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Kewtech KT35 Скачать руководство пользователя страница 5

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

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Содержание KT35

Страница 1: ...KEWTECH KT35 digital multi function tester Instruction manual ...

Страница 2: ...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...

Страница 3: ...afety 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 shou...

Страница 4: ...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...

Страница 5: ...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 electric...

Страница 6: ...urement 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 ...

Страница 7: ...5 3 Instrument layout 1 Crocodile Clip 2 Prod 3 Range Switch 4 Function Switch 5 Test Button 6 LCD Display 1 2 3 4 5 6 ...

Страница 8: ...DC min 1mA DC min Current In at 0 25MΩ at 0 5MΩ at 1MΩ 5 rdg 5 dgt Intrinsic Accuracy Continuity Resistance Measurement Specification Measuring Ranges 0 20Ω 0 200Ω 0 2000Ω Open circuit voltage Uq 4 9V on the 20Ω range Nominal output current In 200 mA on the 20Ω range Intrinsic accuracy 0 20Ω 0 200Ω 0 2000Ω Reference Conditions Ambient Temperature 23 5 C Relative Humidity 60 15 Supply Voltage 9 V A...

Страница 9: ...perating 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 conn...

Страница 10: ...s 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...

Страница 11: ...lways be a current between conductors and to earth And this is known as leakage current This current is made up of three components 6 1 Capacitive Current The insulation between conductors at different voltages behaves as the dielectric of a capacitor the conductors behav ing as the capacitor plates When a direct voltage is applied to the conductors charging current will flow to the system but wil...

Страница 12: ...nce MΩ 6 3 Surface Leakage Current Where the insulation is removed for connection of conductors and so on current will flow across the surfaces between the bare conductors If the surfaces are clean and dry the amount of leakage current is very small indeed but it may become sig nificant in wet and dirty conditions 10 Insulation acting as resistance Resistance effect Conductors Insulation Conductor...

Страница 13: ...k age current flow displaying the resistance which is obtained by an internal calculation based on Ohm s Law Test Voltage V Insulation Resistance MΩ Leakage Current µA As the effective capacitance of the system charges up so the leakage current reduces A steady insulation resistance reading indicates that the system capacitance is fully charged and that the capacitive component of current has fall...

Страница 14: ...e OR indication will mean that the leads are faulty or instrument fuse is blown see fuse replacement section 12 8 Insulation Resistance Testing Warning Insulation tests should be conducted on circuits that are de energised Ensure circuits are not live before commencing testing 8 1 Select the required test voltage 250V 500V or 1000V by rotating the function dial 8 2 Select the required range 20M 20...

Страница 15: ...ed This is because the system may be charged up and it must be allowed to dis charge through the tester s internal discharge resistor The KT35 will show this discharge as a decaying bar graph 9 Continuity Testing Resistance Tests Warning Ensure circuits are not live before commencing testing 9 1 Select the continuity test by rotating the function dial 9 2 Select the 20Ω range by rotating the range...

Страница 16: ...te the value of external AC voltage see section 8 3 Note On the 20Ω range the end of test bleep has a lower tone for resistances less than approx 5Ω 10 General If at any time the display shows OR this means that the value being measured is greater than the range selected Switch to a higher range in this case The test button can be locked down for ease of use Do not forget to release the test butto...

Страница 17: ...compartment lid back on before using the tester 12 Servicing Calibration If this product requires cleaning use a damp cloth to wipe it Do not use strong cleaning agents as these may damage the plastic surfaces Ensure that it is perfectly dry before switching on If this tester should fail to operate correctly return to Kewtech marked for the attention of the Service Department stating exact nature ...

Страница 18: ...16 as they are part of the calibration procedure Kewtech reserve the right to improve specifications and designs without notice and without obligations ...

Страница 19: ...st lead pouch in the following sequence 1 Pass the strap down through the first lug under the case and up through the other lug 2 Slide the shoulder pad onto the strap 3 Feed the strap down through the slots in the back of the test lead pouch 4 Pass the strap through the buckle adjust the strap for length and secure ...

Страница 20: ...KEWTECH Kewtech Corporation Limited 76 St Catherine s Grove Lincoln LN5 8NA www kewtechcorp com Distributor 92 1614 04 03 ...

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