METREL MI 3125 Short Instructions

MI 3125 / MI 3125E EurotestCOMBO Quick-test guide
18
2.2.4 RCD testing - 3 functions for testing RCDs.
Uc
 For testing contact voltage on exposed earthed conductive parts.
RCD t
 For testing the time it takes for an RCD to trip.
 Tripping currents can be multiplied by x1/2, x1, x2 and x5.
RCD I
 RCD ramp test.
 RCD ramp slowly increases the tripping current to find the minimum fault current
required to trip an RCD.
 Useful in faultfinding nuisance RCD tripping.
AUTO
 A automated test of the most important parameters associated with an RCD via one
press of a button.
 If a faulty parameter is noticed during the autotest, the test will stop to highlight the
need for further investigation.
1
Set function
2
Set subfunction
 Uc
 RCD t
 RCD I
 AUTO
3
Set parameters and limits
 Limit contact voltage (25 V, 50 V)
 Nominal differential RCD tripping current (10 mA ÷ 1000 mA)
 Multiplier of nominal differential RCD tripping current (x½, x1, x2, x5)
 RCD type [ , ], test current waveform plus starting 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)