METREL MI 3125 User Manual

MI 3125 EurotestCOMBO Testing RCD
34
RCD type
Contact voltage Uc
proportional to
Rated I
ΔN
AC G
1.05×I
ΔN
AC
S
2×1.05×I
ΔN
any
A G
1.4×1.05×I
ΔN
A
S
2×1.4×1.05×I
ΔN
≥ 30 mA
A G
2×1.05×I
ΔN
A
S
2×2×1.05×I
ΔN
< 30 mA
Both models
Table 5.1: Relationship between Uc and I
Δ N
Loop resistance is indicative and calculated from Uc result (without additional
proportional factors) according to:
N
C
L
I
U
R
Δ
= .
UK version
Figure 5.19: Example of contact voltage measurement results
Displayed results:
Uc........Contact voltage.
Rl.........Fault loop resistance.
5.5.2 Trip-out time (RCDt)
Trip-out time measurement verifies the sensitivity of the RCD at different residual
currents.
Trip-out time measurement procedure
 Select the RCD function using the function selector switch.
 Set sub-function RCDt.
 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.
Figure 5.20: Example of trip-out time measurement results

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)