Instruction Manual
Contents
1. new style dual purpose case housing and carrying case Uses only 6 X 1 5V battery type AA or equivalent Incorporates front panel Ohms zero adjust Fuse protected continuity ranges only Taut band construction Expanded insulation and continuity scales for ease of reading Battery check facility LIVE circuit audible and visual indication 3 insulation test voltages 2 continuity ranges Back light function 200mA test current on continuity ranges ImA nominal insulation current 2 2 Principles of Measurement An Insulation Continuity Tester performs two basic functions As a continuity tester the instrument can be used to measure 2 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 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 o test at socket Na tempora ia a between L and E fy E Typical arrangement for measuring the continuity of protective conductors Before proceeding with tests conductors must be proved to be de energised As an insulation tester the instrument is used to measure high values of res2. BATT check and press the test button If the pointer does not move to BATT good the battery needs to be replaced 5 2 Test Leads Check Connect the leads to the Tester switch to the Q x function and press and turn the test button to lock it down When the leads are connected together the pointer should move from the oo position towards the 0 position on the green ohms scale If not the leads or fuse may be faulty or you need to adjust the ohms zero knob to zero the pointer Release test button after completion 6 Insulation Tests a Select the desired insulation test voltage 250V 500V or I 000V b Connect the test leads to the Tester and circuit under test c If the live circuit warning lamp is NOT LIT and the warning buzzer does not sound press the test button Read the red megaohm scale directly for the 500V range multiply by 0 5 for 250V and by 2 for 1000V Note Never turn the test voltage range switch during insulation testing while the test button is depressed this may damage the instrument Never touch the circuit under test during an insulation test 7 Continuity Testing Resistance Tests a Select the desired ohms range 202 Qx1 or 20 9x10 b Shortthe test leads press the test button and adjust the ohms zero adjust to zero the pointer on the green ohms scale c Connectthe test leads to the circuit under test If the live circuit warning lamp is NOT LIT and the buzzer does not sound press the test butto
3. KEWTECH KT3 digital multi function tester i KEWTECH alzi Instruction manual Contents I Safety Notice 2 Features and Principles of Measurement 2 3 Layout Diagram 5 4 Specifications 6 5 Testing 8 6 Insulation Tests 9 7 Continuity Testing Resistance Tests 9 8 Servicing amp Calibration ll Congratulations on purchasing this Kewtech model KT31 Analogue Insulation Continuity Tester This unit has been designed to comply with the current IEE Regulations and International Regulations By using the latest technology this Tester will give accurate and reliable results when used in accordance with these operating instructions I 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 I 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 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 tes
4. ble 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 6 6V shall be 250V Range 0 25MQ approx 2400 times or more 500V Range 0 5MQ approx 1200 times or more I000V Range IMQ approx 600 times or more Qx Range Q approx 800 times or more Applied Standards Operation EN 61557 1 2 4 Safety EN61010 Cat lll 300V Protection IEC60529 IP40 Accessories SL20 ACC020 Test Leads Test Lead Pouch 5 Testing General Preparation for measurements without pressing the test but ton check that the pointer lines up with the oo mark on the red megaohm scale If not adjust it by rotating the movement zero adjust with a small screwdriver Initial Checks These must be conducted prior to any testing Important Before pressing the test button if at any time the live circuit neon is lit or the warning buzzer sounds STOP the circuit is live and must be de energised 5 1 Battery Check a When the battery voltage falls below 6 5V the Tester will not give reliable results the battery check function ensures that accurate results are maintained b Before conducting the battery check always ensure that the instrument is not connected to any circuit Remove the instrument leads c Switch the function selector switch to
5. istance and hence the electrical quality of the insu lating material within the circuit The insulation tester applies a voltage measures the total leakage current flow and displays the calculated resistance A DC voltage is used to eliminate leakage currents caused by capacitance in the circuit A steady insulation resistance reading will indicate that any capacitance within the system is fully charged and the capacitive leakage current has reduced to zero 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 Equipment disconnected breakers closed Mains switch open O Switches Lamps out closed Reading not less E than 0 5 MQ sm Main switch sd O kJ open Lect Note Insulation testing must only be undertaken on de energised circuits Layout Diagram Crocodile Clip Prod Ohms Zero Adjust Test Button Meter Movement Zero Adjust Live Circuit Warning Lamp Light Switch Power on Indication Lamp l 2 3 4 5 6 7 8 9 Range Switch 4 Specifications Insulation Resistance Measurement Specification Test Voltage 250V 500V 1000V Measuring Ranges 0 100M O 0 200M Q 0 400MO Mid scale Value MQ 2 MQ 4MQ Nominal Output 250V DC min 500V DC min 1000V DC min Vo
6. ltage UN at 0 25MQ at 0 5MQ at IMQ Nominal Output ImA DC min ImA DC min ImA DC min Current In at 0 25MQ at 0 5MQ at IMQ 5 of indicated 5 of indicated 5 of indicated Intrinsic Accuracy value at value at value at 0 IMQ to I0M9 0 2M9 to 20MQ 0 4MQ to 40MO 0 7 of scale length at ranges other than above ranges Continuity Resistance Measurement Specification Measuring Ranges 0 29 0 2002 Open circuit voltage Ug 4 9V Nominal output current In 200 mA Intrinsic accuracy 3 of scale length Reference Conditions Ambient Temperature 23 5 C Relative Humidity 60 15 Supply Voltage 9V Position Front panel plane horizontal Altitude Less than 2000m Insulation Resistance Operating Error Range Operating Range Compliant with EN 61557 2 Operating Error 250V 0 IMO to TOMO 500V 0 2MQ to 20MQ I 000V 0 4MQ to 40MQ Continuity Resistance Operating Error Range Operating Range Compliant with EN 61557 4 Operating Error Q x 0 20 to 2Q Qx 10 29 to 2002 The influencing variations used for calculating the Operating Error are Operating Temperature 0 C to 40 C Relative Humidity 85 maximum Position Reference plane 90 Supply Voltage 6 6V to 9V General Specification Storage Temperature 20 C to 60 C Storage Relative Humidity 85 maximum Power Supply 6 X 5V batteries type R6 or eguivalent Fuse user replaceable 500mA 600V fast acting ceramic Weight minus batteries 540g Possi
7. n Read the 9 x range directly multiply by 10 for Q x 10 d Back light function is provided to facilitate work at night or dimly lit locations e Hold down the light switch to obtain illumination General Lock down feature for hands free operation press and turn the test button Warning The circuit must not be live conduct initial checks first before using this feature Otherwise damage will result a Using the Tester in this mode may leave the circuits under test charged up when conducting insulation tests due to capacitance To avoid this always release the test button by rotating anti clockwise while the leads are still connected to the circuit This will ensure that any electrical charge is dumped through the Tester s internal resistor circuits b If pressing the test button has no effect check the fuse in the instrument See fuse replacement c Fuse and Battery replacement Fuse type 0 5A 600V fast acting ceramic to IECI 27 only use the correct fuse for replacement Battery type 6 x 1 5V battery type R 6 AA or equivalent To replace the batteries or fuse first disconnect all test leads from the instrument Open the back cover on the tester by unscrewing the metal captive screw to reveal the battery compartment The fuse lifts out of its recess The 6 1 5V R 6 type batteries are located in a separate detachable battery holder inside the compartment Always replace all six batteries with new ones at the same
8. or the attention of the cal ibration department and be sure to include all accessory leads as they are part of the calibration procedure Kewtech reserve the right to improve specifications and designs without notice and without obligations Case strap shoulder pad and test lead pouch assembly Assemble the shoulder strap through the case lugs and the test lead pouch in the following sequence I Pass the strap down through the first lug under the case and up through the other lug __ and 2 Slide the shoulder pad onto the strap 3 Feed the strap down through 4 Pass the strap through the buckle the slots in the back of the test adjust the strap for length and lead pouch secure Distributor Kewtech Corporation Limited 76 St Catherine s Grove Lincoln LN5 8NA www kewtechcorp com KEWTECH 92 1613 04 03
9. t 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 I Ht is essential to understand and follow the safety rules 2 1 P gt r gt pp p gt A contained in this manual They must always be observed when using the instrument Features and Principles of Measurement Features Robust
10. time never mix old and new types Back Light Function To facilitate working in dimly lit situations a back light function is provided which illuminates the display To operate this func tion the back light button must be depressed and released whilst pressing the test button When the test button is released the back light will switch off If the test button is depressed again within a few seconds the back light will auto 10 matically switch on without having to press the back light but ton It is advisable that the back light function is only used when absolutely necessary as constant use may degrade the battery life faster than normal 8 Servicing amp 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 of fault Make sure that a Operating instructions have been followed b Leads have been inspected c Fuse has been checked d Batteries have been checked e The unit is returned with all accessory leads Regular re calibration is recommended for this instrument We recommend that with normal use this unit is calibrated at least once in every 2 month period When the unit is due for re cal ibration return to Kewtech marked f
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