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Gossen Metrawatt PROFITEST MXTRA Manual

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GMC-I Messtechnik GmbH 71
17 Operating and Display Elements
Test Instrument and Adapter
(1) Control Panel – Display Panel
The following are displayed at the LCD:
• One or two measurement values as three place numeric dis-
play with unit of measure and abbreviated measured quantity
• Nominal values for voltage and frequency
• Circuit diagrams
• On-line help
• Messages and instructions
The display and control panel can be swiveled forward or back-
ward with the detented swivel hinge. The instrument can thus be
set to the optimum reading angle.
(2) Eyelets for the Shoulder Strap
The included shoulder strap can be attached at the right and left
hand sides of the instrument. You can hang the instrument from
your shoulder and keep both hands free for measurement.
(3) Rotary Selector Switch
The following basic functions can be selected with this rotary
switch:
SETUP / I
N
/ I
F
/ Z
L-PE
/ Z
L-N
/ R
E
/ R
LO
/ R
ISO
/ U / SENSOR /
EXTRA / AUTO
The various basic functions are selected by turning the function
selector switch while the instrument is switched on.
(4) Measuring Adapter
Attention!
!
The measuring adapter (2-pole) may only be used to-
gether with the test instrument’s test plug.
Use for other purposes is prohibited!
The plug-on measuring adapter (2-pole) with the two test probes
is used for measurements in systems without earthing contact
outlets, e.g. at permanent installations, distribution cabinets and
all three-phase outlets, as well as for insulation resistance and
low-value resistance measurements.
The 2-pole measuring adapter can be expanded to three poles for
phase sequence testing with the included measurement cable
(test probe).
(5) Plug Insert (country-specific)
Attention!
!
The plug insert may only be used together with the test
instrument’s test plug.
Use for other purposes is prohibited!
After the plug insert has been attached, the instrument can be
directly connected to earthing contact outlets. You need not con-
cern yourself with poling at the plug. The instrument detects the
positions of phase conductor L and neutral conductor N and
automatically reverses polarity if necessary.
The instrument automatically determines whether or not both pro-
tective contacts in the earthing contact outlet are connected to
one another, as well as to the system protective conductor, for all
types of protective conductor measurements when the plug insert
is attached to the test plug.
(6) Test Plug
The various country specific plug inserts (e.g. protective contact
plug insert for Germany or SEV plug insert for Switzerland) or the
measuring adapter (2-pole) are attached to the test plug and
secured with a threaded connector.
The controls on the test plug are subject to interference suppres-
sion filtering. This may lead to slightly delayed responses as
opposed to controls located directly on the instrument.
(7) Alligator Clip (plug-on)
(8) Test Probes
The test probes comprise the second (permanently attached) and
third (plug-on) poles of the measuring adapter. A coil cable con-
nects them to the plug-on portion of the measuring adapter.
(9) ON/Start t Key
The measuring sequence for the func-
tion selected in the menu is started by
pressing this key, either on the test
plug or at the control panel. Exception: If the instrument is
switched off, it can only be switched on by pressing the key at the
control panel.
This key has the same function as the t key on the test plug.
(10) I
N
/ I Key (at the control panel)
The following sequences are triggered
by pressing this key, either on the test
plug or at the control panel:
• Starts the tripping test after measurement of contact voltage
for RCCB testing (I
N
).
• Measurement of R
OFFSET is started within the R
LO
/ Z
L-N
function.
• Semiautomatic polarity reversal (see section 5.8)
(11) Contact “Surfaces
The contact surfaces are located at both sides of the test plug.
When the contact plug is grasped in the hand, contact is automati-
cally made with these surfaces. The contact surfaces are electri-
cally isolated from the terminals and from the measuring circuit.
When the rotary switch is set to the “U” position, the instrument
can be used as a phase tester for protection class II devices!
In the event of a potential difference of greater than 25 V between
protective conductor terminal PE and the contact surface, PE is
displayed (see also section 18, “LED Indications, Mains Connec-
tions and Potential Differences”, beginning on page 73).
(12) Test Plug Holder
The test plug with attached plug insert can be reliably secured to
the instrument with the rubberized holder.
(13) Fuses
The two type FF 3.15 A / 600 V fuses protect the instrument
against overload. Phase conductor L and neutral conductor N are
fused individually. If a fuse is defective, and if an attempt is made
to perform a measurement which uses the circuit protected by
this fuse, a corresponding message appears at the display panel.
Attention!
!
Severe damage to the instrument may occur if incorrect
fuses are used.
Only original fuses from GMC-I Messtechnik GmbH as-
sure required protection by means of suitable blowing
characteristics (order no. 3-578-189-01).
Note
The voltage ranges remain functional even if fuses have
blown.
(14) Holders for Test Probes (8)
(15/16) Current Clamp Sockets
Only the current clamp transformers offered as accessories may
be connected to these sockets.
(17) Probe Connector Socket
The probe connector socket is required for the measurement of
probe voltage U
S-PE
, earth electrode voltage U
E
, earthing resis-
tance R
E
and standing surface insulation resistance.
It can be used for the measurement of contact voltage during
RCD testing. The probe is connected with a 4 mm contact pro-
tected plug.
… 71 …


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