KYORITSU 4120A User Manual

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INSTRUCTION MANUAL

DIGITAL PSC-LOOP TESTER

MODEL 4116A, 4118A, 4120A

KYORITSU ELECTRICAL INSTRUMENTS

WORKS LTD.

CONTENTS
1. SAFE TESTING ..............................................................................		1
2. PROCEDURE OF REMOVING COVER .........................................		3
3. FEATURES ......................................................................................		4
3.1	Instrument Layout ....................................................................	4
3.2	Test Lead ..................................................................................	5
3.3	Features ...................................................................................	5
4. SPECIFICATIONS ..........................................................................		7
5. OPERATING INSTRUCTIONS .......................................................		8
5.1	Initial Checks .............................................................................	8
5.2	Measurement of the Loop Impedance ......................................	9
5.3	Measurement of Prospective Short Circuit Current .................	10
6. DETAILED EXPLANATION ...........................................................		10
6.1	Measurement of Fault Loop Impedance and
	Prospective Fault Current .......................................................	10
6.2	Measurement of OLD-TT System ............................................	15
6.3	Measurement of Line Impedance and
	Prospective Short Circuit Current ............................................	16
7. SERVICING ...................................................................................		17
8. CASE AND STRAP BELT ASSEMBLY .........................................		17

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 contained in the instructions or with the safety procedures.

3.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.

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DANGER

●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

●Never open the instrument case - there are dangerous voltages present. If a fault develops, return the instrument to your distributor for inspection and repair.

●If the overheat symbol appears in the display () disconnect the 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 hand is wet.

CAUTION

●For those testers without the D-LOK circuitry (models 4116A, 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.

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2. PROCEDURE OF REMOVING COVER

Model 4116A, 4118A and 4120A 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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