Gossen MetraWatt Profitest Mpro Mxtra User manual

Operating Instructions
PROFITEST MPRO MXTRA
Test Instruments for DIN VDE 0100 3-349-647-03
2/10.11

2GMC-I Messtechnik GmbH
456
8
91011
7
MEM:Key for memory functions
HELP: Access context sensitive help
IN: Trip RCD
RLO: Measure ROFFSET
ON/START: Switch instrument on,
start/stop measurement
ESC: Return to submenu
13
31
Softkeys
Control Panel
Test Instrument and Adapter
16 1715
14
Fixed Function Keys
2
19 20 21
22
12
!
RS 232
2
• Parameter selection
• Specify limit value
• Entry functions
• Memory functions
LEDs and connection icons  section 18
9
10
Sockets for Current Clamp Sensor, Probe and
PRO-AB Leakage Current Adapter
15
16
17
Interfaces, Charger Jack
* Refer to section 2.1 on page 5 regarding usage of
the test probes.
*
**
18

GMC-I Messtechnik GmbH 3
Key Overview of Device Settings and Measuring Functions
Test Instrument and Adapter
1 Control panel with keys and
display panel with detent for
ideal viewing angle
2 Eyelets for attaching the
shoulder strap
3 Rotary selector switch
4 Measuring adapter (2-pole)
5 Plug insert (country specific)
6 Test plug (with retainer ring)
7 Alligator clip (plug-on)
8 Test probes
9tkey ON/START *
10 I key IN/compens./ZOFFSET
11 Contact surfaces for finger
contact
12 Test plug holder
13 Fuses
14 Holder for test probes (8)
Connections for Current Clamp,
Probe and PRO-AB Adapter
15 Current clamp connection 1
16 Current clamp connection 2
17 Probe connection
Interfaces, Charger Jack
18 Bluetooth®
19 USB slave for PC connection
20 RS 232 for connecting barcode
scanner or RFID reader
21 Jack for Z502P charger
Attention! Make sure that no
batteries are inserted before
connecting the charger.
22 Battery Compartment Lid
(compartment for batteries
and replacement fuses)
Please refer to section 17 for
explanations regarding control
and display elements.
Battery level indicator
Meas. function
Meas. in progress / Memory occupancy
Measured
Parameter
Display Panel
PE
Save value
Battery full
Battery OK
Battery weak
Battery (nearly)
Battery level indicator
BAT
BAT
BAT
BAT
Memory occupancy display
MEM Memory half full
MEM Memory full > transfer data to PC
Connection Test – Mains Connection Test (section 18)
N
PE
LN
PE
L)(
Connection OK L and N reversed
N
PE
L N
PE
L
x
N
PE
L N
PE
L
xx
RUN READY
Connection test section 18
depleted: U < 8 V
L
PE
N
x
L
PE
N
These operating instructions describe a tester with
software version SW-VERSION (SW1) 01.03.00.
* Can only be switched on with the key on the instrument
Bluetooth
®
active:
quantities
stopped
Switch
Setting,
Descr. on
Picto-
graph
Device Settings
Measuring Functions
SETUP
Page 8
Brightness, contrast, time/date, Bluetooth®
Language (D, GB, P), profiles (ETC, PS3, PC.doc)
Default settings
< Test: LED, LCD, acoustic signal
Rotary switch balancing,
battery test >
Measurements with line voltage
U
Page 16
Single-phase measurement UL-N-PE
UL-N Voltage between L and N
UL-PE Voltage between L and PE
UN-PE Voltage between N and PE
US-PE Voltage between probe and PE
fFrequency
3-phase measurement U3~
UL3-L1 Voltage between L3 and L1
UL1-L2 Voltage between L1 and L2
UL2-L3 Voltage between L2 and L3
fFrequency
Phase sequence
Appears for all meas.
shown below:
U / UNLine voltage / nominal line voltage
f / fNLine frequency / nominal line frequency
IN
Page 18
UIN Contact voltage
ta Tripping time
RE Earth resistance
IF
Page 20
UIN Contact voltage
IResidual current
RE Earth resistance
ZL-PE
Page 26
ZL-PE Loop impedance
IK Short-circuit current
ZL-N
Page 28
ZL-N Line impedance
IK Short-circuit current
RE
Page 30
2-pole measurement (ground loop) RE(L-PE)
3-pole measurement (2-pole with probe)
Selective measurement with current clamp
sensor
UE Earth electrode voltage (probe/clamp)
Measurements at voltage-free objects
RE
Page 37
3-pole measurement
4-pole measurement
Selective measurement with current clamp
sensor
2-clamp measurement (earth loop res.)
Soil resistivity E
RLO
Page 47
RLO Low-resistance with polarity reversal
RLO+, RLO– Low-resistance, single-pole
Roffset Offset resistance
RISO
Page 44
RISO Insulation resistance
RE(ISO) Earth leakage resistance
U Voltage at the test probes
UISO Test voltage
Ramp: triggering/breakdown voltage
SENSOR
Page 49
IL/AMP Residual or leakage current
T/RF Temperature/humidity (in preparation)
EXTRA
Page 52
U Voltage drop measurement
ZST Standing surface insulation impedance
kWh test Meter start-up test, earth contact plug
IL
Leakage current meas. with Z502S adapter
IMD Check insulation monitoring device
Ures Residual voltage test
ta + I Intelligent ramp
RCM RCM (residual current monitor)
AUTO Automatic test sequences

4GMC-I Messtechnik GmbH
Table of Contents Page Page
1 Scope of delivery: ............................................................ 5
2 Applications ..................................................................... 5
2.1 Using Cable Sets and Test Probes ...............................................5
2.2 Overview of Features Included
with PROFITEST MASTER Device Variants ...................................6
3 Safety Features and Precautions ..................................... 6
4 Initial Start-Up .................................................................. 7
4.1 Installing or Replacing Batteries .................................................7
4.2 Switching the Instrument On/Off .................................................7
4.3 Battery Test .................................................................................7
4.4 Charging the Batteries in the Tester ...........................................7
4.5 Device Settings ...........................................................................8
5 General Notes ................................................................ 12
5.1 Connecting the Instrument ........................................................12
5.2 Automatic Settings, Monitoring and Shut-Off ...........................12
5.3 Measurement Value Display and Memory .................................13
5.4 Testing Earthing Contact Sockets for Correct Connection ........13
5.5 Help Function ............................................................................13
5.6 Setting Parameters or Limit Values using RCD Measurement
as an Example ...........................................................................14
5.7 Freely Selectable Parameter Settings or Limit Values ..............15
5.8 2-Pole Measurement with Fast or Semiautomatic Polarity
Reversal ....................................................................................15
6 Measuring Voltage and Frequency ................................ 16
6.1 Single-Phase Measurement ......................................................16
6.1.1 Voltage Between L and N (UL-N), L and PE (UL-PE) a nd N and PE (UN-PE)
with Country-Specific Plug Insert, e.g. SCHUKO .............................16
6.1.2 Voltage between L – PE, N – PE and L – L
with 2-Pole Adapter Connection ...................................................16
6.2 3-Phase Measurement (line-to-line voltage) and Phase Sequence 17
7 Testing RCDs .......................................................................17
7.1 Measuring Contact Voltage (with reference to nominal residual
current) with 1/3 Nominal Residual Current and Tripping Test with
Nominal Residual Current .........................................................18
7.2
Special Testing for Systems and RCCBs .........................................20
7.2.1 Testing Systems and RCCBs with Rising Residual Current (AC)
for Type A, AC and B RCDs ..........................................................20
7.2.2 Testing Systems and RCCBs
with Rising Residual Current (AC) for Type B RCDs .........................20
7.2.3 Testing RCCBS with 5 IN ........................................................21
7.2.4 Testing of RCCBs which are Suited for
Pulsating DC Residual Current ......................................................21
7.3 Testing for Special RCDs ...........................................................22
7.3.1 System, Type RCD-S Selective RCCBs ..........................................22
7.3.2 PRCDs with Non-Linear Type PRCD-K Elements ............................22
7.3.3 SRCD, PRCD-S (SCHUKOMAT, SIDOS or comparable) ....................23
7.3.4 Type G or R RCCB .......................................................................24
7.4 Testing Residual Current Circuit Breakers in TN-S Systems .....25
7.5 Testing of RCD Protection in IT Systems with High Cable
Capacitance (e.g. in Norway) ....................................................25
8 Testing of Breaking Requirements
Overcurrent Protective Devices,
Measurement of Loop Impedance and Determination of
Short-Circuit Current (functions ZL-PE and IK) ............... 26
8.1 Measurements with Suppression of RCD Tripping ....................27
8.1.1 Measurement with Positive Half-Waves (PROFITEST MXTRA only) ..27
8.2 Evaluation of Measured Values .................................................28
9 Measuring Line Impedance (ZL-N function) ................... 28
10 Earthing Resistance Measurement (REfunction) ........... 30
10.1 Earthing Resistance Measurement – Mains Operated ..............31
10.2 Earthing Resistance Measurement – Battery Powered ............31
10.3 Earthing Resistance, Mains Powered – 2-Pole Measurement with 2-
Pole Adapter or Country-Specific Plug (Schuko) without Probe ... 32
10.4 Earthing Resistance Measurement, Mains Powered –
3-Pole Measurement: 2-Pole Adapter with Probe ....................33
10.5 Earthing Resistance Measurement, Mains Powered –
Measurement of Earth Electrode Voltage (UEfunction) ...........34
10.6 Earthing Resistance Measurement, Mains Powered –
Selective Earthing Resistance Measurement with Current
Clamp Sensor as Accessory ......................................................35
10.7 Earthing Resistance Measurement, Battery Operated – 3-Pole 37
10.8 Earthing Resistance Measurement, Battery Operated – 4-Pole 38
10.9 Earthing Resistance Measurement, Battery Operated –
Selective (4-pole) with Current Clamp Sensor and PRO-RE
Measuring Adapter as Accessory ..............................................40
10.10 Earthing Resistance Measurement, Battery Powered –
Ground Loop Measurement (with current clamp sensor and
transformer, plus PRO-RE/2 measuring adapter as accessory) 41
10.11 Earthing Resistance Measurement, Battery Powered
– Measurement of Soil Resistivity E ...........................................42
11 Measuring Insulation Resistance ........................................ 44
11.1 General ......................................................................................44
11.2 Special Case: Earth Leakage Resistance (REISO) .....................46
12 Measuring Low-Value Resistance up to 100 Ohm
(protective conductor and equipotential bonding conductor) ...47
13 Measurement with Accessory Sensors .......................... 49
13.1 Current Measurement with Current Clamp Sensor ...................49
14 Special Function – EXTRA Switch Position ...............................50
14.1 Voltage Drop Measurement (at ZLN) – U Function .................51
14.2 Measuring the Impedance of Insulating Floors and Walls
(standing surface insulation impedance) – ZST Function .........52
14.3 Testing Meter Start-Up with Earthing Contact Plug
– kWh Function .........................................................................53
14.4 Leakage Current Measurement with PRO-AB Leakage Current
Adapter as Accessory– IL Function (PROFITEST MXTRA only) ...54
14.5 Testing of Insulation Monitoring Devices – IMD Function .........55
14.6
Residual Voltage Test – Ures Function ( PROFITEST MXTRA only) ...... 57
14.7 Intelligent Ramp – ta+ID Function ( PROFITEST MXTRA only) ........ 58
14.7.1 Applications ................................................................................58
14.8 Testing Residual Current Monitors
– RCM Function (PROFITEST MXTRA only) .................................59
15 Automatic Test Sequences – AUTO Function ................. 60
16 Database ........................................................................ 62
16.1 Creating Distributor Structures, General ...................................62
16.2 Transferring Distributor Structures ...........................................62
16.3 Creating a Distributor Structure in the Test Instrument ............62
16.3.1 Creating Structures (example for electrical circuit) .........................63
16.3.2 Searching for Structural Elements .................................................64
16.4 Saving Data and Generating Reports ........................................65
16.4.1 Use of Barcode Scanners and RFID Readers ..................................66
17 Operating and Display Elements .................................... 67
18 LED Indications, Mains Connections and Potential
Differences ..................................................................... 69

GMC-I Messtechnik GmbH 5
19 Characteristic Values .....................................................76
20 Maintenance ...................................................................79
20.1 Firmware Revision and Calibration Information ....................... 79
20.2 Rechargeable Battery Operation, and Charging ....................... 79
20.2.1 Charging Procedure with Accessory Charger for MPRO MXTRA
(Z502R) ...................................................................................... 79
20.3 Fuses ........................................................................................ 79
20.4 Housing ..................................................................................... 79
21 Appendix .........................................................................80
21.1 Table 1 ..................................................................................... 80
21.2 Table 2 ..................................................................................... 80
21.3 Table 3 ..................................................................................... 80
21.4 Table 4 ..................................................................................... 80
21.5 Table 5 ..................................................................................... 81
21.6 Table 6 ...................................................................................... 81
21.7 At which values should/must an RCD actually be tripped?
Requirements for Residual Current Devices (RCDs) ................. 82
21.8 Testing Electrical Machines per DIN EN 60204 –
Applications, Limit Values ......................................................... 83
21.9 Periodic Testing per BGV A3 – Limit Values for
Electrical Systems and Operating Equipment ........................... 84
21.10 List of Abbreviations and their Meanings ................................. 85
21.11 Keyword Index .......................................................................... 86
21.12 Bibliography .............................................................................. 87
21.12.1 Internet Addresses for Additional Information ............................... 87
22 Repair and Replacement Parts Service
Calibration Center and Rental Instrument Service ......... 88
23 Recalibration ..................................................................88
24 Product Support .............................................................88
1 Scope of delivery:
1Testinstrument
1 Earthing contact plug insert (country-specific)
1 2-pole measuring adapter and 1 cable for expansion into a
3-pole adapter (PRO-A3-II)
2 Alligator clips
1 Shoulder strap
1 Compact Master Battery Pack (Z502H)
1 Charger for M PRO M XTRA (Z502R)
1 Condensed operating instructions
1 Operating instructions (on CD ROM)
1 DKD calibration certificate
1 ETC user software for PC (see page 7)
1USBcable
2 Applications
The PROFITEST MASTER measuring and test instrument allows for
quick and efficient testing of protective measures in accordance
with DIN VDE 0100, part 600:2008 (Erection of low-voltage installa-
tions; tests – initial tests), as well as
ÖVE-EN 1 (Austria), NIV/NIN
SEV 1000 (Switzerland) and other country-specific regulations.
The device is equipped with a microprocessor and complies with
IEC 61557/EN 61557/VDE 0413 regulations:
Part 1: General requirements
Part 2: Insulation resistance
Part 3: Loop resistance
Part 4:
Resistance of earth connection and equipotential bonding
Part 5: Earth resistance
Part 6: Effectiveness of residual current devices (RCD) in TT, TN
and IT systems
Part 7: Phase sequence
Part 10:Electrical safety in low-voltage systems up to 1000 V AC
and 1500 V DC – Equipment for testing, measuring or
monitoring of protective measures
Part 11:Effectiveness of type A and type B residual current moni-
tors (RCMs) in TT, TN and IT systems
It’s especially well suited for:
•Systemsetup
• Initial start-up
• Periodic testing
• Troubleshooting in electrical systems
All of the values required for approval reports (e.g. for ZVEH) can
be measured with this instrument.
All acquired data can be archived, in addition to the measurement
and test reports which can be printed out at a PC. This is of spe-
cial significance where product liability is concerned.
The applications range of the PROFITEST MASTER covers all alternat-
ing and three-phase current systems with nominal voltages of
230 V / 400 V (300 V / 500 V) and nominal frequencies of 162/3/
50 / 60 / 200 / 400 Hz.
The following can be measured and tested with the
PROFITEST MASTER:
• Voltage / frequency / phase sequence
• Loop impedance / line impedance
• Residual current devices (RCDs)
• Insulation monitoring devices (IMDs)
• Residual current monitoring devices (RCMs)
• Earthing resistance / earth electrode potential
• Standing surface insulation resistance / insulation resistance
• Earth leakage resistance
• Low-value resistance (potential equalization)
• Leakage currents with current transformer clamp
• Residual voltage
• Voltage drop
• Leakage current with leakage current adapter
• Meter start-up
• Cable length
Refer to section 21.8 regarding testing of electrical machines in
accordance with DIN EN 60204.
Refer to section 21.9 regarding periodic testing in accordance
with BGV A3.
2.1 Using Cable Sets and Test Probes
• 2 or 3-pole measuring adapter included
• 2-pole measuring adapter with 10 m cable as optional acces-
sory: PRO-RLO II (Z501P)
• KS24 cable set as optional accessory (GTZ3201000R0001)
Measurements per DIN EN 61010-031 may only be performed in
environments in accordance with measuring categories III and IV
with the safety cap attached to the test probe at the end of the
measurement cable.
In order to establish contact inside 4 mm jacks, the safety caps
have to be removed by prying open the snap fastener with a
pointed object (e.g. the other test probe).

6GMC-I Messtechnik GmbH
2.2 Overview of Features Included
with PROFITEST MASTER Device Variants
* The so-called live measurement is only advisable if there is no bias current within
the system.
3 Safety Features and Precautions
This instrument fulfills all requirements of applicable European and
national EC directives. We confirm this with the CE mark. The rel-
evant declaration of conformity can be obtained from GMC-I
Messtechnik GmbH.
The electronic measuring and test instrument is manufactured
and tested in accordance with safety regulations IEC 61010-1/
EN 61010-1/VDE 0411-1.
Safety of the operator, as well as that of the instrument, is only
assured when it is used for its intended purpose.
Read the operating instructions thoroughly and carefully before using
your instrument. Follow all instructions contained therein. Make sure
that the operating instructions are available to all users of the instru-
ment.
Tests may only be executed by a qualified electrician.
Grip and hold the test plug and test probes securely when they
have been inserted, for example, into a socket. Danger of injury
exists if tugging at the coil cord occurs, which may cause the test
plug or test probes to snap back.
The measuring and test instrument may not be placed into ser-
vice:
• If external damage is apparent
• If connector cable or measuring adapters are damaged
•Iftheinstrumentnolonger functions flawlessly
• After a long period of storage under unfavorable conditions
(e.g. humidity, dust, temperature)
Exclusion of Liability
When testing systems with RCCBs, the latter may switch off. This may
occur even though the test does not normally provide for it. Leak-
age currents may be present which, in combination with the test
current of the test instrument, exceed the shutdown threshold
value of the RCCB. PCs which are operated in proximity to such
RCCB systems may switch off as a consequence. This may result
in inadvertent loss of data. Before conducting tests, precautions
should therefore be taken to ensure that all data and programs
are adequately saved, and the computer should be switched off if
necessary. The manufacturer of the test instrument assumes no
liability for any direct or indirect damage to equipment, comput-
ers, peripheral equipment or data bases when performing tests.
Meaning of Symbols on the Instrument
Warning concerning a point of danger
(Attention, observe documentation!)
Protection class II device
Charging socket for extra-low direct voltage
(charger for
M PRO M XTRA (Z502R))
Attention!
Only rechargeable batteries may be inserted when the char-
ger is connected.
This device may not be disposed of with the trash. Fur-
ther information regarding the WEEE mark can be
accessed on the Internet at www.gossen-
metrawatt.com by entering the search term “WEEE”.
EC mark of conformity
Data Backup
We advise you to regularly transmit your stored data to a PC in
order to prevent potential loss of data in the test instrument.
We assume no responsibility for any data loss.
We recommend the following PC software programs for data
processing and management:
•ETC
• E-Befund Manager (Austria)
•Protokollmanager
• PS3 (documentation, management, report generation and
monitoring of deadlines)
• PC.doc-WORD/EXCEL (report and list generation)
• PC.doc-ACCESS (test data management)
PROFITEST ... MBASE MPRO MTECH MXTRA
Article Number M520M M520N M520O M520P
Testing of residual current devices (RCDs)
UBmeasurement without tripping RCD
3333
Tripping time measurement 3333
Measurement of tripping current IF 3333
Selective, SRCDs, PRCDs, type G/R 3333
AC/DC sensitive RCDs, type B, type B+ —— 33
Testing of IMDs ——— 3
Testing of RCMs ——— 3
Testing for N-PE reversal 3333
Measurement of loop impedance ZL-PE / ZL-N
Fuse table for systems without RCDs 3333
Without tripping the RCD, fuse table — — 33
With 15 mA test current* without tripping the
RCD
3333
Earthing resistance RE(mains operation)
I-U measuring method (2/3-wire measuring
method via measuring adapter: 2-wire/2-wire +
probe)
3333
Earthing resistance RE(battery operation)
3 or 4-wire measurement via PRO-RE adapter —
3 — 3
Soil resistivity 
E
(battery operation)
(4-wire measurement via PRO-RE adapter) —
3 — 3
Selective earthing resistance R
E
(mains opera-
tion)
with 2-pole adapter, probe, earth electrode
and current clamp sensor (3-wire measuring
method)
3333
Selective earthing resistance R
E
(battery operation)
with probe, earth electrode and current clamp
sensor (4-wire measuring method via PRO-RE
adapter and current clamp sensor)
—
3 — 3
Earth loop resistance R
ELOOP
(battery operation)
with 2 clamps (current clamp sensor direct
and current clamp transformer via PRO-RE/2
adapter)
—
3 — 3
Measurement of equipotential bonding RLO,
automatic polarity reversal
3333
Insulation resistance RISO ,
variable or rising test voltage (ramp)
3333
Voltage UL-N / UL-PE / UN-PE / f 3333
Special measurements
Leakage current (with clamp) IL, IAMP
3333
Phase sequence 3333
Earth leakage resistance RE(ISO) 3333
Voltage drop 3333
Standing-surface insulation ZST 3333
Meter start-up 3333
Leakage current with PRO-AB adapter ——— 3
Residual voltage test ——— 3
Intelligent ramp ——— 3
Features
Selectable user interface language
3333
Memory (database for up to 50,000 objects) 3333
Automatic test sequence function — 3 — 3
RS 232 port for RFID/barcode scanner 3333
USB port for data transmission 3333
Interface for Bluetooth® ——— 3
ETC user software for PC 3333
Measuring category: CAT III 600 V / CAT IV
300 V
3333
DKD calibration 3333
!

GMC-I Messtechnik GmbH 7
4 Initial Start-Up
4.1 Installing or Replacing the Battery Pack
Attention!
!
Before opening the battery compartment, disconnect the
instrument from the measuring circuit (mains) at all poles!
Note
See also section 20.2 on page 79 concerning charging
the Kompkt Akku Pack Master (Z502H) and the battery
charger M PRO M XTRA (Z502R).
Use Kompakt Akku Pack Master (Z502H), if possible, which is either
included in the standard equipment or available as an accessory, with
heat-sealed battery cells. Do not use any battery holders which can
be filled with individual batteries. This ensures that always a com-
plete set of batteries is replaced and all rechargeable batteries are
inserted with correct polarity in order to prevent leakage from the
batteries.
Only use commercially available battery packs if you charge them exter-
nally. The quality of these sets cannot be verified and this may, in
unfavourable cases, lead to heating and deformation (during the
charging in the device).
Dispose the battery packs or the individual rechargeable batteries
in an environmentally sound fashion when their service life has
nearly expired (approx. 80% charging capacity).
➭Loosen the slotted screw for the battery compartment lid on
the back and remove the lid.
➭Remove the exhausted battery pack or the battery holder.
Attention!
!
When Using a Battery Holder:
It is imperative that you pay attention to the correct po-
larity when inserting the rechargeable batteries. If a bat-
tery has been inserted with incorrect polarity, it is not
detected by the instrument and may lead to battery leak-
age.
Individual rechargeable batteries may only be charged
externally.
➭Slide the new battery pack/filled battery holder into the battery
compartment. The holder can only be inserted to its proper
position.
➭Replace the lid and re-tighten the screw.
4.2 Switching the Instrument On/Off
The test instrument is switched on by pressing the ON/START key.
The menu which corresponds to the momentary selector switch
position is displayed.
The instrument can be switched off manually by simultaneously
pressing the MEM and HELP keys.
After the period of time selected in the SETUP menus has elapsed,
the instrument is switched off automatically (see “Device Set-
tings”, section 4.5.
4.3 Battery Test
If battery voltage has fallen below the permissible
lower limit, the pictograph shown at the right
appears. “Low Batt!!!” is also displayed along with a battery sym-
bol. The instrument does not function if the batteries have been
depleted excessively, and no display appears.
4.4 Charging the Battery Pack in the Tester
Attention!
!
Use only the M PRO M XTRA charger (Z502R) (available as an
accessory) to charge the Kompakt Akku-Pack Master
(Z502H) which has already been inserted into the test in-
strument.
Make sure that the following conditions have been fulfilled be-
fore connecting the charger to the charging socket:
– Kompakt Akku-Pack Master (Z502H) has been
installed, no commercially available battery packs,
no individual rechargeable batteries, no batteries
– The test instrument has been disconnected from the
measuring circuit at all poles
– The instrument must remain off during charging.
Refer to section 20.2.1 with regard to charging the battery pack
which has been inserted into the tester.
If the batteries or the battery pack have not been used or
recharged for a lengthy period of time (> 1 month), thus resulting
in excessive depletion:
Observe the charging sequence (indicated by LEDs at the char-
ger) and initiate a second charging sequence if necessary (dis-
connect the charger from the mains and from the test instrument
to this end, and then reconnect it).
Please note that the system clock stops in this case and must be
set to the correct time after the instrument has been restarted.
BAT

8GMC-I Messtechnik GmbH
4.5 Device Settings
SETUP
LED and LCD test menu
Rotary switch balancing
Brightness/contrast menu
Software revision level
Calibration date
Display: date / time
Display: automatic shutdown
Display: automatic shutdown
of display illumination after 15 s.
of the tester after 60 s. Time, language, profiles
1
2
3
4
and battery test menu
0b
0a
0
Return to main menu
MAINS LED: test green
MAINS LED: test red
UL/RL LED: test red
RCD-FI LED: test red
Cell test
Inverse cell test
Hide all pixels
Show all pixels
Acoustic signal test
1
Return to main menu
Increase brightness
Decrease brightness
Bluetooth®submenu 
Brightness/contrast submenu 
Set time 
Profiles for
Default settings 
distribution structures 
User interface
language 
33a
3b
3c
3d
3e
Set date 
On-time
for display illumination / tester
0b
Return to submenu
0a
Display Illumination On-time
Bluetooth®and Brightness Plus Contrast Settings Time, On-Time and Default Settings
Menu Selection for Operating Parameters
LED tests LCD and Acoustic Signal Tests
Test Instrument On-Time
Select inspector
(change via ETC)
3g
3f
5
No automatic shut-down,
continuously on

GMC-I Messtechnik GmbH 9
LED and LCD test menu
Rotary switch balancing
Brightness/contrast menu
Software revision level
Calibration date
Display: date / time
Display: automatic shutdown
Display: automatic shutdown
of display illumination after 15 s.
of the tester after 60 s. Time, language, profiles
1
2
3
4
and battery test menu
0b
0a
0
Return to main menu
Bluetooth®submenu 
Brightness/contrast submenu 
Set time 
Profiles for
Default settings 
distribution structures 
User interface
language 
33a
3b
3c
3d
3e
Set date 
On-time
for display illumination / tester
Set time
Menu Selection for Operating Parameters
Bluetooth®and Brightness Plus Contrast Settings Set Time, Language, Profiles, Acoustic Signal
Set date
Select time/date
Increase
Increase
hours
Activate
settings
minutes
3a
Increase
seconds
Return to submenu
Decrease
Decrease
hours
minutes
Decrease
seconds
Select time/date
Increase
Increase
day
Activate
settings
month
3b
Increase
year
Return to submenu
Decrease
Decrease
day
month
Decrease
year
Enter and select a new inspector
(change/deletion via ETC only)
3g
3f
5

10 GMC-I Messtechnik GmbH
Significance of Individual Parameters
Test Instrument On-Time
The period of time after which the test instrument is automatically
shut off can be selected here. This selection has a considerable
influence on the service life and the charging status of the batter-
ies.
On-Time for LCD Illumination
The period of time after which LCD illumination is automatically
shut off can be selected here. This selection has a considerable
influence on the service life and the charging status of the batter-
ies.
Submenu: Rotary Switch Balancing
Proceed as follows in order to precision adjust the rotary switch:
1 Press the TESTS Rotary Switch / Battery Test softkey in order to
access the rotary switch balancing menu.
2 Then press the softkey with the rotary switch symbol.
3 Turn the rotary switch clockwise to the next respective measuring
function (IDN first after SETUP).
4 Press the softkey which is assigned to the rotary switch at the LCD.
After pressing this softkey, the display is switched to the next mea-
suring function. Labeling in the LCD image must correspond to the
actual position of the rotary switch.
The
level bar in the LCD image of the rotary switch should be
located in the middle of the black field, and is supplemented at
the right-hand side with a number within a range of -1 to 101.
This value should be between 45 and 55. In the case of -1 or 101,
the position of rotary knob does not coincide with the measuring
function selected at the LCD.
5 If the displayed value is not within this range, readjust the
position by pressing the readjust softkey. A brief acoustic
signal acknowledges readjustment.
Note
If labeling in the LCD image of the rotary switch does not
correspond with its actual position, a continuous acous-
tic signal is generated as a warning when the readjust
softkey is pressed.
6 Return to point 2 and continue. Repeat this procedure until all
rotary switch functions have been tested, and if necessary
readjusted.
➭Press ESC in order to return to the main menu.
Submenu: Battery Level Query
If battery voltage has dropped to 8.0 V or less, the UL/RL LED lights
up red and an acoustic signal is generated as well.
Note
Measuring Sequence
If battery voltage drops to below 8.0 V
during the course of a measuring
sequence, this is indicated by means of
a pop-up window only. Measured val-
ues are invalid. The measurement results cannot be
saved to memory.
➭Press ESC in order to return to the main menu.
Attention!
!
Data are lost when the language
or the profile is changed, or if the
instrument is reset to default val-
ues!
Back up your measurement
data to a PC before pressing
the respective key.
The prompt window shown at
the right asks you to confirm
deletion.
User Interface Language (CULTURE)
➭Select the desired country setup with the appropriate country
code.
Profiles for Distributor Structures (PROFILES)
The profiles are laid out in
a tree structure. The tree
structure for the utilized
PC evaluation program
may differ from that of the
PROFITEST MASTER. For this
reason, the
PROFITEST MASTER pro-
vides the user with the
opportunity of adapting
this structure.
Selecting a suitable profile
determines which object
combinations are made
possible. For example,
this makes it possible to
create a distributor which is subordinate to another, or to save a
measurement to a given building.
➭Select the PC evaluation program you intend to use.
If you have not selected a suitable PC evalua-
tion program and, for example, if measured
value storage to the selected location within the
structure is not possible, the pop-up window
shown at the right appears.
Default Settings (GOME SETTING)
The test instrument is returned to its original default settings when
this key is activated.
Adjusting Brightness and Contrast
0a
0b
2
2
3c
3d
3e
3f
Return to main menu
Increase brightness
Decrease brightness
Increase contrast
Decrease contrast

GMC-I Messtechnik GmbH 11
Switching Bluetooth®On/Off (PROFITEST MXTRA only)
If your PC is equipped with a Bluetooth®interface, wireless com-
munication is possible between the PROFITEST MXTRA and ETC
user software for the transfer of data and test structures.
One-time only authentication of the respective PC with the
PROFITEST MXTRA is a prerequisite for wireless data exchange. The
function selector switch must be in the SETUP position to this
end. The correct Bluetooth®COM port must also be selected in
ETC before each data transmission sequence.
Note
Activate the Bluetooth®interface at the PROFITEST MXTRA
during data transmission only. Interface power consump-
tion reduces battery service life when activated continu-
ously.
If several PROFITEST MXTRA instruments are within range during
authentication, the respective name should be changed in order
to rule out the possibility of a mix-up. Blanks may not be used.
The default pin code, namely “0000”, can be changed, but this is
unnecessary as a rule. As shown in figure 3, the MAC address of
the PROFITEST MXTRA is displayed in the footer as hardware infor-
mation.
Render your PROFITEST MXTRA visible prior to authentication, and
subsequently invisible for security reasons.
Steps Required for Authentication
Make sure that the PROFITEST MXTRA is within range of the PC
(roughly 5 to 8 meters). Activate Bluetooth®at the PROFITEST MXTRA
(see figure 1) and at your PC.
The function selector switch must be in the SETUP position to this end.
Make sure that the PROFITEST MXTRA (see figure 3) and your PC
are visible for other Bluetooth®devices:
In the case of the PROFITEST MXTRA, the word “visible” must be dis-
played underneath the eye symbol.
Use your Bluetooth®PC driver software to add a new Bluetooth®
device. In most cases, this is accomplished with the help of the
“Add new connection” or “Add Bluetooth®device” button.
The following steps may vary, depending on which Bluetooth®PC
driver software is used. Basically, a PIN code must be entered at
the PC. The default setting for the PIN code is “0000”, and is dis-
played in the main Bluetooth®menu (see figure 1) at the
PROFITEST MXTRA. Subsequently, or previously, an authentication
message must be acknowledged at the PROFITEST MXTRA (see fig-
ure 4).
If authentication has been successful, a corresponding message
appears at the PROFITEST MXTRA. Furthermore, the authenticated
PC is displayed in the “Trusted Devices” menu at the
PROFITEST MXTRA (see figure 2).
The PROFITEST MXTRA should now also be listed as a device in
your Bluetooth®PC driver software. Further information is also pro-
vided here regarding the utilized COM port. With the help of your
Bluetooth®PC driver software, you’ll need to find out which COM
port is used for the Bluetooth®connection. This port is frequently
displayed after authentication, but if this is not the case, this infor-
mation provided by your Bluetooth®PC driver software.
ETC includes a function for automatically ascertaining the utilized COM port
after successful authentication has been completed (see screenshot below).
If the PROFITEST MXTRA is within range of your PC (5 to 8 meters),
wireless data exchange can now be initiated with the help of ETC
by clicking Bluetooth®in the “Extras” menu. The number of the cor-
rect COM port (e.g. COM40) must be entered to ETC when data
exchange is started (see screenshot below).
Alternatively, the COM port number can be selected automatically by clicking
the “Find Bluetooth Device” item in the menu.
3g
When Bluetooth®is
active (= ON), the
Bluetooth®icon
appears in the header
instead of BAT, and an
interface icon appears
instead of MEM.
A closed interface icon indicates
an active Bluetooth connection
with data transmission.
Figure 1 Figure 2
Figure 3 Figure 4

12 GMC-I Messtechnik GmbH
Firmware Revision and Calibration Information (example)
➭Press any key in order to return to the main menu.
Firmware Update with the MASTER Updater
The layout used for the entire range of PROFITEST Master test
instruments makes it possible to adapt instrument software to the
latest standards and regulations. Beyond this, suggestions from
customers result in continuous improvement of the test instru-
ment software, as well as new functions.
In order to assure that you can take advantage of all of these ben-
efits without delay, the MASTER Updater allows you to quickly
and completely update your test instrument software on-site.
The user interface can be set to either English, German or Italian.
Note
As a registered user, you’re entitled to download the
MASTER Updater and the current firmware version free of
charge from the myGMC page.
Entering and Selecting a New Inspector
See also section 5.7 on page 15 regarding the entry of a text.
5 General Notes
5.1 Connecting the Instrument
For systems with earthing contact sockets, connect the instru-
ment to the mains with the test plug to which the appropriate,
country-specific plug insert is attached. Voltage between phase
conductor L and the PE protective conductor may not exceed
253 V!
Poling at the socket need not be taken into consideration. The
instrument detects the positions of phase conductor L and neu-
tral conductor N and automatically reverses polarity if necessary.
This does not apply to the following measurements:
– Voltage measurement in switch position U
– Insulation resistance measurement
– Low-value resistance measurement
The positions of phase conductor L and neutral conductor N are
identified on the plug insert.
If measurement is to be performed at three-phase outlets, at dis-
tribution cabinets or at permanent connections, the measuring
adapter must be attached to the test plug (see also table 16.1).
Connection is established with the test probes: one at PE or N
and the other at L.
The 2-pole measuring adapter must be expanded to 3 poles with
the included measurement cable for the performance of phase
sequence testing.
Contact voltage (during RCCB testing) and earthing resistance
can be, and earth-electrode potential, standing surface insulation
resistance and probe voltage must be measured with a probe.
The probe is connected to the probe connector socket with a
4 mm contact protected plug.
5.2 Automatic Settings, Monitoring and Shut-Off
The test instrument automatically selects all operating conditions
which it is capable of determining itself. It tests line voltage and
frequency. If these lie within their valid nominal ranges, they
appear at the display panel. If they are not within nominal ranges,
prevailing voltage (U) and frequency (f) are displayed instead of UN
and fN.
Contact voltage which is induced by test current is monitored for
each measuring sequence. If contact voltage exceeds the limit
value of > 25 V or > 50 V, measurement is immediately inter-
rupted. The UL/RLLED lights up red.
If battery voltage falls below the allowable limit value the instrument
cannot be switched on, or it is immediately switched off.
The measurement is interrupted automatically, or the measuring
sequence is blocked (except for voltage measuring ranges and
phase sequence testing) in the event of:
• Impermissible line voltages (< 60 V, > 253 V / > 330 V /
> 440 V or > 550 V) for measurements which require line volt-
age
• Interference voltage during insulation resistance or low resis-
tance measurements
• Overheating at the instrument.
As a rule, excessive temperatures only occur after approxi-
mately 50 measurement sequences at intervals of 5 seconds,
when the rotary selector switch is set to the ZL-PE oder ZL-N
position.
If an attempt is made to start a measuring sequence, an
appropriate message appears at the display panel.
The instrument only switches itself off automatically after comple-
tion of an automatic measuring sequence, and after the predeter-
mined on-time has expired (see sectionl 4.2). On-time is reset to
its original value as defined in the setup menu, as soon as any key
or the rotary selector switch is activated.
The instrument remains on for approximately 75 seconds in addi-
tion to the preset on-time for measurements with rising residual
current in systems with selective RCDs.
The instrument always shuts itself off automatically!
4
5

GMC-I Messtechnik GmbH 13
5.3 Measurement Value Display and Memory
The following appear at the display panel:
• Measurement values with abbreviations and units of measure
• Selected function
• Nominal voltage
• Nominal frequency
• Error messages
Measurement values for automatic measuring sequences are
stored and displayed as digital values until the next measurement
sequence is started, or until automatic shut-off occurs.
If the upper range limit is exceeded, the upper limit value is dis-
played and is preceded by the “>” symbol (greater than), which
indicates measurement value overrun.
Note
The depiction of LEDs in these operating instructions
may vary from the LEDs on the actual instrument due to
product improvements.
5.4 Testing Earthing Contact Sockets for Correct Connection
The testing of earthing contact sockets for correct connection
prior to protective measures testing is simplified by means of the
instrument’s error detection system.
The instrument indicates improper connection as follows:
•Impermissible line voltage (< 60 V or > 253 V):
The MAINS/NETZ LED blinks red and the measuring
sequence is disabled.
•Protective conductor not connected or potential to earth 25 V at f
> 45 Hz (switch position U – single-phase measurement):
If the contact surfaces are touched (finger contact)while PE is
being contacted (via the country-specific plug insert, e.g.
SCHUKO, as well as via the PE test probe at the 2-pole
adapter) PE appears (only after a test sequence has been
started). The UL/RLand RCD/FI LEDs light up red as well.
•Neutral conductor N not connected (during mains dependent
measurements):
The MAINS/NETZ LED blinks green.
•One of the two protective contacts is not connected:
This is checked automatically during testing for contact cur-
rent UIN. Poor contact resistance at one of the contacts
leads to one of the following displays, depending upon poling
of the plug:
–Display at the connection pictograph:
PE interrupted (x), or underlying protective
conductor bar interrupted with reference
to keys at the test plug
Cause: voltage measuring path interrupted
Consequence: measurement is disabled
–Display at the connection pictograph:
Overlying protective conductor bar inter-
rupted with reference to keys at the test
plug
Cause: current measuring path interrupted
Consequence: no measured value display
Note
See also “LED Indications, Mains Connections and
Potential Differences” beginning on page 69.
Attention!
!
Reversal of N and PE in a system without RCCBs cannot
be detected and is not indicated by the instrument.
In a system including an RCCB, the RCCB is tripped
during “contact voltage measurement without RCCB
tripping” (automatic ZL-N measurement), insofar as N and
PE are reversed.
5.5 Help Function
The following information can be displayed for each switch posi-
tion and basic function after it has been selected with the rotary selec-
tor switch:
• Wiring diagram
• Measuring range
• Nominal range of use and measuring uncertainty
• Nominal value
➭Press the HELP key in order to query online help:
➭If several pages of help are available for the respective mea-
suring function, the HELP key must be pressed repeatedly.
➭Press the ESC key in order to exit online help.

14 GMC-I Messtechnik GmbH
5.6 Setting Parameters or Limit Values using RCD Measurement as an Example
1 Access the submenu for setting the desired parameter.
2 Select a parameter using the orscroll key.
3 Switch to the setting menu for the selected parameter with the scroll
key.
4 Select a setting value using the orscroll key.
5 Acknowledge the setting value with the key. This value is transferred to
the setting menu.
6 The setting value is not permanently accepted for the respective measure-
ment until 3is pressed, after which the display is returned to the main
menu. You can return to the main menu by pressing ESC instead of 3,
without accepting the newly selected value.
Parameter Lock (plausibility check)
Individually selected parameter settings are checked for plausibil-
ity before transfer to the measurement window.
If you select a parameter setting which doesn’t make sense in
combination with other parameter settings which have already
been entered, it’s not accepted. The previously selected parame-
ter setting remains unchanged.
Remedy: Select another parameter setting.
12
2
3
4
4
5
6
2
4
3
5
6

GMC-I Messtechnik GmbH 15
5.7 Freely Selectable Parameter Settings or Limit Values
In addition to fixed values, other values can be freely selected
within predefined limits for certain parameters, if the symbol for
the EDIT menu (3) appears at the end of the list of setting values.
Freely Selecting a Limit Value or Nominal Voltage
1 Open the submenu for setting the desired parameter (no figure, see section
5.6).
2 Select parameter (ULor UN) using the orscroll key (no figure, see sec-
tion 5.6).
3 Select a setting value with the help of the icon and the orscroll
key.
4 Select the edit menu: Press the key with the icon.
5 Select the desired value or unit of measure with the LEFT or RIGHT scroll
key. The value or unit of measure is accepted by pressing the key. The
entire value is acknowledged by selecting 3and then pressing the key.
The new limit value or nominal value is added to the list.
Note
Observe predefined limits for the new setting value.
New, freely selected limit values or nominal values
included in the parameters list can be deleted/edited at
the PC with the help of ETC software.
5.8 2-Pole Measurement with Fast or Semiautomatic Polarity
Reversal
Fast, semiautomatic polarity reversal is possible for the following
measurements:
• Voltage U
• Loop impedance ZLP-E
• Insulation resistance, RISO
Fast Polarity Reversal at the Test Plug
The polarity parameter is set to AUTO.
Fast and convenient switching amongst all polarity variants, or
switching to the parameter settings submenu, is possible by
pressing the INkey at the instrument or the test plug.
Semiautomatic Polarity Reversal in Memory Mode
The polarity parameter is set to AUTO.
If testing is to be conducted with all polarity variants, semiauto-
matic polarity changing takes place after each measurement
when the “Save” button is pressed.
Polarity variants can be skipped by pressing the INkey at the
instrument or the test plug.
Select value / U/M.
Select value / U/M.
Accept value / U/M.
Delete characters.
3Save value (to list).
Select editable value.
Select editable value.
Select the EDIT menu.
3
4
01/10
02/10
03/10
04/10
05/10
06/10
07/10
08/10
09/10
10/10
L1-N
L2-N
L3-N
L1-L2
L2-L3
L1-L3
L1-PE
L2-PE
L3-PE
N-PE
L1-N
L2-N
L3-N
L1-L2
L2-L3
L1-L3
ZL-PE ZL-N
L1-PE
L2-PE
L3-PE
Riso/U
01/10
02/10
03/10
04/10
05/10
06/10
07/10
08/10
09/10
10/10
L1-N
L2-N
L3-N
L1-L2
L2-L3
L1-L3
L1-PE
L2-PE
L3-PE
N-PE
L1-N
L2-N
L3-N
L1-L2
L2-L3
L1-L3
ZL-PE ZL-N
L1-PE
L2-PE
L3-PE
Riso/U

16 GMC-I Messtechnik GmbH
6 Measuring Voltage and Frequency
Select Measuring Function
Switch Between Single and 3-Phase Measurement
Repeatedly press the softkey shown at the left in
order to switch back and forth between single and
3-phase measurement. The selected phase mea-
surement is displayed inversely (white on black).
6.1 Single-Phase Measurement
Connection
A probe must be used in order to measure probe voltage US-PE.
6.1.1 Voltage Between L and N (UL-N), L and PE (UL-PE)
a
nd N and PE (UN-PE) with Country-Specific Plug Insert, e.g.
SCHUKO
Repeatedly press the softkey shown at the left in
order to switch back and forth between the country-
specific plug insert, e.g. SCHUKO, and the 2-pole
adapter. The selected connection type is displayed
inversely (white on black).
6.1.2 Voltage between L – PE, N – PE and L – L
with 2-Pole Adapter Connection
Repeatedly press the softkey shown at the left in
order to switch back and forth between the country-
specific plug insert, e.g. SCHUKO, and the 2-pole
adapter. The selected connection type is displayed
inversely (white on black).
Refer to section 5.8 regarding 2-pole measurement with fast or
semiautomatic polarity reversal.
U
2
1

GMC-I Messtechnik GmbH 17
6.2 3-Phase Measurement (line-to-line voltage) and Phase
Sequence
Connection
The measuring adapter
(2-pole) is required in
order to connect the
instrument, and can be
expanded to a 3-pole
measuring adapter with
the included measure-
ment cable.
➭Press softkey U3~.
A clockwise phase
sequence is required at all 3-phase electrical outlets.
• Measurement instrument connection is usually problematic with
CEE outlets due to contact problems.
Measurements can be executed quickly and reliably without con-
tact problems with the help of the Z500A variable plug adapter
set available from GMC.
• Connection for 3-wire measurement, plug L1-L2-L3 in clockwise
direction as of PE socket
Direction of rotation is indicated by means of the following dis-
plays:
Note
See section 18 regarding all indications for the mains
connection test.
Voltage Polarity
If the installation of single-pole switches to the neutral conductor
is prohibited by the standards, voltage polarity must be tested in
order to assure that all existing single-pole switches are installed
to the phase conductors.
7 Testing RCDs
The testing of residual current devices (RCDs) includes:
• Visual inspection
•Testing
• Measurement
Use the test instrument for testing and measurement.
Measuring Method
The following must be substantiated by generating a fault current
downstream from the RCD:
• That the RCD is tripped no later than upon reaching its nomi-
nal fault current value
• That the continuously allowable contact voltage value UL
agreed upon for the respective system is not exceeded
This is achieved by means of:
• Contact voltage measurement, 10 measurements with full-
waves and extrapolation of IN
•Substantiation of tripping within 400 ms or 200 ms with IN
• Substantiation of tripping with current rising residual current:
This value must be between 50% and 100% of IN(usually
about 70%).
• No premature tripping with the test instrument, because test-
ing is begun with 30% residual current (if no bias current
occurs within the system).
Clockwise Counter-Clockwise
RCD/FI Table Type of Differential
Current
Correct RCD/RCCB
Function
Type AC Type A Type B Type B+
Alternating
current
Suddenly occurring
4444
Slowly rising
Pulsating direct
current
Suddenly occurring
444
Slowly rising
Direct current 44
IN
3
-------
IN(measurement up to 1000 ms)
ta
Ia
t

18 GMC-I Messtechnik GmbH
Test Standard
The following must be substantiated per DIN VDE 0100 part 600:
2008:
– Contact voltage occurring at nominal residual current may not
exceed the maximum allowable value for the system.
– Tripping of the RCCB must occur within 400 ms (1000 ms for
selective RCDs) at nominal residual current.
Important Notes
•ThePROFITEST MASTER allows for simple measurements at all
types of RCDs. Select RCD, SRCD, PRCD etc.
• Measurement must be executed at one point only per RCD
(RCCB) within the connected electrical circuits. Low-resis-
tance continuity must be substantiated for the protective con-
ductor at all other connections within the electrical circuit (RLO
or UB).
• The measuring instruments often display a contact voltage of
0.1 V in TN systems due to low protective conductor resis-
tance.
• Be aware of any bias currents within the system. These may
cause tripping of the RCDs during measurement of contact
voltage UB, or may result in erroneous displays for measure-
ments with rising current:
Display = IF
- Ibias_current
• Selective RCDs identified with an can be used as the sole
means of protection for automatic shutdown if they adhere to
the same shutdown conditions as non-selective RCDs (i.e.
ta< 400 ms). This can be substantiated by measuring shut-
down time.
• Type B RCDs may not be connected in series with type A
RCDs.
Note
Bias Magnetization
Only AC measurements can be performed with the 2-
pole adapter. Suppression of RCD tripping by means of
bias magnetization with direct current is only possible via
a country-specific plug insert, e.g. SCHUKO, or the 3-
pole adapter.
Measurement With or Without Probe
Measurements can be performed with or without a probe.
Measurements with probe require that the probe and reference
earth are of like potential. This means that the probe must be
positioned outside of the potential gradient area of the earth elec-
trode (RE) in the RCD safety circuit.
The distance between the earth electrode and the probe should
be at least 20 m.
The probe is connected with a 4 mm contact protected plug.
In most cases this measurement is performed without probe.
Attention!
!
The probe is part of the measuring circuit and may carry
a current of up to 3.5 mA in accordance with VDE 0413.
Testing for the absence of voltage at the probe can be performed
with the UPROBE function (see also section 6.1 on page 16).
7.1 Measuring Contact Voltage (with reference to nominal
residual current) with 1/3 Nominal Residual Current and
Tripping Test with Nominal Residual Current
Select Measuring Function
Connection
Set Parameters for IN
S
IN
Nominal residual
Type 1: RCD, SRCD, PRCD etc.
Nominal current: 6 ... 125 A
Type 2: AC , A , B/B+ *
* Type B/B+ = AC/DC sensitive
current:
10 ... 500 mA
Phase displacement: 0°/180°
X times tripping current:
Negative/positive half-wave
Negative/positive direct current
1, 2, 5 (INmax. 300 mA)
Waveform:
Connection:
without/with probe
System type:
TN/TT, IT
Contact voltage:
Time to trip:
< 25 V, < 50 V, < 65 V

GMC-I Messtechnik GmbH 19
1) Measuring Contact Current Without Tripping the RCD
Measuring Method
The instrument uses a measuring current of only 1/3 nominal
residual current for the determination of contact voltage UIN
which occurs at nominal residual current. This prevents tripping of
the RCCB.
This measuring method is especially advantageous, because
contact voltage can be measured quickly and easily at any electri-
cal outlet without tripping the RCCB.
The usual, complex measuring method involving testing for the
proper functioning of the RCD at a given point, and subsequent
substantiation that all other systems components requiring pro-
tection are reliably connected at low resistance values to the
selected measuring point via the PE conductor, is made unneces-
sary.
N-PE Reversal Test
Additional testing is conducted in order to
determine whether or not N and PE are
reversed. The pop-up window shown at
the right appears in the event of reversal.
Attention!
!
Execute a data backup before starting measurement and
switch off all consumers in order to prevent the loss of
data in data processing systems.
Start Measurement
Amongst other values, contact voltage UINand calculated earth-
ing resistance REappear at the display panel.
Note
The measured earthing resistance value REis acquired
with very little current. More accurate results can be
obtained with the selector switch in the REposition.
The DC + function can be selected here for sys-
tems with RCCBs.
Unintentional Tripping of the RCD due to Bias Current within the System
If bias currents should occur, they can be measured with the help
of a current clamp transformer as described in section 13.1 on
page 49. The RCCB may be tripped during the contact voltage
test if extremely large bias currents are present within the system,
or if a test current was selected which is too great for the RCCB.
After contact voltage has been measured, testing can be per-
formed to determine whether or not the RCCB is tripped within
the selected time limits at nominal residual current.
Unintentional Tripping of the RCD due to Leakage Current in the Measur-
ing Circuit
Measurement of contact voltage with 30% nominal residual cur-
rent does not normally trip an RCCB. However, the trip limit may
be exceeded as a result of leakage current in the measuring cir-
cuit, e.g. due to interconnected power consumers with EMC cir-
cuit, e.g. frequency converters and PCs.
2) Tripping Test after the Measurement of Contact Voltage
➭Press the I
 N
key.
The tripping test need
only be performed at
one measuring point for
each RCCB.
If the RCCB is tripped at nominal residual current,
the MAINS/NETZ LED blinks red (line voltage disconnected) and
time to trip taand earthing resistance REappear at the display
panel.
If the RCCB is not tripped at nominal residual current,
the RCD/FI LED lights up red.
Contact Voltage Too High
If contact voltage UIN, which has been measured with 1/3 nomi-
nal residual current INand extrapolated to IN, is > 50 V (> 25 V),
the UL/RLLED lights up red.
If contact voltage UINexceeds 50 V (25 V) during the measuring
sequence, safety shut-down occurs.
Note
Safety Shut-down: At up to 70 V, a safety shut-down is
tripped within 3 seconds in accordance with IEC 61010.
Contact voltages of up to 70 V are displayed. If contact voltage is
greater than 70 V, UIN> 70 V is displayed.
Limit Values for Allowable, Continuous Contact Voltage
The limit for allowable, continuous contact voltage is UL=50Vfor
alternating voltages (international agreement). Lower values have
been established for special applications (e.g. agricultural facili-
ties: UL=25V).
Attention!
!
If contact voltage is too high, or if the RCCB is not
tripped, the system must be repaired (e.g. earthing resis-
tance is too high, defective RCCB etc.)!
3-Phase Connections
For proper RCD testing at three-phase connections, the tripping
test must be conducted for each of the three phase conductors
(L1, L2 and L3).
Inductive Power Consumers
Voltage peaks may occur within the measuring circuit if inductive
consumers are shut down during an RCCB trip test. If this is the
case, the test instrument may display the following message: No
measured value (– – – ). If this message appears, switch all power
consumers off before performing the trip test. In extreme cases,
one of the fuses in the test instrument may blow, and/or the test
instrument may be damaged.

20 GMC-I Messtechnik GmbH
7.2 Special Testing for Systems and RCCBs
7.2.1 Testing Systems and RCCBs with Rising Residual Current
(AC) for Type A, AC and B RCDs
Measuring Method
The instrument generates a continuously rising residual current of
(0.3 to 1.3) INwithin the system for the testing of RCDs.
The instrument stores the contact voltage and tripping current
values which were measured at the moment tripping of the RCCB
occurred, and displays them.
One of contact voltage limit values, UL=25VorU
L=50V/65V,
can be selected for measurement with rising residual current.
Select Measuring Function
Connection
Set Parameters for IF
Start Measurement
Measuring Sequence
After the measuring sequence has been started, the test current
generated by the instrument is continuously increased starting at
0.3 times nominal residual current, until the RCCB is tripped. This
can be observed by viewing gradual filling of the triangle at I.
If contact voltage reaches the selected limit value (UL=65V,50V
or 25 V) before the RCCB is tripped, safety shut-down occurs.
The UL/RLLED lights up red.
Note
Safety Shut-down: At up to 70 V, a safety shut-down is
tripped within 3 seconds in accordance with IEC 61010.
If the RCCB is not tripped before the rising current reaches nomi-
nal residual current IN, the RCD/FI LED lights up red.
Attention!
!
If bias current is present within the system during mea-
surement, it is superimposed onto the residual current
which is generated by the instrument and influences
measured values for contact voltage and tripping cur-
rent. See also section 7.1.
Evaluation
According to DIN VDE 0100, Part 600, rising residual current
must, however, be used for measurements in the evaluation of
RCDs, and contact voltage at nominal residual current INmust
be calculated from the measured values.
The faster, more simple measuring method should thus be taken
advantage of (see sectionl 7.1).
7.2.2 Testing Systems and RCCBs
with Rising Residual Current (AC) for Type B RCDs
In accordance with VDE 0413, part 6, it must be substantiated
that, with smooth direct current, residual operating current is no
more than twice the value of rated residual current IN. A continu-
ously rising direct current, beginning with 0.2 times rated residual
current IN, must be applied to this end. If current rise is linear, ris-
ing current may not exceed twice the value of INwithin a period
of 5 seconds.
Testing with smoothed direct current must be possible in both
test current directions.
IF
Nominal residual current:
Type 1: RCD, SRCD, PRCD etc.
Nominal current: 6 ... 125 A
Type 2: AC , A , B/B+ *
* Type B/B+ = AC/DC sensitive
10 ... 500 mA
sine
Negative/positive half-wave
Waveform:
Connection:
without/with probe
System type:
TN/TT, IT
Negative/positive direct current
Contact voltage:
Tripping limit values: