Kyoritsu Electrical Instruments Works, Ltd. 4118A Manuel utilisateur

MODEL 4118A

DIGITAL PSC-LOOP TESTER

INSTRUCTION MANUAL

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 #

This instrument has been designed and tested according to IEC

Publication 61010: Safety Requirements for Electronic Measuring

Apparatus. 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 starting using the instrument.

WARNING

●　 Read through and understand instructions contained in this

manual before starting using the instrument.

●　 Save and keep the manual handy to enable quick reference

whenever necessary.

●　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.

The symbol

indicated on the instrument means that the user 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 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 a

minor injury or instrument damage.

—

DANGER

●　 The instrument is to be used only in its intended applications or

conditions. Otherwise, safety functions equipped 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.

●　

Do not exceed the maximum allowable input of any measurement range.

●　

Never attempt to use the instrument if its surface or your hand is wet.

●　 When conducting tests do not touch any exposed metalwork

associated with the installation. Such metalwork may become live

for the duration of the test.

●　 Keep your fingers and hands behind the protective fingerguard

during measurement.

●　 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.

●　 Do not attempt to make measurement in the presence of

flammable　gasses, fumes, vapor or dust. Otherwise, the use of

the instrument　may cause sparking, which can lead to an

explosion.

●　 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.

WARNING

●　 Do not turn the function selector switch with plugged in test leads

connected to the circuit under test

●　 Do not install substitute parts or make any modification to the　

instrument. Return the instrument to Kyoritsu or your distributor for　

repair or re-calibration.

● 　 If the overheat symbol appears in the display ( ) disconnect the

instrument from the mains supply and allow to cool down.

●　

Never attempt to make any measurement, if the instrument has any

structural abnormality such as cracked case and exposed metal part.

●　 Stop using the test lead if the outer jacket is damaged and the

inner metal or color jacket is exposed.

—

CAUTION

●　 Do not expose the instrument to the direct sun, extreme

temperatures or dew fall.

●　 Always make sure to insert each plug of the test leads fully into

the appropriate terminal on the instrument.

●　 This instrument isn't dust & water proofed. Keep away from dust

and water.

●　 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

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

—

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.

Fig. 2

2.1 Method of removing the cover

2.2 Method of housing the cover

Fig. 1

—

3. FEATURES

3.1 Instrument Layout

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

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

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

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

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

LCD Connector

Fig. 3

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.

①②

③④

⑤

Wiring correct

（Green LED's）

Reversed L/N terminals

（Red LED）

—

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

Protectiveﬁgerguard

Red-Phase

Green-Earth

Protectiveﬁgerguard

Fig.4

Protective figerguard:

It is a part providing protection against electrical shock and ensuring the

minimum required air and creepage distances.

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)

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

RoHS: EN50581

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3.3-3 Other Features:

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

the voltage supplied from the system.

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

under test is correct. The P-E and P-N LEDs

illuminate when the wiring polarity of the circuit

under test is correct.

The Reverse LED is lit when P and N are

reversed.

● Over temperature

protection

Detects overheating of the internal resistor

displaying a warning symbol ( ) and automatically

halting further measurements.

● Overload protection Halts measurement to prevent damages to the body

when voltage between VL-PE is more than 260V.

"VL-PE Hi" is shown on the display.

● 15mA Loop

measurement

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 differential

current (30mA).

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

decimal point and units of measurement (Ω, A,

kA,V).

● Manual and Autotest mode

　 Manual －

Press and release the "Press to Test" button. The result will be

displayed for 3s and then the display will revert to AC voltage.

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

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

M-7121B avoiding

the need to physically press the test button i.e. "hands

free".

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