Table of Contents
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TABLE OF CONTENTS
1. SAFETY PRECAUTIONS AND PROCEDURES .......................................................................................... 5
1.1. Forwards ...................................................................................................................................................................... 5
1.2. Preliminary Instruction ................................................................................................................................................. 5
1.3. During Use ................................................................................................................................................................... 6
1.4. After Use ...................................................................................................................................................................... 6
2. GENERAL DESCRIPTION ........................................................................................................................... 7
2.1. Introduction .................................................................................................................................................................. 7
2.2. Functions ..................................................................................................................................................................... 7
3. PREPARATION FOR USE ........................................................................................................................... 8
3.1. Initial Control ................................................................................................................................................................ 8
3.2. Power Supply .............................................................................................................................................................. 8
3.3. Calibration ................................................................................................................................................................... 9
3.4. Storage ........................................................................................................................................................................ 9
4. INSTRUMENT DESCRIPTION ....................................................................................................................10
4.1. Display Description .................................................................................................................................................... 11
4.2. Initial Screen .............................................................................................................................................................. 11
4.3. Backlight function ...................................................................................................................................................... 11
5. INITIAL SETTINGS ......................................................................................................................................12
5.1. How to Adjust the Contrast ....................................................................................................................................... 12
5.2. How to Set Date and Time ........................................................................................................................................ 12
5.3. How to Set the Language .......................................................................................................................................... 12
5.4. RESET ....................................................................................................................................................................... 13
6. SAFETY TEST FUNCTIONS .......................................................................................................................14
6.1. LOWΩ: Continuity Test with 200mA Test Current ................................................................................................... 14
6.1.1. Calibrating the test leads ("CAL" Mode) ..........................................................................................................................15
6.1.2. Measurement Procedure .................................................................................................................................................17
6.1.3. Results of "AUTO" mode .................................................................................................................................................17
6.1.4. Results of "RT+" and "RT-" modes ..................................................................................................................................18
6.1.5. "AUTO", RT+", "RT-" faulty cases ....................................................................................................................................18
6.2. MΩ: Insulation resistance Measurement with 50V, 100V, 250V, 500V, 1000V Test Voltage ....................................... 20
6.2.1. Measurement Procedure .................................................................................................................................................20
6.2.2. Results of "MAN" mode ...................................................................................................................................................22
6.2.3. Results of "TMR" mode ....................................................................................................................................................23
6.2.4. "MAN" and "TIMER" mode faulty cases ...........................................................................................................................24
6.3. RCD: Test on "A" and "AC" RCDs Type ................................................................................................................... 25
6.3.1. Tripping times for the general and selective RCDs ..........................................................................................................27
6.3.2. Measurement procedure ..................................................................................................................................................28
6.3.3. RCD Faulty cases ............................................................................................................................................................33
: Measurement of Line Impedance, Fault loop Impedance, Prospective Short Circuit Current
Calculation and Phase Sequence Indicator .............................................................................................................. 38
6.4.1. High resolution Impedance measurement (0.1mΩ) ........................................................................................................38
6.4.2. Measurement procedure and results of "P-N" mode .......................................................................................................39
6.4.3. Measurement procedure and results of "P-P" mode ........................................................................................................40
6.4.4. Measurement procedure and results of "P-PE" mode .....................................................................................................41
Faulty Cases ..................................................................................................................................................45
6.5. EARTH: Soil Resistance and Resistivity Measurements ......................................................................................... 50
6.5.1. Measurement procedure and results of "2-W"and "3-W" mode .......................................................................................51
6.5.2. Measurement procedure and results of "ρ" mode ...........................................................................................................52
6.5.3. "2-W", "3-W" and "ρ" faulty cases ....................................................................................................................................53
" mode ...................................................................................................43
" mode .......................................................................................................44
Page 2 of 131
VR2250
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