48
Gossen Metrawatt GmbH
Setting Measuring Parameters for RPE
1
Measurement cannot be performed with 10/25 A AC for this measurement
type.
2
Feature G01 (e.g. SECUTEST ST PRO / SECULIFE ST BASE): This type of
measurement can only be selected if a test current of 10 A AC has been
chosen.
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
rotary
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 A9 rotary switch positions.
The
icon is displayed in the header in all rotary switch posi-
tions until the offset value is deleted by pressing the
CLEAR OFFSET
softkey (rotary switch position R
PE
).
Protective Conductor Current Measurement with 25 A AC
In accordance with numerous product standards, at least 25 A
must be achieved with a load of 0.1
and a maximum voltage of
0.6 V.
Continuous protective conductor resistance measurement with a
test current of 25 A isn’t possible due to contact resistance at the
jacks.
If the test instrument is operated at room temperature, an uninter-
rupted
test duration of at least15 seconds
is possible. Under other
conditions, maximum test duration may be shorter and/or the
measurement may be prematurely terminated.
Attention!
!
Suitable measurement cables with a minimum wire
cross-section of 2.5 mm must be used when measuring
protective conductor resistances with a “25 A AC” test
current.
Included with the SECULIFE ST BASE25: suitable test
probe with
green
reinforcing sleeve.
For subsequent orders, we recommend the SK2-25A
test probe (Z746C).
Under certain circumstances, the required standard val-
ues might not be complied with if unsuitable accessories
are used.
Attention!
!
Measurement duration with a 25 A test current is limited
(see technical data).
An error message is generated if measurement duration
is exceeded which results in a temperature increase at
the test instrument.
Measuring
Parameter
Meaning
Meas. Type
Suitable for
DUT Connection via
(passive:) PE(TS)
– P1
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-
IIIE, AT3-IIS, AT3-IIS32),
AT16DI/AT32DI
Active: PE(TS) –
P1
1
Same as
PE(TS) – P1
, but with
line voltage to the test socket –
200 mA AC flows immediately.
A ramp-like, slowly rising DC test
current flows (PRCD triggering is
avoided) at +200 mA DC, -
200 mA DC and
200 mA DC.
Test socket (for PRCDs)
PE(mains) – P1
Permanently
connected DUTs
Testing is conducted between the
ground terminal at the mains and
test probe P1.
Permanent connection
P1 – P2
Feature H01(e.g. SECUTEST ST
PRO/SECULIFE ST BASE):
2-pole measurement between
test probes 1 and 2 (see section
13.7)
Permanent connection
Clamp
2
Features G01 and I01
(e.g. SECUTEST ST PRO/
SECULIFE ST BASE):
Test current measurement with
current 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
seconds
200 mA (AC)
Test current: alternating current, adjustable frequency f, see below
10 A (AC)
10 A test current, only with feature G01 (e.g. SECUTEST ST BASE(10) or
PRO)
25 A (AC)
25 A test current, only with feature G02 (e.g. SECULIFE ST BASE25)
f – only at 200 mA (AC)
50 ... 200 Hz
Test frequency (adjustable in steps: 50, 60, 110, 150, 200 Hz)
Offset
> 0 ... < 5
Zero balancing for a selected reference point.
Clamp factor
– only for clamp measurement type
1 mV : 1 mA
Transformation ratio of the WZ12C current clamp sensor.
For setting the current clamp factor at the WZ12C clamp and the
SECUTEST ST PRO (see table above).
Содержание SECULIFE ST BASE 25
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