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GMC-I Messtechnik GmbH 13
5 General Notes
5.1 Connecting the Instrument
For systems with earthing contact sockets, connect the instru-
ment to the mains with the test plug to which the appropriate,
country-specific plug insert is attached. Voltage between phase
conductor L and the PE protective conductor may not exceed
253 V!
Poling at the socket need not be taken into consideration. The
instrument detects the positions of phase conductor L and neu-
tral conductor N and automatically reverses polarity if necessary.
This does not apply to the following measurements:
– Voltage measurement in switch position U
– Insulation resistance measurement
– Low-value resistance measurement
The positions of phase conductor L and neutral conductor N are
identified on the plug insert.
If measurement is to be performed at three-phase outlets, at dis-
tribution cabinets or at permanent connections, the measuring
adapter must be attached to the test plug (see also table 16.1).
Connection is established with the test probes: one at PE or N
and the other at L.
The 2-pole measuring adapter must be expanded to 3 poles with
the included measurement cable for the performance of phase
sequence testing.
Contact voltage (during RCCB testing) and earthing resistance
can be, and earth-electrode potential, standing surface insulation
resistance and probe voltage must be measured with a probe.
The probe is connected to the probe connector socket with a
4 mm contact protected plug.
5.2 Automatic Settings, Monitoring and Shut-Off
The test instrument automatically selects all operating conditions
which it is capable of determining itself. It tests line voltage and
frequency. If these lie within their valid nominal ranges, they
appear at the display panel. If they are not within nominal ranges,
prevailing voltage (U) and frequency (f) are displayed instead of U
N
and f
N
.
Contact voltage which is induced by test current is monitored for
each measuring sequence. If contact voltage exceeds the limit
value of > 25 V or > 50 V, measurement is immediately inter-
rupted. The U
L
/R
L
LED lights up red.
If battery voltage falls below the allowable limit value the instrument
cannot be switched on, or it is immediately switched off.
The measurement is interrupted automatically, or the measuring
sequence is blocked (except for voltage measuring ranges and
phase sequence testing) in the event of:
• Impermissible line voltages (< 60 V, > 253 V / > 330 V /
> 440 V or > 550 V) for measurements which require line volt-
age
• Interference voltage during insulation resistance or low resis-
tance measurements
• Overheating at the instrument.
As a rule, excessive temperatures only occur after approxi-
mately 50 measurement sequences at intervals of 5 seconds,
when the rotary selector switch is set to the Z
L-PE
oder Z
L-N
position.
If an attempt is made to start a measuring sequence, an
appropriate message appears at the display panel.
The instrument only switches itself off automatically after comple-
tion of an automatic measuring sequence, and after the predeter-
mined on-time has expired (see sectionl 4.3). On-time is reset to
its original value as defined in the setup menu, as soon as any key
or the rotary selector switch is activated.
The instrument remains on for approximately 75 seconds in addi-
tion to the preset on-time for measurements with rising residual
current in systems with selective RCDs.
The instrument always shuts itself off automatically!
5.3 Measurement Value Display and Memory
The following appear at the display panel:
• Measurement values with abbreviations and units of measure
• Selected function
• Nominal voltage
• Nominal frequency
• Error messages
Measurement values for automatic measuring sequences are
stored and displayed as digital values until the next measurement
sequence is started, or until automatic shut-off occurs.
If the upper range limit is exceeded, the upper limit value is dis-
played and is preceded by the “>” symbol (greater than), which
indicates measurement value overrun.
Note
The depiction of LEDs in these operating instructions
may vary from the LEDs on the actual instrument due to
product improvements.
5.4 Testing Earthing Contact Sockets for Correct Connection
The testing of earthing contact sockets for correct connection
prior to protective measures testing is simplified by means of the
instrument’s error detection system.
The instrument indicates improper connection as follows:
• Impermissible line voltage (< 60 V or > 253 V):
The MAINS/NETZ LED blinks red and the measuring
sequence is disabled.
• Protective conductor not connected or potential to earth 50 V
at 50 Hz (switch position U – single-phase measurement):
If the contact surfaces are touched (finger contact*) while PE is
being contacted (via the country-specific plug insert, e.g.
SCHUKO, as well as via the PE test probe at the 2-pole
adapter) PE appears (only after a test sequence has been
started). The U
L
/R
L
and RCD/FI LEDs light up red as well.
* for reliably detecting the contact voltages, both sensor surfaces at
the test plug must be touched directly with the finger/palm without
any skin protection applied, see also section 4.1.
• Neutral conductor N not connected (during mains dependent
measurements):
The MAINS/NETZ LED blinks green.
• One of the two protective contacts is not connected:
This is checked automatically during testing for contact cur-
rent U
IN
. Poor contact resistance at one of the contacts
leads to one of the following displays, depending upon poling
of the plug:
– Display at the connection pictograph:
PE interrupted (x), or underlying protective
conductor bar interrupted with reference
to keys at the test plug
Cause: voltage measuring path interrupted
Consequence: measurement is disabled
– Display at the connection pictograph:
Overlying protective conductor bar inter-
rupted with reference to keys at the test
plug
Cause: current measuring path interrupted
Consequence: no measured value display
Note
See also “LED Indications, Mains Connections and
Potential Differences” beginning on page 73.
Attention!
!
Reversal of N and PE in a system without RCCBs cannot
be detected and is not indicated by the instrument.
In a system including an RCCB, the RCCB is tripped
during “contact voltage measurement without RCCB
tripping” (automatic Z
L-N
measurement), insofar as N and
PE are reversed.
… 13 …

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