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METREL MI 3125 User Manual

METREL MI 3125
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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

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METREL MI 3125 Specifications

General IconGeneral
TypeMultifunction Installation Tester
Insulation ResistanceYes
Continuity TestYes
Loop ImpedanceYes
RCD TestingYes
Voltage MeasurementYes
Frequency MeasurementYes
DisplayLCD
Power Supply6 x 1.5 V AA batteries
Loop Resistance Resolution0.01 Ω
Frequency45 - 65 Hz
Line Voltage Resolution1 V
Insulation Resistance Test Voltage50 V, 100 V, 250 V, 500 V, 1000 V
Insulation Resistance Resolution0.01 MΩ
Continuity Resistance Resolution0.01 Ω
Test Current200 mA
DC VoltageUp to 600 V
Loop Resistance0.0 Ω - 1999 Ω
Line VoltageUp to 550 V
Line Voltage Accuracy±2% ±2 digits
Rated Residual Current10 mA, 30 mA, 100 mA, 300 mA, 500 mA
Insulation Resistance Range0.01 MΩ to 1 TΩ
Continuity Resistance0.0 Ω - 1999 Ω
Dimensions220 x 103 x 55 mm
Operating Temperature-10°C to 50°C
Storage Temperature-20°C to +60°C
Safety StandardsEN 61557
Loop Resistance Accuracy±(5% + 3 digits)

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