User Manual

GMC-I Messtechnik GmbH 23
6.5 Special Conditions
Note
Protection Class II Devices with Protection Class I Mains Plugs 
If the device under test is equipped with a pr
otection
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
recognizes whether or not test probe P1 is in contact with the
protective conductor, which is indicated by means of two different
acoustic signals. 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 Devices Under Test
Attention!
!
Deactivate the electrical system which supplies power to
the device under test before connecting the test instrument!
➭ 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 (only SECUTEST PRO or feature H01)
If the device under test is not equipped with a country-specific
mains plug which fits into the test socket at the SECUTEST, 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.
Measurements with test probe 1 against 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) automated test sequence (or
ange 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 is not the case, you’r
e 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
acc
essories have been connected for the selected measurement/
connection type.
A list of possible DUT connections dependin
g 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.
• D
etection of Probes / Measurement Cables 
During individual measurements
/ automated test sequences,
checking is conducted to determine whether or not the mea-
suring sockets requi
red for the measurement/sequence are
occupied.
• DUT connection detection (only with country-specific variant*) 
With the rotary switch in the AUTO/A1-A8 position, the “Test
Socket” connection type is selected automatically (if correspond-
ingly configured), if a mains plug is detected in the test socket.
•
Protection class detection (with country-specific version only *): With
the rotary switch in the AUTO/A1-A8 position, protection class I
or protection class II is selected automatically (if correspondingly
configured), depending on the detected type of mains plug.
•Short-Circuit Test
Before switching mains voltage to th
e device under test: test
for short-circuiting between L and N or L/N and PE. If applica-
ble additionally as “inspection test step” in automated test
sequences.
• On test (test of whether the device under test is switched on or off)
Automatic Recognition of States when Connecting DUTs and Probes
Control Function Condition
Short-circuit test L–N Shor
t-circuit / starting current of DUT R  2,5 
2)
No short-circuit (AC test) R > 2,5 
2)
Open-Circuit Voltage U
0
4.3 V, Short-Circuit Current I
K
< 250 mA
Short-circuit test LN
–PE Short-circuit R  2 k
No short-circuit (AC test) R > 2 k
Open-Circuit Voltage U
0
230 V AC, Short-Circuit Current I
K
< 1,5 mA
On test On (
passive DUT) R < 250 k
Off (active DUT) R > 300 k
Open-Circuit Voltage U
0
230 V AC, Short-Circuit Current I
K
< 1,5 mA
Special test No probe R > 2 M
Probe detected R < 500 k
Protection class detection (only for country-specific (earth-contact) plug variant)
1)
Protective conductor exists: PC I R < 1 
No protective conductor: PC II R > 10 
Safety shutdown
1)
Triggered at following residual current value (selectable) > 10 mA / > 30 mA
Triggered at following residual current values (selectable)
During leakage current measurement > 10 mA
During protective conductor resistance meas. > 250 mA
Connection test
(only for country-specific (earth-contact) plug variant)
1)
Checks whether the DUT is connected to the test socket.
Power line of DUT exists R < 1 
No power line of DUT R > 10 
Insulation test
DUT set up in a well-insulated fashion R 500 k
DUT set up in a poorly insulated fashion R < 500 k
PELine – PETestsocket: Open-Circuit Voltage U
0
500 V DC
3)
, I
K
< 2 mA
Overcurrent protection (shutdown)
Shutdown in the event of a continuous flow of current via the test socket:
Our test instruments
SECUTEST BASE(10)/PRO and SECULIFE ST
BASE(25)
allow for the active testing of devices with a nominal current
(load current) of up to 16 A.
The test socket of the respective test instrument is equipped with 16 A
fu
ses and the switching capacity of the internal relays also amounts to 16
A. Starting currents of up to 30 A are permissible.
For devices under test which are expected to featur
e a starting current of
more than 30 A, we strongly recommend the application of a test adapter
for higher starting currents: e. g. test adapter of the AT3 series
I > 16.5 A
1)
applies to M7050 with feature B00, B09 and B10
2)
applies as from version 1.7.0; 
previous condition ≤ 1.5 or > 1
.5 , respectively
3)
50 V DC as from version 2.1.0
Attention!
!
* Safety Shutdown 
As of 10 mA of differential current (can
also be set to
30 mA), automatic shutdown ensues within 100 ms. This
aut
omatic shutdown does not take place during leakage
current measurement with current clamp sensor or
adapter!