METREL MI 3125 User Manual

MI 3125 InstaltestCOMBO Insulation resistance
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5.3 Insulation resistance
The Insulation resistance measurement is performed in order to ensure safety against
electric shock through insulation. It is covered by the EN 61557-2 standard. Typical
applications are:
 Insulation resistance between conductors of installation,
 Insulation resistance of non-conductive rooms (walls and floors),
 Insulation resistance of ground cables,
 Resistance of semi-conductive (antistatic) floors.
See chapter 4.1 Function selection for instructions on
key functionality.
Figure 5.9: Insulation resistance
Test parameters for insulation resistance measurement
Uiso Test voltage [50 V, 100 V, 250 V, 500 V, 1000 V]
Limit
Minimum insulation resistance [OFF, 0.01 MΩ ÷ 200 MΩ]
Test circuits for insulation resistance
L1
L2
L3
N
PE
mains voltage
switched off
closed
switches
loads disconnected
N/L2
L
/
L
1
PE/L3
Figure 5.10: Connections for insulation measurement

METREL MI 3125 Specifications

General

Type	Multifunction Installation Tester
Insulation Resistance	Yes
Continuity Test	Yes
Loop Impedance	Yes
RCD Testing	Yes
Voltage Measurement	Yes
Frequency Measurement	Yes
Display	LCD
Power Supply	6 x 1.5 V AA batteries
Loop Resistance Resolution	0.01 Ω
Frequency	45 - 65 Hz
Line Voltage Resolution	1 V
Insulation Resistance Test Voltage	50 V, 100 V, 250 V, 500 V, 1000 V
Insulation Resistance Resolution	0.01 MΩ
Continuity Resistance Resolution	0.01 Ω
Test Current	200 mA
DC Voltage	Up to 600 V
Loop Resistance	0.0 Ω - 1999 Ω
Line Voltage	Up to 550 V
Line Voltage Accuracy	±2% ±2 digits
Rated Residual Current	10 mA, 30 mA, 100 mA, 300 mA, 500 mA
Insulation Resistance Range	0.01 MΩ to 1 TΩ
Continuity Resistance	0.0 Ω - 1999 Ω
Dimensions	220 x 103 x 55 mm
Operating Temperature	-10°C to 50°C
Storage Temperature	-20°C to +60°C
Safety Standards	EN 61557
Loop Resistance Accuracy	±(5% + 3 digits)