METREL MI 3125 User Manual

MI 3125 EurotestCOMBO Testing RCD
32
5.5 Testing RCDs
Various test and measurements are required for verification of RCD(s) in RCD protected
installations. Measurements are based on the EN 61557-6 standard.
The following measurements and tests (sub-functions) can be performed:
 Contact voltage,
 Trip-out time,
 Trip-out current,
 RCD autotest.
See chapter 4.1 Function selection for instructions on
key functionality.
Figure 5.17: RCD test
Test parameters for RCD test and measurement
TEST RCD sub-function test [RCDt, RCD I, AUTO, Uc].
I
ΔN
Rated RCD residual current sensitivity I
ΔN
[10 mA, 30 mA, 100 mA, 300 mA,
500 mA, 1000 mA].
type
RCD type [ , ], test current waveform plus starting polarity [ , , , ].
MUL
Multiplication factor for test current [½, 1, 2, 5 I
ΔN
].
Ulim Conventional touch voltage limit [25 V, 50 V].
Notes:
 Ulim can be selected in the Uc sub-function only.
The instrument is intended for testing of General (non-delayed) and
S
elective (time-
delayed) RCDs, which are suited for:
 Alternating residual current (AC type, marked with symbol),
 Pulsating residual current (A type, marked with symbol).
 Pulsating residual current (A type, marked with symbol).
Time delayed RCDs have delayed response characteristics. As the contact voltage pre-
test or other RCD tests influence the time delayed RCD it takes a certain period to
recover into normal state. Therefore a time delay of 30 s is inserted before performing
trip-out test by default.

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)