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6.5 Special Conditions
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
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
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 (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.
Please note that during insulation measurement the
maximum test voltage of 500 V may be applied between
the probes.
6.7 Connection Prompts
Depending on which single measurement is selected (green rotary
switch position), and depending on DUT or adapter connection,
prompts appear regarding connection of the probes, and regard-
ing connection of measurement cables to the voltage measuring
inputs in the case of the SECUTEST PRO.
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.
• Connection test (detection of connection via either the test
socket or the voltage measuring inputs) (only with country-
specific earthing contact version)
• Protection class detection (with earthing contact connection
only: detection of whether or not the protective conductor is
connected)
•Short-Circuit Test
•
On test
(test of whether the device under test is switched on or off)
• Probe test (detection of whether or not test probe P1 is
plugged in)
• Electronic fuse (test of whether or not the fuse in the DUT is
tripped at a residual current of > 10 mA)
• Measurement of starting current (if starting current is greater than
16 A after 200 ms, the following message appears: “Use an
external adapter or another measuring method”)
Automatic Recognition of States when Connecting DUTs and
Probes
* Applies to standard models M7050-V001 and M7050-V002, as well as
M7050
with feature B00
* Safety Shutdown
As of 10 mA of differential current (can also be set to
30 mA), automatic shutdown ensues within 100 ms.
This automatic shutdown does not take place during
leakage current measurement with clamp meter or
adapter!
Control Function Condition
Short-circuit test Short-circuit / starting current R ≤ 1.5 Ω
No short-circuit (AC test) R > 1.5 Ω
On test On (DUT passive) R < 250 kΩ
Off (DUT active) R > 300 kΩ
Special test No probe R > 2 MΩ
Probe detected R < 500 kΩ
Protection class detection
(only with country-specific earthing contact version *)
Protective conductor found: PC I R < 1 Ω
No protective conductor: PC II R > 10 Ω
Safety shutdown *
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 earthing contact version *)
Checks whether the DUT is connected to the test socket.
Mains power cable of DUT found R < 1 Ω
Mains power cable of DUT missing R > 10 Ω
Insulation test
DUT set up in a well-insulated fashion R ≥ 500 kΩ
DUT set up in a poorly insulated fashion R < 500 kΩ
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