User Manual

60 GMC-I Messtechnik GmbH
14.7 Intelligent Ramp – ta+I Δ Function (PROFITEST MXTRA only)
14.7.1 Applications
The advantage of this measuring function in contrast to individual
measurement of I
ΔN
and t
A
is the simultaneous measurement of
breaking time and breaking current by means of a test current
which is increased in steps, during which the RCD is tripped only
once.
The intelligent ramp is
subdivided into time
segments of 300 ms
each between the initial
current value (35% I
ΔN
)
and the final current
value (130% I
ΔN
). This
results in a gradation for
which each step corre-
sponds to a constant
test current which is
applied for no longer
than 300 ms, assuming
that tripping does not
occur.
And thus both tripping
current and tripping time are measured and displayed.
Connection
Set Parameters
Start Contact Voltage Measurement
Start Tripping Test
The measurement sequence can be broken off prematurely at
any time by pressing the ON/START key.
Measurement Results
Nominal residual current:
Type 1: RCD, SRCD, PRCD etc.
Nominal current: 6 ... 125 A
Type 2: AC , A/F , B *
* Type B = AC/DC sensitive
10 ... 500 mA
Contact voltage:
< 25 V, < 50 V, < 65 V