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VT25 / VT28

VOLTAGE TESTER

Instruction

Manual

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Summary of Contents for VT25

Page 1: ...VT25 VT28 VOLTAGE TESTER Instruction Manual ...

Page 2: ...essories 5 2 4 Battery Installation 5 3 Operation 6 3 1 Description of VT25 VT28 6 Elements and LED Indicators 3 2 Auto power On Off 8 3 3 Torch 8 3 4 Low Battery Check 8 3 5 Removable Probe Tip Covers 8 3 6 Operating Duty Ratio 9 3 7 Proving Check 9 3 8 Testing for the Presence of 10 Hazardous Live Voltage 3 9 Interference Phantom Voltage 11 3 10 Single Pole Phase Test 11 3 11 Phase Rotation Test...

Page 3: ...anger refer to instructions Caution risk of electric shock Equipment protected by double or reinforced insulation Class II Suitable for live working CAT II Measurement Category II is applicable to test and measuring equipment connected directly to utilization points socket outlets and similar points of the low voltage MAINS installation CAT III Measurement Category III is applicable to test and me...

Page 4: ...w damage to the cable to be easily identified If there is any doubt the voltage tester should not be used Make sure the voltage tester is dry clean and free from dust grease and moisture while in use to avoid the danger from electric shock due to surface leakage Before and after each use the voltage tester must be proven using a suitable proving device or a known good voltage source Do not use the...

Page 5: ...tage tester cannot be guaranteed under such circumstances and it must not be used Cautions Avoid severe mechanical shock or vibration and extreme temperature If the voltage tester has been stored or transported in temperatures outside its normal operating range it should be given sufficient time to stabilise in the environment where it is to be used An acclimatisation time of at least 2 hours is r...

Page 6: ... When the indication voltage present appears on a part that is expected to be disconnected from the installation it is highly recommended confirming by another means e g use of an adequate voltage tester visual check of the disconnecting point of the electric circuit etc that there is no operating voltage on the part to be tested and to conclude that the voltage indicated by the voltage tester is ...

Page 7: ...of AC and DC voltage VT28 only u Continuity test with optical and acoustical indication up to 500kΩ u Single pole phase test u Phase rotation test u Auto power On Off u Automatic AC DC detection u Bright LED indication u Indication of voltage above the ELV level when batteries flat u Ergonomic and robust housing u Probe tip protection u Torch u Complies with BS EN 61243 3 2014 u Complies with GS38...

Page 8: ... L1 2 Test probe L2 3 Torch 4 Digital Voltmeter LCD VT28 only 5 Torch button 6 Main body 7 Battery compartment 8 Buzzer 9 ELV warning and single pole test indicator 10 Continuity indicator 11 Phase rotation indicators 12 Voltage threshold indicators 13 12V and polarity indicators 6 ...

Page 9: ... is at a value approaching or greater than the corresponding marked voltage For example if the voltage source is 55V AC rms then the 24V and 50V LED s will illuminate if 690V AC rms all voltage threshold LED s from 24V to 690V will illuminate ELV warning and single pole test indicator If the batteries are low or exhausted a hazardous live voltage will not be indicated by the polarity or voltage th...

Page 10: ...se short the test probes of the voltage tester together On the VT25 check for an audible tone and a bright RX LED 10 indication If there is no audible tone or the RX LED is faint the batteries need to be replaced see section 4 1 Battery Replacement On the VT28 if the batteries need replacing will be displayed in the top left corner of the LCD Do not use the unit if the batteries need replacing 3 5...

Page 11: ...ter is functioning correctly with a proving device PD690 PD700 or PD710 is recommended or a known good voltage source Do not use the voltage tester if any expected voltage indication LED s fail to illuminate correctly during proving The LED s that illuminate during proving will depend on the magnitude of the proving unit output or the voltage source See table 1 Also check the buzzer sounds during ...

Page 12: ...f Hazardous Live Voltage Warning Hold the voltage tester and test prod behind the finger guards in a manner that will not obscure the voltage indication LED s Never touch the exposed metal test prods or any part of the voltage tester forward of the finger guards while applied to hazardous voltages If testing at locations with high background noise levels always determine whether the buzzer is perc...

Page 13: ...ation under test The phase indicator LED 9 will illuminate and the buzzer will sound if the presence of AC voltage 100V is detected 3 11 Phase Rotation Test While taking all required safety precautions connect the test probes L1 and L2 to the phases to be tested The phase to phase voltage will be indicated by the voltage threshold LED s 12 or for the VT28 also by the LCD 4 The direction of the pha...

Page 14: ...der test Read the measured AC or DC voltage from the LCD 4 4 MAINTENANCE 4 1 Battery Replacement To avoid shock or injury disconnect the voltage tester from any external circuits before proceeding Use diagram to the right as reference for battery replacement To gain access to the battery compartment use a coin or flat blade screwdriver to turn the battery door anti clockwise until the dots align P...

Page 15: ...13 2 1 3 OPEN OP EN Fixed Body Battery Door ...

Page 16: ...ticular attention should be paid to all areas forward of the finger guards Do not use abrasives abrasive solvents or detergents which can cause damage to the voltage tester Allow the voltage tester to thoroughly dry before use 4 4 Repair and Service There are no user serviceable parts in this unit Return to Martindale Electric if faulty Our service department will quote promptly to repair any faul...

Page 17: ...ice free of charge repair or replacement of a defective product which is returned to Martindale within the warranty period This warranty is the buyer s sole and exclusive remedy and is in lieu of all other warranties expressed or implied including but not limited to any implied warranty of merchantability or fitness for a particular purpose Martindale shall not be liable for any special indirect i...

Page 18: ...In 3 5mA Duty ratio 30s ON operated 240s OFF recovery Overvoltage protection 690V DC or AC rms Digital Voltmeter VT28 only Voltage range 10V to 690V DC 16 to 400Hz Resolution 0 1V Accuracy 3 5 digits Single Pole Phase Test Voltage range 100 to 690V AC rms Frequency range 50 to 60Hz Phase Rotation Test Voltage range 120 to 400V AC rms phase to earth Frequency range 50 to 60Hz Continuity Resistance ...

Page 19: ...x Dimensions packed 285 x 72 x 41 mm Weight packed approx 250g Includes 2 x 1 5V AAA batteries 2 x probe tip covers instructions SAFETY Conforms to BS EN 61243 3 BS EN 61010 1 CAT IV 600V CAT III 1000V Class II double insulation IP rating IP64 to BS EN 60529 GS38 compliance with probe covers fitted EMC Conforms to BS EN 61326 1 17 ...

Page 20: ...pment Multifunction Testers Non trip Loop Testers Pat Testers Accessories Phase Rotation Testers Proving Units Socket Testers Thermometers Probes Test Leads Voltage Indicators Specialist Metrohm Testers 4 5kV Specialist Drummond Testers Martindale Electric Co Ltd Metrohm House 12 Imperial Park Imperial Way Watford WD24 4PP UK T 01923 441717 F 01923 446900 www martindale electric co uk sales martin...

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