METREL MI 3125 - Standard and Optional Accessories

MI 3125 / MI 3125E EurotestCOMBO Quick-test guide
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2.2.4 RCD testing - 3 functions for testing RCDs.
Uc
 For testing contact voltage on exposed earthed conductive parts.
RCD t
 For testing the time it takes for an RCD to trip.
 Tripping currents can be multiplied by x1/2, x1, x2 and x5.
RCD I
 RCD ramp test.
 RCD ramp slowly increases the tripping current to find the minimum fault current
required to trip an RCD.
 Useful in faultfinding nuisance RCD tripping.
AUTO
 A automated test of the most important parameters associated with an RCD via one
press of a button.
 If a faulty parameter is noticed during the autotest, the test will stop to highlight the
need for further investigation.
1
Set function
2
Set subfunction
 Uc
 RCD t
 RCD I
 AUTO
3
Set parameters and limits
 Limit contact voltage (25 V, 50 V)
 Nominal differential RCD tripping current (10 mA ÷ 1000 mA)
 Multiplier of nominal differential RCD tripping current (x½, x1, x2, x5)
 RCD type [ , ], test current waveform plus starting polarity [ , , , ].