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INSTRUCTION MANUAL

690V VOLTAGE TESTER

MT474

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Summary of Contents for MT474

Page 1: ...INSTRUCTION MANUAL 690V VOLTAGE TESTER MT474 ...

Page 2: ...2 ...

Page 3: ...ation of Symbols 7 5 Operation 8 5 1 Function Test Self Test 8 5 2 Voltage Test 8 5 3 Low Impedance Test 8 5 4 Single pole Phase Test 8 5 5 Voltage Test with RCD Trip Test 9 5 6 Continuity Test Diode Test 9 5 7 Rotary Field Indication 10 5 8 Measurement Point Illumination 10 5 9 Maintenance 11 5 10 Cleaning 11 5 11 Calibration Interval 11 5 12 Battery Replacement 11 ...

Page 4: ...ent are in perfect condition When using this instrument only the handles of the probes may be touched do not touch the probe tips This instrument may only be used within the ranges specified and within low voltage systems up to 690V Prior to usage ensure perfect instrument function e g on known voltage source The voltage testers may no longer be used if one or several functions fail or if no funct...

Page 5: ...se purposes for which it was designed For this reason in particular the safety references the technical data including environmental conditions and the usage in dry environments must be followed When modifying or changing the instrument the operational safety is no longer ensured The instrument may only be opened by an authorized service technician e g for repair 5 ...

Page 6: ...Single pole Phase Test Voltage range 100 690V AC ACV Frequency range 50 60Hz Continuity Test Resistance range 400kΩ Test current 5μA Overvoltage protection 400V AC DC 690VDC Rotary Field Indication Voltage range LEDs 100 690V Frequency range 50 60Hz Measurement principle double pole and contact electrode Low impedance test Voltage range 6 690V AC DC Low impedance 200kΩ Operation time 5s 230V AC DC...

Page 7: ... switch L2 10 Measurement point lighting Button 11 Battery case 12 Low impedance switch L1 4 EXPLANATION OF SYMBOLS DC voltage AC voltage DC voltage negative potential DC Phase display from 100 to 690V 50 60Hz when used as a single pole phase tester Continuity test symbol Rotating field display clockwise Rotating field display anticlockwise Device for work to be performed with voltage present Batt...

Page 8: ...nd an additional signal sound is audible Ÿ For negative voltages the and LEDs are illuminated and an additional signal sound is audible Ÿ The instruments are equipped with an LED row comprising 12 24 36 50 120 230 400 690V AC DC for DC voltage the polarity of the voltage displayed refers to the instrument test probe Ÿ Due to technical reasons the instrument cannot effectuate an automatic switch on...

Page 9: ... signal sound indicates the phase Ÿ The LED 5 is illuminated in the display 5 5 Voltage Test with RCD Trip Test During voltage tests in systems equipped with RCD circuit breakers a RCD switch can be tripped at a nominal residual current of 10mA or 30mA by measuring the voltage between L and PE To avoid RCD tripping a test has to be carried out between L and N during approx 5s Immediately afterward...

Page 10: ...supposed phase L1 The voltage and the rotary field direction are displayed R signifies that the supposed phase L1 is the actual phase L1 and the supposed phase L2 is the actual phase L2 L signifies that the supposed phase L1 is the actual phase L2 and the supposed phase L2 is the actual phase L1 When re testing with exchanged test probes the opposite symbol has to be illuminated 5 8 Measurement Po...

Page 11: ...aning After cleaning do not use the voltage tester for a period of approx 5 hours 5 11 Calibration Interval The voltage testers must be calibrated periodically and checked by our service department at regular intervals to ensure the specified accuracy of measurement results We recommend a calibration interval of one year 5 12 Battery Replacement If no signal sound is audible when short circuiting ...

Page 12: ...www major tech com www majortech com au sales major tech com info majortech com au MAJOR TECH PTY LTD South Africa Australia ...

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