METREL MI 3125 User Manual

MI 3125 EurotestCOMBO Testing RCD
36
Displayed results:
I ...........Trip-out current,
Uci Contact voltage at trip-out current I or end value in case the RCD didn’t
trip,
t ...........Trip-out time.
5.5.4 RCD Autotest
RCD autotest function is intended to perform a complete RCD test (trip-out time at
different residual currents, trip-out current and contact voltage) in one set of automatic
tests, guided by the instrument.
Additional key:
HELP / DISPLAY
Toggles between top and bottom part of results field.
RCD autotest procedure
RCD Autotest steps Notes
 Select the RCD function using the function selector switch.
 Set sub-function AUTO.
 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 test. Start of test
 Test with I
ΔN
, 0° (step 1).
RCD should trip-out
 Re-activate RCD.
 Test with I
ΔN
, 180° (step 2).
RCD should trip-out
 Re-activate RCD.
 Test with 2×I
ΔN
, 0° (step 3).
RCD should trip-out
 Re-activate RCD.
 Test with 2×I
ΔN
, 180° (step 4).
RCD should trip-out
 Re-activate RCD.
 Test with 5×I
ΔN
, 0° (step 5).
RCD should trip-out
 Re-activate RCD.
 Test with 5×I
ΔN
, 180° (step 6).
RCD should trip-out
 Re-activate RCD.
 Test with ½×IΔN, 0° (step 7).
RCD should not trip-
out
 Test with ½×IΔN, 180° (step 8).
RCD should not trip-
out

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)