User Manual

GMC-I Messtechnik GmbH 29
Wiring Diagram
Resistance is measured:
• Between each exposed conductive part of the housing and the
earthing contacts at the mains and the device plug (if a
removable mains connector cable is used), or the protective
conductor terminal for permanently installed devices.
• As 4-pole measurement
• Between the earthing contacts
at the mains plug and the
earthing contacts at the device plug for device connector cables
• Between the earthing contacts
at the mains plug and the
earthing contacts at the coupling socket for extension cords
Setting Measuring Parameters for RPE
Measuring 
Parameter
Meaning
Measurement Type,
Suitable for 
DUT Connection via
(passive:) PE(TS)
– P
1
Testing is conducted between the
two protective conductor terminals:
at the test socket and test probe
P1.
Test socket, EL1 with DUT at test
socket, VL2E, AT3 adapter (AT3-
I I I E, AT3-I IS, AT3-I IS32),
A
T16DI/AT32DI
Active: PE(TS) –
P1
1
Same as PE(TS) – P1, but with
line voltage to the test socket,
200 mA AC flow immediately.
A ramp-like, slowly rising DC test
cu
rrent flows (PRCD triggering is
avoided) at +200 mA DC, –
200 mA DC and 200 mA DC.
Test socket (for PRCDs)
PE(mains) – P1
permanently con-
nected DUTs
Testing is conducted between the
gr
ound terminal at the mains and
test probe P1.
Permanent connection
P1 – P2
SECUTEST PRO/SECULIFE ST BASE
or feature H01:

2-pole measurement between
test probes 1 and 2 (see section
6.6)
Permanent connection
Clamp
2
SECUTEST PRO/SECULIFE ST BASE 
or feature G01
and I01:
Test current measurement with
cu
rrent clamp sensor
Permanent connection
IP(set)
+200 mA DC Test current: positive direct current
-200 mA DC Test current: negative direct current
200 mA (DC) Test current: direct current whose polarity is reversed every 2 secs.
200 mA (AC) Test current: alternating current
10 A (AC)
10 A test current: SECUTEST BASE10 or PRO only (feature G01)
25 A (AC) 25 A test current: SECULIFE ST BASE 25 only (feature G02)
f – only at 200 mA (AC)
50 ... 200 Hz Test frequency
Offset
> 0 to < 2  Zero balancing for a selected reference point.
Clamp factor – only with measuring type „Clamp“
1 mV : 1 mA Transformer ratio of the current clamp sensor WZ12C. 
For setting the current clamp factor at the W
Z12C clamp and the
SECUTEST PRO (see table above).
100 mV:1 mA Transformer ratio of the current clamp sensor SECUTEST CLIP. 
For setting the current clamp factor at the SECUTEST PRO.
1
SECUTEST BASE10/PRO (feature G01): Measurement cannot be performed
with 10 A AC/25 A AC for this measurement type.
2
SECUTEST PRO /SECULIFE ST BASE (feature G01): This measurement type
can only be selected with a selected test current of 10 A AC.
Entering and Deleting Offset Values
The test instrument determines protective conductor resistance
by means of a 4-pole measurement. If measurement cables or
extension cords are used whose ohmic resistance should be
automatically subtracted from the measurement results, there are
two ways to save the respective offset value in the R
PE
switch
position:
• Entry via the numeric keypad
• Acceptance of the momentary measured value by pressing
the
SET OFFSET softkey
Proceed as follows in order to accept the measured value:
➭ Start the measurement and wait until the measured value settles in.
➭ Press the SET OFFSET key. The value is transferred to the offset field.
The entered or accepted offset value is permanently stored and is
subtracted from all protective conductor resistance values mea-
sured in the future. This applies to single measurements as well
as to measurements conducted in the AUTO switch positions. 
The
symbol is displayed in the header in all switch positions
until the offset value is deleted by pressing the CLEAR OFFSET soft-
key (R
PE
switch position).
Protective Conductor Current Measurement with 25 A AC
In accordance with IEC 60601, at least 25 A must be achieved
with a load of 0.1  and
a maximum voltage of 0.6 V.
By means of contact resistances at the
jacks, continuous opera-
tion of protective conductor resistance measurement with a test
curr
ent of 25 A is not possible.
If the test instrument is operated in room temperature, an uninter-
rupted test dur
ation of 15 seconds is at least possible. Under deviat-
ing conditions, the attainable test duration may be shorter and/or
the mea
surement is prematurely terminated.
Attention!
!
For measuring protective conductor resistances with a
„25
A AC“ test current, appropriate measurement cables
with a minimum cable cross section of 2.5 mm are to be
us
ed.
Standard equipment of SECULIFE ST BASE 25: suitable test
probe with green kink protection grommet. 
For repeat orders we recommend test probe SK2-25A
(Z746C). 
The required standard values
may possibly not be
achieved by using inappropriate accessories.
Attention!
!
The measuring duration with a test current of 25 A is lim-
ited (see Characteristic Values). 
If the test duration is exceeded, which results in a tem-
perature increase of the test instrument, an error mes-
sage is generated.