Gossen Metrawatt GmbH
39
13.2
Residual Current Monitoring
For your safety, the test instrument is equipped with continuous
residual current monitoring. If residual current exceeds a specified
limit value, all measuring processes are stopped, and if line volt-
age is fed through the test socket it’s disconnected. This limit
value can be set to one of two levels with the rotary switch in the
SETUP
position:
Setup 1/3 > All Measurements 2/2 > Residual Current Protection >
10 mA
/30 mA
Attention!
!
However, shutdown does not fulfill the requirements
specified for a PRCD.
13.3
Reference Voltage L-PE and Alternative Test Sequence
Specifying Reference Voltage L-PE
Reference (line) voltage is the voltage to which the measured val-
ues for leakage current have been standardized.
It’s used in the case of leakage current for mathematical adapta-
tion of measured current values to the specified voltage.
Measurements with line voltage at the test socket:
The setting value
has no influence on the voltage with which the test object is sup-
plied via the test instrument’s test socket.
Leakage current measurements with “Alternative” method:
The set-
point value of the synthetic test voltage is derived from the value
specified here.
Note
The displayed measured values for leakage current are
standardized to an adjustable reference value (typically
230 V) in order to permit reproducible measurement of
leakage current even with fluctuating mains supply volt-
age.
Reference voltage can be adjusted in Setup:
Setup 1/3 > All Measurements 1/2 >
Ref. Voltage L-PE
Specifying an Alternative Test Frequency
Selectable frequency setpoint value for synthetic test voltage for
all leakage current measurements of measurement type “Alterna-
tive”, affecting the following measurements and/or rotary selector
switch positions:
–
Single measurements (rotary switch level: green)
–
Measurements included in preconfigured, integrated test
sequences
–
Measurements included in user-defined test sequences (only with
SECUTEST DB+ database extension – Z853R or feature KB01)
The
Alt. Test Freq.
parameter can be set in Setup:
Setup 1/3 > All Measurements 1/2 >
Alt. Test Freq.
13.4
Manually Specifying the Connection Type for Single Mea-
surements
In the case of single measurements, the test instrument is unable
to detect the respective
connection type
(e.g. test socket or perma-
nent connection (voltage measuring inputs)). The connection type
must be specified manually.
➭
Select
parameter settings
.
➭
After selecting the
measurement type
parameter, a list of possi-
ble connection types is displayed.
➭
Select a
connection type
.
Once a connection type has been selected, it remains active for all
following tests until it’s changed again.
13.5
Manually Selecting a Connection Type / Protection Class
For Test Sequences
If the test instrument is unable to detect the respective connection
type or protection class, the suggested connection type must be
examined and the connection type or protection class must be
specified manually if necessary.
➭
Press the
Sel
key shown at the right in order to display
the
Classif. Parameters
.
➭
After selecting the
protection class
or
connection type
parameter,
a list of possible settings is displayed.
➭
Select the respective parameter.
➭
Acknowledge the
Classif. Param
once again (classification pa-
rameters).
The connection type appears at the middle of the header.
The symbol for the respective protection class appears to the
right of the connection type.
Once a connection type or a protection class has been selected, it
remains active for all following tests until it’s changed again.
13.6
Special Conditions
Note
Protection Class II DUTs with Protection Class I Mains Plug
If the DUT is equipped with a protection class I plug
although it complies with protection class II, protection
class I is recognized by the test instrument. If this is the
case, switch the protection class parameter from I to II.
Testing Several Protective Conductor Connections with the Func-
tion for “Automatic Detection of Measuring Point Changes”
During protective conductor measurement, the test instrument recog-
nizes whether or not test probe P1 is in contact with the protective
conductor, which is indicated by means of two different acoustic sig-
nals. This function can be adjusted with the rotary switch in the
SETUP
position via the “
Auto Measuring Point
” parameter in the “
Auto
Measurements
” submenu.
Protective Conductor and Insulation Resistance Measurements for
Permanently Installed DUTs
Attention!
!
Before connecting the DUT, deactivate the electrical sys-
tem which supplies power to it!
➭
Remove the mains fuses from the device under test and dis-
connect neutral conductor N inside the device under test.
Touch Current Measurement (absence of voltage)
Note
Make sure that the contacted parts are not inadvertently
grounded.
If ungrounded parts are connected to grounded parts
when contacting parts for the touch current measure-
ment, touch current bypasses the probe and is dis-
charged to ground.
13.7
2
nd
Test Probe (only with feature H01, e.g. SECUTEST ST
PRO)
If the device under test isn’t equipped with a country-specific
mains plug which fits into the test socket at the test instrument, or
if a permanently installed DUT is involved, the second test probe,
in combination with the first test probe, permits 2-pole measure-
ment (dual-lead-measurement) of RPE, RISO and equivalent leak-
age current.
Summary of Contents for SECULIFE ST BASE 25
Page 111: ...Gossen Metrawatt GmbH 111 ...
