Chapter II
Digital Earth Tester
25
USER MANUAL
CONTENTS
1. GENERAL INSTRUCTIONS .......................................................................................................... 26
1.1. Precautions and safety measures ........................................................................................... 26
1.1.1. Before using the tester ...................................................................................................... 26
1.1.2. Using the tester ................................................................................................................. 26
1.1.3. Symbols ............................................................................................................................ 27
1.1.4. Instructions ....................................................................................................................... 27
1.2. Warranty .................................................................................................................................. 28
1.3. Repair and metrological verification ........................................................................................ 28
1.4. Cleaning .................................................................................................................................. 28
2. DESCRIPTION OF THE INSTRUMENT ......................................................................................... 29
2.1. General description ................................................................................................................. 29
2.1.1. Powering up, powering down and auto-shutoff ................................................................. 29
2.1.2. Selector switch.................................................................................................................. 29
2.1.3. "TEST" pushbutton ........................................................................................................... 29
2.1.4. Voltage presence lamp ..................................................................................................... 29
2.1.5. RCD range lights .............................................................................................................. 30
2.1.6. Buzzer .............................................................................................................................. 30
2.1.7. Digital display.................................................................................................................... 30
2.1.8. Input terminals .................................................................................................................. 30
2.1.9. Stand ................................................................................................................................ 30
2.1.10. Mains connector unit and assembly .................................................................................... 30
2.1.11. 12 V mains power supply .................................................................................................... 30
2.2. Power supply ........................................................................................................................... 31
2.2.1. Supply via an accumulator pack (reminder: CA model ref. HX0086) .................................... 31
2.2.2. V battery supply ................................................................................................................... 34
2.3. Storage .................................................................................................................................... 36
3. FUNCTION DESCRIPTION ............................................................................................................ 37
3.1. &RQWLQXLW\PHDVXUHPHQWV³x´ ............................................................................................... 37
3.2. R Earth measurements ............................................................................................................ 38
3.3. Measuring the "R loop" resistance........................................................................................... 39
3.4. Ri Insulation Measurements .................................................................................................... 40
3.6. Measuring AC voltage ............................................................................................................. 41
3.7. RCD test .................................................................................................................................. 41
3.7.1. Method .................................................................................................................................. 41
3.7.2. Meaning of one of the range lights flashing .......................................................................... 42
4. Technical specifications .................................................................................................................. 43
4.1. Functional specifications ......................................................................................................... 43
4.1.1. Continuity (IEC 61557-4, 1997) ........................................................................................ 43
4.1.2. Earth (IEC 61557-5, 1997) ................................................................................................ 43
4.1.3. R LOOP ............................................................................................................................ 43
4.1.4. Isolation (IEC 61557-2, 1997) ........................................................................................... 44
4.1.5. Current (with MN73 clamp) ............................................................................................... 44
4.1.6. Voltage ....................................................................................................................... 44
4.1.7. RCD test ........................................................................................................................... 44
4.1.8. Reference conditions ........................................................................................................ 45
4.1.9. Climatic conditions ............................................................................................................ 46
4.1.10. Variation in nominal field of use ........................................................................................ 46
5. SPECIFICATIONS .......................................................................................................................... 49
5.1. General specifications ............................................................................................................. 49
5.2. To order ................................................................................................................................... 49
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