METREL MI 3125 User Manual

MI 3125 InstaltestCOMBO Resistance of earth connection
31
5.4.1 R LOWΩ, 200 mA resistance measurement
The resistance measurement is performed with automatic polarity reversal of the test
voltage.
Test circuit for R LOWΩ measurement
Figure 5.13: Connection of universal test cable plus optional extension lead
Resistance to earth connection and equipotential bonding measurement procedure
 Select continuity function using the function selector switch.
 Set sub-function to R LOWΩ.
 Enable and set limit (optional).
 Connect test cable to the instrument.
 Compensate the test leads resistance (if necessary, see section 5.1).
 Disconnect from mains supply and discharge installation to be tested.
 Connect the test leads to the appropriate PE wiring (see figure 5.13).
 Press the TEST key to perform the measurement.
Figure 5.14: Example of RLOW result
Displayed result:
R................R LOWΩ resistance.
R+..............Result at positive polarity
R-...............Result at negative test polarity

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)