KT300
Insulation / Continuity Tester
Operating Instructions
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1. Safety
1.1 Equipment Markings
>
550V
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CAT
IV
300V
CAT
III
500V
Caution - refer to the instruction manual.
Construction is double insulated.
Product should be recycled as electronic waste.
Conforms to EU standards.
Prohibited to use on Electrical Systems which use voltages
above 550V.
Measurement Category IV is applicable to testing and
measuring circuits at the origin of the installations supply.
They are utility level CAT checks. This part of the installation
is expected to have a minimum of one level of over-current
protective device between the transformer and connecting
points of the measuring circuit.
This tester’s voltage rating for CAT IV locations is 300V,
where the voltage is Phase (line) to Earth.
Measurement Category III is applicable to testing and
measuring circuits connected after the source of the
building’s low-voltage MAINS installation. This part of the
installation is expected to have a minimum of two levels of
over-current protective devices between the transformer and
connecting points of the measuring circuit.
Examples of CAT III are measurements on devices installed
after the main fuse or circuit breaker xed within the building
installation. Such as distribution boards, switches and
socket outlets.
This tester’s voltage rating for CAT III location is 500V where
the voltage is Phase (line) to Earth.
1.2 Operational Safety
The KT300 is designed to be used by skilled persons in accordance
with safe methods of work. If the KT300 is used in a manner not
specied by Kewtech, the protection provided by it may be impaired.
Inspect the product before using. If any damage is visible; such as
cracks in the casing, damage to any accessories, leads or probes,
the unit should not be used.
Do not operate the KT300 with the battery cover off as this will
compromise the insulated safety barrier.
To maintain safety, ensure serviceability and to monitor accuracy of
the KT300 the tester should be checked on a checkbox such as the
Kewtech FC2000 checkbox at regular intervals.
Although fully protected against accidental connection to live circuits
the KT300 should only be used on dead circuits. If accidentally
connected to a live circuit the Volts Present LED will ash and an
audible alarm will sound. Testing will be inhibited.
During insulation testing do not touch the jaws of any clips or the
prod tips as they will become energised.
Contents
KT300 Continuity Insulation Tester
ACC020 2 wire test lead set
Batteries
Carry case
Manual
Optional
Kewcheck R2 - socket test lead adapter
Lightmates – test lead adapters for lighting points
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2. DESCRIPTION
The KT300 is compact high specication digital insulation /
continuity tester.
2.1 Features
• Insulation test (50V, 100V, 250V, 500V, 1000V)
• Continuity test
• Buzzer
• Continuity Null
• Hands free function
• Breakdown Voltage
• Voltage Present LED
• Auto switch off function for battery preservation.
2.2 Indication
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The white display backlight will illuminate on switching on and during
testing. To preserve battery life the backlight will switch off after
approximately 4 seconds of inactivity. The unit will automatically
power off after approximately 3 minutes of inactivity. To switch the
tester back on after auto power off, press any button.
Battery status
3. USAGE
Volts Present
LED
Continuity Null
Breakdown
Voltage
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Rotary
selection dial
Hands Free
selection button
Blown fuse
Test voltage
applied
4mm colour
coded sockets
The LCD is shown indicating a blown fuse
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3.1 Battery Installation
Unit requires 4 x AA batteries.
Ensure that all test leads are removed before installing batteries.
Remove the rubber over mould and battery cover on the reverse
of the unit. Install the new batteries ensuring correct polarity as
indicated. After installing batteries and before use ensure the battery
cover and over-mould are correctly tted, switch on the unit and
check for correct operation.
Dispose of used batteries as per the local authorities guidelines.
3.2 Operation
Continuity Null
To ensure greater accuracy when performing continuity tests a lead
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null should be carried out. This will ensure that test lead resistance is
taken into account when testing. Turn the rotary dial to the continuity
position, short the positive and negative test leads together, then
press the continuity null button. The test lead resistance will be
shown on the screen and further continuity testing will take into
account the test lead resistance. The test leads will remain nulled
until the tester is powered off or a new continuity null is carried out.
The continuity null function will null test leads up to the value of 5Ω.
Continuity
Turn the rotary dial to the continuity position. Apply test leads to
the resistance to be measured and press the test button.To ensure
accurate results for the test leads have been nulled.
Buzzer
The buzzer function is used for quick and easy “belling out”. Turn
the rotary dial to the buzzer function and apply the test leads to
the resistance to be measured. If a resistance of less than 50Ω is
measured a single tone will sound and <50Ω will be displayed on
the screen. There is no need to press the test button. Once the test
leads have been removed from the resistance being measured the
tester will make a dual tone and the screen will display >50Ω.
Insulation
Turn the rotary dial to the required test voltage. Push the test button.
During the test the screen will indicate the test voltage being applied.
The result will then be shown. During insulation testing do not touch
the jaws of any clips or the prod tips as they will be energised.
Hands Free
Hands free operation is available for Continuity or Insulation functions.
Select the function required with the rotary dial. Press the hands free
button.
HANDSFREE will be displayed. Once the test button is pressed the
tester will continue to perform the selected test until the hands free is
deselected, the test button is pressed or the unit is powered off.
Breakdown Voltage Testing
Breakdown voltage mode uses an increasing test voltage to nd
possible breakdown within insulation or a particular component
being tested. Breakdown is not always bad - for example a surge
protector is designed to break down and absorb damaging transients,
protecting equipment.
Your tester has been designed to detect breakdown where the voltage
collapses (as in a gas discharge tube) or attens off (as in a metal
oxide varistor). It is not designed to detect partial breakdown (where
the V/I slope changes), but might do so in some circumstances.
To perform a breakdown test, select the nominal test voltage (50V to
1000V) using the rotary switch. Press Breakdown voltage; the Ramp
Symbol appears. Press Test to begin the test. The Test Voltage ramps
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from 0V to the selected test voltage (plus 5% margin), where it
dwells for 1 second to prove the test piece. The ramp rate is approx
100V/s. If breakdown is detected, the test voltage is discharged,
limiting energy.
During and after testing the peak voltage is shown on the upper
display. If no breakdown occurs, the “>” symbol is prexed to
indicate the breakdown voltage is higher than the displayed value.
At all times the lower display shows the voltage on the tester
terminals. If greater than 25V rms is present before testing, the LED
ashes red and testing is inhibited.
Applications:
• Transient Voltage Suppressors
• Spark Gaps
• Gas Discharge Tubes
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• Neons
• Diode reverse voltage
Safety Fuse
The KT300 has a user replaceable safety fuse.
If the broken fuse indication is displayed on the screen the fuse can
be located by removing the battery cover.
Ensure that all test leads are removed. Remove the rubber overmould and battery cover on the reverse of the unit. Using a at bade
screwdriver lift out the fuse carrier. Replace the fuse with a Type F
500mA, 600V Fast Blow ceramic fuse.
After replacing the fuse and before use ensure the battery cover
and over mould are correctly tted, switch on the unit and check for
correct operation.
4. MAINTENANCE AND SERVICE
If required, clean with a damp cloth and mild detergent. Do not use
abrasives or solvents.
With the exception of the batteries and fuse there are no user
serviceable parts.
Contact Kewtech for parts and technical assistance.
WARRANTY - 2 years manufacturer’s when registered on the website:
Kewtechcorp.com/product-registration
ExpressCal, Unit 2, Shaw Wood Business Park, Shaw Wood Way,
Doncaster DN2 5TB
T: 01302 761044
E: expresscal@kewtechcorp.com
SPECIFICATION
Continuity test range accuracy
Range Tolerance (@20ºc)
0.00 to 9.99 Ω + (3% + 2 digits)
10.0 to 99.9 Ω + (3% + 2 digits)
100 to 19.99 kΩ + (3% + 2 digits)
Open circuit Voltage >4V, <10V
Zero offset adjust (test lead null) 5 Ω
Typical test time (2 Ω) >2 seconds
Hazard Warning LED >25V
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Insulation test range accuracy
Test Voltage Ranges (Auto Range) Tolerance (@ 20°C)
50 V
100 V
250 V
500 V
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1000 V
0.01 to 9.99 MΩ ± (6% + 2 digits)
10.0 to 49.9 MΩ ± (6% + 2 digits)
0.01 to 999 MΩ ± (6% + 2 digits)
10.0 to 99.9 MΩ ± (6% + 2 digits)
0.01 to 9.99 MΩ ± (3% + 1 digits)
10.0 to 99.9 MΩ ± (3% + 1 digits)
100 to 199 MΩ ± (6% + 1 digits)
0.01 to 9.99 MΩ ± (3% + 1 digits)
10.0 to 99.9 MΩ ± (3% + 1 digits)
100 to 199 MΩ ± (3% + 1 digits)
200 to 499 MΩ ± (6% + 1 digits)
0.01 to 9.99 MΩ ± (3% + 1 digits)
10.0 to 99.9 MΩ ± (3% + 1 digits)
100 to 399 MΩ ± (3% + 1 digits)
400 to 999 MΩ ± (6% + 1 digits)
The following table details the operating ranges for the individual
functions compliant with the performance requirements of EN61557.
Measurement
Range
Continuity 0.00 Ω - 19.99 kΩ. 0.1 Ω - 9.99 kΩ.
Insulation 0.00 MΩ - 1999 MΩ 0.1 MΩ - 1990 MΩ. IN = 1mA
Operating Range
per EN61557
IN>200mA
Uq < 7 V
Power supply 4 x AA LR6 Batteries
Battery life 50 hours
Overvoltage category
CAT III 500V
CAT IV 300V
Operating temperature 0 - 40ºC
Storage temperature -10 to 60ºC
Operating humidity 80% @ 31ºC to 50% @ 40ºC
Other
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Safety compliance BSEN 61010-2-030:2010
Insulation output voltage
Voltage Load Output Current Tolerance
50 V 50 kΩ 1 mA -0% +20%
100 V 100 kΩ 1 mA -0% +20%
250 V 250 kΩ 1 mA -10% +20%
500 V 500 kΩ 1 mA -10% +20%
1000 V 1 MΩ 1 mA -10% +20%
Short circuit current (into 2k Ω) < 2 mA
Typical Test Time (10 MΩ) < 2 seconds
EMC compliance BSEN 61326-2-2:2013
BSEN 61557-1:2007
Performance standard
BSEN 61557-2:2007
BSEN 61557-4:2007
Probes GS38 compliant
Dimension (mm) 180mm x 85mm x 50mm
Weight (g) Approximately 450g
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For repair and calibration please return to us at :
Express Cal
Unit 2, Shaw Wood Business Park, Shaw Wood Way, Doncaster DN2 5TB
01302 761044 F: 01302 321993
expresscal@kewtechcorp.com
Kewtech Corporation Limited
Midas House, Unit 2b, Stones Courtyard, High Street, Chesham, Bucks HP5 1DE
01494 792212 F: 01494 791826
sales@kewtechcorp.com
kewtechcorp.com
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