Kewtech KT35 Manual de usuario
KEWTECH
KT35 digital multi function tester
Instruction manual
Contents
1 Safety Notice 1
2Features and Principles of Measurement 2
3Instrument Layout 5
4 Specifications 6
5Functions 8
6The nature of insulation resistance 9
7Preparation for measurement 12
8Insulation resistance testing 12
9Continuity Testing 13
10 General 14
11 Battery and fuse replacement 14
12 Servicing & Calibration 15
1 Safety Notice
Electricity can cause severe injuries even with low voltages
or currents. Therefore it is extremely important that you
read the following information before using this Insulation
Tester.
1.1 This instrument must only be used by a competent trained
person and in strict accordance with the instructions.
Kewtech will not accept liability for any damage or injury
caused by misuse or non-compliance with instructions or
safety procedures.
1.2 This instrument must not be used on live circuits. Ensure
all circuits are de-energised before testing.
1
1.3 Never open the instrument case except for battery or
fuse replacement.
1.4 Always inspect your Insulation Tester and test leads before
use for any sign of abnormality or damage. If any abnormal
conditions exist (broken test leads, cracked case, display
faulty, inconsistent readings, etc) do not attempt to take
any measurements. Return to Kewtech for rectification.
1.5 Never replace the protective fuse inside the instrument
with any other than the specified or approved equal
(0.5A/600V) fast acting ceramic to IEC127.
1.6 This meter has been designed with your safety in mind.
However, no design can completely protect against incor-
rect use. Electrical circuits can be dangerous and/or lethal
when a lack of caution or poor safety practice is used. Use
caution in the presence of voltages above 50V as these
pose a shock hazard.
1.7 Pay attention to cautions and warnings which will inform
you of potentially dangerous procedures.
1.8 If at anytime during testing there is a momentary degrada-
tion of reading, this may be due to excessive transients or
discharges on the system or local area. Should this be
observed, the test should be repeated to obtain a correct
reading. If in doubt always contact Kewtech.
1.9 Never assume an installation circuit is not live. Confirm it is
de- energised before commencing testing.
1.10 Replace worn and/or damaged leads with new ones
approved by Kewtech immediately.
1.11It is essential to understand and follow the safety rules
contained in this manual. They must always be observed
when using the instrument.
1.12 Warning: This product is an insulation/continuity tester and
is designed for use on de-energised systems. It
2
incorporates voltage warning circuits in case of accidental
connection to an AC voltage. On no account should the
product be used to measure voltage. Voltages should be
measured with a dedicated voltage measuring instrument
and it is recommended that fused test leads are always
used for personal safety when measuring such voltages
especially on high energy circuits.
Note: This product is supplied with ACC020 unfused leads.
Thes can be converted to fully fused types by attaching the
optional ACC040 fused module.
1.13 Users of this equipment and or their employers are
reminded that Health and Safety Legislation require them
to carry out valid risk assessments of all electrical work so
as to identify potential sources of electrical danger and risk
of electrical injury such as from inadvertent short circuit.
Where the assessments show that the risk is significant
then the use of fused test leads constructed in accordance
with the HSE guidance note GS38 Electrical Test
Equipment for use by Electricians should be used.
1.14 Always keep your hands and fingers behind finger guards
on test leads used with this instrument. For safety reasons
always use the accessories approved by Kewtech. The use
of other accessories is prohibited as they may not have the
same safety features built in.
2Features and Principles of Measurement
2.1 Features
▲3 1/2 Digit Microprocessor Controlled Insulation Tester
▲Three Insulation test voltages 250V, 500V, 1000V
▲Three continuity ranges, 20Ω, 200Ωand 2000Ω
▲Three insulation resistance ranges 20MΩ, 200MΩ,
2000ΩM
3
temporary
link
test at socket
between L and E
Typical arrangement for measuring the continuity of protective
conductors. Before proceeding with tests conductors must be
proved to be de-energised.
▲200mA continuity short circuit test current
▲1mA test current at the minimum load on insulation ranges
▲Bar graph indicates test voltage-rise and decay can be
observed during insulation tests
▲Warning of external voltage presence
▲‘Press to test’ button with lock down feature. Releasing the
test button automatically discharges the capacitance of a
circuit under test
▲Auto null feature
2.2 Principles of Measurement
An Insulation/Continuity Tester performs two basic functions.
As a continuity tester the instrument can be used to measure
low values of resistance between two points in an electrical cir-
cuit. In this mode the instrument acts as a low voltage current
source. The resistance is calculated from the measurement of
the voltage and the current through the conductor. Careful
4
connection to the circuit under test is essential to avoid mea-
surement errors. Circuits connected in parallel to the circuit
under test may also effect the accuracy of the measurement.
Possible insulation resistance measurement errors may be
caused by the circuit under test being wet and/or dirty. Errors
may also occur when testing large installations where the insu-
lation resistances may effectively be in parallel.
All fuses in or circuit
breakers closed
Mains switch open
Equipment disconnected
Note: Insulation testing must only be undertaken on
de-energised circuits.
Switches
closed
Lamps out
Reading not less
than 0.5 MΩ
Main
switch
open
5
3Instrument layout
1Crocodile Clip
2Prod
3Range Switch
4Function Switch
5Test Button
6LCD Display
1
2
3
4
5
6
6
4 Specifications
Insulation Resistance Measurement Specification
Test Voltage 250V 500V 1000V
0 -20M Ω0 -20M Ω0 -20MΩ
Measuring Ranges 0 -200M Ω0 -200M Ω0 -200MΩ
0 -2000M Ω0 -2000M Ω0 -2000MΩ
Nominal Output 250V DC min. 500V DC min. 1000V DC min.
Voltage (UN) at 0.25MΩat 0.5MΩat 1MΩ
Nominal Output 1mA DC min. 1mA DC min. 1mA DC min.
Current (In) at 0.25MΩat 0.5MΩat 1MΩ
±(5% rdg + 5 dgt)
Intrinsic
Accuracy
Continuity Resistance Measurement Specification
Measuring Ranges 0 -20Ω0 -200Ω0 - 2000Ω
Open circuit voltage (Uq) 4 - 9V
on the 20Ωrange
Nominal output current (In) 200 mA
on the 20Ωrange
Intrinsic accuracy 0 -20Ω0 -200Ω+0 - 2000Ω
Reference Conditions
Ambient Temperature: 23 ± 5°C
Relative Humidity: 60 ± 15%
Supply Voltage: 9 V
Altitude: Less than 2000m
20MΩ
200Mz
2000MΩ0 to 1GΩ
1G to 2Gz
±(10% rdg + 3 dgt) ±(3% rdg + 3 dgt)
±(1.5% rdg+ 5dgt) ±(1.5% rdg+ 3dgt)
7
Insulation Resistance Operating Error
Range Operating Range Compliant with
EN 61557-2 Operating Error
20MΩ0.2MΩto 20MΩ
200MΩ2MΩto 200MΩ
2000MΩ20MΩto 1000MΩ
Continuity Resistance Operating Error
Range Operating Range Compliant with
EN 61557-4 Operating Error
20Ω0.2Ωto 20Ω
200Ω10Ωto 200Ω20Ω
2000Ω100Ωto 2000Ω
The influencing variations used for calculating the
Operating Error are:
Operating Temperature: 0°C to 40°C
Relative Humidity: 85% maximum
Supply Voltage: 7V to 9V
General Specification
Storage Temperature: -10°C to 50°C
Storage Relative Humidity: 85% maximum
Power Supply: 6 X 1.5V batteries type AA or
equivalent
Fuse (user replaceable): 500mA/600V fast acting ceramic
Weight (minus batteries): 538g
Possible number of operations during battery life:
When the following resistance is connected to a measuring
terminal alternating between 5 seconds loading and
intervals of 25 seconds, the number of measurements that
it is possible to make, until the battery voltage falls 7.0V
shall be:
8
250V Range 0.25MΩapprox.1200 times or more
500V Range 0.5MΩapprox.1200 times or more
1000V Range 1MΩapprox. 400 times or more
20ΩRange 1Ωapprox. 300 times or more
Applied Standards
Operation: EN 61557-1/2/4
Safety: EN61010 Cat.III 300V
Protection: IEC60529 (IP40)
Accessories
ACC020
Test Leads Pouch
5Functions
5.1 Bar Graph
While conducting insulation resistance tests, the LCD will dis-
play the value of insulation resistance. The bar graph will dis-
play the DC test voltage present across the ends of the
test leads. This means that the user can verify that the circuit
is being stressed by the full DC test voltage (250V, 500V or
1000V).
For circuits that have a large capacitance the bar graph will rise
more slowly than for those with low capacitance. When used in
the Trac mode the bar graph will display the real time fluctua-
tions in insulation test voltage and show breakdown. This can
be used to indicate good and bad circuits as a rapidly fluctuating
bar graph indicates unstable conditions.
5.2 Auto Null
When conducting continuity tests it is important to remember
that the measured resistance includes the resistance of the test
leads. An electronic leads null function is provided which auto-
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