GMC-I Messtechnik GmbH
47
(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
resistance 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
protected plug.
The instrument determines whether or not the probe has been
properly set and displays results at the display panel.
(18) USB Port
The USB port allows for the exchange of data between the test
instrument and a PC.
(19) RS 232 Port
This connection allows for data entry by means of a barcode
scanner or an RFID reader.
(20) Charging Socket
Only the Z502P charger for charging batteries inside the test
instrument may be connected to this socket.
(21) Battery Compartment Lid – Replacement Fuses
Attention!
!
When the lid is removed, the instrument must be
disconnected from the measuring circuit at all poles!
The battery compartment lid covers the battery holder with the
rechargeable batteries and the replacement fuses.
The battery holder is designed for use with eight 1.5 V AA
batteries in accordance with IEC LR 6 for supplying power to the
instrument. Make certain that battery polarity corresponds the
symbols when inserting the rechargeable batteries.
Attention!
!
Make sure that all of the rechargeble batteries are
inserted with correct polarity. If just one battery is
inserted with reversed polarity, it will not be recognized
by the instrument and may result in battery leakage.
Two replacement fuses are located beneath the battery
compartment lid.
Control Panel – LEDs
MAINS/NETZ LED
This LED is only functional when the instrument is switched on. It
has no function in voltage ranges U
L-N
and U
L-PE
.
It lights up green, red or orange, or blinks green or red, depending
upon how the instrument has been connected and the selected
function (compare section 18.1, “LED Indications, Mains Connec-
tions and Potential Differences”, beginning on page 51).
This LED also lights up if line voltage is present during
measurement of R
INS
and R
LO
.
UL/RL LED
This LED lights up red if contact voltage is greater than 25 V or
50 V during RCD testing, as well as after safety shut-down
occurs. It also lights up if R
INS
or R
LO
limit values have been
exceeded or fallen short of.
RCD LED • FI
This LED lights up red if the RCCB is not tripped within 400 ms
(1000 ms for selective RCCBs of the RCD S type) during the trip-
ping test with nominal residual current.
It also lights up if the RCCB is not tripped before nominal residual
current has been reached during measurement with rising
residual current.
