Datasheet
PROFITESTMASTER SERIES
PROFITESTMTECH+, MPRO, MXTRA, MBASE+
IEC 60364-6, EN 50110-1
12 Gossen Metrawatt GmbH
Leakage Current Measurement with PRO-AB Adapter
Measurement of continuous leak-
age and patient auxiliary current
per IEC 62353 / IEC 601-1 /
EN 60 601-1 (Medical electrical
equipment – General requirements
for basic safety) is possible with
the help of the PRO-AB leakage
current measuring adapter used
as an accessory with the
PROFITEST MXTRA test instru-
ment.
As specified in the standards listed
above, current values of up to 10 mA can be measured with this
measuring adapter.
In order to be able to fully cover
this measuring range using the
measurement input provided on
the test instrument (2-pole current
clamp input), the measuring
instrument is equipped with range
switching including transformation
ratios of 10:1 and 1:1.
Determination of Residual Voltage / Detection of Mains Fluctuation
EN 60204 specifies that after
switching supply power off, resid-
ual voltage between L and PE
must drop to a value of 60 V or
less within 5 seconds at all acces-
sible, active components of a
machine to which a voltage of
greater that 60 V is applied during
operation.
With the PROFITEST MXTRA,
testing for the absence of voltage
is performed as follows by means
of a voltage measurement which involves measuring discharge
time tu:
In the case of voltage dips of
greater than 5% of momentary line
voltage (within 0.7 seconds), the
stopwatch is started and momen-
tary undervoltage is displayed as
Ures after 5 seconds and indi-
cated by the red U
L
/R
L
diode.
Intelligent Ramp
The advantage of this measuring function in contrast to individual
measurement of I
N
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
N
) and the final cur-
rent value (130% I
N
). This results in a gradation for which each
step corresponds 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.
Testing of Residual Current Monitoring Devices (RCMs)
Residual current monitors (RCMs) monitor residual current in elec-
trical systems and display it continuously. As is also the case with
residual current devices, external switching devices can be con-
trolled in order to shut down supply power in the event that a
specified residual current value is exceeded. However, the advan-
tage of an RCM is that the user is informed of fault current within
the system before shutdown takes place.
As opposed to individual measurement of I
N
and t
A
, measure-
ment results must be evaluated manually in this case.
If an RCM is used in combination with an external switching
device, the combination must be tested as if it were an RCD.