Rcd Testing; General Data; Contact Voltage Rcd-Uc - METREL MI 3125 Instruction Manual

MI 3125 EurotestCOMBO
Open-circuit voltage...........................6.5 VDC ÷ 9 VDC
Measuring current..............................min. 200 mA into load resistance of 2 Ω
Test lead compensation.....................up to 5 Ω
The number of possible tests ............> 2000, with a fully charged battery
Automatic polarity reversal of the test voltage.

7.3 RCD testing

7.3.1 General data

Nominal residual current (A,AC) ........10 mA, 30 mA, 100 mA, 300 mA, 500 mA,
Nominal residual current accuracy.....-0 / +0.1 ⋅ I Δ ; I Δ = I Δ N, 2 × I Δ N, 5 × I Δ N
Test current shape.............................Sine-wave (AC), pulsed (A)
DC offset for pulsed test current ........6 mA (typical)
RCD type ...........................................G (non-delayed), S (time-delayed)
Test current starting polarity ............. 0 º or 180 º
Voltage range ....................................50 V ÷ 264 V (45 Hz ÷ 65 Hz)
IΔN × 1/2
AC A
IΔN (mA)
10 5 3.5
30 15 10.5
100 50 35
300 150 105
500 250 175
1000 500 350
n.a......................................................not applicable
AC type..............................................sine wave test current
A type...... .........................................pulsed current

7.3.2 Contact voltage RCD-Uc

Measuring range according to EN61557 is 20.0 V ÷ 31.0V for limit contact voltage 25V
Measuring range according to EN61557 is 20.0 V ÷ 62.0V for limit contact voltage 50V
Measuring range (V)
0.0 ÷ 19.9
20.0 ÷ 99.9
The accuracy is valid if mains voltage is stabile during the measurement and PE
terminal is free of interfering voltages.
Test current ...................................... max. 0.5 × I
Limit contact voltage ......................... 25 V, 50 V
Specified accuracy is valid for complete operating range.
1000 mA
-0.1 ⋅ I Δ / +0; I Δ = 0.5 × I Δ N
AS / NZ selected: ± 5 %
IΔN × 1 IΔN × 2
AC A AC
10 20 20
30 42 60
100 141 200
300 424 600
500 707 1000 1410
1000 1410 2000 n.a.
Resolution (V)
0.1
50
Technical specification
IΔN × 5
A AC
40 50
84 150
282 500
848 1500 n.a.
2500 n.a.
n.a.
Accuracy
(-0 % / +15 %) of reading ± 10 digits
(-0 % / +15 %) of reading
ΔN
RCD IΔ
A AC A
100
212
707
n.a.