Kyoritsu Electrical Instruments 4118A User manual

INSTRUCTION MANUAL

DIGITAL PSC-LOOP TESTER

MODEL 4118A

KYORITSU ELECTRICAL INSTRUMENTS

WORKS，LTD.

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CONTENTS

1. SAFE TESTING .................................................................................. 1

2. PROCEDURE OF REMOVING COVER ........................................... 4

3. FEATURES .......................................................................................... 5

　3.1 Instrument Layout ........................................................................ 5

　3.2 Test Lead ...................................................................................... 6

　3.3 Features ........................................................................................ 7

4. SPECIFICATIONS .............................................................................. 9

5. OPERATING INSTRUCTIONS ......................................................... 10

　5.1 Initial Checks ................................................................................ 10

　5.2 Measurement of the Loop Impedance ...................................... 11

　5.3 Measurement of Prospective Short Circuit Current .............. 12

6. DETAILED EXPLANATION ............................................................ 13

　6.1 Measurement of Fault Loop Impedance and

Prospective Fault Current ........................................................ 13

　6.2 Measurement of OLD-TT System .............................................. 18

　6.3 Measurement of Line Impedance and

Prospective Short Circuit Current .......................................... 19

7. SERVICING ................................................................................... 20

8. CASE AND STRAP BELT ASSEMBLY .......................................... 20

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1. SAFE TESTING

Electricity is dangerous and can cause injury and death. Always treat it
with the greatest of respect and care. If you are not quite sure how to
proceed, stop and take advice from a qualified person. This instruction
manual contains warnings and safety rules which must be observed by
the user to ensure safe operation of the instrument and retain it in safe
condition. Therefore, read through these operating instructions before
using the instrument.

IMPORTANT:

1. This instrument must only be used by a competent and trained
person and operated in strict accordance with the instructions.
KYORITSU will not accept liability for any damage or injury caused
by misuse or non-compliance with the instructions or with the safety
procedures.

2. It is essential to read and to understand the safety rules c
in the instructions or with the safety procedures.

3. The symbol
must refer to the related sections in the manual for safe operation of
the instrument. Be sure to carefully read instructions following each

symbol # in this manual.

DANGER

#

cause serious or fatal injury.

WARNING

#

serious or fatal injury.

CAUTION

#

minor injury or instrument damage.

indicated on the instrument means that the user

#

is reserved for conditions and actions that are likely to

is reserved for conditions and actions that can cause

is reserved for conditions and actions that can cause a

#

ontained

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DANGER

　 #

●　 The instrument is to be used only in its intended applications or
conditions. Otherwise, safety functions equ ip pe d with the
instrument will not work, and instrument damage or serious personal
injury may occur. Verify proper operation on a known source before
use or taking action as a result of the indication of the instrument.

● 　 This instrument is intended only for use in single phase operation at
230V +10% -15% AC phase to earth or for use in OLD-TT system
phase to neutral.

●　 When conducting tests do not touch any exposed metalwork
associated with the installation. Such metalwork may become live
for the duration of the test.

●　 When testing, always be sure to keep your fingers behind the safety
barriers on the test leads.

●　 Be sure to remove the test lead from the mains power supply
promptly after measurement. Do not leave the instrument connected
to the mains power supply for a long time.

WARNING

　 #

●　 The instrument is to be used only in its intended applications.
Understand and follow all the safety instructions contained in the
manual. Failure to follow the instructions may cause injury,
instrument damage and/or damage to equipment under test.
Kyoritsu is by no means liable for any damage resulting from the
instrument in contradiction to this cautionary note.

Never open the instrument case

● 　
present. If a fault develops, return the instrument to your distributor
for inspection and repair.

● 　 If the overheat symbol appears in the display (
instrument from the mains supply and allow to cool down.

● 　 If abnormal conditions of any sort are noted (such as a faulty
display, unexpected readings, broken case, cracked test leads, etc)
do not use the tester and return it to your distributor for repair.

● 　 Never attempt to use the instrument if the instrument or your
is wet.

- there are dangerous voltages

) disconnect the

hand

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CAUTION

　 #

● 　 For those testers without the D-LOK circuitry (models 4118A) all
RCD's (RCCB, ELCB) in the circuit must be by-passed for the
duration of the test (except on loop-2000Ω range).

　 Do not operate the RCD Test Button with the RCD by-passed.

● 　 During testing it is possible that there may be a momentary
degradation of the reading due to the presence of excessive
transients or discharges on the electrical system under test.
Should this be observed, the test must be repeated to obtain a
correct reading. If in doubt, contact your distributor.

● 　 Use a damp cloth and detergent for cleaning the instrument. Do
not use abrasives or solvents.

● Measurement categories(Over-voltage categories)

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

CAT III : Primary electrical circuits of the equipment connected directly to the

CAT IV : The circuit from the service drop to the service entrance, and to the

by a power cord.

distribution panel, and feeders from the distribution panel to outlets.

power meter and primary overcurrent protection device (distribution
panel).

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

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2. PROCEDURE OF REMOVING COVER

Model 4118A have a dedicated cover to protect against an impact
from the outside and prevent the operation part, the LCD and the
connector socket from becoming dirty. The cover can be detached
and put on the back side of the main body during measurement.

2.1 Method of removing the cover

Fig. 1

2.2 Method of housing the cover

Fig. 2

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3. FEATURES

3.1 Instrument Layout

⑤

①

②

Wiring correct

（Green LED's）

Reversed L/N terminals

（Red LED）

③

LCD

1............ LCD display

2............ Wiring check LEDs

3............ Test button

4............ Range switch

5............ Connector

DANGER

　 #

● 　 Use original test lead only.

● 　 Max. allowed voltage between mains test terminals and ground is
300V.

● 　 This instrument is intended only for use in single phase operation
at 230V +10% -15% AC phase to earth or for use in OLD-TT
system phase to neutral.

Fig. 3

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④

Connector

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3.2 Test Lead

The instrument is supplied with Model 7125 lead at socket outlets and Model
7121B distribution board lead.

(1) Model 7125

Mains lead mentioned in this instruction manual is Model 7125(EU)
European SCHUKO plug, however, there are some other types for the
areas, and the shipping is made along with the suitable plug-shaped
cable according to the areas of the globe as follows;
Model 7123 (AU) for Australian plug
Model 7124 (UK) for British plug (13A)
Model 7126 (SA) for South African plug

(2) Model 7121B

Black-Neutral

Red-Phase

Green-Earth

The loop impedance of this instrument is adjusted to show the true value by
using the attached mains lead (either of Models 7123 through 7126) prior
to the shipment.
However, when the attached test lead for distribution board Model 7121B
is used, the total internal resistance shows approx. 0.1Ω bigger than those
of other mains lead due to the internal fuse resistance. Therefore, when
measurement is taken by using the Model 7121B, the measured value
between PHASE-EARTH shows approx. 0.1Ω bigger than the true value.
PHASE make sure that 0.1Ω subtracted from the measured value leaves
the true value in case of using the test lead of this distribution board.
As for the PSC range, use the following equation and divide supply voltage
by loop impedance, therefore, the measured value shows smaller than the
true value contrary to the case of the case of loop impedance range.

● PSC(A) = Supply Voltage(V) / Loop Impedance(Ω)

Fig.4

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Choose and use the test leads and caps that are suitable for the
measurement category.
When the instrument and the test lead are combined and used together,
whichever lower category either of them belongs to will be applied.

Mechanical safety part:
Barrier: provides protection against electrical shock and ensuring the

minimum required air and creepage distances.

3.3 Features

3.3-1 Test Range (Function):

LOOP: 0-19.99Ω/0-199.9Ω/0-1999Ω
PSC: 0-199.9A/0-1999A/0-19.99kA

3.3-2 Applied Standards:

Instrument operation: IEC 61557-1, IEC61557-3
Safety: IEC 61010-1,2-030 CAT Ⅲ (300V) - instrument

IEC 61010-031 CAT Ⅲ (300V) - test lead

Protection degree: IEC60529 (IP 54)
EMC: IEC61326-1,-2-2

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3.3-3 Model 4118A have the following features:

● Battery is not used All models are not battery-operated, but operate by

● Wiring check Three LEDs indicate if the wiring of the circuit

● Over temperature
protection

● Overload protection Halts measurement to prevent damages to the body

● 15mA Loop
measurement

● Display The liquid crystal display has 3 1/2 digits with a

● Manual and Autotest mode

　 Manual －

　 Autotest － The "Press to Test" button can be turned clockwise to lock it

Press and release the "Press to Test" button. The result will be
displayed for 3s and then the display will revert to AC voltage.

down. In this auto mode, when using distribution board lead
M-7121B, tests are conducted by simply disconnecting and
reconnecting the red phase prod of the
the need to physically press the test button i.e. "hands
free".

the voltage supplied from the system.

under test is correct. The P-E and P-N LEDs
illuminate when the wiring polarity of the circuit
under test is correct.

Reverse LED is lit when P and N are

The
reversed.

Detects ove rheat ing of the internal resist or
displaying a warning symbol ( ) and automatically
halting further measurements.

when voltage between VL-PE is more than 260V.
"VL-PE Hi" is shown on the display.
Loop impedance 2000 Ω range measurement is

carried out with low test current (15mA). The
current will not cause tripping out involved RCD
even the one with the lowest nominal d
current (30mA).

decimal point and units of measurement (Ω, A,
kA,V).

M-7121B avoiding

ifferential

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4. SPECIFICATIONS

● Measurement Specification

Loop Impedance

Range

20 Ω
200 Ω
2000 Ω

Prospective Short-circuit Current

Range

200A
2000A
20kA

Voltage

Measuring range

0.00 〜 19.99 Ω

0.0 〜 199.9 Ω
0 〜 1999 Ω

Measuring range

0.0 〜 199.9A
0 〜 1999A

0.00 〜 19.99kA

Measuring range

110 〜 260V

Nominal test current
at 0 Ω external loop

25A / 20ms

2.3A / 40ms
15mA /280ms

Nominal test current
at 0 Ω external loop

2.3A / 40ms
25A / 20ms
25A / 20ms

Accuracy

± (2%rdg + 4dgt)

Accuracy

± (2%rdg + 4dgt)

Accuracy

Consider accuracy
of Loop Impedance

Test current: a half-sine wave

Instrument dimensions 186×167×89mm
Instrument weight

750g

Reference conditions Specif ications are based on the followi ng

conditions except where otherwise stated:
　1． Ambient temperature: 23 ± 5 ℃
　2． Relative humidity:45% to 75%
　3． Position: horizontal
　4． AC power source: 230V, 50Hz
　5． Altitude: Up to 2000m
Operating temperature 0 to +40℃ , relative humidity 85% or less, no
and humidity
Storage temperature －20 to +60℃ , relative humidity 85% or less, no

and humidity
Symbols used on the

instrument

condensation.

condensation.

Equipment protected throughout by DOUBLE



INSULATION or REINFORCED INSULATION.

Caution（refer to accompanying instruction

#

manual）

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●

Operating Instrumental Uncertainty of Loop Impedance (61557-3)

Range

20 Ω
200 Ω
2000 Ω

Th e inf lue nci ng v a ri ati ons u sed for c alc ula tin g the o per ati ng
instrumental uncertainty are denoted as follows:
Temperature：0℃ and 40℃
Phase angle ：At a phase angle 0゜to 18゜
System frequency：49.5Hz to 50.5Hz
System voltage：230V+10%-15%
Harmonics : 5% of
6% of 5th harmonic at 180° phase angle
5% of 7th harmonic at 0° phase angle
D.C quantity : 0.5% of the nominal voltage

5. OPERATING INSTRUCTIONS

Measuring range to keep
operating error

0.35 〜 19.99 Ω

20.0 〜 199.9 Ω
200 〜 1999 Ω

3rd harmonic at 0°p

Maximum percentage operating
instrumental uncertainty

± 30%

hase angle

5.1 Initial Checks - To be carried out
before any testing.

(1) Test Lead Connection
　 Insert t he lea d plug i nto the

co nnect or on the instru men t
correctly as shown below.

Fig. 5

　 #

Lead Plug

CAUTION

● 　 Always inspect your test instrument and lead accessories for
abnormality or damage. If abnormal conditions exist DO NOT
PROCEED WITH TESTING.

(2) Wiring Check
　 Before pressing the "Test Button" always check the LED's for the

following sequence:
　 P-E Green LED must be ON
　 P-N Green LED must be ON

Red LED must be OFF

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WARNING

　 #

● 　 If the above sequence is NOT displayed or the RED LED is on for
any reason , DO NOT PROCEED AS THERE IS INCORRECT
WIRING. The cause of the fault must be investigated and rectified.

●　 THE WIRING CHECK LED (P-E, P-N) of this instrument is to

protect the user from electrical shock resulting from incorrect
connection of Line and Neutral or Line and Earth.

　　 When the Neutral and Earth conductors are incorrectly wired, the

WIRING CHECK LED function cannot identify the incorrect
connection. Other procedures and test must be conducted to
check and confirm that the wiring is correct prior to making
measurement.

　　 Do not use this instrument to check the correct wiring of the

power supply. Kyoritsu will not be held liable for any accident that
may result from incorrect wiring of the power supply line.

(3) Voltage Measurement

When the instrument is first connected to the system, it will display the
phase-neutral voltage which is updated every 1s. This mode is cancelled
whenever the test button is pressed. If this voltage is not normal or as
expected, DO NOT PROCEED.

WARNING

　 #

● 　 If the above sequence is NOT displayed or the RED LED is on for
any reason , DO NOT PROCEED AS THERE IS INCORRECT
WIRING. The cause of the fault must be investigated and rectified.

5.2 Measurement of the Loop Impedance

(1) Set the instrument to the 200Ω or 2000Ω range.
　　 If the instrument is set to the 20Ω range slight sparking may occur

when testing with the distribution board lead although the unit has
been designed to minimize this.

(2) Connect the lead to the instrument.
　(3) Plug the moulded mains plug to the socket being tested.
　(4) Check the LED's are lit as indicated in section 5.1. If not DO NOT

PROCEED - check wiring.

　(5) Note the mains voltage if required.

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　(6) Press the "Press to Test" button. The value of loop impedance will

be displayed with the appropriate units. A bleep will sound on
completion of the test.

　　 For best results always test on the lowest possible range.

　　 For example, a loop impedance measured on the 200Ω range may

give an indication of 0.3Ω whereas on the 20Ω range it may read

0.28Ω. In the event of the reading being in excess of the range (e.g.
more than 20 Ω on the 20Ω range) the appropriate over-range
symbol "OL" will appear on the display.

　　 No harm will be done to the instrument by selecting too low a range.

　 # CAUTION

●　 Even though the test current in the 2000 ohm range (15mA test

current) is low some RCD's, may trip due to sensitivity or where
there may already be additional leakage in the circuit being
tested.

　　 The Loop impedance in a TN system is small and therefore it is

not recommended to test in the 2000 ohm range. RCD's will
have to be bridged to avoid tripping when using other test ranges.

● Meas

ured result may be influenced depending on the phase angle of
the distribution system when making measurement near a transformer
and the result may lower than the actual impedance value. Errors in
measured result are as follows.

System Phase

Difference

10° -1.5%
20° -6%
30° -13%

5.3 Measurement of Prospective Short Circuit Current

－ (Models 4118A)
　(1) Set the instrument to the 20kA range.
　(2) Connect the test lead to the instrument.
　(3) Attach the plug to the socket to be tested.

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Error

(approx.)

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　(4) Check that the LED's are lit in the sequence indicated in section 5.1.

If not, disconnect from the mains and check the wiring at the socket.

　(5) Press the "Press to Test" button. The prospective short circuit current

(PSC) will be directly displayed on the LCD with the appropriate units.
This will remain for 3s and then revert to AC voltage display.

　　 An audible beep will sound on completio

always test on the lowest possible range.

　　 For example a PSC measured on the 2000A range may read 60A

whilst on the 200A range it may read 56.0A. To hold the reading keep
the button held down or turn clockwise to lock for Auto Test.

Normally PSC tests are conducted at point of origin, e.g. distribution boards,
between phase and neutral.
When conducting PSC tests at socket outlets, a test will be conducted
between phase and earth due to the fixed wiring of the moulded mains plug.

WARNING

　 #

● 　 This instrument is intended only for use in single phase operation
at 230V +10% -15% AC phase to earth or for use in OLD-TT
system phase to neutral.

n of the test. For best results

6. DETAILED EXPLANATION

6.1

Measurement of Fault Loop Impedance and Prospective Fault Current

　 If the electrical installations are protected by over-current protection

devices or by fuses, the Fault loop impedance should be measured.

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　 In the event of a fault, the Fault loop impedance should be low enough

(and the Prospective Fault current higher enough) in order to have the
automatic disconnection of supply by the installed protection device within
prescribed time interval.

　 Every circuit must be tested to make sure that the fault loop impedance

does not exceed that specified for the over current protection device
concerned.

　 For TT system the Fault loop impedance is the sum of the following partial

impedances:
　◦ Impedance of power transformer's secondary.
　◦ Phase conductor resistance from power transformer to fault location.
　◦ Protection conductor resistance from fault location to local earth

system.
　◦ Resistance of local earth system R.
　◦ Resistance of power transformer's earth system Ro.

The figure below shows in marked line the Fault loop impedance for TT
system.

Fig.6

For TN system the Fault loop impedance is the sum of the following
partial impedances:
　◦ Impedance of power transformer's secondary
　◦ Phase conductor resistance from power transformer to fault location
　◦

Protection conductor resistance from fault location to power transformer

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The figure below shows in marked line the Fault loop impedance for TN
system.

Fig.7

According to the international Standard IEC 60364 for TT system the
following condition shall be fulfilled for each circuit:

＜

RA

50/Ia

Where:
　◦ RA is the sum of the resistances of the local earth system R and

protection conductor connecting it to the exposed conductive part.
　◦ 50 is the max contact voltage limit (it could be 25V in particular cases)
　◦ Ia is the current causing the automatic disconnection of the protective

device within 5 s.

When the protection device is a residual current device (RCD), Ia is the rated
residual operating current I ⊿ n.
For instance in a TT system protected by a RCD the max RA values are:

Rated residual operating current I ⊿ n.

RA (at 50V)105000
RA (at 25V)

2500

30

1667

833

100
500
250

300
167

83

500
100

50

1000

50
25

mA

Ω
Ω

　Note:

　　 ● The loop tester models 4118A measure the fault loop impedance

that is a value normally a little bit higher of RA.

　　 　 But, if the electrical installation is protected considering the loop

impedance value, also the RA formula will be fulfilled.

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Practical example of verification of the protection in a TT system according
to the international Standard IEC 60364.

Fig.8

For this example max value is 1667Ω, the loop tester reads 12.74Ω, it
means that the condition RA＜50/Ia is respected.
It is fundamental for this example to test also the RCD to ensure that
operation takes place quickly enough to respect the safety requirements. In
order to do it, can be used the RCD tester model 5406A.

According to the international Standard IEC 60364 for TN system the
following condition shall be fulfilled for each circuit:

Zs＜Uo/Ia

Where:
　◦ Zs is the Fault loop impedance.
　◦ Uo is the nominal voltage between phase to earth.
　◦ Ia is the current causing the automatic disconnection of the protective

device within the time stated in table as follows:

Uo (Volts)

120
230
400

>400

T (seconds)

0.8

0.4

0.2

0.1

　Note:

　　 ● For a distribution circuit a disconnection time not exceeding 5s is

permitted.

　　 ● When the protection device is a residual current device (RCD), Ia is

the rated residual operating current I⊿n.

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For instance in a TN system with nominal mains voltage Uo = 230 V
protected by gG fuses the Ia and max Zs values could be:

Rating

(A)

6
10
16
20
25
32
40
50
63
80

100

Disconnecting time 5s

Ia (A) Zs ( Ω ) Ia (A) Zs ( Ω )

28
46
65

85
110
150
190
250
320
425
580

Disconnecting time 0.4s

8.2
5

3.6

2.7

2.1

1.53

1.21

0.92

0.71

0.54

0.39

47

82
110
147
183
275
320
470
550
840

1020

4.9

2.8

2.1

1.56

1.25

0.83

0.72

0.49

0.42

0.27

0.22

Using the current ranges on models 4118A can be also tested the
Prospective Fault current.
Prospective Fault current measured by instruments must be higher than
Ia of the protective device concerned

Practical example of verification of the protection in a TN system according to
the international Standard IEC 60364.

Fig.9

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Max value of Zs for this example is 2.1Ω (16A gG fuse, 0.4s) the loop tester
reads 1.14 Ω (or 202 A on Fault current range) it means that the condition Zs

＜

Uo/Ia is respected.
In fact the Zs of 1.14Ω is less than 2.1Ω (or the Fault current of 202 A is
more than Ia of 110A).

WARNING

　 #

● 　 This instrument is intended only for use in single phase operation
at 230V +10% -15% AC phase to earth or for use in OLD-TT
system phase to neutral.

● 　 If the overheat symbol appears in the display (
instrument from the mains supply and allow to cool down.

6.2 Measurement of "OLD-TT System"

OLD-TT system is a TT system with phase to phase voltage of 220 V
(instead of 400 V) and phase to earth of 127 V (instead of 230V) and
normally the neutral conductor is not used.

Connecting the loop testers to this system, all three wiring check LEDs
should be lit and the display reads a value of 127 V.
Only if all these conditions are respected the test can be carry out.

) disconnect the

Fig.10

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WARNING

　 #

DO NOT PRESS

● 　

220V!

6.3

Measurement of Line Impedance and Prospective Short Circuit Current

Line Impedance on single-phase system is the impedance measured
between phase and neutral terminals.
Measurement principle used inside the instrument is exactly the same as at
Fault Loop Impedance measurement, but the measurement is carried out
between L and N terminals.

Breaking current capacity of installed over-current protection devices should
be higher than Prospective Short-Circuit current,
to change the rated current of involved over-current protection device.

Practical example of line impedance test and prospective short-circuit
current test:

The figure below shows in marked line the Line impedance phase to neutral
for TN system.

(OLD-TT system only)

the "Test button" if the display reads a value of

otherwise it is necessary

Fig.11

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WARNING

　 #

● 　 This instrument is intended only for use in single phase operation
at 230V +10% -15% AC phase to earth or for use in OLD-TT
system phase to neutral.

● 　 If the overheat symbol appears in the display ( 　 ) disconnect the
instrument from the mains supply and allow to cool down.

● 　 When testing installation that has a large current capacity, such as
a power line, be sure not to short live conductors with the tip of a
probe. Failure to follow these instruction can cause hazards to the
user.

7. SERVICING

If this tester should fail to operate correctly, return it to your distributor stating
the exact nature of the fault.
Please remember to give all the information possible concerning the nature
of the fault, as this will mean that the instrument will be serviced and
returned to you more quickly.

8. CASE AND STRAP BELT ASSEMBLY

Correct assembly is shown in Fig 12. By hanging the instrument round the
neck, both hands will be left free for testing.

Pas s th e st r a p be l t d o w n
through the side panel of the
main body from the top, and up
through the slots of the probe
case from the bottom.

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Fig.12

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Pass the strap through the
buckle, adjust the strap for
length and secure.

DISTRIBUTOR

92-2233

Kyoritsu reserves the rights to change specifications or designs
described in this manual without notice and without obligations.

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