GMC METRATESTER 4 User manual

Operating Instructions
3-348-580-15
10/5.02
METRATESTERâ4, 5 and 5-F
Tester for DIN VDE 0701-1:2000 and 0702:1995

2 GOSSEN-METRAWATT
(1) Mains plug
(take-up spool at back of housing
for mains cable)
(2) Signal lamp for testing the
mains protective conductor
(3) Alligator clips for attachment
to the test probe (3a)
(3a) Test probe
(4) Contacting surface for contact finger
(5) Measuring range selector switch
(6) Connector jack/terminal for testing for
the absence of voltage at conductive
parts at the DUT per DIN VDE 0701
Part 240
(7) Mains outlet
(8) Test socket
(9) Connector jack/terminal for DUT
phase conductors (wired parallel
to the socket)
(10) Connector jack/terminal for DUT
protective conductor (wired parallel
to test socket)
(11) LCD display (description see page 29)
(12) Carrying handle
(13) Error lamp (METRATESTERâ5/5-F only)
(14) Infrared interface
(METRATESTERâ5 only)
(15) Transmission key
(METRATESTERâ5-F only)
METRATESTER 4
(8) (9) (10) (11) (12)
(7)
(6) (5) (4)
(3)
(2)
(1)
(3a)

GOSSEN-METRAWATT 3
METRATESTERâ5/5-F
METRATESTERâ5/5-F Display
Display text subject to change without notice.
(8) (9) (10) (11) (12)
(7)
(6) (5) (4)
(3)
(2)
(1)
(13)
(14)
(3a) (15)
IDiff mA INetz A MW
RSL >0.3
>1.0
RISO<0.5
<2.0
IEA >7.0
>15
IA>0.25
>0.5
mA
mA
W
IDiff mA INetz AInsulation
Resistance
P
Resistance
Equivalent
Leakage Current
Leakage Current/
Contact Current
Residual
Current
Secondary
Current
Indication of Limit Values
for DIN VDE 0702: 1995
E

4 GOSSEN-METRAWATT
Contents Page
1 Safety Features and Precautions ..................................................................................6
2 Applications ...................................................................................................................7
3 Operating and Display Elements ...................................................................................7
3.1 Error and Limit Value Messages ....................................................................................................... 8
4 Mains Connection .......................................................................................................... 9
4.1 Connecting the Tester ...................................................................................................................... 9
4.2 Testing Protective Conductor Potential ............................................................................................. 10
4.3 Measuring Mains Voltage ................................................................................................................ 10
4.4 Connecting the Device Under Test to the Test Instrument ................................................................. 11
4.4.1 Safety Class I DUT with Mains Plug ................................................................................................ 11
4.4.2 Safety Class II DUT ........................................................................................................................ 11
4.4.3 DUT Without Mains Plug or Safety Class III DUT ............................................................................... 11
4.4.4 3-Phase DUT ................................................................................................................................. 11
4.5 General Measuring Procedures ....................................................................................................... 12
4.6 Residual Current Monitoring (for METRATESTER‚5/5-F only) .............................................................. 12
5 Testing Devices per DIN VDE 0701, Part 1: 2000 ........................................................13
5.1 General ......................................................................................................................................... 13
5.2 Visual Inspection ............................................................................................................................ 15
5.3 Measuring Protective Conductor Resistance ..................................................................................... 15
5.4 Measuring Insulation Resistance ..................................................................................................... 16
5.5 Measuring Equivalent Leakage Current ............................................................................................ 16
5.6 Measuring Contact Current ............................................................................................................. 17
5.7 Measuring Residual Current (METRATESTER‚5/5-F only) ................................................................... 17
KS 13 Accessory Cable Set

GOSSEN-METRAWATT 5
6 Testing Devices per DIN VDE 0702:1995 .....................................................................18
6.1 General ..........................................................................................................................................18
6.2 Measuring Protective Conductor Resistance .....................................................................................18
6.3 Measuring Insulation Resistance ......................................................................................................19
6.4 Measuring Equivalent Leakage Current .............................................................................................20
6.5 Measuring Contact Current ..............................................................................................................20
6.6 Measuring Residual Current (METRATESTER‚5/5-F only) ...................................................................20
7 Testing Data Processing Systems and Office Machines per DIN VDE 0701, Part 240 .21
7.1 General ..........................................................................................................................................21
7.2 Visual Inspection .............................................................................................................................21
7.3 Protective Conductor Test ................................................................................................................21
7.4 Testing for the Absence of Voltage at User Accessible, Exposed Conductive Parts ...............................23
8 Measuring Load Current from the Mains Outlet ..........................................................24
9 METRATESTER‚5 Infrared Interface .............................................................................25
10 METRATESTER‚5-F Radio Interface .............................................................................26
10.1 Applications ....................................................................................................................................26
10.2 Initial Start-Up .................................................................................................................................26
10.3 Using the Radio Interface .................................................................................................................26
10.4 Radio Interface Characteristic Values ................................................................................................26
11 Technical Data .............................................................................................................28
12 Maintenance ................................................................................................................30
13 Repair and Replacement Parts Service
DKD Calibration Lab
and Rental Instrument Service ....................................................................................31
14 Product Support ..........................................................................................................31

6 GOSSEN-METRAWATT
1 Safety Features and Precautions
The tester is manufactured and tested in accordance with the following standards:
IEC/EN 61010-1/
VDE 0411-1 Safety regulations for electrical measuring, control,
regulating and laboratory devices – general requirements
and DIN VDE 0404 Devices for the technical safety inspection of electrical equipment;
Part 1: general requirements, and Part 2:
periodic device testing
When used for its intended purpose, the safety of the user, the test instrument and the device
under test (electrical equipment) is assured.
Read the operating instructions carefully and completely before placing your test instrument into ser-
vice, and follow all instructions contained therein. Make sure that the operating instructions are avail-
able to all users of the instrument.
The tests may only be conducted under the supervision of a qualified electrician. The user must be in-
structed by a qualified electrician in the perfomance and evaluation of the test.
Observe the following safety precautions:
• The device may only be connected to a mains outlet rated at 230 V which is protected
with a fuse or circuit breaker rated at max. 16A.
• No measurements within electrical systems are allowed.
• Be prepared for the occurrence of unexpected voltages at devices under test. For exam-
ple, capacitors may be dangerously charged.
• Make certain that connector cables are not damaged, e.g. damaged insulation, interrup-
tions etc.
Attention!
!
Devices under test may only be connected to the mains outlet after they have
successfully completed safety testing in accordance with DIN VDE 0701 or
DIN VDE 702!
Repair, Parts Replacement and Balancing
Voltage conducting parts may be exposed when the device is opened. The device must be
disconnected from all sources of voltage before repair, replacement of parts or balancing. If
repair or balancing of an open, live device cannot be avoided, this may only be performed by
trained personnel who are familiar with the dangers involved.
Errors and Extraordinary Strains
If it may be assumed that the device can no longer be operated safely, it must be removed
from service and secured against unintentional use. Safe use can no longer be relied upon,
• if the device demonstrates visible damage,
• if the device no longer functions,
• after lengthy periods of storage under unfavorable conditions,
• after excessive, transport related strains.
Approvals
Branding of the METRATESTERâ4 and 5 testers with the VDE GS mark
has been approved by VDE testing authorities.

GOSSEN-METRAWATT 7
2 Applications
The tester is intended for the testing and measurement of repaired or modified electrical
devices in accordance with DIN VDE 0701 or DIN VDE 702. These regulations require the
measurement of protective conductor resistance, insulation resistance and equivalent leak-
age current for repaired or modified electrical devices, as well as testing for the absence of
voltage at exposed, conductive parts for data processing systems and office machines.
Testing for the absence of voltage at the mains connection protective conductor and line volt-
age measurements can also be performed with this instrument. The device under test can be
connected to mains power at the mains outlet integrated into the tester, which provides for
the measurement of power consumption and the testing of functions.
Attention!
!
Limit values displayed at the instrument make reference to periodic testing
requirements set forth in VDE 0702: 1995.
3 Operating and Display Elements
(1) Mains Plug
The tester is connected to the 230 V mains outlet with the mains plug. If no earthing contact
socket is available, or if only three-phase current is available, the KS13 cable set can be used
to establish a connection.
The mains connection must be fused. Maximum nominal rating: 16 A!
(2) PE Signal Lamp for Protective Conductor Testing
The PE signal lamp lights up, if a potential difference of ³100 V occurs
between the contacting surface (4) and the earthing contact at the mains plug (1).
(3) Alligator clip (gripper clip for attachment to the test probe)
Connect the housing of the device under test with the alligator clip for measurement of pro-
tective conductor resistance.
(4) Contacting Surface for Contact Finger
The PE signal lamp (2) lights up, if a potential difference of ³100 V occurs between the PE
protective conductor at the mains plug (1) and the contacting surface.
The contacting surface is electrically isolated from all terminals, as well as from the measuring
circuit, and thus conforms to protection class II!
(5) Measuring Range Selector Switch
Measuring ranges can be selected with the measuring range selector switch. Displayed val-
ues at intermediate switch positions have no significance.
(6) Connector Jack/Terminal for Measurement of Contact Current at Conductive
Components at the Device Under Test
This terminal is intended for the measurement of contact current at exposed conductive parts
which are not connected to the protective conductor (see chapter 7.4, page 23).
(7) Mains Outlet
The DUT can be connected to the integrated mains outlet for the measurement of power
consumption and functions testing.
METRATESTERâ5/5-F: Residual current measurement is performed in this way as well.
Overcurrent protection is provided by the mains fuse or circuit breaker, see (1).

8 GOSSEN-METRAWATT
(8) Test Socket
The DUT is connected to the test socket for the measurement of protective conductor resis-
tance, insulation resistance and equivalent leakage current in accordance with DIN VDE 0701
and DIN VDE 0702, if the DUT is equipped with a mains plug.
(9) Connector Jack/Terminal for DUT Phase Conductors
This terminal is wired in parallel to the two short-circuited phase conductor terminals at the
test socket (8). The DUT phase conductors can be connected to this jack/terminal, if the DUT
is not equipped with a mains plug.
(10) Connector Jack/Terminal for DUT Protective Conductor
This terminal is wired in parallel to the protective conductor terminal at the test socket (8). The
DUT protective conductor can be connected to this jack/terminal, if the DUT is not equipped
with an earthing contact plug. Beyond this, exposed conductive parts at the device under
test must be connected to this jack for insulation testing and the measurement of equivalent
leakage current.
(11) LCD Display
Measured values are displayed in digital form at the LCD.
(12) Carrying Handle
The carrying handle can be folded out.
(13) Error Lamp
The red error lamp indicates that limit values have been exceeded during the measurement of
protective conductor and insulation resistance, equivalent leakage, contact and leakage cur-
rent, as well as residual current. The limit values apply for periodic testing in accordance with
DIN VDE 0702:1995.
KS 13 Accessory Cable Set
The KS 13 cable set consists of a adapter socket with three permanently connected cables,
3 measurement cables, 3 plug-on pick-off clips and 2 plug-on test probes. With the KS 13
the tester and the DUT can be connected, even if no earthing contact socket is available for
the mains connection, or no earthing contact plug is present at the DUT.
3.1 Error and Limit Value Messages
The following limit values apply for DIN VDE 0702: 1995
Error Message METRATESTERâ4/5/5-F Condition PE Signal Lamp
Protective conductor potential, at mains UB³25 V If contact surface is contacted
Error Messages
METRATESTERâ5/5-F
Condition Red Error Lamp
Continuously Lit
Limit Values
are Displayed
Continuous
Acoustic Signal
Protective conductor resistance RSL >0.3W· · —
RSL >1W· · ·
Insulation resistance RISO <0.5MW· · ·
RISO <2.0MW· · —
Equivalent leakage current IEA >7.0mA ··—
IEA >15mA ···
Leakage current / contact current
(substantiation of absence of voltage)
IA>0.25mA ··—
IA>0.5mA ···
Residual current IDiff ³3.5 mA ·—·

GOSSEN-METRAWATT 9
Residual Current Limit Value Violations
The METRATESTERâ5/5-F is equipped with a selector switch independent, residual current mon-
itoring function. If the red error lamp lights up and no message regarding a limit value violation
appears at the display, residual current at the mains outlet is dangerously high – regardless of
the selector switch setting. If this is the case, it is advisable to measure residual current (dif-
ferential current) by turning the selector switch to the “IDIFF” position.
Only the displayed numeric value should be considered when evaluating residual current with
the selector switch in the “IDIFF” position. The error lamp may be caused to light up as a result
of residual current monitoring for values of as low as approximately 3.2 mA. The error lamp
lights up in any case as of 3.5 mA.
4 Mains Connection
4.1 Connecting the Tester
➭Connect the tester to the 230 V mains with the mains plug (1). If no earthing contact
socket is available, or if only a three-phase socket is available, connection of the phase
conductors, the neutral conductor and the PE conductor can be accomplished with the
help of the adapter socket. It includes 3 permanently connected cables and is included
with the KS 13 accessory cable set.
Attention!
!
The mains connection must be fused! The fuse may not exceed a rating of 16 A!
The pick-off clips on the cables at the adapter socket may only be connected in the
voltage-free condition!
If mains voltage is present, characters are displayed at the LCD regardless of the position of
the measuring range selector switch, even if no DUT has been connected. Thus the presence
of characters at the display indicates the presence of voltage – independent of measuring
range selector switch position.
The mains voltage value is indicated at the display in the “250 V~” selector switch position.
In all other switch detent positions, characters are displayed which have no correlation to a
measured value, if a DUT has not been connected.
KS13
KS13
KS13
yellow-green
yellow-green
yellow-green
only possible in TN-C systems
L1
N
PE
L1
L2
L3
N
PE
L1
L3
N
L2

10 GOSSEN-METRAWATT
4.2 Testing Protective Conductor Potential
➭Bring the contact finger into contact with the contacting surface (4) and, at the same
time, with a grounded object (e.g. a water pipe).
The PE signal lamp (3) must not light up! Potential between the mains plug protective
conductor (1) and the contacting surface (4) is then £100 V.
Note!
+
The PE signal lamp (3) does not light up, if no mains voltage is present between L and
N at the mains plug (1), or if L and PE are reversed at the mains connection. If, after
having connected the DUT in accordance with chapter 4.1, page 9, you determine,
that no characters are displayed at the LCD, the mains connection should first be
inspected – e.g. with the PROFi TESTâ0100S-II tester.
However, if the PE signal lamp (3) lights up when contact is made with the contacting surface
(4), potential between the protective conductor at the mains plug (1) and the contacting sur-
face (4) is ³25 V, i.e. voltage is present at the protective conductor.
Note!
+
Stray voltages may occur due to handling of the DUT, which cause the PE signal lamp
(3) to light up. For example, this may occur if a device is held in the hand which has
been connected to the test socket (8) due to the resultant occurrence of a capacitive
voltage divider. Touch a grounded object as described above in this case.
Attention!
!
If testing of protective conductor potential indicates that voltage is present at the mains
protective conductor, no measurements may be performed with the tester. In such a case
voltage is also present at the exposed earthing contacts of the mains outlet (7) and at
the jack (6), which may represent a hazard for the user. Immediately disconnect the
tester from the mains and arrange for the correction of the mains connection error.
Voltage at the mains protective conductor also distorts measured values for the
following tests:
– Measurement of contact current per DIN VDE 0701:2000 or DIN VDE 0702:1995
– Absence of voltage per DIN VDE 0701-240:1986 (chapter 7.4, page 23)
– Residual current measurement (METRATESTERâ5/5-F only)
4.3 Measuring Mains Voltage
➭Set the measuring range selector switch to “250 V~”
➭Read the measured value at the LCD.
Mains voltage must lie within the allowable range of 207 to 253 V.

GOSSEN-METRAWATT 11
4.4 Connecting the Device Under Test to the Test Instrument
The DUT must be connected to the test socket (8), or to the jacks or terminals (9 and 10)
which are connected in parallel to the test socket for the measurement of protective conduc-
tor resistance, insulation resistance and equivalent leakage current. Terminal (9) is connected
to the short-circuited phase conductor jacks at the test socket (8), and terminal (10) is
connected to the earthing contact at the test socket (8). Use one of the following test setups,
depending upon the type of device under test.
4.4.1 Safety Class I DUT with Mains Plug
4.4.2 Safety Class II DUT
4.4.3 DUT Without Mains Plug or Safety Class III DUT
4.4.4 3-Phase DUT
To test socket
Switch the DUT on!
To housing for measurement of protective conductor resistance
Tes t c a ble, e.g. K S13
Switch the DUT on!
To test socket
To expos e d m e tal
parts
N
L1
PE
KS13
Switch the DUT on!
To housing for measurement of protective conductor resistance
SCIII
N
L1
L2
PE
L3
Switch the DUT on!
To housing for measurement of protective conductor resistance

12 GOSSEN-METRAWATT
4.5 General Measuring Procedures
Line voltage must lie within the allowable range of 207 to 253 V for all of the following mea-
surements. This assures that the accuracy of displayed measured values corresponds with
the values specified under “Technical Data” (chapter 11, page 28).
Line voltage can be measured by setting the measuring range selector switch to the “250 V”
position (see chapter 4.3, page 10).
Measuring ranges for the measurement of protective conductor resistance, insulation resis-
tance, equivalent leakage current and contact current are protected against overload in the
event that interference voltages of up to 250 V are applied inadvertently.
Always start with the measurement of protective conductor resistance for safety class I
devices. Insulation resistance and equivalent leakage current cannot be measured if the pro-
tective conductor does not function properly. This connection must be established externally
for safety class II devices (see chapter 4.4.2).
Note!
+
Please note that overflow is indicated at the display during the measurement of pro-
tective conductor resistance and insulation resistance, if the terminals are open or if
the upper range limit is exceeded. In this case, only the character “1” is displayed at
the left-hand side of the LCD (11).
Attention!
!
Measuring current is reduced after approximately 10 minutes in the event of a
long-term short-circuit during insulation testing. Excessive temperature is indicated
at the display in this case (see chapter 11 “Display – Excessive Temp.”). If this display
appears, nominal current of 1 mA as required by DIN VDE 0413 and DIN VDE 0701
is no longer assured. After the short-circuit has been eliminated, and after a brief
cool-down period, the message is cleared from the display and subsequent
measurements once again fulfill VDE requirements.
Evaluating Measured Values
In order to make absolutely sure that limit values for insulation resistance are not fallen short
of, instrument measuring error must be taken into consideration. Minimum required display
values for insulation resistance can be taken from the following table.These values take max-
imum instrument error into consideration (under nominal conditions of use). The indicated
values correspond to the required limit values (DIN VDE 0413, part 1). Intermediate values
can be interpolated.
4.6 Residual Current Monitoring (for METRATESTERâ5/5-F only)
For your safety, residual current at the DUT connected to the mains outlet is continuously
monitored by METRATESTERâ5/5-F instruments. If residual current reaches a value of
greater than 3.5 mA, danger is indicated by means of a continuous acoustic signal.
Automatic shutdown does not occur (see chapter 3.1, page 8).
Limit Value MWMinimum Display Value, METRATESTERâ4 Minimum Display Value,
METRATESTERâ5/5-F
0.25 0.280
2M
W range
0.33
0.3 0.335 0.38
0.5 0.555 0.60
1.0 1.105 1.15
2.0 2.25
20 MW range
2.25
7.0 7.75 7.75
10.0 11.05 11.05

GOSSEN-METRAWATT 13
5 Testing Devices per DIN VDE 0701, Part 1: 2000
The limit values specified in the following chapters correspond to current revision levels of
official standards at the time of going to print. Please note that normative legislation is contin-
uously updated to meet the safety requirements necessitated by changing market situations,
and that the listed limit values are thus subject to change. Please contact our update service
department in order to adapt test instruments to new standards.
5.1 General
According to DIN VDE 0701, part 1, edition 2000, repaired or modified electrical devices
must provide users with the same protection against electrical energy as is offered by new
devices. The following tests must be performed to this end, in the order indicated:
1 Visual inspection
2 Protective conductor resistance
3 Insulating characteristics:
if technically sensible, i.e. if the DUT does not include any all-pole,
electrically actuated switches:
– Insulation resistance followed by protective conductor current or equivalent leakage
current
– Other: leakage current during operation (protective conductor current and contact
current), safety extra-low voltage (only at connecting points for safety extra-low
voltage generated within the device under test)
4Functiontest
5 Labelling inspection
6Documentation
Note!
+
Measurement of residual current is only possible with the METRATESTERâ5/5-F.
Changes to DIN VDE 0701-1: 1993
• The standard has been completely revised as regards both layout and technical aspects.
• Test procedures have been adopted for devices whose insulation characteristics cannot
be fully evaluated before initial start-up.
• The limit values for protective conductor resistance and insulation testing have been
re-specified.
• Device-specific supplements in parts 10 through 13 and 260 have been integrated by
means of device-specific appendices E through H in part 1.
• In order to substantiate the insulation characteristics of the device under test, measure-
ment of leakage current with line voltage has been additionally prescribed. This represents a
stiffening of previous stipulations, which takes the ever increasing percentage of devices
with capacitive circuitry into consideration.
•Protective conductor resistance values have been aligned to DIN VDE 0702.
The limit value is:
–0.3
W(for up to 5 meters) plus 0.1 Wfor each additional 7.5 meters.
• The protective conductor for safety class I hand-held electric tools can now be tested
with minimal test currents as well.

14 GOSSEN-METRAWATT
•Insulation resistance for safety class I has been redefined to 1 MW, and to 0.3 MWfor
devices with heating elements. This test is required for all devices for which all charged
insulation is monitored during testing (practically all devices without electrically actuated,
all-pole relays).
The limit values are:
– Safety class I devices under test: 1 MW
– Safety class I DUTs with heating elements: 0.3 MW
– Safety class II devices under test: 2 MW
– Safety class III devices under test: 0.25 MW
– Test voltage (to 0.5 MW) 500 V
The limit value for equivalent leakage current has been adapted to the limit value for
protective conductor current. As opposed to the 1993 version of the regulation, the insulation
test must be passed. Measurement of protective conductor current, by means of either the
residual current method or measurement of equivalent leakage current, must always be
performed and passed after insulation resistance measurement.
•Equivalent Leakage Current
This test must be performed after insulation testing has been passed. The measured
value must be corrected such that it corresponds to the measured value which would
result at line voltage. The METRATESTERâperforms this function electronically.
The limit values are:
– 3.5 mA for safety class I devices whose exposed conductive parts are all connected
to the protective conductor
– 0.5 mA for devices with exposed conductive parts which are not connected to the
protective conductor
•Protective Conductor Current
This test is required for all safety class I devices for which insulation resistance cannot be
measured, and for which all exposed conductive parts are connected to the protective
conductor. If non-polarized mains plugs are used, the test must be performed with the
mains plug poled in both directions.
The following test methods are permissible:
–Direct method if the device under test is set up under insulated conditions
–Residual current method for cases where data transmission cables and gas and water
supply lines cannot be disconnected
Regardless of the test method, the limit values are:
– 1 mA/kW for devices under test with heating elements
and a connected load of greater than 3.5 kW
– 3.5 mA for all other devices under test
•Contact Current
This test is required for all devices whose insulation resistance cannot be measured, and
which include exposed conductive parts which are not connected to the protective con-
ductor. If non-polarized mains plugs are used, the test must be performed with the mains
plug poled in both directions.
The following test methods are permissible:
–Direct method if the device under test is set up under insulated conditions
–Residual current method, only possible if no protective conductor is present
The limit value is 0.5 mA for both measuring methods.

GOSSEN-METRAWATT 15
5.2 Visual Inspection
Visual inspection is performed prior to measurements with the test instrument.
Visual inspection includes:
• Housing and protective covers
• Connections and external cables including fasteners and plugs
• Visible condition of insulation material
• Strain reliefs for cables, anti-kink devices and cable routing
• Fuse links which are accessible to the user (including labeling and inspection
of fuse ratings)
• Cooling vents and air filters
• Pressure relief valves
• Safety relevant labelling
5.3 Measuring Protective Conductor Resistance
The measurement of protective conductor resistance is of course not possible for devices
which are not equipped with a protective conductor (e.g. safety class II and III devices).
➭Connect the device under test as described in chapter 4.4, page 11.
➭Set the measuring range selector switch to the “20 W” position.
➭Read the measured value in “W” from the LCD.
➭Move the cable from the DUT during the measurement, section by section over its entire
length, in order to locate interruptions.
Protective conductor resistance may not exceed the following values:
Maximum Allowable Protective Conductor Resistance Values Depending upon Cable Length
Under no circumstances may a value of 1 Wbe exceeded. The table is also valid for cable
reels and extension cables.
Attention!
!
The alligator clip (3) must make good contact with the housing of the device under
test!
The connector cable must be moved during measurement, section by section over
its entire length – for permanently installed devices only in so far as the cable is ac-
cessible during repair, modification or testing. If the resistance value fluctuates during
this manual test which is essential for continuity testing, it must be assumed that the
protective conductor is damaged, or that one of its connection points is defective.
Defects of this type must be corrected before any further tests are performed.
Length to [m] 5 12. 5 20 27.5 35 42.5 50 more than 50
Max. resistance [W] 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

16 GOSSEN-METRAWATT
5.4 Measuring Insulation Resistance
This measurement may only be performed if the device under test has successfully completed protective conduc-
tor resistance testing. This measurement may not be performed if all-pole electrically actuated
switches are included in the device under test.
➭Connect the device under test as described in chapter 4.4, page 11.
Make sure that the jack (10) is connected to exposed conductive parts at the DUT for safety
class II and III devices.
➭Set the measuring range selector switch (5) to the “2 MW” range (METRATESTERâ4
only) or the “20 MW” range.
➭Activate all functions of the DUT, and be certain, for example, that contacts for tempera-
ture sensitive switches and the like are also closed.
➭Read the measured value in “MW” from the LCD (11).
Insulation resistance may not fall short of the following values:
The following limit values for insulation resistance may not be fallen short of:
5.5 Measuring Equivalent Leakage Current
According to DIN VDE 0701:2000, it is absolutely essential to measure protective conductor
current after insulation resistance measurement has been performed. We recommend the
use of an equivalent leakage current measurement.
➭Connection is the same as shown for the measurement of insulation resistance (see
chapter 5.4, page 16).
➭Set the measuring range selector switch to the “20 mA” position.
➭Switch all DUT functions on and make sure, for example, that all contacts for tempera-
ture sensitive switches and the like are closed.
➭Read the measured value in “mA” from the LCD.
According to DIN VDE 0701:2000, the displayed value for current between components
to which voltage is applied during operation and exposed metal parts may not exceed
3.5 mA, or 1 mA/kW for devices with heating power of greater than 3.5 kW.
Device Type Limit Value Minimum Display Value
Safety class I devices 1 MW1.105 MW(2 MW range), 1.15 MW(20 MW range)
Safety class II devices
with heating elements
0.3 MW0.335 MW (2 MW range), 0.38 MW(20 MW range)
Safety class II devices 2.0 MW2.25 MW
Safety class III devices
and battery powered devices
1000 W/V or 250 kW

GOSSEN-METRAWATT 17
5.6 Measuring Contact Current
Contact current measurement can be performed instead of insulation resistance measure-
ment for class II devices, or for class I devices with exposed conductive parts which are not
connected to the protective conductor.
➭Connect the device under test to the mains outlet.
Attention!
!
The protective conductor test must first be performed and passed.
➭Connect the cable with the test probe to the “2 mA” jack.
➭Start up the device under test.
➭Contact all exposed metal parts at the device under test with the test probe.
➭Read the residual current value in mA from the display. This value may not exceed
0.5 mA.
Measurements must be performed with the mains plug poled in both directions. The larger of
the two measured values applies.
Note!
+
If no device under test is connected, random characters appear at the digital display
which may not be construed as measured values.
5.7 Measuring Residual Current (METRATESTERâ5/5-F only)
Residual current (differential current) is measured between phase conductor L and neutral
conductor N at the device under test. This measurement may not be performed until the
protective conductor test has been passed (see chapter 5.3, page 15).
➭Connect the device under test to the mains outlet.
➭Set the measuring range selector switch to the IDiff position.
➭Start up the device under test.
➭Read the residual current value in mA from the display. According to
DIN VDE 0701:2000, the displayed current value may not exceed 3.5 mA, or 1 mA/kW
for devices with heating power equal to or greater than 3.5 kW.
Measurements must be performed with the mains plug poled in both directions. The larger of
the two measured values applies.
Note!
+
If no device under test is connected, random characters appear at the digital display
which may not be construed as measured values.
Note!
+
If the METRATESTERâ5/5-F is integrated into a 3-phase ammeter, residual current is
measured as the sum of instantaneous current in conductors L1, L2, L3 and N.

18 GOSSEN-METRAWATT
6 Testing Devices per DIN VDE 0702:1995
6.1 General
The following periodic tests are required according to DIN VDE 0702:
• Protective conductor resistance measurement
• Insulation resistance measurement
• Equivalent leakage current
• Contact current measurement
• Residual current measurement (with METRATESTERâ5/5-F only)
Note!
+
If any doubts exist concerning the performance of an insulation resistance
measurement, a differential current measurement can be performed in its place.
For example, this may be the case with electronic devices and data processing
equipment, or safety class I devices if it is assured that all components which are
charged with line voltage are covered by this measurement.
This measurement may only be performed after the protective conductor at the DUT
has been tested.
The device under test must be plugged into the mains outlet at the
METRATESTERâ5/5-F test instrument for measurement of residual current.
6.2 Measuring Protective Conductor Resistance
The measurement of protective conductor resistance is of course not possible for devices
which are not equipped with a protective conductor (e.g. safety class II and III devices).
➭Connect the device under test as described in chapter 4.4, page 11.
➭Set the measuring range selector switch to the “20 W” position.
➭Read the measured value in “W” from the LCD.
➭Move the cable at the DUT during the measurement, section by section over its entire
length, in order to locate interruptions.
Protective conductor resistance may not exceed the following values:
Maximum Allowable Protective Conductor Resistance Values Depending upon Cable Length
The table is also valid for cable reels and extension cables. The following applies to longer
cable lengths: additional 0.1 Wper additional 7.50 m cable length, no maximum length limit,
independent of conductor cross-section.
Attention!
!
The alligator clip (3) must make good contact with the housing of the device under
test!
The connector cable must be moved during measurement, section by section over
its entire length – for permanently installed devices only in so far as the cable is ac-
cessible during repair, modification or testing. If the resistance value fluctuates during
this manual test which is essential for continuity testing, it must be assumed that the
protective conductor is damaged, or that one of its connection points is defective.
Defects of this type must be corrected before any further tests are performed.
Length to [m] 5 12. 5 20 27.5 35 42.5 50 more than 50
Max. resistance [W] 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

GOSSEN-METRAWATT 19
6.3 Measuring Insulation Resistance
This measurement may only be performed if the device under test has successfully completed protec-
tive conductor resistance testing.This measurement may not be performed if all-pole electrically
actuated switches are included in the device under test.
➭Connect the device under test as described in chapter 4.4, page 11.
Make sure that the jack (10) is connected to exposed conductive parts at the DUT for safety
class II and III devices.
➭Set the measuring range selector switch (5) to the “2 MW” range (METRATESTERâ4
only), or the “20 MW” range.
➭Switch all DUT functions on and make sure, for example, that all contacts for tempera-
ture sensitive switches and the like are closed.
➭Read the measured value in “MW” from the LCD (11).
Insulation resistance may not fall short of the following values:
The following limit values for insulation resistance may not be fallen short of:
1) Equivalent leakage current measurement must be performed if the applicable limit value is fallen short of.
Attention!
!
If a value of 0.5 MWis fallen short of for safety class I devices with heating elements,
equivalent leakage current measurement must be performed and passed in accor-
dance with chapter 6.4, page 20.
Each exposed conductive part must be contacted with the test probe connected to
the jack (10), and insulation resistance must be measured for safety class II and III
devices, and battery powered devices.
No insulation resistance measurement is required for safety class III devices, or for
battery powered devices which fulfill both of the following conditions:
– Nominal power £20 VA
– Nominal voltage £42 V.
Batteries must be disconnected during the performance of measurements at battery
powered devices.
Device Type Limit Value Minimum Display Value
Safety class I devices 0.5 MW(2 MWrange) 0.555 MW(2 MWrange), 0.60 MW(20 MWrange)
Safety class I devices
with heating elements
0.5 MW 1) 0.555 MW(2 MWrange), 0.60 MW(20 MWrange)
Safety class II devices 2.0 MW(20 MWrange) 2.25 MW
Safety class III devices
or battery powered devices
1000 W/V or 250 kW

20 GOSSEN-METRAWATT
6.4 Measuring Equivalent Leakage Current
According to DIN VDE 0702:1995, equivalent leakage current must be measured for safety class I
devices:
– for which interference suppression capacitors have been installed or replaced during the
coarse of repair or modification.
– which are equipped with heating elements and for which an insulation resistance of less
than 0.5 MWhas been measured (chapter 6.3, page 19).
➭Connection of the DUT is the same as for insulation resistance measurement (see chap-
ter 5.4, page 16).
➭Set the measuring range selector switch to the “20 mA” position.
➭Switch all DUT functions on and make sure, for example, that all contacts for tempera-
ture sensitive switches and the like are closed.
➭Read the measured value in “mA” from the LCD.
According to DIN VDE 0702, the displayed value for current between components to
which voltage is applied during operation and exposed metal parts may not exceed
7 mA, or 15 mA for devices with heating power of greater than or equal to 6 kW.
6.5 Measuring Contact Current
Contact current measurement can be performed instead of insulation resistance measure-
ment for class II devices, or for class I devices with exposed conductive parts which are not
connected to the protective conductor.
➭Connect the device under test to the mains outlet.
Attention!
!
The protective conductor test must first be performed and passed.
➭Connect the cable with the test probe to the “2 mA” jack.
➭Start up the device under test.
➭Contact all exposed metal parts at the device under test with the test probe.
➭Read the residual current value in mA from the display. This value may not exceed
0.5 mA.
Measurements must be performed with the mains plug poled in both directions. The larger of
the two measured values applies.
Note!
+
If no device under test is connected, random characters appear at the digital display
which may not be construed as measured values.
6.6 Measuring Residual Current (METRATESTERâ5/5-F only)
Residual current (differential current) is measured between phase conductor L and neutral
conductor N at the device under test. This measurement may not be performed until the pro-
tective conductor test has been passed (see chapter 5.3, page 15).
➭Connect the device under test to the mains outlet.
➭Set the measuring range selector switch to the IDiff position.
➭Start up the device under test.
➭Read the residual current value in mA from the display. According to
DIN VDE 0701:2000, the displayed current value may not exceed 3.5 mA.
Measurements must be performed with the mains plug poled in both directions. The larger of
the two measured values applies.