Manual

36 Gossen Metrawatt GmbH
10 General Information on Measurements
10.1 Using Cable Sets and Test Probes
• Scope of delivery: 2-pole measuring adapter and cable for
expansion into a 3-pole adapter (PRO-A3-II/)
• Optional accessory: PRO-RLO II (Z501P) 2-pole measuring
adapter with 10 m cable
• Optional accessory: KS24 cable set (GTZ3201000R0001)
Measurements per DIN EN 61010-031 may only be performed in
environments in accordance with measuring categories III and IV
with the safety cap attached to the test probe at the end of the
measurement cable.
In order to establish contact inside 4 mm jacks, the safety caps
have to be removed by prying open the snap fastener with a
pointed object (e.g. the other test probe).
Attention!
!
Grip and hold the test plug and test probes securely
when they have been inserted, for example, into a
socket. Danger of injury exists if tugging at the coil cord
occurs, which may cause the test plug or test probes to
snap back.
10.2 Test Plug – Changing Inserts
The test plug can be fitted with various inserts (e.g. two-pole
measuring adapter or country-specific plug insert).
In order to change inserts, unscrew the retaining ring until you can
pull out the currently used insert. Then mount the desired insert
and retighten the retaining ring.
(See overview in section 5.4 on page 8.)
10.3 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 protective conductor PE 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-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. Connection is estab-
lished 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.
Touch 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.
10.4 Automatic Settings, Monitoring and Shutdown
The test instrument automatically selects all operating conditions
which it’s 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
.
Touch voltage which is induced by test current is monitored for
each measuring sequence. If touch 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 permissible limit value the instru-
ment 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
or 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 section 7.2). 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 s in addition to
the preset on-time for measurements with rising residual current
in systems with selective RCDs.
The instrument always shuts itself off automatically!
10.5 Measured Value Display and Memory
The following items appear at the display panel:
• Measured values with abbreviations and units of measure
• Selected function
• Nominal voltage
• Nominal frequency
• Error messages
Measured values for automatic measuring sequences are stored
and displayed as digital values until the next measurement
sequence is started, or until automatic shutdown 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.
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 reliable detection of touch voltages, both sensor surfaces on the
test plug must be touched with unprotected fingers/palm, i.e. with di-
rect skin contact (see also section 7).
• 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 touch current
U
IN
. Poor contact resistance at one of the contacts leads to