Gossen MetraWatt SECULIFE ST PRO, Manual, Page: 26 / 114

26 GMC-I Messtechnik GmbH
6.5 Special Conditions
Note
Protection Class II Devices with Protection Class I Mains Plugs
If the device under test 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 rec-
ognizes 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 in the
SETUP switch position in the
“ Auto Measurements” submenu via the “ Auto Measuring Point ” parameter.
Protective Conductor and Insulation Resistance Measurements for
Permanently Installed DUTs
Attention!
!
Deactivate the electrical system which supplies power to
the device under test before connecting the test instru-
ment!
➭
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)
Make sure that the contacted parts are not grounded.
6.6 2
nd
Test Probe (feature H01)
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, RINS and equivalent leak-
age current.
Measurements with test probe 1 to test probe 2 (P1 – P2) are
electrically isolated from the mains. There’s no voltage at the test
socket.
Attention!
!
Please note that during insulation measurement the
maximum test voltage of 500 V may be applied between
the probes.
6.7 Connection Prompts
If a single measurement (green rotary switch positions) or a spe-
cific (integrated) automatic test sequence (orange rotary switch
positions) is started, checking is conducted to determine whether
or not all of the probes and measurement cables required to this
end are connected (depending on the configuration level of your
SECUTEST...). If this isn’t the case, you’re prompted to connect
probes, measurement cables or the test adapter to the SECUT-
EST....
Checking is only conducted to determine whether or not the cor-
responding sockets are occupied – make sure that suitable
accessories have been connected for the selected measurement/
connection type.
A list of possible DUT connections depending on type of mea-
surement is included in section 11.2.
6.8 Connection Tests Conducted by the Test Instrument
The following measurements are performed automatically when
the DUT is connected to the test instrument.
• Detection of Probes / Measurement Cables
During individual measurements / automatic test sequences,
checking is conducted to determine whether or not the mea-
suring sockets required for the measurement/sequence are
occupied.
• DUT connection detection (only with country-specific variant *)
With the rotary switch in the A1-A9 position, the “Test Socket”
connection type is selected automatically (if correspondingly
configured), if a mains plug is detected in the test socket.
• Protection class detection (only with country specific variant *):
With the rotary switch in the A1-A9 position, protection class I
or II is selected (if correspondingly configured), depending on
the detected type of mains plug.
• Short-circuit test
Before switching mains voltage to the device under test: test
for short-circuiting between L and N or L/N and PE – if appli-
cable additionally as an “inspection test step” in automatic
test sequences.
• On test (test whether the DUT is switched on or off)
Automatic Recognition of States
when Connecting DUTs and Probes
1
Applies to M7050 with feature B00 and B09
and B10
Attention!
!
* Safety Shutdown
As of 10 mA of differential current (can also be set to
30 mA), automatic shutdown ensues within 500 ms.
This automatic shutdown does not take place during
leakage current measurement with clamp meter or
adapter.
Test Function Condition
Short-circuit testL–N Short-circuit / DUT starting current R
≤
2.5
Ω
2
No short-circuit (AC test) R > 2.5
Ω
2
Open-circuit voltage U
0
4.3 V, short-circuit current I
K
< 250 mA
Short-circuit testLN–PE short-circuit R
≤
2 k
Ω
No short-circuit (AC test) R > 2 k
Ω
Open-circuit voltage U
0
230 V AC, short-circuit current I
K
< 1.5 mA
On test On (DUT passive) R < 250 k
Ω
Off (DUT active) R > 300 k
Ω
Open-circuit voltage U
0
230 V AC, short-circuit current I
K
< 1.5 mA
Probe test No probe R > 2 M
Ω
Probe detected R < 500 k
Ω
Protection class detection (only with country specific variant
1
)
Protective conductor found: PC I R < 1
Ω
No protective conductor: PC II R > 10
Ω
Safety shutdown
1
Triggered at following residual current value (selectable) > 10 mA / > 30 mA
Triggered at following probe current values
During leakage current measurement > 10 mA
During protective conductor resistance measurement > 250 mA
Connection test (only with country specific variant
1
Checks whether the DUT is connected to the test socket.
DUT power cable found R < 1
Ω
No DUT power cable R > 10
Ω
Insulation test
DUT set up in a well-insulated fashion R
≥
500 k
Ω
DUT set up in a poorly insulated fashion R < 500 k
Ω
PE mains – PE socket: Open-circuit voltage U
0
50 V DC, I
K
< 2 mA
Overcurrent protection
Shutdown in the event of a continuous flow of current via the test
socket at:
Our
SECUTEST BASE(10) / PRO , SECULIFE ST BASE(25) and SECU-
LIFE ST PRO test instruments permit active testing of devices with
nominal current (load current) of up to 16 A.
The test socket on the respective test instrument is equipped with 16 A
fuses to this end, and the switching capacity of the internal relays is
also 16 A. Starting current of up to 30 A is permissible.
In the case of test objects for which a starting current of greater than
30 A can be expected, we urgently recommend the use of a test
adapter for larger starting currents, e.g. a test adapter from the AT3 se-
ries.
I > 16.5 A