no means liable for any damage resulting from the instrument
in contradiction to these cautionary notes.

○ The symbol  on the instrument means that the user must refer to the
manual for safe operation of the instrument. There are three kinds of the
symbol . Read the instructions following each symbol carefully.

 WARNING

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 CAUTION

● Make sure that the test probe are securely connected to the terminal of
the instrument.

● Be sure to set the range selector switch to the OFF position after use.
When the instrument will not be in use for a long period of time, place it
in storage after removing the batteries.

● Do not expose the instrument to the direct sun, extreme temperature
and humidity or dew fall.

● Use a damp cloth soaked in water or neutral detergent for cleaning the
instrument. Do not use abrasives or solvents.

● When the instrument is wet, make sure to let it dry before putting it in
storage.

Symbols

The following symbols are used and marked on the instrument and in
the instruction manual. Please carefully check before starting to use the
instrument.

This instrument satisfies the marking requirement
defined in the WEEE Directive (2002/96/EC).
This symbol indicates separate collection for electrical
and electronic equipment.

Double or reinforced insulation

User must refer to the explanations in the instruction
manual.

Earth

 DANGER is reserved for conditions and actions that are likely to cause
serious or fatal injury.
 WARNING is reserved for conditions and actions that can cause
serious or fatal injury.
 CAUTION is reserved for conditions and actions that can cause minor
injury or instrument damage.

● Make sure that the range selector switch is set to a desired position
before making measurement.

● Do not make measurement in the presence of flammable gasses.
Otherwise, the use of the instrument may cause sparkling, which leads
to an explosion.

Never attempt to connect the test probe if the instrument or your hand is wet.

●

● Do not apply an electrical quantity exceeding the allowable limit of a

measuring range.

Never open the battery compartment cover while making measurement.

●

● The instrument should be used only in its intended applications or

conditions. Otherwise, safety functions equipped with the instrument
do not work, and instrument damage or serious personal injury may
be caused.

erify proper operation on a known source before use or take action as

● V
a result of the indication of the instrument.

Keep your fingers and hands behind the protective fingerguard during a

●

measurement.

● Never attempt to make measurement, if any abnormal conditions are

noted, such as broken case, cracked test probe and exposed metal parts.

● Never turn the range selector switch with test probe connected to the
equipment under test.

● Do not install substitute parts or make any decomposition or

modification to the instrument. Return the instrument to Kyoritsu or your

distributor for repair or re-calibration.

● Do not replace batteries when the surface of the instrument is wet.

● Always set the range switch to the OFF position before opening the

battery compartment cover for battery replacement.

● Stop using the test lead if the outer jacket is damaged and the inner
metal or color jacket is exposed.

 DANGER

 WARNING

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 CAUTION

● Make sure that the test probe are securely connected to the terminal of
the instrument.

● Be sure to set the range selector switch to the OFF position after use.
When the instrument will not be in use for a long period of time, place it
in storage after removing the batteries.

● Do not expose the instrument to the direct sun, extreme temperature
and humidity or dew fall.

● Use a damp cloth soaked in water or neutral detergent for cleaning the
instrument. Do not use abrasives or solvents.

● When the instrument is wet, make sure to let it dry before putting it in
storage.

Symbols

The following symbols are used and marked on the instrument and in
the instruction manual. Please carefully check before starting to use the
instrument.

Double or reinforced insulation

User must refer to the explanations in the instruction
manual.

Earth

This instrument satisfies the marking requirement
defined in the WEEE Directive (2002/96/EC).
This symbol indicates separate collection for electrical
and electronic equipment.

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2. Features

KEW 4105A is an earth resistance tester for testing power distribution
lines, in-house wiring system, electrical appliances etc. It also has an earth
voltage range for earth voltage measurement.

○ Designed to safety standard IEC 61557.

○ Dust and drip proof construction in conformity with IEC 60529 (IP54).

Measurement can be made even under adverse weather conditions.

○ Large, easy-to-read LCD digital display.

○ Simplified measurement probe has a structure that both the alligator clip

and the test bar are available.

○ Warns when earth resistance of auxiliary earth spikes exceeds the
permissible limit.

○ Convenient carrying soft bag for accessories etc.

Measurement Category

To ensure safe operation of measuring instruments, IEC 61010 establishes
safety standards for various electrical environments, categorized as O to
CAT IV, and called measurement categories. Higher-numbered categories
correspond to electrical environments with greater momentary energy, so
a measuring instrument designed for CAT III environments can endure
greater momentary energy than one designed for CAT II.

O : Circuits which are not directly connected to the mains power
supply.
CAT II : Electrical circuits of equipment connected to an AC electrical
outlet by a power cord.
CAT III : Primary electrical circuits of the equipment connected directly
to the distribution panel, and feeders from the distribution panel
to outlets.
CAT IV : The circuit from the service drop to the service entrance, and to
the power meter and primary over-current protection device
(distribution panel).

Incoming wire

CAT Ⅳ

Socket

Interior wiring

CAT Ⅲ

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CAT Ⅱ

O :Device which is
not directly
connected to the
mains power supply

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2. Features

KEW 4105A is an earth resistance tester for testing power distribution
lines, in-house wiring system, electrical appliances etc. It also has an earth
voltage range for earth voltage measurement.

○ Designed to safety standard IEC 61557.

○ Dust and drip proof construction in conformity with IEC 60529 (IP54).

Measurement can be made even under adverse weather conditions.

○ Large, easy-to-read LCD digital display.

○ Simplified measurement probe has a structure that both the alligator clip

and the test bar are available.

○ Warns when earth resistance of auxiliary earth spikes exceeds the
permissible limit.

○ Convenient carrying soft bag for accessories etc.

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Operating uncertainty

Operating uncertainty (B) is an uncertainty obtained under the rated
operating conditions, and calculated with the intrinsic uncertainty (A),
which is an error of the instrument used, and the error (En) due to variations.
According to IEC61557, the maximum operating uncertainty should be within ± 30%.
Operating uncertainty in earth resistance measurements (IEC61557-5)

○ The measuring range to keep operating uncertainty of ± 30%:

○

（ ））

lntrinsic uncertainty

Battery voltage

auxiliary earth

＋

E

2

2

E

3

2

＋ ＋

E

4

2

E

5

2

MODEL7127A･･･CAT III 600V (with Alligator Clip)
　　　　　　　　CAT II 600V (with flat test prod）

(Only the environment of CAT III or higher can be usedwith the alligator clip)
※When the instrument and the test lead are combined and used together,
whichever lower category either of them belongs to will be applied.

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Operating uncertainty

○

Operating uncertainty (B) is an uncertainty obtained under the rated
operating conditions, and calculated with the intrinsic uncertainty (A),
which is an error of the instrument used, and the error (En) due to variations.
According to IEC61557, the maximum operating uncertainty should be within ± 30%.
Operating uncertainty in earth resistance measurements (IEC61557-5)

2

2

2

E

E

（ ））

＋

2

3

E

＋ ＋

4

2

E

5

lntrinsic uncertainty

Battery voltage

auxiliary earth

○ The measuring range to keep operating uncertainty of ± 30%:

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12

12

⑫ Protective fingerguad

M-9121 Shoulder Strap

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⑫ Protective fingerguad

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Alligator clip Flat test bar

※1 Protective fingerguard

*1 Protective fingerguard is a part providing protection against electrical shock and
ensuring the minimum required air and creepage distances.

※1 Protective fingerguard

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7. Battery Replacement

 DANGER

 CAUTION

● Never attempt to open the battery compartment cover, if the outer
surface of the instrument is wet.

●

Never attempt to replace batteries while making measurement. To avoid

shock hazard, turn the instrument off and disconnect the test leads and

the probes from the instrument before opening the battery compartment

cover.

● Do not mix new and old batteries.

● lnstall batteries in the orientation as shown inside the battery

compartment, observing correct polarity.

① Turn off the instrument and disconnect the test probes from the
terminals.

② Loosen two screws on the bottom of the instrument and remove the
battery cover.
③ Always replace all six batteries in correct polarity.
Battery : R6P (AA dry battery) x6
④ Put the cover back in place and tighten the two screws.

② Earth Voltage Measurement
Set the range switch to EARTH VOLTAGE position in the condition of
①. Earth voltage will be indicated on the display. Make sure that the
voltage is 3 V or less.
When the display reads more than 3 V, it may result in excessive
errors in earth resistance measurement. To avoid this, make
measurement after reducing the voltage by turning off the power
supply of the equipment under test etc.

③ Simplified Measurement
Set the range switch to 2000Q position and press the test button. LED
remains illuminated during testing. Turn the range switch to 200Q and

20Ω when the earth resistance is low. This indicated value is the earth

resistance of the earthed equipment under test.

Note : ◇ If the auxiliary earth resistance of auxiliary earth spike C is too
high to make measurement, the display reads ' ... '. Recheck the
connection of each test lead and the earth resistance of auxiliary
earth spike.

④ Simplified Measurement Value
Two-terminal method is used for simplified measurement. In this
method, earth resistance value re of earth electrode connected to
terminal P is added to true earth resistance value Rx and shown as
an indicated value Re.
Re = Rx +re
If the re is known beforehand, true earth resistance value Rx is
calculated as follows.

Rx = Re

-

re

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7. Battery Replacement

 DANGER

● Never attempt to open the battery compartment cover, if the outer
surface of the instrument is wet.

●

Never attempt to replace batteries while making measurement. To avoid

shock hazard, turn the instrument off and disconnect the test leads and

the probes from the instrument before opening the battery compartment

cover.

● Do not mix new and old batteries.

● lnstall batteries in the orientation as shown inside the battery

compartment, observing correct polarity.

① Turn off the instrument and disconnect the test probes from the
terminals.

② Loosen two screws on the bottom of the instrument and remove the
battery cover.
③ Always replace all six batteries in correct polarity.
Battery : R6P (AA dry battery) x6
④ Put the cover back in place and tighten the two screws.

 CAUTION

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9. Cautions when using Test Leads

Do not connect the Precision Measurement Test Leads where electrical
potentials exceeding 33Vrms with peak value of 46V or DC70V.
Please use the Simplified Measurement Test Leads for voltage measure-
ments. The Alligator clips need to be attached and used under CAT III/
IV test environments and the Flat Test Bars are under CAT II test
environment.

Alligator clip

Flat Test Bar

Precision Measurement Test Leads MODEL 7095A

Simplified Measurement Test Leads MODEL 7127A

8. Notes on Housing Case & Accessories

8-1 Case Lid

Case lid can be fit under the housing case while making measurement.

8-2 How to Fit Strap Belt

The instrument is equipped with a strap belt to suspend from the neck to
allow both hands to be used freely for easy and safe operation

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9. Cautions when using Test Leads

Do not connect the Precision Measurement Test Leads where electrical
potentials exceeding 33Vrms with peak value of 46V or DC70V.
Please use the Simplified Measurement Test Leads for voltage measure­ments. The Alligator clips need to be attached and used under CAT III/
IV test environments and the Flat Test Bars are under CAT II test
environment.

Precision Measurement Test Leads MODEL 7095A

Alligator clip

Flat Test Bar

Simplified Measurement Test Leads MODEL 7127A

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11. Service

If this instrument should fail to operate correctly, return to your nearest
distributors stating the exact nature of the fault.

10. Before Sending for Service

If this instrument should fail to operate correctly, return it to your nearest
distributor stating the exact nature of the fault. Before returning the
instrument follow the trouble-shooting guide shown below.

● If the instrument does not turn on;
Check whether batteries are missing or they are installed incorrect
polarity. Note that batteries were not installed in the instrument at the time
of shipment.

● lf the display reads '1 ... ' in earth voltage measurement;
A voltage exceeding 200V is being applied to the instrument.
Halt the measurement immediately, otherwise the instrument may be
damaged.

● lf the display reads ' ... ' in normal earth resistance measurement;
Stick the auxiliary earth spikes deeper into the earth, or stick them at other
locations; or
Add moisture to the part of the earth where C auxiliary earth spike is stuck
( connected with the red wire ); and
Short the three test leads and check if the display indicates a value near
' 0.00 '. (See section 6 for details.)

● lf the display reads ' ... ' in simplified earth resistance measurement;
Check if the connection to a metal water pipe, a common earth of
commercial power supply, etc., is secure; or
Use another metal water pipe, common earth of commercial power
supply, etc.

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11. Service

If this instrument should fail to operate correctly, return to your nearest
distributors stating the exact nature of the fault.

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