Gossen MetraWatt METRATESTER 5+ User manual

Operating Instructions
3-348-580-15
29/7.18
METRATESTER 5+
Tester for DIN VDE 0701-0702

2 GMC-I Messtechnik GmbH
(1) Mains plug
(take-up spool at back of housing
for mains cable)
(2) Signal lamp PE 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 function selector switch
RSL Protective Conductor Resistance
RISO Insulation Resistance
IEA Equivalent Leakage Current
IAContact or Leakage Current
(for confirmation of absence of voltage)
IDiff Residual Current
INetz Load current at mains outlet
UNetz Mains Voltage
(6) Connector jack/terminal for testing for
contact current at conductive parts at
the DUT
(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 24)
(12) Carrying handle
(13) Error lamp
(8) (9) (10) (11) (12)
(7)
(6)(5)
(4)
(3)
(2)
(1)
(13)
(3a)

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Display
Display text subject to change without notice.
Meanings of Symbols on the Instrument
Continuous, doubled or reinforced
insulation
Warning concerning a point of danger
(attention: observe documentation!)
Indicates EC conformity
This device may not be disposed with the trash. For further details on the WEEE
marking, please refer to our website www.gossenmetrawatt.com and enter
search key ’WEEE’.
IDiff mA INetz A M
RSL
>0.3
>1.0
RISO
<0.5
<2.0
IEA >7.0
IA>0.25
>0.5
mA
mA

IDiff mA INetz AU
Netz V
Insulation
Resistance
PE
Resistance
Equivalent
Leakage Current
Leakage Current/
Contact Current
Residual
Current
Secondary
Current Indication of Limit Values
Mains
Voltage
KS 13 Accessory Cable Set
!

4 GMC-I Messtechnik GmbH
Contents Page
1 Safety Features and Precautions ..................................................................................5
2 Applications ...................................................................................................................6
3 Operating and Display Elements ...................................................................................6
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 DUT with protectiv conductor ( Safety Class I) and 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 ............................................................................................................ 12
5 Testing Devices per DIN VDE 0701-0702 ....................................................................13
5.1 General ......................................................................................................................................... 13
5.2 Visual Inspection ............................................................................................................................ 14
5.3 Measuring Protective Conductor Resistance ..................................................................................... 14
5.3.1 Special case: permanently connected instruments ...........................................................................15
5.4 Measuring Insulation Resistance ..................................................................................................... 16
5.5 Measurement of protective conductor current ................................................................................. 17
5.5.1 Measuring Equivalent Leakage Current ............................................................................................ 18
5.5.2 Measuring Residual Current ............................................................................................................ 18
5.6 Measuring Contact Current ............................................................................................................. 19
5.6.1 Measuring Equivalent Leakage Current ............................................................................................ 19
5.6.2 Measuring Residual Current ............................................................................................................ 20
5.6.3 Direct Method ................................................................................................................................ 21
6 Measuring Load Current from the Mains Outlet ..........................................................22
7 Technical Data ............................................................................................................23
8 Maintenance – Calibration ..........................................................................................26
9 Repair and Replacement Parts Service
Calibration Center and Rental Instrument Service ......................................................27
10 Product Support ..........................................................................................................28

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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 0404-1/-2: Testing and measuring equipment for checking the electric safety
of electric devices; Part 1: general requirements, and Part 2:
Testing equipment for tests after repair, change or in case of repeat tests
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 performance and evaluation of the test.
Observe the following safety precautions:
• The instrument may only be connected to electrical supply systems with 230 V/240 V
which conform to the valid safety regulations (e.g. IEC 60364, VDE 0100) and are pro-
tected with a fuse or circuit breaker with a maximum rating of 16 A.
• 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, interruptions 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 0701-702!
Opening of Equipment / Repair
The equipment may be opened only by authorized 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 personnel.
In case the equipment was opened by unauthorized personnel, no warranty regarding per-
sonal safety, measurement accuracy, conformity with applicable safety measures or any con-
sequential damage is granted by the manufacturer.
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.

6 GMC-I Messtechnik GmbH
2 Applications
The tester is intended for the testing and measurement of repaired or modified electrical
devices in accordance with DIN VDE 0701-702. These regulations require the measurement
of protective conductor resistance, insulation resistance and equivalent leakage 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.
Note!
Limit values displayed at the instrument make reference to periodic testing require-
ments 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 100 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 100 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 Function selector Switch
Measuring functions can be selected with the measuring function selector switch. Displayed
values 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.
(7) Mains Outlet
The DUT can be connected to the integrated mains outlet for the measurement of power
consumption and functions testing.
Residual current measurement is performed in this way as well.
Overcurrent protection is provided by the mains fuse or circuit breaker, see (1).

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(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 0701-0702, 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.
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.

8 GMC-I Messtechnik GmbH
3.1 Error and Limit Value Messages
The following limit values are indicated
1) Resistance between housing and mains plug in connector cables up to a length of 5 m
2) For extension cables, there is an additional resistance of 0.1 for each
additional 7.5 m, up to a maximum, however, of 1 
3) For safety class I devices with activated heating elements
(if heating power > 3 kW and RISO < 0.3 M:
leakage current measurement required)
4) Limit value per DIN VDE 0702:1995
5) This limit value applies for all-pole switches
(corresponds to a doubling of the limit value
or, respectively, a 50 % reduction of the actual measuring current)
Residual Current Limit Value Violations
The METRATESTER 5 is equipped with a selector switch independent, residual current monitoring
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.
Error Message Condition PE Signal Lamp
Protective conductor potential, at mains UB> 100 V If contact surface is contacted
Measurement
Error
Condition per
Standard
Test Instrument Indicates When Limit Values
Are Exceeded
Red Error Lamp
Continuously Lit
Limit Values are
Displayed
Continuous Acoustic
Signal (Beeper)
Protective
Conductor
Resistance
RSL >0.31) >0.3—
RSL >12) >1
Insulation
Resistance
Heating 3):
RISO <0.3M<0.5M4) 
SCI:
RISO <1.0M<2.0M—
SCII:
RISO <2.0M—<2.0M—
Equivalent
Leakage Current
IEA >3.5mA ——
>7.0mA
5) 
Leakage/Contact
Current
(Substantiation
of Absence of
Voltage)
Part 240:
IA>0.25mA >0.25mA —
IA>0.5mA >0.5mA 
Residual Current IDiff 3.5 mA —

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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 instrument may only be connected to electrical supply systems with 230 V/
240 V which conform to the valid safety regulations (e.g. IEC 60364, VDE 0100) and
are protected with a fuse or circuit breaker with a maximum 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 function selector switch, even if no DUT has been connected. Thus the pres-
ence of characters at the display indicates the presence of voltage – independent of measur-
ing function selector switch position.
The mains voltage value is indicated at the display in the “UNetz 250 V” selector switch posi-
tion. 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

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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 (2) 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 (2) 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 PROFITEST MASTER tester.
However, if the PE signal lamp (2) 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 > 100 V, i.e. voltage is present at the protective conductor or the protective con-
ductor is not connected.
Note!
Stray voltages may occur due to handling of the DUT, which cause the PE signal lamp
(2) 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!
!
Voltage at the mains protective conductor (phase conductor L at protective earth
conductor PE: incorrect wiring of mains socket ) also distorts measured values for
the following tests:
– Measurement of contact current per DIN VDE 0701-0702
– Residual current measurement
4.3 Measuring Mains Voltage
➭Set the measuring function selector switch to “UNetz 250 V”
➭Read the measured value at the LCD.
Mains voltage must lie within the allowable range of 207 to 253 V.

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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 conductor
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 DUT with protectiv conductor ( Safety Class I) and 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
RSL
IEA
RISO
Test cable, e.g. KS17-4
Switch the DUT on!
To test socket
To ex posed m e tal
parts
IEA
RISO
N
L1
PE
e.g. KS17-4
Switch the DUT on!
To housing for measurement of protective conductor resistance
SCIII
RSL
IEA
RISO
N
L1
L2
PE
L3
Switch the DUT on!
To housing for measurement of protective conductor resistance
RSL
IEA
RISO
e.g. KS17-4

12 GMC-I Messtechnik GmbH
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 7, page 23).
Line voltage can be measured by setting the measuring function selector switch to the “UNetz
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 7 “Display – Excessive Temp.”). If this display ap-
pears, nominal current of 1 mA as required by DIN VDE 0413 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 maximum ser-
vice error into consideration (under nominal
conditions of use). The indicated values corre-
spond to the required limit values
(DIN VDE 0413, part 1). Intermediate values can
be interpolated.
4.6 Residual Current Monitoring
For your safety, residual current at the DUT connected to the mains outlet is continuously
monitored by METRATESTER 5 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 M Minimum Display Value
0,25 0,33
0,3 0,38
0,5 0,60
1,0 1,15
2,0 2,25
7,0 7,75
10,0 11,05

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5 Testing Devices per DIN VDE 0701-0702
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 0701-0702, 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
Attention!
!
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
METRATESTER 5 test instrument for measurement of residual current.
Note!
An RCCB may be tripped if measurement is performed at a defective device!

14 GMC-I Messtechnik GmbH
5.2 Visual Inspection
Visual inspection is performed prior to measurements with the test instrument.
Visual inspection includes:
• damage to connector cables;
• insulation damage;
• selection and application of conductors and plugs for their intended use;
• condition of mains plug, of connection terminals and wires;
• defects of bending protection;
• defects of connector cable strain relief;
• condition of fastenings, of conductor fixings, of the fuse holder which is accessible to the
user, etc.;
• damage to the housing and protective covers;
• signs of excessive strain or improper use/handling;
• signs of inadmissible tampering or modifications;
• fouling, corrosion or aging to a degree unduly impairing the safety of the instrument;
• fouling and/or clogging of openings for cooling purposes;
• condition of air filters;
• leakproofness of containers for water, air or other agents/fluids, condition of pressure
control valves;
• operation of switches, control and/or setting equipment, etc.;
• legibility of safety labels or symbols, of rated values and position indicators.
5.3 Measuring Protective Conductor Resistance
➭In the case of instruments equipped with a protective conductor, connect the DUT as de-
scribed in the following picture.
here: dut (Safety class I) and mains plug, also see chapter 4.4, page 11.
➭Set the measuring function selector switch to the “RSL 20 ” position.
➭Read the measured value in “” 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:
To test socket
RSL
To housing for measurement of protective conductor resistance

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Maximum Allowable Protective Conductor Resistance Values Depending upon Cable Length
Under no circumstances may a value of 1 be 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.
5.3.1 Special case: permanently connected instruments
A resistance value of up to 1 measured between a suitable earthing contact and all
exposed conductive parts which might become charged with voltage in the event of an error
is allowable for permanently installed devices.
In the case of data processing systems or combinations of permanently installed individual
devices, the network should be decoupled and individual measurements should be per-
formed. If decoupling is not feasible, individual measurements may be performed at
interconnected devices.
Length to [m] 5 12. 5 20 27.5 35 42.5 50
more than 50
Max. resistance
[]
0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
To housing for measurement of protective conductor resistance
RSL
KS17-4

16 GMC-I Messtechnik GmbH
5.4 Measuring Insulation Resistance
This measurement may only be performed if the device under test has successfully completed protec-
tive conductor resistance testing. If the DUT is equipped with all-pole electrical switches, e.g.
undervoltage releases or relays, this test only covers the supply conductor. The device can-
not be switched on without being connected to the mains, consequently, it cannot be sub-
jected to an effective insulation test. For testing in conformance with VDE, it is necessary to
measure the leakage current under mains voltage.
Attention!
!
Do not touch the instrument’s terminal contacts during insulation resistance measurements!
If nothing has been connected to the terminal contacts, or if a resistive load component has
been connected for measurement, your body would be exposed to a current of approx. 1 mA
at a voltage of 500 V. The resulting electrical shock is not life endangering. However, the
noticeable shock may lead to injury (e.g. resulting from a startled reaction etc.).
Attention!
!
If measurement is performed at a capacitive object such as a long cable, it becomes
charged with up to approx. 500 V! Touching such objects is life endangering!
➭Connect the DUT as shown in the following picture
Safety Class I
Safety Class II
➭Set the measuring function selector switch to the “RISO 20 M” 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 “M” from the LCD (11).
Insulation resistance may not fall short of the following values:
Riso
To test socket
R
iso
To test socket
To ex posed meta l
parts
KS17-4

GMC-I Messtechnik GmbH 17
1) Leakage current measurement must be performed if the applicable limit value is fallen short of.
Note: „OL“ means measured value > 20 M.
Attention!
!
If a value of 0.3 Mis 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 5.6.1, page 19.
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.
Discharge of the DUT for the avoidance of electrical shocks
➭After insulation resistance measurement on capacitive objects:
Set the measuring function selector switch one position further to the left to switch posi-
tion „IEA 20 mA“, in accordance with the standard-compliant test sequence. The DUT is
automatically discharged. Contact with the device under test must be maintained to this
end.
5.5 Measurement of protective conductor current
Protective conductor current must be measured
in instruments featuring a protective conductor/
earth-contact plug.
The following methods may be used for mea-
surement:
• Measuring Equivalent Leakage Current
• Measuring Residual Current
Frequency response is taken into consideration
in accordance with the graph to the right during
leakage current measurement.
Note!
The following schematic diagrams refer to DUTs with a mains plug. See also
chapter 4.4
Device Type Limit Value
Minimum Display Value
Safety class I devices 1 M1.15 M
Safety class I devices with heating elements 0.3 M1) 0.38 M
Safety class II devices 2.0 M2.25 M
Safety class III devices and battery powered devices 1000 /V or 250 k
10 102103104105106
+20
0
–20
–40
–60
Frequency (f) in Hz
Relative Quantity (dB): 20 log
U(f)
U(f=10)

18 GMC-I Messtechnik GmbH
5.5.1 Measuring Equivalent Leakage Current
Attention!
!
Do not touch the instrument’s terminal contacts during equivalent leakage current measurements!
➭Connect the DUT as shown in the followig picture.
➭Set the measuring function selector switch to the “IEA 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 0701-0702, 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.
5.5.2 Measuring Residual Current
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 14).
➭Connect the device under test to the mains outlet..
➭Set the measuring function selector switch to the “IDiff 20 mA” position.
➭Start up the device under test.
➭Read the residual current value in mA from the display. According to
DIN VDE 0701-0702, 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 METRATESTER 5 is integrated into a 3-phase ammeter, residual current is mea-
sured as the sum of instantaneous current in conductors L1, L2, L3 and N.
IEA
To test socket
I
Diff
To test socket

GMC-I Messtechnik GmbH 19
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.
• Measuring Equivalent Leakage Current
• Measuring Residual Current
•DirectMethod
Frequency response is taken into
consideration in accordance with the graph
to the right during leakage current measure-
ment.
Note!
Please note that the current in the protective conductor is also measured both in the
case of equivalent leakage current and in the case of differential current measure-
ment.
Note!
The following schematic diagrams refer to DUTs with a mains plug. See also
chapter 4.4
5.6.1 Measuring Equivalent Leakage Current
Attention!
!
Do not touch the instrument’s terminal contacts during equivalent leakage current measurements!
➭Connect the DUT as shown in the following picture.
➭Connect the cable with the test probe to the “SL” jack.
➭Set the measuring function selector switch to the “IEA 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.
➭Contact all exposed metal parts at the device under test with the test probe.
➭Read the measured value in “mA” from the LCD.
This value may not exceed 0.5 mA
10 102103104105106
+20
0
–20
–40
–60
Frequency (f) in Hz
Relative Quantity (dB): 20 log
U(f)
U(f=10)
IEA
To test socket
To exposed metal
parts
KS17-4

20 GMC-I Messtechnik GmbH
5.6.2 Measuring Residual Current
Attention!
!
The protective conductor test must first be performed and passed.
➭Connect the DUT as shown in the followig picture..
➭Connect the cable with the test probe to the “2 mA” jack.
➭Set the measuring function selector switch to the “IDiff 20 mA” position.
➭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.
IDiff
To exposed metal
parts
To the mains outlet
KS17-4