METREL MI 3125 User Manual

MI 3125 EurotestCOMBO Testing RCD
35
Displayed results:
t ...........Trip-out time,
Uc........Contact voltage for rated I
ΔN
.
5.5.3 Trip-out current (RCD I)
A continuously rising residual current is intended for testing the threshold sensitivity for
RCD trip-out. The instrument increases the test current in small steps through
appropriate range as follows:
Slope range Waveform
RCD type
Start value End value
Note
AC
0.2
×I
ΔN
1.1×I
ΔN
Sine
A (I
ΔN
≥ 30 mA) 0.2×I
ΔN
1.5×I
ΔN
A (I
ΔN
= 10 mA) 0.2×I
ΔN
2.2×I
ΔN
Pulsed
Both models
Maximum test current is I
Δ
(trip-out current) or end value in case the RCD didn’t trip-out.
Trip-out current measurement procedure
 Select the RCD function using the function selector switch.
 Set sub-function RCD I.
 Set test parameters (if necessary).
 Connect test cable to the instrument.
 Connect test leads to the item to be tested (see figure 5.18).
 Press the TEST key to perform the measurement.
Trip-out After the RCD is turned on again
Figure 5.21: Trip-out current measurement result example

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)