VR2250
Page 2 of 131
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.
LOW
Ω
: 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.
M
Ω
: 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
6.4.
LOOP
: Measurement of Line Impedance, Fault loop Impedance, Prospective Short Circuit Current
Calculation and Phase Sequence Indicator .............................................................................................................. 38
6.4.1.
High resolution Impedance measurement (0.1m
Ω
) ........................................................................................................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
6.4.5.
Measurement procedure and results of " R
A
" mode ...................................................................................................43
6.4.6.
Measurement procedure and results of "
" mode .......................................................................................................44
6.4.7.
LOOP
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
