Kyoritsu Electrical Instruments 6010A User manual

INSTRUCTION MANUAL

MULTI-FUNCTION TESTER

MODEL

KYORITSU ELECTRICAL INSTRUMENTS WORKS，LTD.

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6010A

CONTENTS

1．Safe Testing .................................................................................. 1

2．Features ........................................................................................ 3

3．Specification .................................................................................. 6

4．Continuity (resistance) tests .......................................................... 9

　4．1　　Instrument layout ................................................................. 9

　4．2　　Resistance of test leads ....................................................... 9

　4．3　　Continuity testing ............................................................... 10

5．Insulation Tests ........................................................................... 11

　5．1　　The nature of insulation resistance .................................... 11

　5．1．2　Capacitive current .............................................................. 11

　5．1．3　Conduction current ............................................................ 12

　5．1．4　Surface leakage current ..................................................... 12

　5．1．5　Total leakage current ......................................................... 13

　5．2　　Damage to voltage-sensitive equipment ............................ 13

　5．3　　Preparation for measurement ............................................ 14

　5．4　　Insulation resistance measurement ................................... 14

6． Loop Impedance Tests ............................................................... 17

　6．1　　Voltage measurement ........................................................ 17

　6．2　　What is earth fault loop impedance? ................................. 17

　6．3　　Automatic over-temperature cut-out .................................. 17

　6．4　　The loop impedance test ................................................... 18

　6．5　　Loop impedance at 3 phase equipment ............................. 19

7．RCD Tests ................................................................................... 21

　7．1　　Purpose of RCD Test ......................................................... 21

　7．2　　What does the RCD test really do? ................................... 21

　7．3　　RCD testing ....................................................................... 21

　7．4　　Testing RCDs used to provide supplementary protection .. 22

　7．5　　Testing time delayed RCDs ............................................... 22

8．General ....................................................................................... 23

9．Battery replacement .................................................................... 24

10．Fuse replacement ....................................................................... 24

11．Servicing ..................................................................................... 25

12．Case, strap and shoulder pad assembly ..................................... 26

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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.

● The symbol # on the instrument means that the user must refer to the

relevant section of this instruction manual for safe operation of the
instrument.

●

Pay particular attention to all WARNINGS and CAUTIONS in this instruction
manual.

WARNING indicates warnings to avoid electric shock and CAUTION indicates
cautions to avoid damage to the instrument.

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 non­compliance with the instructions or with the safety procedures.

2．

It is essential to read and to understand the safety rules contained in the
instructions. They must always be observed when using the instrument.

3．

This instrument is intended only for single phase operation at 230V AC ±
10% phase to earth or phase to neutral operation, and then only for loop
and RCD testing. For use in the continuity testing and insulation testing
modes this instrument

energised.

4．

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

5．

Never open the instrument case (except for fuse and battery replacement
and in this case disconnect all leads first) because dangerous voltages are
present. Only fully trained and competent electrical engineers should open
the case. If a fault develops, return the instrument to your distributor for
inspection and repair.

6． If the overheat symbol appears in the display ( ) disconnect the

instrument from the mains supply and allow to cool down.

7．

For loop impedance tests to prevent unwanted tripping during loop testing
all residual current devices RCD'smust be taken out of the circuit and
temporarily replaced with a suitably rated MCB unit. The RCD must be
replaced after the loop test is completed.

must be used ONLY on circuits which are de-

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8．

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.

9．

For safety reasons only use accessories (test leads, probes, fuses, cases,
etc) designed to be used with this instrument and recommended by
KYORITSU. The use of other accessories is prohibited as they are unlikely
to have the correct safety features.

10． When testing, always be sure to keep your fingers behind the safety

barriers on the test leads.

11．

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.

12．

The sliding shutter on the back of the instrument is a safety device. The
instrument should not be used if it is damaged or impaired in any way, but
returned to your distributor for attention.

13．

Do not operate the function selector whilst the instrument is connected to
a circuit. If, for example, the instrument has just completed a continuity
test and an insulation test is to follow, disconnect the test leads from the
circuit before moving the selector switch.

14．

Do not rotate function dial when test button is depressed. If the function
switch is inadvertently moved to a new function when the test button is
depressed or in lock-down position the test in progress will be halted. To
reset, release test button and press again to restart testing on new
function.

15．

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

16．

Before using the instrument, please insert the batteries rightly in
accordance with the "9. BATTERY REPLACEMENT" of page 24.

When not installing batteries, all the functions of the instrument don't
work.

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2. FEATURES

WIRING CHECK
LED

LCD DISPLAY

TEST BUTTON

CONNECTOR

FUNCTION SWITCH

LIVE CIRCUIT LED

RCD RATED TRIPPING
CURRENT SWITCH

Test Lead with IEC Connector

Fig １

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Test Lead for Continuity and Insulation Testing

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LCD DISPLAY

Model 6010A Multi-Function tester performs five functions in one instrument.

1．Continuity tester
2．Insulation resistance tester
3．Loop impedance tester
4．RCD tester
5． Mains voltage warning when operating the loop impedance and RCD

mode.

The tester is designed to Safety Standard IEC 61010-1
(300V).

Dust proof construction in conformance with IP50, IEC529.

The instrument is supplied with:
1．A KAMP10 lead for loop/RCD testing at socket outlets.
2．MODEL7122B lead for insulation and continuity testing.

In the insulation resistance testing mode the instrument provides a rated current
of 1mA as required in

In the continuity testing mode the instrument provides a short circuit current of
200mA as required in

Continuity and insulation resistance functions have the following features:-

Live circuit warning A colour coded LED warns if the circuit under

Auto discharge Electric charges stored in capacitive circuits

Test current Warning Beeper Warns when the test current exceeds

(IEC 61557-4) during continuity measurement.

IEC 61557-2／EN 61557-2 1997.

IEC 61557-4／EN 61557-4 1997.

-

test is live.

are discharged automatically after testing by
releasing the test button.

200mA

EN 61010-1 CAT III

／

Loop impedance and RCD testing functions have the following features:-

Voltage level In the loop impedance mode, supply voltage

is displayed when the instrument is connected
to the supply until the test button is pressed.

Wiring check Three LEDs indicate if the wiring of the circuit

under test is correct.

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Over temperature protection Detects overheating of the internal resistor

(used for loop and RCD tests) and of the
current control MOS FET (used for RCD
tests) displaying a warning symbol (
automatically halting further measurements.

Phase angle selector The test can be selected from either the

positive (0°) or from the negative (180°) half­cycle of voltage. This will prevent tripping of
some polarised RCDs when loop testing and
may give a more accurate reading when
testing RCDs.

Auto data hold Holds the displayed reading for a time after

the test is complete.

Auto power off Automatically switches the instrument off after

a period of approximately 1 minutes.

V-NE Monitoring Circuit Automatically aborts measurement when the

N-E voltage rises to 50V or greater on RCD
ranges.

Optional Accessory OMA DIEC distribution board or lighting circuit

test lead for LOOP／RCD testing.

) and

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3. SPECIFICATION

Measurement Specification

Continuity (to IEC61557-4)

Open Circuit
Voltage(DC)

Greater than 4V

Operating range(as in IEC61557) 20Ωrange：0.2Ω〜19.99Ω／200ΩRange：20Ω〜199.9Ω

Insulation Resistance (to IEC61557-2)

Open Circuit

Voltage (DC)

500V ＋20%−0%

Operating range(as in IEC61557) 20MΩ Range：0.5MΩ〜19.99MΩ／200MΩ Range：20MΩ〜100MΩ

Loop Impedance (to IEC61557-3)

Rated Voltage

(AC)

230V＋10%－15%

50Hz

Operating range(as in IEC61557) 20Ω Range：2Ω〜19.99Ω／2000Ω Range：100Ω〜1999Ω

Short Circuit

Current

Greater than

200mA

Rated Current Range Accuracy

1mA or greater

@ 500kΩ

Nominal Test

Current at 0Ω

External Loop

25A/10ms 20Ω

15mA/350ms max. 2000Ω

Range Accuracy

20/200Ω

Auto-Ranging

Up to 2Ω

Over 2Ω

20/200MΩ

Auto-Ranging

Range Accuracy

±(3%rdg+4dgt)
±(3%rdg+3dgt)

±(3% rdg +3dgt)

±(3%rdg +8dgt)
±(3%rdg +8dgt)

RCD testing (to IEC61557-6)

Function

RCD × 1/2

RCD × 1

FAST 150mA 50ms

Voltage Measurement

Rated Voltage Measuring Range Accuracy

100〜250V 50Hz 100〜250V 50Hz 3%rdg

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Rated Voltage

(AC)

230V＋10%－15%

50Hz

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Trip Current

Settings

10/30/100/300/

500mA

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Trip Current

Duration

2000ms

Accuracy

Trip Current:

－8% 〜－2%

Trip Current:

＋2% 〜＋8%

Trip Time

±(1%rdg+3dgt)

To prevent wrong connection of test leads and to maintain safety, the
dedicated terminals used for continuity and insulation tests are automatically
covered when using the terminals for loop impedance and RCD tests

Instrument dimensions 175 X 115 X 86mm
Instrument weight 780g including batteries.

Reference conditions Specifications are based on the following

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． DC power source: 12.0 V, ripple content 1%

or less

　6. Altitude: Up to 2000m

Battery type Eight R6 or LR6 batteries.
Low battery warning " " symbol appears in the display if the battery

voltage drops below 8V.

Maximum numbers of Approx. 700 times for use by continuity range or
measurements approx. 1000 times for use by insulation resistance

range.

Operating temperature 0 to +40℃ , relative humidity 80% or less, no
and humidity. condensation.
Storage temperature -10 to +50℃ , relative humidity 75% or less, no
and humidity condensation.

LED indication of

Illuminates if there is an alternating voltage of 20V

live circuit warning

LED indication of correct

The P-E and P-N LEDs illuminate when the wiring

Polarity

Auto data hold In the loop impedance and RCD test functions, the

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

AC or more in the circuit under test before
continuity or insulation resistance tests. When DC
voltage is detected across the measuring terminal
the LED lights up.

of the circuit under test is correct. The
lamp is lit when P and N are reversed.

LCD reading is automatically frozen for 5 seconds
after measurement.

decimal point and units of measurement (Ω, MΩ,
V and ms) relative to selected function. The display

reverse

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is updated approximately five times per second.

Overload protection The continuity test circuit is protected by a 0.5 A

600 V fast acting（HRC）ceramic fuse mounted in
the battery compartment, where a spare fuse is
also stored.

The insulation resistance test circuit is protected by

a resistor against 600 V AC for 10 seconds.

Mains Voltage Indication On connecting test leads to the circuit under test

on Loop and RCD ranges, the LCD reads V-PE.
Sign "V-PE Lo" or "V-PE Hi" is also shown when
the voltage is 100V or less, or 260V or greater
respectively.

Symbols used on the
instrument

Equipment protected throughout by DOUBLE



INSULATION or REINFORCED INSULATION.

Caution, risk of electric shock.
# Caution（refer to accompanying instruction

manual）

.

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4. CONTINUITY（RESISTANCE）TESTS

　 # WARNING

　ENSURE THAT CIRCUITS TO BE TESTED ARE NOT LIVE.

DISCONNECT THE INSTRUMENT FROM THE CIRCUIT UNDER TEST
BEFORE OPERATING THE FUNCTION SWITCH.

TO SELECT THE LOW RESISTANCE RANGE SELECT“CONTINUITY”

4．1　Instrument layout See Fig 1.

4．2　Resistance of test leads

The object of testing is to measure the resistance of parts of the wiring system
alone,and this should not include the resistance of any test leads used.The
procedure is to measure the resistance of the test leads and to subtract this
from the instrument reading which includes the lead resistance.Proceed as
follows:-

Fig 2

1．Press the test button once. Then, the instrument switches on.
2． Connect the ends of the test leads in use firmly together（see Fig ２）and

operate the test button.

3． The display will read the resistance of the test leads,and a careful note

should be made of the reading.

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4．3　Continuity testing





Fig 3

1．Press the test button once. Then, the instrument switches on.
2．Select the continuity test by rotating the function dial.
3． Connect the test leads to the circuit whose resistance is required（see Fig

３）HAVING FIRST MADE SURE THAT THE CIRCUIT IS NOT LIVE.

Note that the live circuit warning lamp will illuminate if the circuit is live

-

but

check first anyway!

4．Press the test button and read the circuit resistance from the display.
5． Note that if the circuit resistance is greater than 20 Ω the instrument will

autorange to the 200 Ω range.

6． Subtract the test lead resistance（measured in 4.2 above）from the

display reading.

7． The result will be the resistance of the circuit under test.

Note： If the reading is greater than 200Ω the over range symbol "OL" will

remain displayed.

　　　 The results of measurements can be adversely affected by impedances

of additional operating circuits connected in parallel or by transient
currents.

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5. INSULATION TESTS

　 # WARNING

　ENSURE THAT CIRCUITS TO BE TESTED ARE NOT LIVE.

DISCONNECT THE INSTRUMENT FROM THE CIRCUIT UNDER TEST
BEFORE OPERATING THE FUNCTION SWITCH.

TO SELECT THE INSULATION RESISTANCE RANGE SELECT

“INSULATION”

5．1　The nature of insulation resistance

Live conductors are separated from each other and from earth metal by
insulation, which has a resistance which is high enough to ensure that the
current between conductors and to earth is kept at an acceptably low level.
Ideally insulation resistance is infinite and no current should be able to flow
through it. In practice, there will normally be a current between live conductors
and to earth, and this is known as leakage current. This current is made up of
three components, which are:-

1. capacitive current

2. conduction current, and

3. surface leakage current.

5．1．2　Capacitive Current

The insulation between conductors which have a potential difference between
them behaves as the dielectric of a capacitor, the conductors acting as the
capacitor plates. When a direct voltage is applied to the conductors, a charging
current will flow to the system which will die away to zero (usually in less than
a second) when the effective capacitor becomes charged. This charge must be
removed from the system at the end of the test, a function which is
automatically performed by Model 6010A. If an alternating voltage is applied
between the conductors, the system continuously charges and discharges as
the applied voltage alternates, so that there is a continuous alternating leakage
current flowing to the system.

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Fig 4

5．1．3　Conduction Current

Since the insulation resistance is not infinite, a small leakage current flows
through the insulation between conductors. Since Ohm's Law applies, the
leakage current can be calculated from

insulation resistance (MΩ)

5．1．4　Surface Leakage Current

Where insulation is removed, for the connection of conductors and so on,
current will flow across the surfaces of the insulation between the bare
conductors. The amount of leakage current depends on the condition of the
surfaces of the insulation between the conductors. If the surfaces are clean
and dry, the value of the leakage current will be very small. Where the
surfaces are wet and/or dirty, the surface leakage current may be significant. If
it becomes large enough, it may constitute a flashover between the conductors.
Whether this happens depends on the condition of the insulation surfaces and
on the applied voltage; this is why insulation tests are carried out at higher
voltages than those normally applying to the circuit concerned.

Leakage current (μA) =

　 applied voltage (V)

Fig 5

　　　　　　Fig 6

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5．1．5　Total Leakage Current

The total leakage current is the sum of the capacitive, conduction and surface
leakage current described above. Each of the currents, and hence the total
leakage current, is affected by factors such as ambient temperature, conductor
temperature, humidity and the applied voltage.
If the circuit has alternating voltage applied, the capacitive current (5.1.2) will
always be present and can never be eliminated. This is why a direct voltage is
used for insulation resistance measurement, the leakage current in this case
quickly falling to zero so that it has no effect on the measurement. A high
voltage is used because this will often break down poor insulation and cause
flashover due to surface leakage (see 5.1.4), thus showing up potential faults
which would not be present at lower levels. The insulation tester measures the
applied voltage level and the leakage current through the insulation. These
values are internally calculated to give the insulation resistance using the
expression:-

Leakage current (μA)

As the capacitance of the system charges up, so the charging current falls to
zero and a steady insulation resistance reading indicates that the capacitance
of the system is fully charged. The system is charged to the full test voltage,
and will be dangerous if left with this charge. Model 6010A provides an
automatic path for discharging current as soon as the test button is released to
ensure that the circuit under test is safely discharged.
If the wiring system is wet and/or dirty, the surface leakage component of the
leakage current will be high, resulting in low insulation resistance reading. In
the case of a very large electrical installation, all the individual circuit insulation
resistances are effectively in parallel and the overall resistance reading will be
low. The greater the number of circuits connected in parallel the lower will be
the overall insulation resistance.

Insulation resistance (MΩ) = 　

Test voltage (V)

5．2

Damage to Voltage-Sensitive Equipment

An increasing number of electronic-based items of equipment are being
connected to electrical installations. The solid state circuits in such equipment
are likely to be damaged by the application of the levels of voltage used to test
insulation resistance. To prevent such damage, it is important that voltage­sensitive equipment is disconnected from the installation before the test is
carried out and reconnected again immediately afterwards. The devices which
may need to be disconnected before the test include:-

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◦ Electronic fluorescent starter switches
◦ Passive infra-red detectors (PIRs)
◦ Dimmer switches
◦ Touch switches
◦ Delay timers
◦ Power controllers
◦ Emergency lighting units
◦ Electronic RCDs
◦ Computers and printers
◦ Electronic point-of-sale terminals (cash registers)
◦ Any other device which includes electronic components.

Preparation for measurement

5．3

Before testing, always check the following:­1．The“low battery”Indication“
2．There is no visually obvious damage to the tester or to the test leads
3． Test the continuity of the test leads by switching to continuity test and

shorting out the lead ends. A high reading will indicate that there is a faulty
lead or that the fuse is blown.

MAKE SURE THAT THE CIRCUIT TO BE TESTED IS NOT LIVE.

4．

　 A

warning lamp is lit if the instrument is connected to a live circuit but test

the circuit as well!

”is not displayed

Insulation resistance measurement

5．4

Model 6010A has a single test voltage of 500V DC.
1．Press the test button once. Then, the instrument switches on.
2． Select the insulation resistance setting by rotating the function dial to

“insulation”test section of the functional switch, after making sure that the

instrument is not connected to a live circuit.

3． Attach the test leads to the instrument and to the circuit or the appliance

under test (see Figs 7 & 8)

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



Fig 7

4． If the mains warning lamp lights and/or the buzzer sounds DO NOT PRESS

THE TEST BUTTON but disconnect the instrument from the circuit. Make
the circuit dead before proceeding.





Fig 8

5． Press the test button when the display will show the insulation resistance of

the circuit or the appliance to which the instrument is connected.

6． Note that if the circuit resistance is greater than 20MΩthe instrument will

automatically range to the 200MΩreading.

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7． When testing is complete release the test button BEFORE disconnecting

the test leads from the circuit or from the appliance. This will ensure that
the charge built up by the circuit or the appliance during insulation test is
dissipated in the discharge circuit. In the discharging process, an LED
illuminates and the live circuit warning buzzer will sound.

# CAUTION
NEVER TURN THE FUNCTION DIAL WHILST THE TEST BUTTON
IS DEPRESSED AS THIS MAY DAMAGE THE INSTRUMENT.
NEVER TOUCH THE CIRCUIT, TEST LEAD TIPS OR THE
APPLIANCE UNDER TEST DURING INSULATION TESTING.

Note： If the reading measured greater than 200MΩ the over range reading

“OL”will be displayed.

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○ 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.

6. LOOP IMPEDANCE TESTS

DISCONNECT THE INSTRUMENT FROM THE CIRCUIT UNDER TEST
BEFORE OPERATING THE FUNCTION SWITCH

TO SELECT THE LOOP TESTING RANGE SELECT“LOOP”

6.1　Voltage Measurement

Press the test button once. Then, the instrument switches on.When the tester
is set to the loop test function, mains voltage is displayed as soon as the
instrument is connected for test. This voltage display is automatically updated
five times every second. The voltage function operates whenever the test
button is in the up position.

6.2　What is earth fault loop impedance?

The path followed by fault current as a result of a low impedance fault
occurring between the phase conductor and earth is called earth fault loop.
Fault current is driven round the loop by the supply voltage, the amount of
current depending on the voltage of the supply and on the impedance of the
loop. The higher the impedance, the lower will be the fault current and the
longer it will take for the circuit protection (fuse or circuit breaker) to operate
and interrupt the fault.
To make sure that fuses will blow or that circuit breakers will operate quickly
enough in the event of a fault, the loop impedance must be low, the actual
maximum value depending on the characteristics of the fuse or the circuit
breaker concerned. Every circuit must be tested to make sure that the actual
loop impedance does not exceed that specified for the protective device
concerned.

Automatic over-temperature cut-out

6.3

During the short test period the instrument dissipates power of about 6 kW. If
frequent tests are conducted over a prolonged period of time, the internal test

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resistor will overheat. When this happens, further tests are automatically
inhibited and the over-temperature symbol (
instrument must then be left to cool down, when testing may be resumed.

6.4

The loop impedance test

Since the earth fault loop is made up of conducting path which includes the
supply system back to the supply transformer, it follows that loop testing can
only be carried out after the mains supply has been connected. In many cases,
any RCD in the circuit will be tripped by this test, which draws current from the
phase and returns it through the earth system. The RCD will see this as the
type of fault it is designed to protect against, and will trip. To prevent this
unwanted RCD tripping during loop testing, any RCD must be taken out of
circuit and temporarily replaced with a suitably rated MCB unit. The RCD will
need to be replaced after the loop test is completed.

) appears in the display. The

# WARNING
DO NOT PROCEED WITH TESTING UNLESS THE P-E AND P-N
LAMPS ARE LIT TO CONFIRM THAT THE WIRING IS CORRECTLY
CONNECTED. Should these two lamps not be lit, investigate the
wiring connections of the installation and rectify any faults before

proceeding with the test. If the

LED is lit do not proceed.

1．Press the test button once. Then, the instrument switches on.
2．Set the instrument to loop test 20Ωrange.
3． If testing sockets, connect the plug lead to the Model 6010A and push the

moulded plug into the socket to be tested (see Fig 9).

4．Check the wiring lamps are lit (see above).
5．Note the mains voltage displayed by the instrument.
6． Press the“Press to test”button. The value of the measured loop

impedance will be displayed with the appropriate units.

7． If testing lighting or other circuits, connect the three-wire lead OMA DIEC to

Model 6010A, connect the red (phase) lead to the phase connection of the
circuit under test, connect the black (neutral) lead to the neutral connection
of the circuit under test, and connect the earth lead to the earth associated
with the circuit. (see Fig 10).

8． If any RCD associated with the circuit trips out, reset the RCD and try

testing again, this time operating the phase selector switch once prior to
pressing the test button. This will change the period of the waveform over

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which the instrument performs the loop test. This may result in the RCD not
tripping out. If the RCD still trips, temporarily replace it with a suitably rated
MCB for the duration of the test.

9． If the instrument measures greater than 20Ωthe over-range symbol“OL”

will be displayed. If this is the case, switch the instrument up a range to the
2000 Ω range and repeat the test to obtain a satisfactory reading. If the

instrument is set to the "loop2000Ω"position,the test will be carried out at

the reduced current of 15mA flowing.This setting will be very unlikely to trip
out the circuit RCD.

Note：Do not connect phase to phase as this instrument is rated at 230V.

6.5

Loop impedance at 3 phase equipment

Use the same procedure as in 6.4 above ensuring that only one phase is
connected at a time i.e.： First Test: red prod to phase 1, black prod to neutral,
　　　　green crocodile clip to earth.
　　 Second Test: red prod to phase 2, black prod to

neutral, green crocodile clip to earth etc.

WARNING： NEVER CONNECT THE INSTRUMENT TO

#

TWO PHASES AT THE SAME TIME.

Testing as described in 6.4 and 6.5 above will measure the Phase-Earth loop
impedance. If you wish to measure the Phase-Neutral loop impedance then
the same procedure should be followed except the earth clip should be
connected to the neutral of the system i.e.: the same point as the black neutral
probe.
If the system has no neutral then you must connect the black neutral probe to
the earth i.e.: the same point as the green earth clip. This will only work if there
is no RCD in this type of system.

Note： Before commencing the test, please clearly eliminate the load which

remains in the circuit to be tested, otherwise it may affect the accuracy
of the measurement.

　　　 When the mains voltage is lower than 100V, the "low voltage" indication

"Lo" is displayed in the LCD display. Also, when the mains voltage is
higher than 260V, the "high voltage" indication "Hi" is displayed in the
LCD display.In either case, testing cannot be carried out as the test
button does not function even if you press it .

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BLACK NEUTRAL

Fig 9

RED PHASE

GREEN EARTH

Fig 10

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7. RCD TESTS

DISCONNECT THE INSTRUMENT FROM THE CIRCUIT UNDER TEST
BEFORE OPERATING THE FUNCTION SWITCH

TO SELECT THE RCD TEST RANGE SELECT“RCD”

7.1　Purpose of the RCD test

The RCD must be tested to ensure that operation takes place quickly enough
to ensure that there is unlikely to be serious danger to a person experiencing
an electric shock from the system. This test must NOT be confused with that
taking place when the "test" button on the RCD is pressed; operation of the
test button simply trips the breaker to ensure that it is working, but does not
measure the time taken to break the circuit.

7.2　What does the RCD test really do?

The RCD is designed to trip out when the difference between the phase
current and the neutral current (this is called the residual current) reaches the
tripping value (or rating) of the device. The tester provides a carefully preset
value of residual current depending on its setting and then measures the time
lapse between the application of the current and the operation of the RCD.

7.3　RCD testing

1．Press the test button once. Then, the instrument switches on.

2．Set the RCD rated tripping switch to the trip rating of the RCD under test.

3． Set the function switch to X1/2 for the "no trip" test, which ensures that the

RCD is operating within its specification and is not too sensitive.

4．Set the "LOOP/RCD" switch to 0°

5． Connect the instrument to the RCD to be tested either via a suitable

socket outlet（see fig 9）or using the OMA DIEC test lead set（see fig
10）.

6． Make sure that the P-E and P-N wiring check lamps are lit and the wiring

incorrect
the wiring for a possible fault.

7． If the lamps are correctly lit, press the test button to apply half the rated

tripping current for 2000 ms, when the RCD should not trip. The PN and
PE LEDs should remain on indicating the RCD has not tripped.

8． Repeat the test with the "LOOP/RCD" switch at 180°

9． In the event of the RCD tripping, the trip time will be displayed, but the

RCD maybe faulty.

LED is not lit. If they are not, disconnect the tester and check

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10． Set the function switch to X1 for the“trip”test, which measures the time

taken for the RCD to trip with the set residual current.

11．Set the "LOOP/RCD" switch to 0°
12． Make sure that the P-E and P-N wiring check lamps are lit. If they are not,

disconnect the tester and check the wiring for a possible fault.

13． If the lamps are lit, press the test button to apply full rated tripping current

and the RCD should trip, the tripping time being shown on the display. If
the RCD has tripped the PN and PE LEDs should be off. Check this is so.

14． Repeat the test with the "LOOP/RCD" switch at 180
15． MAKE SURE TO KEEP CLEAR OF EARTHED METAL DURING THE

OPERATION OF THESE TESTS.

7.4　Testing RCDs used to provide supplementary protection. (FAST TRIP
TEST)

RCDs rated at 30 mA or less are sometimes used to provide extra protection
against electric shock. Such RCDs require a special test procedure as follows:­1．Set the "RCD"switch to "150 FAST".
2．Set the "LOOP/RCD" switch to 0°
3．Connect the test instrument to the RCD to be tested.
4． Make sure that the P-E and P-N wiring check lamps are lit. If they are not,

disconnect the tester and check the wiring for a possible fault.

5． If the lamps are lit, press the test button to apply a test current of 150mA

where the RCD should trip within 40ms, the tripping time being shown on
the display.

6． Repeat the test with the "LOOP/RCD" switch at 180°
7． MAKE SURE TO KEEP CLEAR OF EARTHED METAL DURING THE

OPERATION OF THIS TEST.

°

Testing time delayed RCDs

7.5

RCDs with a built-in time delay are used to ensure discrimination, that is, that
the correct RCD operates first. Testing is carried out in accordance with item

7.3 above, except that the displayed tripping times are likely to be longer than
those for a normal RCD. Since the maximum test time is longer, there may be
danger if earthed metal is touched during the test.

MAKE SURE TO KEEP CLEAR OF EARTHED METAL DURING THE
OPERATION OF THIS TEST.

Note： If the RCD does not trip the tester will supply the test current for a

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maximum of 2000ms on the X1/2 and X1 ranges. The fact that the RCD
has not tripped will be evident because the PN and PE LEDs will still be
on.
On RCD ranges, when the N-E voltage rises to 50V or greater, the
measurement is automatically suspended and "VNE Hi" is displayed in
the LCD display.
Leakage currents in the circuit following the RCD may influence the
measurements.The earth electrode resistance of a measuring circuit

with a probe shall not exceed 50Ω at 500mA range.

The potential fields of other earthing installations may influence the
measurement.When the mains voltage is lower than 100V, the "low
voltage" indication "Lo" is displayed in the LCD display. Also, when the
mains voltage is higher than 260V, the "high voltage" indication "Hi" is
displayed in the LCD display.In either case, testing cannot be carried
out as the test button does not function even if you press it .
When making a test with the range larger than the RCD rated tripping
current, it can happen that RCD trips and "no" is shown on the display.

8. GENERAL

The test button can be locked down for ease of use by pressing it and turning
clockwise. Do not forget to release test button by turning it anti-clockwise
before disconnecting the instrument from the test points. Failure to do so may
leave the tested circuit in a charged condition when carrying out insulation test.
The instrument is provided with a sliding cover to ensure that leads for testing
continuity and insulation resistance cannot be connected at the same time as
test leads for loop testing and RCD testing. If this sliding cover is damaged so
that it fails to perform its function, do not use the instrument and return it to
your distributor for attention.

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9. BATTERY REPLACEMENT

When the display shows the low battery indication, ( ), disconnect the test
leads from the instrument. Remove the battery cover and the batteries.
Replace with eight (8) new 1.5 V R6 or LR6 batteries, taking care to observe
correct polarity. Replace the battery cover.

Note: The instrument is sometimes powered on when connecting a battery.

But when the instrument isn't connected with the main power and the
test button is also not pressed, the instrument is automatically powered
off in about 1 minute.

10. FUSE REPLACEMENT

The continuity test circuit is protected by a 600V 0.5A HRC ceramic type fuse

of less than 1Ω resistance situated in the battery compartment, together with a

spare. If the instrument fails to operate in the continuity test mode, first
disconnect the test leads from the instrument. Next remove the battery cover,
take out the fuse and test its continuity with another continuity tester. If it has
failed, replace it with a spare, before refitting the battery cover. Do not forget to
obtain a new fuse and place it in the spare position.
If the instrument will not operate in the loop impedance and RCD modes, it
may be that the protective fuses fitted on the printed circuit board have blown.
If you suspect that the fuses have failed, return the instrument to your
distributor for service - do not attempt to replace the fuses yourself.

Fig 11

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11. SERVICING

If this tester should fail to operate correctly, return it to your distributor stating
the exact nature of the fault. Before returning the instrument ensure that:­1．The leads have been checked for continuity and signs of damage.
2． The continuity mode fuse (situated in the battery compartment) has been

checked.

3．The batteries are in good condition.

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.

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12.

CASE, STRAP AND SHOULDER PAD ASSEMBLY

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

① Pass the strap DOWN through

the first case lug,under the
case and UP through the other
lug.

② Side the sholder-pad onto the

strap.

③ Feed the strap DOWN through

the slots in the back of the
test-lead pouch.

Fig 12

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④ Pass the strap through the

buckle,adjust the strap for
length and secure.

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