KT71 /
POWERED BY
Portable Appliance
Tester
Instruction Manual
CONTENTS
1. Safe testing ………………………………………………………………… 1
2. Procedure of removing cover …………………………………………….. 3
2.1 Method of removing the cover ………………………………………... 3
2.2 Method of storing the cover …………………………………………... 3
3. Product summary and explanation ……………………………………… 4
3.1 Product summary …………………………………………………….... 4
3.2 Test function ……………………………………………………………. 5
3.3 Features ………………………………………………………………... 6
3.4 Instrument layout …………………………………………………….... 6
3.5 Explanation for indications ………………………………………….... 9
3.6 Applicable standards …………………………………………..…….. 10
4. Specification ………………………………………………………………. 11
4.1
General specification, measuring range and accuracy
4.2 Threshold and display ……………………………………………….. 12
4.3 Reference test condition …………………………………………….. 12
5. Preparation before a measurement …………………………………….. 13
5.1 Visual inspection ……………………………………………………… 13
5.2 Connection to main power supply ………………………………….. 13
5.2.1 Connection of mains cord ………………………………………. 13
5.2.2
5.2.3
5.2.4
Check the warning display of mains power voltage
Null setting (Protective conductor resistance function)
Voltage setting for insulation resistance measurement
………………… 11
………………… 14
………………... 14
………………... 16
6. Measuring method ……………………………………………………….. 17
6.1
Class I Test (Common function for both IT200mA and 20A)
6.2 Class I Test (Select the leakage current test) …………………….. 19
6.3 Class Ⅱ Test ………………………………...……………………….. 21
6.4 Class Ⅱ Test (Select the leakage current test) …………………... 23
6.5 Extension Leads Test ………………………………………………... 25
6.6 Leakage Current Test ………………………………………………... 27
7. Fuse replacement ………………………………………………………… 29
8. Case and strap assembly ………………………………………………... 30
9. Maintenance …………………………………………………..…………... 30
……………..… 17
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, then stop, take advice from a qualified person.
This instruction manual contains warning 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:
This instrument must only be used by a competent and trained person
and operated in strict accordance with these instructions.
KEWTECH will not accept liability for any damage or injury caused
by misuse or non-compliance with the instructions or with the safety
procedures.
It is essential to read and to understand the safety rules contained in
these instructions and with the safety procedures.
The symbol
to the related sections in the manual for safe operation of the instrument.
Be sure to carefully read instructions following each symbol
manual.
DANGER is reserved for conditions and actions that are likely
to cause serious or fatal injury.
indicated on the instrument means that the user must refer
in this
1 Safe Testing
WARNING is reserved for conditions and action s that can
cause serious or fatal injury.
CAUTION is reserved for conditions and actions that can cause
minor injury or instrument damage.
DANGER
●
This instrument can be connected only to the commercial
power of 230V+10%-10%, 50Hz.
●
For safety reasons, only use the Test Leads designed to be
used with this instrument and recommended by KEWTECH.
●Use only grounded mains outlets to supply the instrument.
Do not touch the devic e under test wh i lst testing is in
progress.
1
2
Safe Testing
DANGER
●
Since a high voltage of 500V is being output continuously,
wh en measuri ng insulat ion r esistan ce, t he user m ay get
an electrical shock. Any capacitors in the appliance under
test may become charged during testing and may contain
hazardous voltages do not touch them.
●
When testing, always be sure to keep your fingers behind the
safety barriers on the test leads.
●
Di scon nect the instr umen t from the powe r supp ly whe n
measurement is finished.
●
Do not lea ve t he i nstrument with connected to the power
supply.
WARNING
●Never open the instrument case – because dangerous voltages
are present. Only fully trained and competent electrical engineers
should open the case.
●
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 instrument and return it to your distributor
for inspection and repair.
●
Never attempt to use the instrument if the instrument or your
hands are wet.
CAUTION
● When using Test Leads with the crocodile clip, be sure to
check the crocodile clip is firmly connected to the metal part of
the device under test. Otherwise, inaccurate measurements or
arcing at the contacts may occur.
● The rated measuring voltage for the insulation test is 500V. DC.
If this voltage seems too high for the appliance under test
contact the appliance manufacturer for advice. The IEE Code
of Practice allows for a touch current test where an insulation
test cannot be carried out.
● When testing a faulty appliance, it may trip the circuit breaker
of main power supply during test and may cause interruption
of service. Be careful when the same main power supply is
used for PCs.
● We are not liable for loss of data on PC during testing with this
instrument. The appliance under test is powered on during
most tests, but please turn it to the OFF position after testing.
● Use a very slightly damp cloth for cleaning the instrument. Do
not use abrasives or solvents.
3
The KT71 has a dedicated cover to protect against an impact from the
outside and to prevent the fascia, 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 storing the cover
2 Procedure
of removing
cover
Fig.2
4
3 Product
summary and
explanation
3.1 Product summary
The KT71 is a hand-held portable appliance tester, performing four
functio ns to ensure the Safet y of Class I and Class II app lia nces.
Readings are displayed on a large liquid crystal display (LCD) below
which are four bicolour LEDs, which unambiguously display a pass or fail
indication for results dictated by the IEE Code of Practice.
This ins trument is s uitab le f or performing tes ts a s required b y the
following standard.
The IEE C ode of Practice for In-servi ce Inspection and Testing of
Electrical Equipment : 2003
This instrument is designed to check the electrical safety of appliances of
Class I and Class II categories.
As a guide the IEC standard define these two categories as follows:
Class I: Appliances which have a functional insulation throughout and
an earth connected case. These are often described as earthed
appliances.
Class II: Appliances which have both functional and additional insulation
wh ere any metal part s cann ot becom e Live und er fau lt
conditions.
5
3.2 Test Function
KT71 has the following features.
Function Tests of contents
● Pro tect ive cond ucto r res ista nce (Test
current 20A AC nominal)
Extension Lead Test
Class I Test IT200mA
● Insulation P/N-PE (Test voltage 250V DC
or 500V DC)
● Polarity (Test current 200mA DC nominal)
● Pro tect ive cond ucto r res ista nce (Test
current 200mA DC nominal)
● Insulation (Test voltage 250V DC or 500V
DC)
Product
summary and
explanation
Select Switch
+ Class I Test IT200mA
Class I Test 20A
Select Switch
+ Class I Test 20A
Class ll Test
Select Switch
+ Class II Test
Leakage Current Test
● Pro tect ive cond ucto r res ista nce (Test
current 200mA DC nominal)
●
Load current and leakage current test
● Pro tect ive cond ucto r res ista nce (Test
current 20A AC nominal)
● Insulation (Test voltage 250V DC or 500V
DC)
● Pro tect ive cond ucto r res ista nce (Test
current 20A AC nominal)
●
Load current and leakage current test
● Insulation (Test voltage 250V DC or 500V
DC)
Load current and leakage current test
●
● Load cur rent measureme nt (Maximum
appliance cu r r e n t 13A) an d le a k a g e
current test
6
Product
summary and
explanation
3.3 Features
● Check for whether the appliance is switched ON.
●
Selection for 250V or 500V on the insulation resistance test.
● Null function for the earth bond test lead.
● Warning for the over range value by the LCD.
● Capable of judging pass/fail of tests by LEDs on the panel and by a
buzzer.
3.4 Instrument layout
Fig.3
⑴ Test socket
Insert the mains plug of the appliance to be tested to this socket for
the protective conductor resistance, insulation resistance, leakage
current test and extension lead test.
⑵ Terminal block
Connect the supplied mains cord and Test Leads to this terminal block.
⑶ Terminal for mains lead
This terminal is connected to a mains supply via M-7209.
7
⑷ Terminal for Extension lead adaptor
For use with the KAMP S (UK) extension lead adaptor.
⑸ PE / Class II insulation probe
Connect the Test Lead with crocodile clip (M-7208) (fig 5) to this
terminal for the measurement of protective conductor resistance and
Class II insulation, and clip the metal parts of the appliance under test
with the crocodile clip.
⑹ LCD
Measured value is displayed
⑺ LED for test result
When the value of protective conductor resistance and insulation
resistance exceeds the limit dictated by applicable standards, LED
lights up in red. When it is within the limit, LED lights up in green.
⑻ Start/Stop switch
A measurement starts by pressing this switch.
Pressing the
stops the measurements.
⑼ NULL/250V-500V switch
● The rotary dial has to be set to a Class l test for this button to be
used to zero out the test lead resistance.
Start/Stop
switch again during a Leakage Current Test
Product
summary and
explanation
● The rotary dial has to be set to Class ll for this button to be used to
select either 250 V or 500V test voltage.
⑽ Function switch
Select a function with this switch.
Select switch (Applicable for Class I and Class II function)
⑾
When the function is set at the same time as the Select switch is
being pressed, the leakage test will be conducted the insulation test.
⑿ Fuse
Protected by a 600V/10A ceramic fuse (F type Φ6.3x32mm).
User can replace this fuse.
8
Product
summary and
explanation
⒀ Mains cord (UK) M-7209
This mains cord can be connected to the mains supply so that the
instrument can derive power from it. To measure contact current, the
socket of the mains power supply has to have an earth terminal.
Fig.4
⒁ Test Lead with safety crocodile clip(M-7208) and Probe with Blade type
Prod(M-7163). The probe and crocodile clip are interchangeable.
Please use it according to a measurement use.
Probe with Blade Type Prod
Crocodile Clip
Fig.5
⒂ Extension leads adaptor KAMP S (UK)
This is for connecting the instrument and an extension lead (cord
reel).
IEC Connector
Fig.6
9
3.5 Explanation for indications
LCD Display
Product
summary and
explanation
Insulation measurement voltage
Power supply voltage
(Live-Neutral) indication
Over range display: > is displayed on the LCD.
Leakage current indication
Load current indication
Null indication
Unit indication
Fig.7
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