Gossen MetraWatt AT3-III E User manual

Operating Instructions
AT3-III E Safety Tester
For Testing Single and 3-Phase Consumers
and Extension Cables in Combination with
SECUTEST.../SECULIFE ST Test Instruments 3-349-155-37
9/11.11

2GMC-I Messtechnik GmbH
Device Plugs and Outlets
1 CEE outlet
3P+N+PE, 32 A, 400 V
2 CEE outlet
3P+N+PE, 16 A, 400 V
3 Earthing contact outlet
1P+N+PE, 16 A, 250 V
4 Device outlet for cable testing
1P+N+PE, 10 A, 250 V
5 CEE plug for cable testing
3P+N+PE, 32 A, 400 V
6 CEE plug for cable testing
3P+N+PE, 16 A, 400 V
7 Earthing contact plug for cable testing
1P+N+PE, 16 A, 250 V
8 Device plug for cable testing
1P+N+PE 10 A 250 V
Indicator Displays
9 Mains indicator lamps for L1, L2 and L3
10 Function LED
Self-Test
11 Test key for triggering In(In= residual current)
Connectors for
SECUTEST... (as of version 3.1) Test Instrument
12 Blue earthing contact outlet for power supply to
SECUTEST... test instruments
13 Earthing contact plug with cable, for insertion into the
test socket at SECUTEST... test instruments
14 SECUTEST port: for insertion into sockets 2 and 3 at the
SECUTEST... test instrument
15 Connector sockets for probe cable of the SECUTEST...
test instrument (for testing cables only)
AT3-III E Power Supply
16 Via connector cable with CEE plug
3P+N+PE, 16 A
SECUTEST... series test instruments are not included in
the scope of delivery.
Safety tester AT3-III E
L3
L2
L1
!
123
4
56
12 7
10
11
9
16
15 15 15
8
13
SECUTEST
14
15

GMC-I Messtechnik GmbH 3
Table of Contents
Page
1 Applications ...............................................3
2 Safety Precautions .....................................3
3 Connecting the Safety Tester to the Mains ... 4
4 Connecting a Device Under Test
to the Safety Tester ...................................5
5 Testing Devices .........................................5
5.1 Measuring Protective Conductor Resistance ...5
5.2 Measuring Insulation Resistance and
Equivalent Leakage Current ..........................5
5.3 Measuring Protective Conductor Resistance
with the Residual Current Method .................5
5.4 Testing of Differential Current
during Automatic Testing per Test Standard ..6
5.5 High-Voltage Test ........................................6
6 Testing Extension Cables ...........................6
6.1 Measuring Protective Conductor Resistance ...7
6.2 Measuring Insulation Resistance ...................7
6.3 Testing for Short-Circuits, Interruptions and
Reversed Conductors ...................................7
7 Self-Test ....................................................8
8 Technical Data ...........................................8
9 Maintenance ..............................................9
10 Repair and Replacement Parts Service,
Calibration Center and Rental Instrument
Service .......................................................9
11 Product Support .........................................9
1 Applications
The portable safety tester, which can also be
permanently mounted with the wall bracket, is
used for measuring and testing single and
3-phase electrical devices and extension cables in
combination with SECUTEST... (as of version 3.1)
test instrument.
Suitable instruments are identified in the following
pages with the following abbreviated designation:
SECUTEST....
Testing must be performed by a qualified
electrician with an appropriate test instrument
after repair or modification, and is also required for
periodic testing per DIN VDE 0105/0701-0702.
According to these regulations, testing must be
performed for protective conductor resistance,
insulation resistance, equivalent leakage current,
residual current and contact current, as well as for
the absence of voltage depending upon the type
of device under test.
The following values are tested by the safety tester in
combination with a SECUTEST... test instrument:
• Protective conductor resistance
• Insulation resistance
• Dielectric strength (HV test) *
• Earth leakage current
• Residual current
• Contact current
• Protective conductor current (AC and DC are
tested separately) *
• For extension cables:
– Short-circuit
– Conductor continuity
And for 3-phase extension cables:
– Phase reversal at L1, L2 and L3
for substantiation of clockwise rotation
* Only if the utilized SECUTEST... is capable of performing this
measurement
Measurement results are displayed at the
SECUTEST... test instrument.
Note!
The AT3-III E safety tester is equipped with
electronic error monitoring which disconnects the
device under test from the mains in the event of
fault currents of greater than 18 mA.
2 Safety Precautions
The safety tester has been manufactured and
tested in accordance with the following
regulations:
IEC 61010-1/DIN EN 61010-1/VDE 0411-1
“Regulations for electronic testers and controllers,
part 1: Safety measures for electrical measuring
instruments”
DIN VDE 0404 “Devices for technical safety
testing of electrical equipment, parts 1 and 2.”
EN 61326-1 product standard EMC requirements.
Safety is only assured for the user and the safety
tester when used for its intended purpose in
combination with SECUTEST... test instruments.
In order to maintain flawless technical safety
conditions, and to assure safe use, it is imperative
that you read these operating instructions
thoroughly and carefully before placing your safety
tester into service, and that you follow all
instructions contained herein.

4GMC-I Messtechnik GmbH
Due to the fact that all tests performed with the AT3-
III E must be executed in combination with a
SECUTEST... test instrument, you must also read the
safety precautions and liability limitations included in
the operating instructions for this instrument.
Observe the following safety precautions:
Attention!
!
If the red LED (10) remains lit even after
the AT3-III E has been disconnected from
the mains and connected once again, the
safety tester is defective.
If this is the case,
the AT3-III E must be removed from service
and repaired before it is used again.
• In order to assure compliance with technical
safety requirements, the AT3-III E safety
tester should only be repaired by the
manufacturer.
• The AT3-III E must be disconnected from the
mains and from the SECUTEST... test
instrument before it is opened.
Measurements within electrical systems are prohibited!
• The safety tester’s 16 A CEE 3P+N+PE (16)
plug may only be connected to 230/400 V
50 Hz mains power. In order to avoid
undesired shutdown of defective devices
under test, the electrical circuit for the device
under test should be separately fused.
• Before connecting the AT3-III E to the mains,
the SECUTEST... test instrument must first be
connected to the AT3-III E.
Attention!
!
Tests during which mains power is
applied may only be selected with the
function selector switch at the
SECUTEST... test instrument after safety
class I devices under test have passed
the protective conductor test.
If the protective conductor is defective
(interruptions / reversed conductors), line
voltage may be present at the housing of
a defective device under test, at the
earthing contacts of the test plugs (4 – 7)
and at the safety socket (15)!
•ForREASONS OF SAFETY, the device under test
must be turned off before switching to
“MAINS” so that dangerous devices under
test (e.g. a circular saw) can only be switched
on intentionally.
• Be prepared for the occurrence of
unexpected voltages at devices under test
(e.g. due to charged capacitors).
• Before connecting the device under test to
the safety tester, subject it to a thorough
VISUAL INSPECTION first. Damaged devices
under test must be repaired prior to testing.
• Only extension cables which have been
plugged into the test outlets (1 – 4) at the
safety tester may be connected to the device
plugs (4 – 7) at the safety tester.
• Due to safety tester design in accordance
with DIN VDE 0404, the “PE” contacts at the
outlets (1 – 4) are only connected to the mains
protective conductor when the SECUTEST...
test instrument has been set for testing with
mains power.
• If the safety tester and/or its connector cables
demonstrate visible damage, no longer
function, have been stored for a lengthy
period of time under unfavorable conditions or
have been subject to excessive stress during
transport, it must be assumed that hazard-
free operation is no longer possible. Remove
the AT3-III E from service and secure it
against inadvertent use in such cases.
Meanings of Symbols on the Instrument
Warning concerning a point of danger
(Attention: observe documentation!)
Indicates EC conformity
This 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 Safety Tester to the Mains
The following connections must first be
established before connecting the safety tester to
the mains:
a) Insert the mains plug from the SECUTEST... into
the earthing contact outlet (12) at the AT3-III E.
b) Insert the earthing contact plug (13) from the
AT3-III E into the test socket at the
SECUTEST....
c) In order to measure protective conductor
current, connect the SECUTEST port (14) of
the AT3-III E into sockets 2 and 3 at the
SECUTEST....
d) In order to test extension cables, insert the test
probe at the end of the SECUTEST... probe cable
into the socket (15) at the AT3-III E.
Connect the safety tester to 230/400 V mains
power. The safety tester now performs a self-test.
If the tester is intact, the red LED lights up briefly.
!

GMC-I Messtechnik GmbH 5
4 Connecting a Device Under Test
to the Safety Tester
After the device under test has passed a visual
inspection and before connecting it to the
appropriate plug or socket at the safety tester, as
well as before each new test, the SECUTEST...
test instrument must be returned to its initial
setting depending upon the type of test.
Connect the device under test to the safety tester
and switch all of its functions on, making sure
that, for example, thermostat contacts are closed
etc. Always measure protective conductor
resistance first for safety class I devices, because
if the protective conductor is defective, insulation
resistance, equivalent leakage current and
protective conductor current cannot be
measured, and high-voltage testing cannot be
performed.
5 Testing Devices
Perform testing in accordance with the operating
instructions included with the SECUTEST... test
instrument!
Observe the following instructions when using the
SECUTEST... in combination with the AT3-III E
during automatic test sequence :
5.1 Measuring Protective Conductor Resistance
The clip or the test probe at the end of the probe
cable from the SECUTEST... test instrument must
be connected to the housing of the device under
test such that good contact is assured.
Note!
Connector cable (13) resistance is 0.07 . In
order to compensate for this error, proceed
as described in the operating instructions
included with the
SECUTEST... test instrument under
Individual Measurements Protective
Conductor Resistance Zero Balancing.
If the AT3-III E is out of use for a prolonged period
of time, the earthing contact faces of the plug-
and-socket connectors and the connecting plug
(13) may corrode, thus leading to slightly elevated
resistance measurement values. In this case, plug
and unplug the connections several times until the
expected values are reached again.
5.2 Measuring Insulation Resistance and Equivalent
Leakage Current
L1, L2, L3 and N (short-circuited) are measured
against PE during insulation testing.
5.3 Measuring Protective Conductor Resistance with
the Residual Current Method
The DUT is placed into operation during residual
current measurement. The L1, L2 and L3 mains
lamps light up at the AT3-III E during this test.
This measurement may not be performed on
safety class I devices until after the protective
conductor test has been passed in accordance
with chapter 5.1.
ÐTurn off the device under test.
ÐSelect the IL-DI measurement setting at the
SECUTEST....
ÐThe line contactor switches mains power to
the test outlets (1 – 4) at the AT3-III E. Signal
lamps L1, L2 and L3 indicate the presence of
line voltage.
ÐNow switch on the DUT
(as described in chapter 2).
Contact current is measured by means of residual
current measurement for safety class II devices,
and safety class I devices with accessible
conductive parts which are not connected to the
protective conductor. Contact all accessible
conductive parts at the device under test with the
test probe at the end of the probe cable form the
SECUTEST... to this end.
These measurements must be performed with the
plug in both positions for DUTs with earthing
contact plugs!
Note!
This test must be performed in accordance
with the specified test sequence.
Mains power
must be indicated by signal lamps L1, L2 and L3 (9)
before switching the device under test on.
The test outlets (1 – 4) are disconnected
from the mains by the safety shutdown
function included with the AT3-III E for
devices under test with fault currents of
greater than 18 mA during measurement of
protective conductor current with residual
current. Mains power may be disconnected
if the AT3-III E is used in systems protected
with RCCBs rated less than 30 mA. Mains
signal lamps L1, L2 and L3 (9) go out. The
function LED (10) blinks.
Disconnect the AT3-III E from the mains to reset.
Reconnect the AT3-III E to the mains. The safety
tester is once again ready for use after a brief
self-test.
The short-circuit test displayed at the
SECUTEST... cannot be performed due to safety
impedances which have been integrated into the
AT3-III E for testing 3-phase devices.

6GMC-I Messtechnik GmbH
Figure 1 Connecting Single and 3-Phase Devices to the AT3-III E and the SECUTEST...
5.4 Testing of Differential Current
during Automatic Testing per Test Standard
SECUTEST SII / SIII / SECULIFE ST:
ÐInitiate the standard-specific setup.
ÐSelect „Sequence“ and deactivate the auto-
matic test method.
During testing according to standard, a menu
appears which proposes two options, i.e. equiva-
lent leakage current and differential current.
ÐSelect „Differential current“.
SECUTEST S2N+ / S2N+10 / S2N+W:
ÐSelect switch position „active“ here.
Line voltage is applied to the DUT via the AT3-III E
tester. The differential current of the DUT is mea-
sured while allowing for a function test of the DUT.
5.5 High-Voltage Test
Caution: High-Voltage!
Prior to performing the test remove the
probe including probe tip from sockets 4
and 5 of the SECUTEST.... Do not touch
the DUT, the device plug and the earthing
contact cable of the AT3-III E during the
voltage test.
Do not unplug the AT3-III E connector
cable (13) from the test socket at the
SECUTEST...: the device under test may
still be charged, and high voltage may be
present at the earthing contact plug.
During this test, L1, L2, L3 and N (short-circuited)
are measured against PE with the preset high
voltage (max. 1.5 kV!).
Please observe all additional safety precautions
on performing the test as well as the note on the
exclusion of liability in the operating instructions of
the SECUTEST... test instrument.
6 Testing Extension Cables
The SECUTEST port (14) may remain connected
to sockets 2 and 3 at the SECUTEST... during this
test. Perform testing in accordance with the
operating instructions included with the
SECUTEST... test instrument!
Observe the following instructions when using the
SECUTEST... in combination with the AT3-III E:
The test probe at the end of the probe cable of the
SECUTEST... must first be connected to the respective
socket (15) (probe 1 to 4) of the associated plug at the
AT3-III E. In order to test, only connect the plug and
socket at the ends of the respective extension cable to
be tested to the associated device plug and socket at
the AT3-III E.
SECUTEST SII / SIII / SECULIFE ST:
Select the following test sequence from the initial
window at the SECUTEST... test instrument:
Extension cable: “X” WITH EL1
Note!
Testing cables by means of the AT3-III E is
only possible with this setting.
230/400 V 50 Hz
Safety tester AT3-III E
L3
L2
L1
!
SECUTEST
13

GMC-I Messtechnik GmbH 7
SECUTEST S2N+ / S2N+10 / S2N+W:
ÐSelect the following switch position:
VDE 0701-0702
6.1 Measuring Protective Conductor Resistance
Testing is performed according to the instructions
included in chapter 5.1.
6.2 Measuring Insulation Resistance
L1, L2, L3 and N (short-circuited) are measured
against PE during insulation testing. Due to good
cable insulation, a value of 2 Mshould not be
significantly exceeded.
6.3 Testing for Short-Circuits, Interruptions and
Reversed Conductors
Testing of single-phase cables is performed as
described in the instructions included with the
SECUTEST... under (optional EL1 adapter).
The EL1 adapter accessory is included in the
AT3-III E as a subassembly.
Note:
When testing device cable connections (socket 4/
plug 4) polarity L/N is not being checked.
Testing of 3-phase cables is the same, except that it
also includes an additional test for reversing of
conductors L1, L2, L3 and N.
3-phase cables have only passed testing for
short-circuits, interruptions and reversed
conductors (clockwise rotation) if the following test
result appears: “Cable OK”.
Messages such as “interruption / short-circuit”
always indicate that the cable is defective. If this is
the case, conductors L1, L2, L3 and N may also
be reversed. The actual defect must be
determined.
Figure 2 Connecting Single Phase Extension Cables to the AT3-III E with the SECUTEST...
Figure 3 Connecting 3-Phase (or Single Phase) Extension Cables to the AT3-III E with the SECUTEST...
SECUTEST
34
4
4
3
230 V 50 Hz
SECUTEST
1
2
21
230/400 V 50 Hz

8GMC-I Messtechnik GmbH
7Self-Test
Because it is so easy to perform, the self-test should
be conducted before each use of the AT3-III E.
Please be careful to ensure that the case of the
AT3-III E is not being contacted with devices
under PE or earth potential during the self-test.
Performing the Protective Conductor Test
Ð
Insert the mains plug from the SECUTEST... into
the earthing contact outlet (12) at the AT3-III E.
ÐThe earthing contact plug (13) and the SE-
CUTEST port (14) of the AT3-III E may not be
plugged into the SECUTEST....
ÐConnect the AT3-III E to mains power.
ÐSet the SECUTEST... to the protective con-
ductor test individual measurement (RSL/RPE).
ÐContact protective conductor potential at the
mains system which is supplying power to the
AT3-III E with the test probe at the end of the
probe cable from the SECUTEST..., e.g. at the
earthing contact of an earthing contact outlet.
If an excessively high value or interruption is
indicated, the protective conductor is inter-
rupted.
The AT3-III E safety tester must be disconnected
from the mains, and the error in the electrical
system or the safety tester must be corrected.
The AT3-III E is equipped with a “Trigger In” test
key in order to allow for testing the included In
safety shutdown function at any time.
Performing the InSelf-Test
ÐRemove the device under test
(device or extension cable).
ÐSet the SECUTEST... to individual measure-
ment.
ÐSECUTEST... (as of version 3.1): Select the
“DI current” sub-menu (residual current).
ÐSignal lamps L1, L2 and L3 indicate the pres-
ence of line voltage.
ÐActivate the “Trigger In” key (11).
ÐThe AT3-III E disconnects mains power from
the outlets (1 – 4).
ÐSignal lamps L1, L2 and L3 go out.
ÐThe function LED (10) blinks.
Disconnect the AT3-III E from the mains to re-
set. Reconnect the AT3-III E to the mains.
The safety tester is once again ready for use
after a brief self-test.
Note!
If mains power is not switched during this
test, the fuses in the AT3-III E may have
blown. If the AT3-III E still does not function
correctly after replacing the fuses, it must be
removed from service and repaired.
Measurement is no longer possible!
8 Technical Data
Equivalent Leakage Current Measuring Function
Measuring Range 0.00 ... 21.00 mA
Intrinsic Uncertainty
 (5% of rdg. + 5 d) > 10 d
Measuring Range 20.1 … 120.0 mA
Intrinsic Uncertainty
 (15% of rdg. + 5 d) > 10 d
Residual Current Measuring Function
Measuring Range 0 20 mA
Transformation Ratio 1 V per 10 mA
Intrinsic Uncertainty (5%
of rdg. + 0.05 mA)
Nominal Ranges of Use
Line Voltage
L1/L2/L3/N 207 253 V AC
Frequency 49 51 Hz
Temperature 0 °C +40 °C
Line Voltage
Waveshape sinusoidal
Reference Conditions
Ambient Temperature +23 C 2K
Relative Humidity 50% 5%
Line Voltage 230 V/400 V 10%
Frequency
of Measured Quantity 50 Hz 0.2%
Ambient Conditions
Operating Temperatures –10 + 40 C
Storage Temperatures –25 + 60 C
Humidity max. 75%, no
condensation allowed
Elevation up to 2000 m
Power Supply
Nominal Line Voltage
3~230/400 V/50 Hz/CAT II
Connection only permissible with overload
protection device In= 16 A I21.45 In
Electrical Safety
Standard
DIN VDE 0404-1/-2:2002-5
IEC/EN 61010-1:2001
Contamination degree 2
Safety Class I
Residual Current
Shutdown (4-pole) at approx. 18 mA
Device Fuses F0315 L250V
5 x 20 T32mA L 250 V
DIN EN 60127-2

GMC-I Messtechnik GmbH 9
Mechanical Design
Protection case: IP40
terminals: IP20
Extract from table on the meaning of IP codes
Dimensions 405 x 300 x 220 (mm)
with lid
Weight approx. 6.7 kg
Electromagnetic Compatibility
Intrinsic Uncertainty EN 61326-1:2006
class B
Intrinsic Uncertainty EN 61326:2006
9 Maintenance
Front Panel / Housing
No special maintenance is required for the
housing. Keep outside surfaces clean. Use only a
cloth for cleaning, which has been slightly
dampened with water. Avoid the use of cleansers,
abrasives and solvents.
Note!
According to DIN VDE 0701-0702,
measuring instruments used for periodic
testing must be tested and calibrated in
accordance with the manufacturer’s
specifications on a regular basis. Depending
upon usage, the manufacturer recommends
an interval of 1 to 3 years for this test
instrument.
Device Return and Environmentally Compatible Disposal
The instrument is a category 9 product
(monitoring and control instrument) in accordance
with ElektroG (German Electrical and Electronic
Device Law). This device is not subject to the
RoHS directive.
We identify our electrical and electronic
devices (as of August 2005) in
accordance with WEEE 2002/96/EG and
ElektroG with the symbol shown to the right per
DIN EN 50419.
These devices may not be disposed with the
trash. Please contact our service department
regarding the return of old devices.
10 Repair and Replacement Parts Service,
Calibration Center and Rental Instrument Service
If required please contact:
GMC-I Service GmbH
Service-Center
Thomas-Mann-Str. 20
90471 Nürnberg • Germany
Phone: [phone]
Fax: [phone]
E-Mail [email protected]
www.gmci-service.com
This address is only valid in Germany.
Please contact our representatives or subsidiaries
for service in other countries.
11 Product Support
If required please contact:
GMC-I Messtechnik GmbH
Product Support Hotline
Phone: [phone]
Fax: [phone]
E-Mail [e-mail]
IP XY
(1st digit
X)
Protection against
foreign object en-
try
IP XY
(2nd digit
Y)
Protection against
the penetration of
water
0 not protected 0 not protected
150.0 mm dia. 1 vertically falling
drops
212.5 mm dia. 2
vertically falling
drops with enclo-
sure tilted 15
32.5 mm dia. 3 spraying water
41.0 mm dia. 4 splashing water

Printed 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]
E-Mail [email protected]
www.gossenmetrawatt.com