Operating Instructions
Figure shows device
with optional SI module
optional test adapter SECULOAD
SECUTEST S 2 N+w
Test Instrument with Automatic Test Sequences for IEC 60974-4 and Draft IEC 62638
3-349-630-03
8/4.18
2 GMC-I Messtechnik GmbH
PROBE
RS232
54
45678910
11
12
13
14 15
PROBE
19
20
18
17
23
18
22
21
16
These operating instructions describe an
instrument with firmware version 9.1
Connection of Standard Probe 1
Insert the probe’s double plug into sockets 4 and 5
such that the plug with the white ring makes contact
with socket 5 (vertical bar).
Connection of Probe 2 (for Test per IEC 60974-4/VDE 0544-4)
Insert the probe’s double plug into sockets 2 and 3
after being prompted to do so.
Note
Contact problems with exposed conductive parts when
using the standard probe with test tip
In order to assure good contact, surface coatings
must be removed from devices under test with special
tools at a suitable location.
The tip of the test probe is not suitable for scratching
away paint, because this may impair its coating and/
or mechanical strength. The Z745G brush probe may
be more suitable than the test prob e in certain indi-
vidual cases.
Scope of delivery:
1 SECUTEST S2 N +w test instrument
2 Probe cables with test probe
1 Plug-on alligator clip for test probes
3 Plug-on quick clips
1 Calibration certificate per DAkkS
1 Set operating instructions
1Carrying strap
Up-to-date PC software (free starter program or
demo software for data management, as well as re-
port and list generation) can be downloaded from our
website.
SECUTEST S2 N +w
• Protective conductor resistance measurement:
Test current of 200 mA DC or 10 A AC
IOIOI
Max. 10 V
Max. 250 V
PE
N
L
1
2
3
!
Page 8
GMC-I Messtechnik GmbH 3
Upper Left Figure
1 Jack for protective conductor at
device under test
2 Jack for neutral conductor at devic
e under test (test per VDE 0544-4:2009-06:
connect to measurement output at the SECULOAD*
adapter)
Jack for connecting probe 2
3 Jack for phase conductor at device under t
est (test per VDE 0544-4:2009-06:
connect to measurement output at the SECULOAD*
adapter)
Jack for connecting probe 2
4 Jack for connecting probe 1
5 Jack for connecting probe 1
6 F
unction Selector Switch
– VDE-: Automated test sequence per selected standard
– Off: Instrument is switched off (no disconnection from mains)
– Menu: Setup : Configure device parameters (see section 8)
R
PE
: Individual measurements (see section 9)
– Function test: Function test (see section 10)
7 key for selecting menus and parameters
8 key for selecting menus and parameters
9 LCD panel
10 Socket connector for RS232 inter
face – for SI module SECUTEST SI+
,
SECUSTORE
memory adapter, barcode scanner or RFID reader)
11 Signal lamp for mains connection error
12 key for entry, for starting test sequences and for finger contact
i
13 help key (context sensitive)
14 Key next to the
symbol for switching test voltage to
the test socket (only possible if symbol LED is blinking)
15 Signal lamp for the function test
Lower Left Figure
16 Push-buttons (left and right) for releasing t
he handle from its snap-in position
17 Standard outlet socket (test socket) for conn
ecting the device under test
(see section 7)
18 Push-buttons (left and right) for r
eleasing the lid
19 Compartment for probe and accessories
20 Lid
21 Probe with test tip (accessory probe wit
h SK2W coil cable (Z745N))
22 Carrying handle and tilt stand
23 Cover or SI module (accessory: SE
CUTEST PSI or SECUTEST SI+)
* Accessory, Z745V (not included in scope of delivery)
Overview of Available Probe Types
Probe Type
Article No.
Applications Special Features
Standard probe 1(cable with
test probe and alligator clip)
— Test current: max. 25 A Probe with straight cable
Probe 2 (cable with test probe) — Test current: max. 25 A Probe with straight cable
SK2 (accessory) Z745D Test current: max. 25 A Probe with straight cable,
2 m long
SK2W (accessory) Z745N Test current: max. 25 A
Test probe with coil cable,
2 m long
Option SK5 (accessory) Z745K Testing of several pro-
tective conductor con-
nections
Special probe in combination with
“automatic recognition of mea-
suring point change” function
(see page 13).
Brush probe (accessory)
Can be plugged onto all above
l
isted probes and test probes
Z745G Leakage current, pro-
tective conductor resis-
tance
For contacting devices under
te
st with rotating, vibrating,
exposed conductive parts
Note
Use of probes other than those specified above:
Cables plugged into jacks 4 and 5 must be
short-circuited in
order to perform the probe test, either by plugging the cable
ends together or by means of a conductive surface at the device
under test (4-wire measurement).
Remove any corrosion from the device under test.
!
Data Backup
Measurement data, report data and user entries are stored to RAM at the
SI module
(accessory), as long as the respective battery supplies the re-
quired amount of voltage.
Save your data to a PC on a regular basis in order to prevent any loss of
data a
t the SI module.
We assume no responsibility for any data loss.
Up-to-date PC software (free starter program or demo software for data
management,
as well as report and list generation) can be downloaded
from our website.
Contents Page Contents Page
4 GMC-I Messtechnik GmbH
1 Applications ...................................................................................6
1.1 Table: Types of DUTs – Tests – Regulations ...................................................6
1.2 Table: Individual Measurements and Regulations ............................................6
1.3 Table: Leakage Current Types .......................................................................7
2 Safety Features and Precautions ...................................................7
3 Initial Start-Up ................................................................................8
3.1 Connection to the Mains (230 V, 50 Hz) ..........................................................8
3.2 Automatic Recognition of Mains Connection Errors ..........................................9
4 General Notes ..............................................................................10
4.1 Prompting ...................................................................................................10
4.1.1 Changing the User Interface Language .........................................................10
4.1.2 Automatic Protection Class Selection ............................................................10
4.1.3 Manual or Automatic Operating Sequences ...................................................10
4.2 Help Function ..............................................................................................10
4.3 Adjusting Contrast .......................................................................................11
4.4 Configuring Device Parameters, Setting Date and Time ..................................11
4.5 Configuring Measurement and Sequence Parameters ....................................11
4.6 Setting Standard-Specific Limit Values (not in IEC 60974-4) ..........................11
4.7 Saving Settings ...........................................................................................11
5 Classification of Devices Under Test ............................................12
5.1 Protection Classes ......................................................................................12
6 Abbreviations ...............................................................................12
7 Connecting the Device Under Test ...............................................13
8 Configuring Device Parameters ...................................................15
9 Individual Measurements ............................................................16
9.1 Measuring Protective Conductor Resistance ................................................. 16
9.2 Insulation Resistance R
INS
. .......................................................................... 17
9.3 Measuring Leakage Current ......................................................................... 19
9.3.1 Touch Current I
T
(welding circuit leakage current) ......................................... 19
9.3.2 Protective Conductor Current (primary leakage current), Differential Current Me-
thod (I
DI
) ..................................................................................................... 19
9.4 Equivalent Leakage Current ......................................................................... 20
9.5 Probe Voltage U
probe
– Max. 300 V .............................................................. 22
9.6 Alternating / Direct Voltage U
AC/DC
– Max. 253 V (open circuit voltage U
0
) ...... 22
9.7 Resistance R .............................................................................................. 23
9.8 Measurements with Accessories .................................................................. 23
9.8.1 Alternating Current I
Z
with Current Clamp ..................................................... 23
9.9 Protective Conductor Resistance R
PE
via Current Clamp ................................ 24
9.9.1 Temperature T with Pt100/1000 Sensor ...................................................... 24
10 Function Test ...............................................................................26
11 Measurements – Switch Position: Standard (VDE ...) ..................28
11.1 Test Sequences .......................................................................................... 28
11.2 Setting Up Test Sequences .......................................................................... 29
11.3 Configuring Measuring Parameters .............................................................. 29
11.4 Testing Extension Cables in Accordance with Draft IEC 62638 / VDE 0701-0702 ......... 30
11.5 Testing Devices per Draft IEC 62638 / VDE 0701-0702 – Passive ................ 32
11.6 Testing Devices per Draft IEC 62638 / VDE 0701-0702 – Active .................. 34
11.6.1 Testing of Battery Charging Units ................................................................ 36
11.7 Testing Devices per Draft IEC 62638 / VDE 0701-0702 – ICT ...................... 38
11.8 Testing Welding Equipment per IEC 60974-4 ............................................... 40
12 Saving Data to the SI Module (accessory)
and Database Operations ............................................................42
12.1 Saving Measurement Data to the SI Module (accessory) ................................ 42
12.2 Storing Test Results to the SECUTEST S2 N +w ............................................ 42
GMC-I Messtechnik GmbH 5
Contents Page
13 Storing Test Results to the Test Instrument and Printing them in Re-
port Form ..................................................................................... 43
14 Characteristic Values .................................................................. 44
15 RS232 Interface ........................................................................... 47
15.1 Transmission of Measurement Results to the SI Module .................................47
15.2 PC Connection ............................................................................................47
15.2.1 Software Evaluation of Measurement Results ................................................47
15.2.2 Instrument Control via Interface Commands ..................................................47
15.3 Interface Configuration and Protocol .............................................................47
16 Appendix ...................................................................................... 48
16.1 Evaluation of Measured Values for Individual Measurements
as well as for Calculated Quantities ..............................................................48
16.2 Evaluation of Measured Values for Leakage Current Measurements
(Automatic Test Sequence in Accordance with the Standard) ..........................48
16.3 Index ..........................................................................................................49
17 Maintenance – Recalibration ....................................................... 50
17.1 Housing Maintenance ..................................................................................50
17.2 Recalibration ...............................................................................................50
17.3 Safety Inspections .......................................................................................51
17.4 Return and Environmentally Sound Disposal ..................................................51
18 Repair and Replacement Parts Service
Calibration Center and Rental Instrument Service ...................... 52
19 Product Support .......................................................................... 52
6 GMC-I Messtechnik GmbH
1 Applications
1.1 Table: Types of DUTs – Tests – Regulations
Testing after Repairs /
Periodic Testing
DUTs
to be tested in accordance
with the following regulations
Draft IEC 62638 / VDE 0701-0702
IEC 60974-4 / VDE 0544-4
Electrical equipment for measurement,
control and laboratory use
Voltage generating devices
Electrical tools
Electrical heaters
Devices with electric motors
Light fixtures
Consumer electronics, IT equipment and
communications electronics
Cable reels, extension cables and
device connector cables
Data processing equipment and
office machines
Arc welding equipment
Attention!
!
The test instrument may not be used for measurements
within electrical systems!
1.2 Table: Individual Measurements and Regulations
Individual
Measurements
per Regulation
Test Current [A]
Draft IEC 62638 /
VDE 0701-0702
IEC 60974-4 / VDE 0544-4
Protective conduc-
tor resistance
0.2
Insulation
resistance
Equivalent
leakage current
Equivalent
(device) leakage
current
Differential
current
Protective
conductor current
Primary leakage
current
Touch current
Absence of voltage
(e
xposed conduc-
tive parts)
Patient leakage
current
Device leakage
current
Welding circuit
leakage current
Key
Specified test
GMC-I Messtechnik GmbH 7
1.3 Table: Leakage Current Types
Draft IEC 62638 /
VDE 0701-0702
IEC 60974-4 /
VDE 0544-4
The following is
measured:
Equivalent leakage current PROBE (connected to protective
conductor) to L & N
Touch current / current mea-
surement for absence of voltage
Welding circuit leakage current
Probe to PE
Protective conductor to PE
Primary leakage current during
operation, direct measurement
Protective conductor
interrupted, probe to PE
Protective conductor current
wi
th differential current method
Primary leakage current during
operation, differential current
method
See section 9.3.2
Key
NC = Normal conditions
PE = Potential earthing
, mains protective conductor
DPE = Protective conductor of the device under test
2 Safety Features and Precautions
This instrument fulfills the requirements of the applicable EU guidelines
and national regulations. We confirm this with the CE mark. The relevant
declaration of conformity can be obtained from GMC-I Messtechnik
Gmb
H.
The SECUTEST S2 N +w test instrument has been manufactur
ed and tested
in accordance with the following safety regulations:
IEC 61 010-1 / DIN EN 61010-1 / VDE 0411-1, DIN VDE 0404,
DIN VDE 0413, parts 2 and 4
The safety of the user, the test instrume
nt and the device under test (elec-
trical equipment) is only assur
ed when the instrument is used for its in-
tended purpose.
Read the operating instructions carefully and completely
before placing your test
instrument into service. Follow all instructions contained therein. Make sure that
the operating instructions are available to all users of the instrument.
Tests may only be performed by a qualified electrician, or under the s
upervision
and direction of a qualified electrician. The user must be instructed by a qualified
electrician concerning performance and evaluation of the test.
Observe the following safety precautions:
• The instrument may only be connect
ed to a 230 V/240 V mains sys-
tem that complies with the
applicable safety regulations (e.g. IEC
60346, VDE 0100) and is protected with a fuse or circuit breaker with a
maximum rating of 16 A.
• Measurements within electrical syst
ems are prohibited.
• Be prepared for the occurrence of une
xpected voltages at devices
under test (for example, capacitors may be dangerously charged).
• Make certain that the measurement cables a
re in flawless condition,
e.g. no damage to insulation, no cracks in cables or plugs etc.
• If a probe with coil cable (SK2W) is used:
Grip the test probe firmly, for exampl
e during insertion into a jack
socket. Tensioning at the coil cord may otherwise cause the test probe
to snap back resulting in possible injury.
• Meas
urement of Insulation Resistance and Equivalent Leakage Current:
Testing is conducted with up to 500 V
. Current limiting is utilized
(I < 3.5 mA), but if the terminals (3 or 2) ar
e touched, electrical shock
may occur which could result in consequential accidents.
If the DUT is connected via jacks 1 thr
ough 3, special care must be
taken to avoid contact with open cables.
• L
eakage Current Measurement:
It is absolutely essential t
o assure that the device under test is oper-
ated with line voltage during performa
nce of the leakage current mea-
surement. Exposed conductive p
arts may conduct dangerous contact
voltage during testing, and may not under any circumstances be
touched
(mains power is disconnected if leakage current exceeds approx.
10 mA).
Attention!
!
The function test may only be performed after the DUT has suc-
cessfully passed the safety test!
8 GMC-I Messtechnik GmbH
Switching Loads
Be sure to adhere to the sequence sp
ecified below when switching DUTs
which are subjected to a load. Excessive wear of the mains relay in the
test instrument is avoided in this way.
Start the measurement:
1) DUT: T
urn the DUT off with its own switch.
2) SECUTEST S2 N +w: Switch line voltage t
o the test socket .
3) DUT: T
urn the DUT on with its own switch.
End the measurement:
4) DUT: T
urn the DUT off with its own switch.
5) SECUTEST S2 N +w:
Disconnect line voltage from the test socket .
Measurement at Jacks 1 – 2 – 3
First start the respective measurement and c
ontact the measuring point.
No more than 10 V nay be applied between jacks 1 and 2.
Up to 250 V nay be applied between jacks 2 and 3.
!
Attention: Jacks 2 and 3 are short-circuited during all measure-
ments conducted at the test socket (exception: see section 9.6)!
The measuring and test instrument may not be placed into s
ervice:
• If external damage is apparent
• With damaged connector cables, measuring cables or patient ports
• If the instrument no longer functions flawlessly
• After extraordinary stresses due to transport
In such cases, the instrument must be r
emoved from operation and se-
cured against unintentional use.
Opening of Equipment / Repair
The equipment may be opened only by authoriz
ed service personnel to
ensure the safe and correct operation of the equipment and to keep the
warranty valid.
Even original spare parts may be installed
only by authorized service per-
sonnel.
In case the equipment was opened by una
uthorized personnel, no war-
ranty regarding personal safety, measur
ement accuracy, conformity with
applicable safety measures or any consequential damage is granted by
the manufacturer.
Meaning of Symbols on the Instrument
The symbols on the instrume
nt have the following meanings:
Warning regarding dangerous electrical voltage
!
Warning concerning a point of danger
(attention: observe documentation!)
Test socket
This device may not be disposed of with the trash.
Further information regarding the WEEE mark can be
acces
sed on the Internet at www.gossenmetrawatt.com by
entering the search term “WEEE”.
3 Initial Start-Up
3.1 Connection to the Mains (230 V, 50 Hz)
➭ Connect
the mains plug at the test instrument to the mains power outlet. The function
selector switch can be set to any position.
If a mains outlet (earthing contact outlet) i
s not available, or if only a
3-phase outlet is available, the adapter sock
et can be used to connect the phase con-
ductor, the neutral conductor and the protec
tive conductor. The adapter socket has
three permanently attached cables and is included with the KS13 cable set.
Attention!
!
If connection is not possible via an earthing contact outlet: Shut
down mains power first. Then connect the cables from the cou
-
pling socket to the mains using pick-
off clips in accordance with
the diagram. Disconnection of the test instrument from mains
power is only possible with the mains plug.
L1
N
green-yellow
green-yellow
PE
L1
L2
L3
N
PE
L1
L2
L3
N
green-yellow
U
L–N
= 230 V
Mains Connection
GMC-I Messtechnik GmbH 9
3.2 Automatic Recognition of Mains Connection Errors
The device automatically recognizes mains connec
tion errors if the condi-
tions in the following table have been fulfilled. The user is informed of the
ty
pe of error, and all measuring functions are disabled in the event of dan-
ger.
Type of Mains
Connection Error
Message Condition Measurement
Phase conductor L at
pr
otective conductor PE
to finger contact
(
key)
Text at LCD panel
Press
key
U 100 V
Disabled
Protective conductor PE
and ph
ase
conductor L
reversed and/or
neutral conductor N
interrupted
!
lamp lights up
Voltage at PE
> 65 V
Impossible
(no
supply power)
Contact voltage at
pr
otective conductor PE
to neutral conductor N
Text at LCD panel U 50 V
Disabled,
although disabling
can be deactivated
1
Line voltage
too low
!
lamp lights up
U
L-N
< 180 V
Possible under cer-
tain circumstances
1
Switch position: Setup – menu: Test Sequence – parameter: IT system
Attention!
!
If you discover during the protective conductor potential test
that the mains protective conductor is charged with voltage (in accor
-
dance with the two cases ment
ioned first), you may no longer per-
form any measurements with your test instrument. V
oltage is actually
present at the exposed earthing contacts of the standard
socket (17) and may be dangerous to you. Disconnect the test
instrument from the mains immediately and see to it that the de-
fect at the mains connection is repaired.
Note
Voltage at the electrical system’s protective conductor PE may result
in distorted measurement values during testing for the absence
of voltage, or during leakage voltage measurements.
10 GMC-I Messtechnik GmbH
4 General Notes
4.1 Prompting
Integrated online instructions inform the user regarding all required con-
nections, necessary work steps, operator errors, measurement results
and more in all measuring modes.
Information and test results appear at the dot matrix LCD in plain text.
4.1.1 Changing the User Interface Language
If you would like to change the user interface language, the desired lan-
guage can be uploaded to the test instrument with the help of the SECU-
Up update and enabling program. The software can be downloaded from
the Internet at: www.gossenmetrawatt.com (Products > Software for Tes
-
ters > SECU-Up).
After installing the program and starting it at your PC, select the “Update”
menu and then the desired language: Deutsch, English, Français, Italiano,
Only one language can be loaded to the test instrument at any given time,
and the previous language is overwritten.
Attention!
!
Under no circumstances may the test instrument or the PC be
disconnected from supply power during data transmission.
No other programs may be running in Windows during the up-
date!
4.1.2 Automatic Protection Class Selection
Depending upon the type of mains plug or the connection configuration
for the device under test, the test instrument recognizes the respective
protection class and recommends its use for the measurement to be per
-
formed.
4.1.3 Manual or Automatic Operating Sequences
Depending upon selections made in the setup menu (switch position:
VDE..., menu: setup..., menu: Sequence... , parameter: “Manual Sequence”),
the next measurement is started automatically after the current measure
-
ment has been completed, or can only be started after manual acknowl-
edgment.
The integrated online instructions are adequate for most tests and mea-
surements. However, the contents of these operating instructions should
nevertheless be read and observed.
4.2 Help Function
Online help can be queried and displayed at the LCD for all measuring
and test functions, and for almost all settings. Schematic diagrams which
illustrate proper connection of devices under test to the test instrument
can be displayed as well.
➭ Press the following key in order to query online help:
➭ Press the same key again in order to exit online help.
Note
Online help can be queried during measurement by pressing
and holding the help key.
GMC-I Messtechnik GmbH 11
4.3 Adjusting Contrast
Select any switch position except for Function Test or Off.
Access the Setup... menu.
Enter
Activate contrast adjustment.
Press and hold the key.
Adjust contrast.
Return to the Setup menu.
Store the contrast setting to permanent memory with the save function.
4.4 Configuring Device Parameters
, Setting Date and Time
Device parameters and functions which ar
e valid for all selector switch po-
sitions can be activated o
r deactivated in the Setup... menu with the selec-
tor switch in the Menu position (s
ee section 8 on page 15).
4.5 Configuring Measurement and Sequence P
arameters
Measurement and sequence parameters, as well as functions, can be ac-
tivated or deactivated in the Setup me
nu (switch position: VDE...) for the re-
spective test regulation. Refer to section 11.3 on page 29 for the signifi-
cance of the various parameters.
4.6 Setting Standard-Specific Limit Values (not in IEC 60974-4)
Upon delivery, the limit values set
forth (at the point in time of issue) in ap-
plicable national and international s
tandards are stored to the test instru-
ment. Limit values for each of the r
espective standards can be queried
and changed if required with the Setup > Limit Values menu (with the selec-
tor switch in the VDE... p
osition), but changes can only be made which re-
sult in even stricter testing
than is required by the respective standard.
Newly entered limit values become effective immed
iately. However, these
are only stored to memory permanently after activating the Store function
in the Setup menu for the respective standard.
If the limit values set forth in the standa
rds for certain protection classes
need to be restored despite individualized settings, the All Values per Stan-
dard menu
function in the Limit Values submenu must be selected and ac-
knowledged with the Enter key.
If the limit values set forth in the standa
rds are changed, the instrument’s
device software can be updated via the RS232 port.
4.7 Saving Settings
All of the settings and changes which have b
een entered to the Sequence
and Limit Values menus (switch position: VDE...), and the Zero Point menu
(temperature measurement) (switch position: Menu), as well as the selected
contrast setting are retained until the selector switch is turned, or the test
instrument is disconnected from mains power. If settings and changes
should be retained even after mains power has been interrupted, they
must be saved in the Setup menu for the respective test regulation or se-
lector switch position (acknowledg
e the “Save” function).
12 GMC-I Messtechnik GmbH
5 Classification of Devices Under Test
5.1 Protection Classes
Devices assigned to all of the following p
rotection classes are equipped
with basic insulation, and provide for protection against electrical shock
by means of various additional precautions as well.
Protection Class I Devices
Exposed, conductive parts are connected to the protective conductor so
that they are not charged with voltage if the basic insulation should fail.
Protection Class I + II Devices
Same as protection class I, except that
they also include accessible con-
ductive parts which are not connected to the protective conductor.
Protection Class I + III Devices
Same as protection class I, except that they
also include protection class
III features, e.g. battery operation or safety extra-low voltage (SELV/PELV).
Protection Class II Devices
These devices are equipped with double insulation or reinforced insula-
tion.
Protection Class II + III Devices
Same as protection class II, except that
they also include protection class
III features, e.g. battery operation or safety extra-low voltage (SELV/PELV).
Protection Class III Devices
These devices are powered with safety extra-low voltage (SELV). Beyond
this, no voltages are generated which exceed SELV. These devices may
not be connected to the mains.
Note: The DU
T may only be connected to jacks 1 through 3 at the test in-
strument. Only visual inspection, ins
ulation resistance measurement or
line voltage measurement can be conducted (see parameter “PC III U
V
”
on page 29).
Parameter Classification (Draft IEC 62638 / VDE 0701-0702 with active mains)
(in Sequence... menu)
The SECUTEST S2 N +w always tests in accordance with the strictest limit
values of the respectively selected protection class. The test is failed if this
limit value is exceeded.
However, devices under test exist for wh
ich higher limit values are allow-
able.
If parameter classification is activated (= x), the user is
asked if higher limit
values are permissible for the DUT. If “Yes” is entered, reevaluation ensues
and the DUT may pass the test.
Examples
If the insulation resistance t
est is failed, or if interference suppression ca-
pacitors have been replaced, equivalent leaka
ge current measurement
must be performed on DUTs with heating elements in accordance with
Draft IEC 62638 / VDE 0701-0702.
The test is failed by a DUT with 300 k if the classifica
tion function is de-
activated (= _), but it is passed with activat
ed classification function (= x) if
the question is answered accordingly.
If the DUT is connected via the jacks inst
ead of the test socket, other limit
values apply because higher power consumption is possible in this case
(e.g. part 1 specifies a limit value of 1 mA per kW for equivalent leakage
current).
See also table: “Maximum Allowable Limit Value
s for Equivalent Leakage
Current in mA” on page 20.
6 Abbreviations
E Electrical energy (during function test)
I
Differential current, residual current (during function test)
I
max
Maximum residual current (during function test)
I
LC
,
I
DL
, I
Probe
Leakage current (differential, probe or touch current)
I
DI
Differential current (protective conductor current during
the test sequence)
I
DI wc
Worst case differential current
I
EL
, I-EL Equivalent leakage current
I
EDL
, I-EDL Equivalent device leakage current (protective conductor
current)
I
EPL
, I-EPL Equivalent patient leakage current
I
HL
, I-HL Housing leakage current (probe or touch current)
I
PE
Protective conductor current
IT system The IT system has no dir
ect contact between active con-
ductors and grounded parts: bodies within the electrica
l
system are grounded.
I
V(max)
(Maximum) load current (during function test)
GMC-I Messtechnik GmbH 13
I
C
Clamp current
L Phase conductor terminal at the DUT
N Neutral conductor terminal at the DUT
NC Normal conditions
P Active power (during function test)
PELV
Protective extra-low voltage with grounded secondary side
PE Protective conductor of the device under test
PF Power factor (during function test)
RResistance
R
INS,
R-INS Insulation resistance
R-INS NL-PE Insulation resistance: neutral conductor to PE
R-INS NL-PE Insulation resistance: neutral conductor to protective
conductor
R-INS LN-W Insulation resistance: LN to welding circuit W
R-INS W-PE Insulation resistance: welding circuit W to protective con-
ductor PE
R
PE
, R-PE Protective conductor resistance
R-PEMains Protective conductor resistance limit value for
+mains: DUT with mains power cable
-mains: DUT without mains power cable
(protective conductor resistance limit value for mains
power cable only = 0.1
S Apparent power (during function test)
SELV Safety extra-low voltage, secondary side not grounded
U
AC/DC
Alternating/direct voltage
U
REF
Reference voltage: voltage to which all leakage voltages
make reference (as a rule nominal line voltage)
U
INS
, U-INS Test voltage for insulation measurement
U
LN
, U-LN Line voltage
U
MEAS
Voltage with which testing was executed.
Displayed for all leakage current measurements.
U
probe
Probe voltage
t On-time (during function test)
T, Temp Tem perat ure
ZVEH General Association of German Electricians
7 Connecting the Device Under Test
➭ Connect the DUT in accordance with the schematic diagrams included in the online
help function.
Connection of the DUT to the test instrument depends upon:
• Type of connection:
– With plug (“to test socket” parameter), applies to EL1 adapter as well
– Without plug, single or multi-phase connection (“to jacks” parameter)
– No connection at tester (“permanent connection” parameter)
Whether or not an adapter is used (= parameter connection type):
– AT16-DI/AT32-DI (also for AT3-I I S and AT3-I I I E for tests in selector
switch position VDE
0544-4, see note on the following page)
– AT3-med to socket, adapter for devices
which are equipped with 5-pole, 16 A CEE plugs
– AT3-I I I E to socket, adapter for devices which are equipped 5-pole,
32 A CEE plugs;
See AT3-III operating instructions regarding the test sequence
(for tests with AT3-I I I E in selector switch position VDE 0544-4,
choose AT16-DI/AT32-DI)
–
EL1
to probe, adapter for single-phase devices with earthing contact plug
– VL2E to socket, adapter for devices
which are equipped with 5-pole, 16 or 32 A CEE plugs.
•
Its protection class
(I, II, III, I + II, I + III or II + III) (see section section 5.1 for meanings).
Note
The DUT must be switched on for all tests. Switches, relays,
temperature regulators etc. must all be taken into consideration.
The test instrument automatically recognizes whether or not the DUT is
connected to jacks 1 through 3. The test instrument also detects whether
or not a DUT has been connected to the test socket. As a default setting,
the program sequence assumes that the plug from the DUT has been
connected to the test socket.
Note
Protection Class II Devices with Protection Class I Mains Plug:
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 from
protection class I to protection class II in the initial menu.
14 GMC-I Messtechnik GmbH
If the test instrument is unable to automatically recognize the type of con-
nection, the r
ecommended connection setup should be double checked
and determined manually if necessary.
➭ P
osition the cursor at the second line in the start menu for the test sequence.
➭ A selection
of possible connection setups can be displayed by activating the key.
➭ Select
the desired connection setup with the scroll key and acknowledge with the
key.
Note regarding the application of adapters AT3-I I S and AT3-I I I E
in selector switch position IEC 60974-4 / VDE 0544-4
In this switch position it is only possible t
o perform direct leakage current
measurements. Differential current measurements are without function
here. For this reason, the measuring cables of the respective adapter may
not be connected to jacks 2 and 3 of the SECUTEST S2 N +w test instru-
ment.
When entering the parameters in the
second headline of the start menu
(as described above), „Adapter 16/32 DI“ must be selected as measuring
connection.
The question referring to the selector switch p
osition at the adapter must
be answered with „no“ (upward cursor key
).
Note regarding connection types EL1 and VL2E: Aft
er once selecting connec-
tion type EL1 or VL2E, this selection c
an be specified for all following tests
under save in the setup menu for the test sequence in accordance with
the standard, until the connection type is once again changed.
Skipping the Protective Conductor T
est for Fully Insulated Devices
Assume that you need to t
est a fully insulated protection class I device
(e.g. a monitor, a submersible pump etc.), which doesn’t have a protective
conductor which exits the device.
Whether or not the protective conductor test can be skipped in this case
sh
ould be decided by a qualified electrician.
The protective conductor test can be
skipped by pressing the key as
soon as the following prompt appears: “
Connect the probe to the DUT’s
protective conductor”.
Testing Several Protective Conductor Connections using the “
Automatic Recogni-
tion of Measuring Point Change” Function wit
h the Switch in the VDE... Position
During protective conductor measurement, the t
est instrument recognizes
whether or not the test probe is in contact with the protective conductor,
which is indicated by means of two different acoustic signals.
This function can be set up with the switch in the
Menu position in the
Setup... menu with the help of the “Auto Measuring Point” function in the
Test Sequence submenu.
Protective Conductor and Insulation Resi
stance 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 disconnect the neutral con-
ductor N inside the device under test.
Measuring Touch Current (absence of voltage)
Make sure that the contacted parts are not grounded.
GMC-I Messtechnik GmbH 15
8 Configuring Device Parameters
Menu
General device parameters can be config-
ured and saved in the
Setup
submenu with
the selector switch in the
Menu
position.
Select submenu and acknowledge.
Select a parameter, acknowledge, change and acknowledge the change.
Limit values ...
Settings x / – = function activated / deactivated
Illumination Background illumination for the L
CD. One of three
different conditions can be selected* with the up and
down scroll keys: x: continuously on, –: off
Numbers 1 through 9: duration in minutes after
whi
ch illumination is automatically deactivated.
* The background illumination of test instruments equipped with panels produced
as of 2014 can no longer be deactivated.
Test Time Duration of a single test (0 255 seconds)
Reference Voltage Voltage to which leakage current is related (as a rule
nomin
al line voltage)
Earth Fault During the short-circuit test, t
esting is also performed
to determine whether or not a connection exists
between L/N and PE (short-circuit to exposed con-
ductive part). We assume that a short-circuit to an
e
xposed conductive part exists in the event of leak-
age current greater than 15 mA from L/N to PE. This
value
should be increased for some DUTs (in particu-
lar high-current consumers), because greater leak-
age currents are present.
Mains Wait
Line voltage is initially applied to the test socket. However,
testing does not begin until after the number of seconds
selected in “Mains Wait” has elapsed, e.g. in order to sup-
press measured values during the warm-up phase.
Auto-Mode x: Most messages are suppressed for fully auto-
mated test sequences.
Test Sequence ...
Settings x / – = function activated / deactivated
Single-Fault
If the single-fault condition has been activated, the test
is interrupted as a failure as soon as an error occurs
.
Auto Class PSI Test results (passed or failed ) for the various select
or
switch positions are automatically assigned to the 8
statistics channels.
With Operating Error
Measurement results are compensated by taking
operating error into consideration (measuring error).
IT System
Testing in IT systems can be performed by suppress-
ing tests for U
PE-N
. The U
PE-N
test determines whether
or not voltage is present at PE. (Leakage current mea-
surement results may otherwise be distorted.)
Acst Sig, Seq An acoustic signal is generated for: incorrect connec-
tion of the DUT, error in the e
lectrical supply system
and the next test step.
Acst Sig, Meas An acoustic signal is generated for: measured value
fluctuations and t
est current polarity reversal.
Auto Point An acoustic signal indicates whethe
r or not the probe
is connected to the protective conductor. The test
sequence is run automatically.
Rapid signal frequency: probe connected
Slow signal frequency: next measuring point
Direct Printing See section 13 on page 43.
Reports ... Reports which have been saved to memory can be
select
ed from a list with an ID number and displayed
(see section 13 on page 43).
Secustore Optimize the data transfer for the SECUSTORE adapter
connection (in this configurat
ion, no data can be
saved to the SI module. Neither is a test report sig-
nalled to the
RS232 interface.
Service ... – Time and date settings
(if a SI module is used, the same time and date
must also be entered to the SI menu)
– Service functions (password required)
16 GMC-I Messtechnik GmbH
9 Individual Measurements
Menu
9.1 Measuring Protective Conductor Resistance
Definition
Protective conductor resistance
is the sum of the following re-
sistances:
• Connector cable or device
connect
or cable resistance
• Contact resistance at plug
and t
erminal connections
• Resistance of the extension
ca
ble if applicable
Resistance is measured:
• Between each exposed c
onductive part of the housing and the earthing
contacts at the mains and the device plug (if a removable mains con-
nector cable is used), or the protective conductor terminal for perma-
nently installed devices.
• As a 4-pole measurement
• Between the earthing contacts at the mains plug and the earthing con-
tacts at the device plug for
device connector cables
• Between the earthing contacts at the mains plug and the earthing con-
tacts at the coupling socket for e
xtension cables
Connecting Protection Class I Devices to the Test Socket
When the DUT is connected, resistance is measur
ed between the protec-
tive conductor terminal at the test socket o
r at the PE jack, and the probe
connection at the DUT (contact with conductive parts of the housing).
➭ In or
der to measure protective conductor resistance, contact a conductive part of the
housing with the probe, which is connected to the protective conductor.
During measurement, the c
onnector cable must only be moved to the ex-
tent it is accessible during repair
, modification or testing.
If a change in resistance occurs during the manua
l test step of the conti-
nuity test, it must be a
ssumed that the protective conductor is damaged,
or that one of the connector contacts is no longer in flawless condition.
Selecting Polarity
Test current po
larity can be reversed by pressing the key.
Selecting Test Current Amperage
You can switch back and forth b
etween the two test current amperages
(200 mA DC or 10 A AC) by
pressing the key.
Testing with 10 A Test Current
Maximum tes
t time is 30 seconds (fixed value) for the 10 A test current.
After this test time has elapsed, the last measured value is frozen and
“Data hold, measurement stopped” appears at the display. If the test in-
strument heats up, the test ca
nnot be repeated until after a waiting time of
1 minute has elapsed.
When the 10 A test current is used, the last measure-
ment can be repeated if the test is not passed.
GMC-I Messtechnik GmbH 17
Testing Extension Cables
See section 11.4 on page 30 regarding the test sequence.
Note
“DUT connection: PC I/II” is not displayed when the test is per-
formed individually, but rather only d
uring the automatic test
sequence.
Combined Test – Differential Protective Conductor Resistance
Zero balancing is also
possible for protective conductor measurement. With
zero balancing, all subsequent measurements are adjusted with an offset
such that 0 is
displayed for a selected reference point which is con-
nected to the protective conductor. When t
est points are contacted with
the probe which are electrically connected to this reference point, differen-
tial resistance R
PE
between the reference point and the contacted test
point is displayed.
The mains enabling key
must be activated during measurement in
order to perform zero balancing. The acq
uired value can either be applied
(the value remains in memory until the instrument is disconnected from
mains power), permanently saved or deleted.
Maximum Allowable Limit Values for P
rotective Conductor Resistance
for Connector Cables with Lengths of up to 5 m
Test Standard Test Current
Open-Circuit
Vo
ltage
R
PE
Housing –
Device Plug
R
PE
Housing –
Mains Plug
Draft IEC 62638 /
VDE 0701-0702
IEC 62353:2007
> 200 mA
or
10 A~
4 V < U
L
< 24 V
0.3
+ 0.1
1
for each addi-
tional 7.5 m
IEC 60974-4 /
VDE 0544-4
0.2
1
Total protective conductor resistance of max. 1
9.2 Insulation Resistance R
INS
.
Definition
W
i
t
h
P
C
I
I
Protection Class I
Insulation resistance is mea-
sured between short-cir-
cuited mains terminals and
the p
rotective conductor.
Protection Classes II and III
Insulation resistance is mea-
sured between short-cir-
cuited mains terminals and
e
xternal conductive parts
which can be contacted with
the probe.
Exception for Permanently Installed P
rotection Class I Devices
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 disconnect neutral conductor
N inside the device under test.
➭ Connect the pr
obe to phase conductor L at the device under test in order to measure
insulation resistance.
18 GMC-I Messtechnik GmbH
Sequence
Attention!
!
Insulation Resistance Measurement (equivalent leakage current)
Testing is conducted with up to 500 V. Current limiting is utilized
(I < 3.5 mA), but if the terminals (3 or 2) are touched, electrical
shock may oc
cur which could result in consequential accidents.
If the DUT is connected via jacks
1 through 3, special care must
be taken to avoid contact with open cables.
Note
All switches at the device under test must be set to the on posi-
tion during measurement of insulation r
esistance, including tem-
perature controlled switches and t
emperature regulators as well.
Measurement must be performed in all program steps for
devices equipped with program controllers.
R-INS
Start measurement.
Nominal voltage is 500 V DC in this case.
Nominal voltage can be adjusted within a range of 50 V to 550 V DC.
Note
When insulation measurement is first started from the menu,
nominal voltage is always set to 500
V. Open-circuit voltage is
always greater than nominal voltage.
Test Standard Test Vol tage
R
INS
LNPE
LN
Probe
Probe
PE
PC III Heating
Draft IEC 62638 /
VDE 0701-0702
500 V
1 M 2 M 5 M 0.25 M 0.3 M *
IEC 60974-4 /
VDE 0544-4
2 M 5 M 5 M
Minimum Allowable Limit Values for Insulation Resistance
* With activated heating elements (if heating power > 3 kW and R
INS
< 0.3 M:
leakage current measurement is required)
Notes
Insulation resistance and/or leakage curr
ent must be measured at all ex-
posed, conductive parts for protection class II and III devices, as well as
f
or battery powered devices.
Batteries must be disconnect
ed during testing of battery powered de-
vices.
During the test of the primary side LN t
o standard probe 1 (jacks 4-5), the
protective conductor of the test socket is connected with standard probe
1.
If the test is to be conducted without the p
rotective conductor, the test
may not be performed via the test socket, but must be performed via a
second probe connection at jacks 2 and 3.
GMC-I Messtechnik GmbH 19
9.3 Measuring Leakage Current
Attention!
!
It is absolutely essential to assure that the device under test is
operated with line voltage during performance of the leakage
current measurement. Exposed conductive parts may conduct
dangerous contact voltage during testing, and may not under
any circumstances be touched (mains power is disconnected if
leakage current exceeds approx. 10 mA).
Select the I
xx
measurement and start.
10 10
2
10
3
10
4
10
5
10
6
+20
0
-20
-40
-60
Frequency (f) in Hz
Relative Magnitude (dB):
U(f)
U(f=10)
Each time line voltage is
applied to the test socket,
L and
N are reversed, if this
function has been se-
lected in the leakage cur-
rent menu (see section 9.3
on page 19).
Frequency response is
tak
en into consideration in
accordance with the dia-
gram to the right when
leakage curr
ent is mea-
sured.
9.3.1 Touch Current I
T
(welding circuit leakage current)
A
2
L
N
1 Test socket (without protective conductor
contact)
2 Device housing
1
Current which flows from housing
parts which are not connected to
the p
rotective conductor via an
external conductive connection
to earth or another part of the
housing. Flow of current via the
protective conductor is excluded
in this case.
The current’s AC component is
mea
sured. The DC component
can also be measured by means of an individual measurement (but not
with a test sequence).
9.3.2 Protective Conductor Current (primary leakage current), Differential Current
Method (I
DI
)
Sum of instantaneous curr
ent values which flow via the L and N conduc-
tors at the device’s mains connection (a
lso known as differential current).
Differential current is practically identical to fault current in the event of an
error. Fault current: Current which is caused by an insulation defect, and
which flows via the defective point.
Attention: Differ
ential current includes touch current as well.
Maximum Allowable Limit Values in mA
Test Standard I
PE
(I
DI
)
I
T
NC
Draft IEC 62638 /
VDE 0701-0702
SC I: 3.5
1 mA/kW *
0.5
IEC 60974-4 5 mA 10 mA
* For devices with heating power of greater than 3.5 kW
Note 1:Devices which are not equipped with accessible parts that are connected to
th
e protective conductor, and which comply with requirements for touch
current and, if applicable, patient leakage current, e.g. computer equipment
with shielded power pack
Note 2:Permanently connected devices with protective conductor
Note 3:Portable x-ray devices with mineral insulation
Key
I
T
Touch current (welding circuit leakage current)
I
PE
Current in the protective conductor (primary leakage current)
20 GMC-I Messtechnik GmbH
9.4 Equivalent Leakage Current
General
Measurement of equivalent leakage current is required for:
• Draft IEC 62638 / VDE 0701-
0702 aft
er passing the insula-
tion test
~
Device
Probe
mA
PE
L
N
Under Test
Test socke t
4-5
Test socke t
Equivalent Device Leakage Current I
EDL
. IEC 62353 (VDE 0751-1)
Measurement of equivalent device lea
kage current is required for:
• Electrical medial devices in accor
dance with IEC 62353 (VDE 0751-1)
Probe
Device
~
mA
L
N
PE
Under Test
Test socke t
4-5
Test socke t
Prerequisites
A high-impedance power supply
is conne
cted between the short-
circuited mains terminals and all
exposed metal parts of the hous-
ing (which are connected to one
another).
Measurement
Current which flows over the in-
sulation at the device under test
is measur
ed.
Equivalent Patient Leakage Current I I
EPL
, IEC 62353 (VDE 0751-1)
mA
Probe
Device
L
N
~
PE
Under Test
Test socket
4-5
Prerequisites
A high-impedance power supply
is connec
ted between respec-
tively short-circuited L, N, PE and
the p
robe.
Measurement
Measurement is always per-
formed using an AC source with
curr
ent limiting. Differing mains
voltages are taken into consider-
ation.
Maximum Allowable Limit Values for Equivalent L
eakage Current in mA
Test
Standard
I
EL
I
EDL
I
EPL
Draft IEC 62638 /
VDE 0701-0702
SC I: 3.5
1 mA/kW
1
PC II: 0.5
IEC 62353: 2007
(VDE
0751-1)
PC II 0.2
Type
BF
5
SC I (PE or parts connected to PE)
1
Type
CF
0.05
Permanently connected devices with PE
10
Portable x-ray devices with additional PE 5
Portable x-ray devices without additional PE
2
Devices with mineral insulation 5
I
EL
Equivalent leakage current
I
EDL
Equivalent device leakage current
I
EPL
Equivalent patient leakage current
PE Protective conductor
1
For devices with heating power 3.5 kW
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