Kyoritsu Electrical Instruments Works, Ltd. KEW 8343 User manual

Instruction Manual
SIGNAL SOURCE for
INTELLIGENT SOCKET TESTER
KEW 8343

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1. Safety precautions
This instrument has been designed, manufactured, and tested according
to IEC 61010: Safety requirements for Electronic measuring apparatus,
and delivered in the best condition after passing quality control tests.
This instruction manual contains warnings and safety rules which have to
be observed by the user to ensure safe operation of the instrument and
to maintain it in safe condition. Therefore, read through these operating
instructions before starting to use the instrument.
#WARNING
● Read through and understand the instructions contained in this manual
before starting to use the instrument.
● Keep the manual at hand to enable quick reference whenever necessary.
● This instrument is to be used only in its intended applications.
● Understand and follow all the safety instructions contained in the manual.
It is essential that the above instructions are adhered to. Failure to follow
the instructions may cause injury, instrument damage and/or damage
to the equipment under test. Kyoritsu is by no means liable for any damage
resulting from the instrument in contradiction to these cautionary notes.
The symbol #indicated on the instrument means that the user must refer
to the related parts in the manual for safe operation of the instrument. It
is essential to read the instructions wherever the symbol appears in the
manual.
#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 injury
or instrument damage.
#DANGER
● Use the instrument only as specified; otherwise, the protection supplied
by the instrument may be compromised and it can lead damage of
instrument or electrical shock.
● This instrument is rated to CAT III 300 V. (max. voltage to ground)
Do not test circuits which exceed this rating: circuits in which 300 V or
higher voltage to ground exists.
● Do not attempt to make measurements in the presence of flammable
gasses. Otherwise, the use of the instrument may cause sparking, which
can lead to an explosion.
● Do not apply inputs exceeding the maximum allowable range.
● Put insulated protective gears when there is a danger of electrical shock
hazard.

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#DANGER
● Never attempt to use the instrument if its surface or your hand is wet;
otherwise, electrical shock accident may occur.
● Do not make measurement when thunder is rumbling. If the instrument
is in use, stop the measurement immediately and remove the instrument
from the measured object.
●
Keep your fingers and hands behind the barrier on the test voltage injection
clamp and voltage detection cables to avoid possible shock hazards.
* Barrier is a part providing protection against electrical shock and
ensuring the minimum required air and creepage distances.
#WARNING
● Never attempt to make any measurement, if any abnormal conditions
such as crack or exposed metal parts are noted on the instrument or
voltage detection cable.
● Confirm a proper operation of the instrument with a well-known power
supply before starting to use the instrument.
● Do not install substitute parts or make any modification to the instrument.
Return the instrument to your local Kyoritsu distributor for repair or
re-calibration.
#CAUTION
● This instrument is not dust nor waterproof. Do not use the instrument
in dusty or water splashing places. It may cause malfunction of the
instrument.
● Do not step on nor pinch the cables so as not to damage their jackets.
● Do not pull nor bend the root of cable to prevent break in cable.
● Never give shocks, such as vibration or drop, during transportation or
operation which may damage the instrument.
● Power off the instrument after use. Remove batteries if the instrument is
to be stored and will not be used for a long period.
● Do not expose the instrument to direct sunlight, high temperature and
humidity, or dew fall.
● Use a damp cloth and neutral detergent for cleaning the instrument.
Do not use abrasives or solvents.
● Dry and store the instrument if it is wet.
CAUTION
● KEW 8343 is specially designed to KEW 4506, therefore, it cannot be used
with KEW 4500/ 4500BT/ 4505/ 4505BT.
● Use of this instrument is limited to domestic, commercial, and light
industry applications. Strong electromagnetic interference or strong
magnetic fields, generated by large currents, may cause malfunction of
the instrument.

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Measurement category
To ensure safe operation of measuring instruments, IEC 61010 establishes
safety standards for various electrical environments, categorized as CAT 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 (None, Other) : Circuits which are not directly connected to the mains power
supply.
CAT II : Primary 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 overcurrent protection
device (distribution panel).
O: Device which is
not directly
connected to the
mains power supply
Safety symbols
#
Refer to the instructions in the manual to protect the user and instrument.
Indicates instrument with double or reinforced insulation.
Indicates that this instrument can clamp on a bare conductor when
measuring a voltage corresponding to the applicable measurement
category, which is marked next to this symbol.
AC
(Functional) Earth
This instrument satisfies the marking requirement defined in the
WEEE Directive. This symbol indicates separate collection for
electrical and electronic equipment.

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2. Features
● This is a signal source device to be used with KEW 4506 (Socket tester)
and can test wiring connection and find miswiring.
● KEW 4506 identifies and compares the phases of test voltage applied via
KEW 8343 and of outlet. It is applicable to integrated earthing systems
with low resistances such as TN, building structure, and common earth
systems, and possible to check whether the outlet is correctly wired.
● KEW 8343 can test outlets in: Single-phase 2-Wire, Single-phase 3-Wire,
Three-phase 3-Wire 200 V (delta connection, L2(S) grounded), and Three-
phase 4-Wire systems.
● Current flows between N-E by applying test voltage is less than 1 µA;
therefore, it doesn’t trip RCDs.
● Designed to international safety standard IEC 61010-1/ -031/ -2-032
(CAT III 300V, Pollution degree 2)
3. Instrument layout
(1) Main unit
Live LED (Green)
Lights up when voltage detection cables
are correctly connected, and then test
voltage is applied via test voltage
injection clamp.
The LED doesn’t light up if the cables
aren’t connected or during a blackout.
If warning buzzer sounds, check if the
jaws are firmly closed.
Power button
A long press (1 sec. or longer)
powers on/ off KEW 8343.
Power LED (Green)
L
ights up when powering on the instrument. If the LED blinks,
replace batteries with new ones.
Fig.
3-1

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(2) Voltage detection cable and test voltage injection clamp
< Tip of voltage detection cable > (Alligator clip)
< Test voltage injection clamp >
* Barrier is a part providing protection against electrical shock
and ensuring the minimum required air and creepage distances.
Transformer jaws
Barrier
Cable
Fig. 3-3
Trigger
Barrier
Fig. 3-2
Cable
4. Getting started
Before starting to use KEW 8343, check the following points.
See “7. Battery replacement” in this manual and insert batteries.
(1) Hold down test button 1 sec. to power on KEW 8343.
A long press (1 sec. or longer) is required to power on the instrument for
safety purpose. A long press of test button is also required to power off
the instrument.
(2) Confirm that green power LED at lower middle part of KEW 8343 lights
up while the instrument is on.
Note
● Use of size AA Alkaline battery is recommended. Use of the other types
of battery may extremely shorten the applying time of test voltage.
Blinking POWER LED indicates that the battery level is extremely low.
To conduct further measurements, refer to “7. Battery replacement” and
replace batteries with new ones.

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5. Wiring system
#DANGER
● This instrument is rated to CAT III 300 V. (max. voltage to ground)
Do not test the circuits which exceed this rating: circuits in which 300 V
or higher voltage to ground exists.
● Keep your fingers and hands behind the barrier on the test voltage
injection clamp and voltage detection cables to avoid possible shock
hazards.
* Barrier is a part providing protection against electrical shock and
ensuring the minimum required air and creepage distances.
● Transformer jaws are designed so as not to short-circuit the object to be
tested, however, care should be taken when clamping an un-insulated
conductor to prevent an electrical short-circuit with transformer jaws.
● Be careful not to short-circuit a power line with the alligator clips of
voltage detection cables during a measurement. It may cause personal
injury.
● Do not touch the alligator clips of voltage detection cables.
#WARNING
● If any breaks or cracks are noted on the instrument or voltage detection
cables or exposed metal parts are noted, do not use the instrument.
#CAUTION
● Take sufficient care not to apply shock such as drop; otherwise, precisely
adjusted transformer jaws may be damaged.
● When a foreign substance is stuck in the transformer jaw tips or they
cannot close properly, the transformer jaws don’t fully close. In such
a case, don’t release the trigger suddenly or attempt to close the
transformer jaws by applying external force. Make sure that the jaws
close by themselves after removing the foreign substance or making
them free to move.
● If transformer jaws are frozen, do not attempt to open them.
● Do not step on nor pinch the cables so as not to damage their jackets.
● Do not pull nor bend the root of cable to prevent break in cable.

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Note
● KEW 8343 is designed for: Single-phase 2-Wire, Single-phase 3-Wire,
and Three-phase 3-Wire 200 V (delta connection, L2(S) grounded),
and Three-phase 4-Wire (commercial power supply) systems. This
instrument cannot be used for Three-phase 3-Wire 400 V system (wye
(Y) connection) since it doesn’t have a neutral wire.
KEW 8343 and KEW 4506 (Socket tester) cannot perform socket test if
they are connected to:
* a live phase and in which one voltage phase is different from other
phases in Three-phase 4-wire system (wye or delta connection).
That is, if you make connections as illustrated below (Fig. 5-2 and Fig.
5-3) for the wiring systems as Fig. 5-1 describes, correct measurement
result cannot be obtained.
Fig. 5-1
Fig. 5-2
Power source
KEW8343

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Fig. 5-3
Power source
KEW8343
● To apply test voltage correctly, check the maximum measurable
conductor size with reference to “8. Specifications” so that the jaws
close completely.
● As shown in Fig. 5-4, the phase of test voltage applied to a neutral
wire (N) changes 180-degree depending on the orientation of the test
voltage injection clamp.
KEW 4506 performs socket test based on the polarity (phase
difference) of the test voltage signal; therefore, if the orientation of test
voltage injection clamp is incorrect, KEW 4506 judges as [NE Reverse]
even if the tested socket outlet is correctly wired.
Fig. 5-4

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Note
● Do not connect multiple test voltage injection clamps to a conductor to
be tested; otherwise, test voltage cannot be applied to the conductor
properly. Only one test voltage injection clamp can be connected to
the conductor to be tested even if you perform socket test with multiple
KEW 4506 at the same time.
Fig. 5-5
● It is impossible to test ungrounding system (floating power
supply) which is mainly utilized in hospital, sound room, and UPS
(Uninterruptible Power Supply) because test voltage cannot be applied
to.
Fig. 5-6
KEW8343
P
ower source

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Note
● Socket test cannot be performed if a neutral wire (N) connected to
ground is closer to the outlet to be tested than the clamp position of
test voltage injection clamp.
Fig. 5-7
KEW8343
P
ower source

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Note
● Check the wiring diagram before making connections and identify the
branch circuit breaker to which the 3P outlet under test is wired, and
then connect the test voltage injection clamp close to the outlet to be
tested.
Depending on the orientation of the test voltage injection clamp, as
explained with Fig. 5-4 at the previous clause, KEW 4506 may judge as
[NE Reverse] even if the outlet is correctly wired as shown in Fig. 5-8
(outlet wired to branch circuit breaker [B]).
Connect the test voltage injection clamp to the appropriate neutral
wire (N) of the branch circuit breaker with the correct orientation and
location.
Fig. 5-8
Power source
Branch circuit breaker [B]
[NE Reverse]
Branch circuit breaker [A]
[correct]
Other branch circuit
breakers [NE Reverse]

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Note
● When the test voltage injection clamp is connected close to the
distribution board, KEW 4506 can test the outlet which is wired to branch
circuit breaker [B] shown in Fig. 5-8 and judge as “PASS” (correct);
however, it is NOT recommended to connect test voltage injection clamp
to the position shown in Fig. 5-9.
This is because KEW 4506 may show “ ” if multiple loads are
connected to an outlet wired from any of the other branch circuit
breakers, which is not the one to be tested, and where those loads are
active.
Fig. 5-9
Branch circuit breaker [B]
[correct]
Branch circuit breaker [A]
[correct]
Other branch circuit
breakers [correct]
Power source

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！To obtain accurate result:
● Clamp a conductor with test voltage injection clamp observing the
orientation shown below: arrow mark on the clamp shall be towards the
outlet. Ensure that the transformer jaws are firmly engaged and closed.
Fig. 5-10
Outlet side
Power source side
Arrow mark
Power on KEW 8343 and connect the test voltage injection clamp to the
appropriate location observing the correct orientation according to the wiring
configuration to be tested. Connect the black voltage detection cable to a
neutral wire (N) and the red voltage detection cable to hot (live) wire (L)
correctly. Confirm that the green live LED on the upper right of the front side
of the main unit lights up.
If the green live LED doesn’t light up, connection of voltage detection cords
might be incorrect. Please check the connection.
For your information, if voltage is less than 80 V, the live LED doesn’t light
up. If live LED blinks with audible warning, voltage detection cables may be
connected to over 280 V. Ensure that the cables are connected to the power
line rated to 280 V or less.

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(1) Single-phase 2-Wire
Clamp the neutral wire (N) with test voltage injection clamp and connect
the black voltage detection cable to neutral wire (N) and red voltage
detection cable to hot/live wire (L).
Fig. 5-11
P
ower source
KEW8343
R
ed
B
lack

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(2) Single-phase 3-Wire
Clamp the neutral wire (N) with test voltage injection clamp and connect
the black voltage detection cable to neutral wire (N) and red voltage
detection cable to hot/live wire (L): either L1 or L2 correctly. Then you can
test any 3P outlets which are connected to L1 or L2
Fig. 5-12
KEW8343
Power source
Black
Red

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(3) Three-phase 3-Wire 200 V (delta connection, L2(S) grounded)
Clamp the grounded L2(S) with the test voltage injection clamp and
connect the black voltage detection cable to L2(S) and red voltage
detection cable to a hot/live wire(L): either L1(R) or L3(T) correctly. Then
you can test any 3P outlets which are connected to L1(R) or L3(T).
Fig. 5-13
Power source
KEW8343
Black
Red

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(4) Three-phase 4-Wire
Clamp the neutral wire (N) with test voltage injection clamp and connect
the black voltage detection cable to neutral wire (N) and red voltage
detection cable to hot/live wire(L): either L1(R), L2(S), or L3(T) correctly.
Then you can test any 3P outlets which are connected to L1(R), L2(S), or
L3(T).
Fig. 5-14
Power source
KEW8343
Black
Red

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6. Test voltage injection
(1) Confirm the green LED (live indicator) at the upper right corner on the
unit lights up. When the LED lights up, injection of test voltage starts
automatically. If the indicator doesn’t light up, check the connection of
voltage detection cables.
(2) Ensure that the load current flowing through the clamped neutral wire (N)
is lower than the “load current flowing through neutral wire (N)” described
in “8. Specifications”. If the flowing current is higher than the specified
value, test voltage may not be injected correctly.
In this case, power off the connected load or disconnect the load and
then start the injection of test voltage.
(3) Confirm that power indicator (LED) is not blinking but stays on.
Note
● When buzzer keeps beeping:
- connection of test voltage injection clamp may not be correct, or
- 30 A or higher load current may be flowing through the clamped
neutral wire (N).
If buzzer is activated by high load current, buzzer keeps beeping but test
voltage is being correctly injected; therefore, it doesn’t affect the N-E
judgement of KEW 4506.
(4) Injection of test voltage stops and green live LED turns off when
disconnecting voltage detection cables.