Gossen Metrawatt AT3-I I S Operating Instructions

Operating Instructions

Attention!

!

Note!

!

AT3-II S

CEE Adapter 16 (20) A
for Testing Protective Conductor Current in Operating Condition

3-349-337-03

5/7.14

1 Application

With the AT3-II S CEE adapter, devices which are equipped with
a 16A/6h or 32A/6h 5-pin CEE plug can be quickly and efficiently
connected to test instruments designed for testing portable
devices in accordance with DIN VDE 0701-0702, or for testing in
accordance with IEC 62353 (VDE 0751), and which are furnished
with only an earthing contact outlet.

The following tests can be performed on devices with CEE plugs
with the help of the AT3-II S adapter:

• Testing of protective conductor continuity

• Insulation resistance measurement

•

Measurement of Protective Conductor Current in measuring mode
– direct (direct method via test socket)
– differential (differential current measuring method)

alternative (equivalent leakage current measurement method)

–

Application Restrictions
The AT3-II S CEE adapter may only be used for test
purposes in combination with a test instrument. Other use
of the adapter, in particular for continuous connection of
3-phase current devices to 3-phase electrical systems, is
not permissible under any circumstances!
In any case, maximum permissible conventional thermal
current is 16 A AC per phase.

2 Safety Features and Precautions

The AT3-II S CEE-Adapter is manufactured and tested in
accordance with safety regulations IEC 61010-1 / EN 61 010-1 /
VDE 0411-1. If used for its intended purpose, the safety of the
user and of the device is assured.

Carefully read the operating instructions before use, in particular
the operating instructions included with the test instrument with
which you intend to use the adapter. Follow all instructions
contained therein.

The adapter may only be used for testing devices with 5-pin CEE
plugs and current consumption of no greater than 3 x 20 A (AC-1).

The AT3-II S CEE adapter may not be used:

• With open housing

• If it demonstrates visible damage

• If the CEE outlet or the connector cable is damaged

• After excessive stress, i.e. if the load capacities specified in
the technical data have been exceeded

• After long periods of storage under unfavorable conditions
(e.g. humidity, dust or extreme temperature)

Meanings of Symbols on the Instrument

Warning concerning a point of danger
(attention: observe documentation!)

CAT II Measuring category II device

Indicates EC conformity
Harmlessness with regard to interference emission and
interference immunity in accordance with
EN 61326:2000 / EN 61000-2 / EN 61 000-4

The device may not be disposed of with the trash.
Further information regarding the WEEE mark can be
accessed on the Internet at www.gossenmetrawatt.com
by entering the search term WEEE.

3 Connecting the AT3-II S

Before testing can be started, the AT3-II S must be connected to
the test instrument and to mains power. Proceed as follows:

Ð Connect the mains cable from the test instrument to the

earthing contact outlet labelled “Appliance tester” on the
AT3 -I I S.

Ð Connect the earthing contact cable from the AT3-II S to the

test/mains outlet at the test instrument. The connection at the
AT3-II S is labelled “to appliance tester”.

Prerequisite for differential current measurement

For the measurement of protective conductor current
with differential current method you require a test instru­ment which is equipped with voltage inputs.

Ð Insert the 4 mm plugs on the cable from the AT3-II S, which is

labelled “tester Bu. 2 & 3”, into sockets N (2) and L (3) at the
test instrument.

Ð Plug the CEE connector cable from the AT3-I I S into a suitable

16A/6h CEE outlet within your electrical installation. The
connection at the AT3-II S is labelled “Mains, 3~ 400 V, 16 A

50...60 Hz”. As of this point in time, the AT3-I I S and the test
instrument are supplied with electrical power.

Ð Finally, connect the device under test to the CEE outlet at the

AT3-II S. The outlet or coupling is labelled “Test-socket
appliance”.

Testing can now be started (see section 4).

4 Testing with the AT3-II S

You can now execute all tests on devices with CEE plugs which
are otherwise possible with the test instrument, and which are
supported by the AT3-I I S adapter, just as you would for devices
with earthing contact plugs. Proceed as described in the operat­ing instructions for the test instrument to this end.

The following characteristics of the AT3-I I S adapter must be
taken into consideration when performing tests with the test
instrument:

Testing Protective Conductor Resistance

When testing protective conductor resistance, measured
protective conductor resistance is increased by the amount
caused by the protective conductor system of the AT3-II S CEE
adapter itself. In case of doubt, i.e. if measurement results are
close to the permissible limit value, measure the adapter’s
protective conductor resistance at the PE terminal of its CEE
outlet, and subtract the results from the measured value obtained
for the DUT-adapter system.

Insulation Test

During insulation testing, the three phase terminals (L1, L2 and
L3) and the neutral terminal (N) at the DUT are short-circuited, and
testing is then executed.

AT3-II S

Attention!

!

Attention!

!

Attention!

!

Attention!

!

CEE Adapter 16 (20) A
for Testing Protective Conductor Current in Operating Condition

Residual Current Measurement

During 3-phase residual current measurement, the resulting
residual current is transmitted via the test cable to the
test instrument (sockets N (2) and L (3)) as a voltage value, and
recorded.

– In the case of automatic testing in accordance with standards

Ð Initialize the standard-specific setup.
Ð Select “Sequence” and deactivate the auto-test method.

During testing in accordance with standards, a menu then
appears with which either equivalent leakage current or residual
current can be selected.

Ð Select “residual current”.
The DUT is connected to line voltage via the AT3-I I S. The DUT’s

residual current is measured, and it can be tested for correct
functioning at the same time.

Function Test

Before executing the function test, or any other tests for which the

DUT is supplied with mains power and must be placed into
operation, it must be assured that there are no short-circuits in
the DUT between phase conductors L1, L2 and L3 and/or neutral
conductor N! Nonobservance may result in damage to, or
destruction of the AT3-I I S adapter, and possibly the device under
test as well!

The DUT’s power and current consumption values CANNOT be deter­mined during function testing with the AT3-II S adapter. The dis­played values indicate power consumption for the AT3-II S adapter.

Always start the test with the test instrument (orange lamp on the
AT3-II S lights up) before switching the device under test on! In the
case of extreme initial current at the DUT, nonobservance of this
start-up sequence may result in damage to, or destruction of the
AT3-II S adapter!

Disabling of Protective Devices – Max. Current Consumption

As soon as the orange lamp at the AT3-I I S lights up, the
terminals at the mains outlet from which power is supplied
are connected to the test/mains outlet or coupling at the
AT3-I I S adapter without the use of a fuse or any other
protective devices. Make sure that only devices designed
for use with 3-phase current with a maximum current
consumption of 3 x 20 A (AC-1) are connected to this outlet or
coupling.

Testing the DUT for Short-Circuits
Short-circuiting of two or all three phases of the device
under test cannot be detected by the test instrument until
after residual current testing has been executed! In such
cases, the AT3-I I S adapter may be severely damaged as
a result of current surges when this test is executed!

Before connecting a device to the AT3-I I S, make sure that there
are no short-circuits between the DUT’s phases by means of
appropriate testing, for example with a continuity tester!

Connection of the DUT in Correct Phase Sequence

In particular after repairing 3-phase devices or connecting
new CEE plugs to such devices, make sure that the
phases are connected in the correct sequence.

Test Sequence – Initial Current Problem
– Starting the test

Always start the test with the test instrument (orange lamp
on the AT3-II S lights up) before switching the device
under test on!

– Ending the test

Switch the DUT off first, and then stop testing at the test instru­ment.

In the case of extreme initial current at the DUT or
inductivity within the electrical circuit, nonobservance of
this sequence may result in damage to, or destruction of
the AT3-II S adapter!

5 Characteristic Values

Electrical Safety

Safety class
Operating voltage 300 V
Test voltage 2.2 kV
Current-carrying

capacity
Proprietary connector cable

“mains active” 7 VA, cos ϕ ∼ 0.4
Measuring category II
Contamination degree
EMC EN 61326:2000/EN 61000-2/EN61000-4

Residual Current

Measuring range 0.08 to 10.0 mA AC
Intrinsic error 4% rdg. ±40 μA
Measuring error 6% rdg. ±60 μA

Mechanical Design

Protection Housing: IP 40, connections: IP 20
Table Excerpt Regarding Significance of the IP Code

IP XY

st

(1

digit X)

Dimensions W x H x D: 290 x 120 x 105 mm

Weight 2.4 kg

Protection against foreign

2 ≥ 12.5 mm dia. 0 not protected
4 ≥ 1.0 mm dia. 0 not protected

I per IEC 61010-1/EN 61010-1/VDE 0411-1

16 A / 6 h, 3-phase, 20 A (AC-1) KB 10 min.

2

IP XY

nd

object entry

(without cables and grommets)

(2

digit Y)

Protection against the

penetration by water

Edited in Germany • Subject to change without notice • A PDF version is available on the Internet

GMC-I Messtechnik GmbH
Südwestpark 15
90449 Nürnberg •

Germany

Phone [phone]
Fax [phone]
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www.gossenmetrawatt.com