Benning IT 115 User guide
Installation Tester
BENNING IT 115
Operating Manual
Manufacturer:
BENNING Elektrotechnik und Elektronik GmbH & Co. KG
Münsterstraße 135 - 137
D - 46397 Bocholt
Phone: +49 (0) 2871 - 93 - 0 • Fax: +49 (0) 2871 - 93 - 429
www.benning.de • duspol@benning.de
This symbol on your device ensures that the device complies with the requirements laid
down by the EU (European Union) with regard to safety and electromagnetic compatibility
of devices.
© 2014 BENNING
This document must not be reproduced or used in any other form without the express written
consent of BENNING.
IDNo. 20 752 415 Part no.: 10141960.00
BENNING IT 115 Content
Table of contents
1 Preface...............................................................................................................................5
2 Safety and operating instructions ................................................................................... 6
2.1
Warnings.....................................................................................................................6
2.2
Batteries / storage batteries and charger...................................................................10
2.3
Standards applied .....................................................................................................12
3 Device description..........................................................................................................13
3.1
Front panel................................................................................................................ 13
3.2
Connection panel ......................................................................................................14
3.3
Rear panel ................................................................................................................15
3.4
Carrying the installation tester...................................................................................16
3.4.1
Attachment of the carrying strap........................................................................17
3.5
Scope of delivery and optional accessories...............................................................18
3.5.1
Standard scope of delivery ................................................................................18
3.5.2
Optional accessories .........................................................................................18
4 Operating the BENNING IT 115 installation tester ........................................................19
4.1
Indications and acoustic warning signals...................................................................19
4.1.1
Connection monitor ...........................................................................................19
4.1.2
Battery indication............................................................................................... 19
4.1.3
Warnings and messages ...................................................................................19
4.1.4
Evaluation field ..................................................................................................20
4.1.5
Acoustic warning signals ...................................................................................20
4.1.6
Help menu ("HELP" key) ...................................................................................21
4.1.7
Background lighting and contrast.......................................................................21
4.2
Function selector switch............................................................................................22
4.3
"SETTINGS" mode....................................................................................................23
4.3.1
Language ..........................................................................................................23
4.3.2
RCD testing....................................................................................................... 23
4.3.3
Isc factor (scaling factor)....................................................................................25
4.3.4
Commander ON/OFF ........................................................................................25
4.3.5
Initial settings.....................................................................................................26
5 Measurements.................................................................................................................28
5.1
TRMS voltage, frequency and phase sequence ........................................................ 28
5.2
Insulating resistance..................................................................................................30
5.3
Low-impedance resistance / continuity test ............................................................... 32
5.3.1
Low-impedance resistance with a testing current of 200 mA ............................. 32
5.3.2
Continuity test with a testing current of 7 mA.....................................................33
5.3.3
Compensation (null balance) of the test cable resistance .................................. 34
5.4
RCD testing...............................................................................................................36
5.4.1
Contact voltage (Uc)..........................................................................................37
5.4.2
Tripping time (RCDt)..........................................................................................38
5.4.3
Tripping current (RCD I) ....................................................................................38
5.4.4
Automatic test....................................................................................................39
5.5
Loop impedance and prospective short-circuit current............................................... 41
5.6
Line impedance and prospective short-circuit current / voltage drop .........................43
5.6.1
Line impedance and prospective short-circuit current........................................44
5.6.2
Voltage drop...................................................................................................... 45
5.7
Earthing resistance ...................................................................................................47
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BENNING IT 115 Content
5.8
Testing the protective conductor connection (PE) ..................................................... 49
6 Maintenance ....................................................................................................................51
6.1
Fuse replacement .....................................................................................................51
6.2
Cleaning.................................................................................................................... 51
6.3
Periodic calibration....................................................................................................51
6.4
Service...................................................................................................................... 52
7 Technical data.................................................................................................................53
7.1
Insulating resistance..................................................................................................53
7.2
Low-impedance resistance / continuity test ............................................................... 54
7.2.1
Low-impedance resistance R LOW ...................................................................54
7.2.2
Continuity test....................................................................................................54
7.3
Residual current protection devices (RCDs)..............................................................55
7.3.1
General data......................................................................................................55
7.3.2
Contact voltage (Uc)..........................................................................................55
7.3.3
Tripping time (RCD t).........................................................................................56
7.3.4
Tripping current (RCD I) ....................................................................................56
7.4
Loop impedance and prospective short-circuit current............................................... 57
7.4.1
Zs function (for systems without RCD)...............................................................57
7.4.2
Zsrcd function (for systems with RCD)...............................................................57
7.5
Line impedance and prospective short-circuit current / voltage drop .........................58
7.6
Earthing resistance ...................................................................................................58
7.7
TRMS voltage, frequency and phase sequence ........................................................ 59
7.7.1
TRMS voltage (AC/DC) .....................................................................................59
7.7.2
Voltage of the connection monitor .....................................................................59
7.7.3
Frequency .........................................................................................................59
7.7.4
Phase sequence (rotary field)............................................................................59
7.8
General data .............................................................................................................60
Appendix A
Appendix B
Appendix C
C.1
C.2
C.3
C.4
Batteries...................................................................................................................65
Description of the optional "Commanders"..........................................................66
LED indications of the "Commanders"..................................................................67
Fuse table – Prospective short-circuit current.......................................... 61
Standard and optional accessories for specific measuring functions .... 64
"Commander" test probe, "Commander" test plug...................................65
Safety warnings ................................................................................................65
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BENNING IT 115 Preface
1 Preface
BENNING would like to congratulate you on purchasing this BENNING IT 115 installation tester
and its accessories. The BENNING IT 115 installation tester is a multifunctional tester for testing
electrical installations in compliance with IEC 60364-6 (DIN VDE 0100-600) and EN 50110
(DIN VDE 0105-100).
The device is intended for the following measurements and tests:
TRUE RMS voltage, frequency and rotary field (phase sequence)
low-impedance resistance, continuity test
insulating resistance
residual current protection devices (RCD)
loop impedance without RCD tripping
line impedance and voltage drop
earthing resistance by means of optional earthing kit
The graphic display with background lighting allows easy reading of measuring results,
indications, measuring parameters and messages. Two "PASS" / "FAIL" indications (red / green
LEDs) are located next to the LC display.
The BENNING IT 115 installation tester is equipped with all accessories necessary for
comfortable testing. It is kept in a padded carrying case together with all accessories.
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BENNING IT 115 Safety and operating instructions
2 Safety and operating instructions
The following symbols are used both in the operating manual and on the installation tester:
Attention! Danger! Please observe the operating manual!
Warning of dangerous voltage!
Protection class II
Earth (voltage to earth)
2.1 Warnings
In order to ensure a high degree of operational safety during the tests and measurements and
to avoid damaging of the BENNING IT 115 installation tester, the general warnings listed in the
following must be adhered to.
Warnings – general information:
In case the installation tester is not used according to this operating manual, the
protection provided by the installation tester might be impaired!
Please read this operating manual carefully, because otherwise the use of the
installation tester might involve dangers for the user, the installation tester or the
test object!
Never use the installation tester or the corresponding accessories, if they exhibit
visible damages!
Absolutely observe all general safety instructions in order to avoid the risk of an
electric shock when handling dangerous voltages!
If a fuse has blown, please follow the instructions of this operating manual to
replace it! Please use fuses complying with the specifications only!
Never use the installation tester in AC supply systems with voltages higher than
550 V AC.
Any service, repair or adjustments of the installation tester and of the
corresponding accessories must be carried out by authorized qualified personnel
only!
Please use standard or optional BENNING accessories only which are available
from your authorized specialty retailer!
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BENNING IT 115 Safety and operating instructions
Please observe that the measuring category of some accessories might be lower
than that of the installation tester. Test probes and "Commander" test probes are
provided with detachable protective caps. If these attachable protective caps are
removed, the measuring category will be reduced to CAT II. Please check the
markings of the accessories!
without attachable protective cap, 18 mm tip: CAT II 1000 V to earth
with attachable protective cap, 4 mm tip: CAT II 1000 V / CAT III 600 V /
CAT IV 300 V to earth
The installation tester comes with rechargeable NiMH storage batteries. The
storage batteries must be replaced only as shown on the label at the battery
compartment cover or as described in this operating manual and must be
replaced with storage batteries of the same type only. Do not use standard
alkaline batteries while the charger is connected, because otherwise these
batteries might explode!
Dangerous voltages are applied to the interior of the device! Disconnect all test
cables, disconnect the charger and switch off the installation tester before
opening the cover of the battery / fuse compartment.
Absolutely observe all common safety instructions in order to avoid the risk of an
electric shock when working on electrical installations!
Warnings with regard to measurements:
Insulating resistance
Measurements of the insulating resistance must be carried out only at test objects which
are free of voltage!
Never touch the test object during measurement before it is completely discharged!
Danger of life-threatening electric shocks!
If the insulating resistance is measured on capacitive test objects, discharging might
take place time-delayed! During discharge, the warning as well as the current
voltage are displayed until the voltage falls below 30 V.
Do not connect any measuring input to an external voltage higher than 550 V (AC or DC)
in order not to damage the installation tester!
Low-impedance measurement / continuity test
Low-impedance measurements / continuity tests must be carried out on discharged test
objects only!
The test result might be influenced by parallel impedances.
Testing the PE connection
If a phase voltage is detected at the PE connection, immediately stop all measurements.
Make sure that the error in the installation is eliminated before going on with the
measurements!
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BENNING IT 115 Safety and operating instructions
Remarks with regard to measurements:
General
The icon means that the selected measurement cannot be carried out due to
irregular conditions at the input terminals.
Carry out measurements of the insulating resistance, low-impedance resistance,
continuity and earthing resistance on discharged objects only!
The "PASS" / "FAIL" indication is activated, if a limiting value has been defined. Choose
appropriate limiting values for evaluating the measuring results.
If only two of the three test cables are connected to the electrical installation to be
tested, only the voltage value between those two test cables shall be valid.
Insulating resistance
The three-wire test cable, the test cable with shock-proof plug as well as the
"Commander" test probe can be used for measuring the insulating resistance.
If a voltage higher than 30 V (AC or DC) is measured at the testing terminals, the
measurement of the insulating resistance cannot be carried out.
The installation tester automatically discharges test objects after the measurement is
finished.
Double-click the "TEST" key to carry out a continuous measurement.
Low-impedance measurement / continuity test
If a voltage higher than 10 V (AC or DC) is measured at the testing terminals, the lowimpedance measurement / continuity test cannot be carried out.
Before carrying out a low-impedance measurement / continuity test, compensate the test
cable resistance (if necessary).
Earthing resistance
If a voltage higher than 30 V (AC or DC) is measured at the testing terminals, the
measurement of the earthing resistance cannot be carried out.
If an interference voltage higher than 5 V is detected at the testing terminals H and E or
S, the warning symbol " ” will be displayed indicating that the measuring result might
have been influenced!
Residual current protection devices (RCDs)
The parameters set for a measuring function will be taken over for other RCD
measurements as well!
Contact voltage measurement usually does not involve any tripping of the residual
current protection devices (RCD). However, the tripping threshold might be exceeded
due to leakage currents via the protective conductor (PE) or via capacitive connections
between the conductors L and PE.
Compared to the loop impedance RL (contact voltage subresult), the measurement of
the loop impedance Zs
rcd
needs more time, but offers a considerably higher degree of
accuracy.
The tripping time and tripping current measurement is only carried out, if the contact
voltage at nominal differential current is lower than the preset limiting value of the
contact voltage.
The automatic test sequence (RCD AUTO function) is stopped, if the tripping time is
outside the admissible value.
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BENNING IT 115 Safety and operating instructions
Loop impedance
The lower limiting value of the prospective short-circuit current depends on the fuse type,
on the fuse current rating and tripping time as well as on the I
The stated accuracy of the parameters tested shall only apply, if the mains voltage is
SC
scaling factor.
stable during measurement.
Loop impedance measurements (Zs) involve tripping of residual current protection
devices (RCDs).
Loop impedance measurements (Zs
rcd
) normally do not involve tripping of the residual
current protection device (RCD). However, the tripping threshold might be exceeded due
to leakage currents flowing to the protective conductor (PE) or via the capacitive
connection between the conductors L and PE.
Line impedance / voltage drop
During phase-to-phase measurements of the line impedance ZI(L-L) with the test cables
PE and N being connected, a warning of dangerous PE voltages is displayed. However,
the measurement will be carried out.
The stated accuracy of the parameters tested shall only apply, if the mains voltage is
stable during measurement.
Depending on the connection voltage detected, the test terminals L and N are inverted
automatically.
Testing the protective conductor connection (PE)
The PE connection can be tested only in switch positions "FI/RCD", "ZS(L-PE)" and
"ZI(L-N/L)"!
For correct measurement of the PE connection, the "TEST" key must be touched for
several seconds.
Make sure not to stand on an insulated floor, because otherwise the test result might be
incorrect!
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BENNING IT 115 Safety and operating instructions
+
-
2.2 Batteries / storage batteries and charger
The installation tester can be operated with six alkaline batteries (type AA) or with rechargeable
NiMH batteries (storage batteries). The specified operating time refers to storage batteries with
a nominal capacity of 2100mAh. The batteries' state of charge is permanently displayed in the
lower right part of the LC display. If the battery voltage is too low, this will be displayed as
shown in figure 2.1. This indication is shown several seconds before the tester switches off.
Figure 2.1: Indication of discharged batteries
The rechargeable NiMH storage batteries will be charged automatically as soon as the charger
is connected with the charging jack of the installation tester. The polarity of the charging jack will
be displayed as shown in figure 2.2. An integrated protective circuit controls the charging
process and ensures an optimum battery lifetime.
Figure 2.2: Polarity of the charging jack
Symbol:
General warnings:
If the installation tester is connected to an installation, a dangerous voltage might be
applied to the battery compartment! Disconnect all test cables / accessories from the
installation tester and switch the installation tester off before replacing the batteries /
storage batteries and before opening the cover of the battery / fuse compartment!
Please make sure that the batteries / storage batteries are inserted correctly, because
otherwise the installation tester cannot be operated and the storage batteries will
discharge.
Do not recharge alkaline batteries!
Use only the charger included in the delivery!
Notes:
The charger inside the installation tester is a cell pack charger. This means that the
storage batteries are connected in series during charging. For this reason, the storage
batteries must be equivalent (same state of charge, same condition, same type and
same age).
If the installation tester is not used for a longer period of time, remove all storage
batteries from the battery compartment.
Use alkaline batteries or rechargeable NiMH batteries of size AA only! It is
recommended to use storage batteries with a minimum capacity of 2100 mAh.
Indication of the storage battery
charging process
Figure 2.3: Charging in progress
- 10 -
BENNING IT 115 Safety and operating instructions
Unpredictable chemical processes might occur during the charging of storage batteries
that have not been used for a longer period of time (more than 6 months). In this case, it
is recommended to repeat the charging / discharging cycle at least 2 to 4 times.
If no improvement is achieved after several charging / discharging cycles, every storage
battery should be tested individually (by comparing the storage battery voltages, testing
by means of a cell charger etc.). It is very likely that only some of the storage batteries
have lost capacity. If one storage battery differs from the other ones, this might affect the
correct functioning of the entire storage battery block!
The effects described above must not be confused with the normal battery capacity
decrease over time. All rechargeable batteries (storage batteries) lose some of their
battery capacity when being charged / discharged several times. This information is
provided in the technical data specified by the battery manufacturer.
- 11 -
BENNING IT 115 Safety and operating instructions
2.3 Standards applied
The BENNING IT 115 installation tester is manufactured and tested in compliance with the
following regulations:
Electromagnetic compatibility (EMC)
EN 61326-1 Electrical equipment for measurement, control and laboratory use
– EMC requirements
Class B (hand-held equipment in controlled EM environments)
Safety (LVD)
EN 61010-1 Safety requirements for electrical equipment for measurement, control and
laboratory use – Part 1: General requirements
EN 61010-2-030 Safety requirements for electrical equipment for measurement, control and
laboratory use – Part 2-030: Particular requirements for testing and
measuring circuits
EN 61010-031 Safety requirements for electrical equipment for measurement, control and
laboratory use – Part 031: Safety requirements for hand-held probe
assemblies for electrical measurement and test
EN 61010-2-032 Safety requirements for electrical equipment for measurement, control and
laboratory use – Part 2-032: Particular requirements for hand-held and
hand-manipulated current sensors for electrical test and measurement
Functionality
EN 61557 Electrical safety in low-voltage distribution systems up to 1000 VAC and
1500 VDC – Equipment for testing, measuring or monitoring of protective
measures
Part 1: General requirements
Part 2: Insulation resistance
Part 3: Loop impedance
Part 4: Resistance of earth connection and equipotential bonding
Reference standards for electrical installations and components
EN 61008 Residual current operated circuit-breakers without integral overcurrent
EN 61009 Residual current operated circuit-breakers with integral overcurrent
EN 60364-4-41 Low-voltage electrical installations – Part 4-41: Protection for safety –
BS 7671 IEE Wiring Regulations (17th edition)
AS / NZS 3017 Electrical installations – Verification guidelines
Note on EN and IEC standards:
This operating manual contains references to European standards. All standards of the
series EN 6XXXX (e.g. EN 61010) correspond to the respective IEC standards with the
same number (e.g. IEC 61010). They only differ in the modified parts due to the
European harmonization procedures.
Part 5: Resistance to earth
Part 6: Effectiveness of residual current devices (RCD) in TT, TN and IT
systems
Part 7: Phase sequence
Part 10: Combined measuring equipment for testing, measuring or
monitoring of protective measures
protection for household and similar uses (RCCBs)
protection for household and similar uses (RCBOs)
Protection against electric shock
- 12 -
BENNING IT 115 Device description
3 Device description
3.1 Front panel
Caption:
LCD
1
UP
2
DOWN
3
TEST
4
ESC
5
TAB
6
Backlight,
7
Contrast
ON / OFF
8
HELP
9
Function selector switch
10
CAL
11
Green / red LED
12
Figure 3.1: Front panel
Matrix display with 128 x 64 pixels and background lighting
Modifies selected parameters
Start of measurement
PE contact electrode for protective conductor connection
Back / cancel
Selects parameters in the measuring function selected
Modifies background lighting and contrast
Switches the tester on or off;
automatic switch-off ("APO") after 15 minutes without
pressing a key
Help function with connection diagrams
Rotary switch for selecting the measuring functions and
"SETTINGS" mode
For calibrating the test cables in the R LOW and
CONTINUITY function
Starts the Z
voltage drop
PASS / FAIL indication of the measuring results
measurement in the sub-function ∆U
REF
- 13 -
BENNING IT 115 Device description
3.2 Connection panel
Caption:
Test connection
1
Charging jack
2
PS/2 port
3
Protective cover
4
USB port
5
Warnings!
The maximum admissible voltage between the testing terminals and earth is 550 V!
The maximum admissible voltage between the testing terminals is 550 V!
The maximum admissible short-term voltage of the external charger is 14 V!
Figure 3.2: Connection panel
Measuring inputs / outputs
For charging rechargeable NiMH storage batteries
Serial RS232 interface for service
Without function!
- 14 -
BENNING IT 115 Device description
3
3.3 Rear panel
1
2
Figure 3.3: Rear panel
Caption:
Cover of the battery / fuse compartment
1
Information label
2
Screws for the battery / fuse compartment cover
3
Figure 3.4: Battery / fuse compartment
Caption:
Fuse F1
1
Fuses F2 and F3
2
Serial number label
3
Storage batteries / batteries
4
M 315 mA / 250 V
F 4 A / 500 V (breaking capacity 50 kA)
Size AA, alkaline / rechargeable NiMH,
quantity: 6 pieces
- 15 -
BENNING IT 115 Device description
Figure 3.5: Bottom view
Caption:
Information label
1
Carrying strap openings
2
Lateral covers
3
3.4 Carrying the installation tester
The installation tester can be carried in different ways by means of the accessories included in
the standard scope of delivery.
The tester can be hung
around the operator's neck by
means of the carrying strap.
It is also possible to carry the tester in the padded carrying
case and to use it in a horizontal position. The carrying
case is provided with an aperture for passing through the
test cable.
- 16 -
BENNING IT 115 Device description
3.4.1 Attachment of the carrying strap
Please choose one of the two methods shown:
Figure 3.6: First method
Figure 3.7: Alternative method
Please check the carrying strap for safe fastening regularly.
- 17 -
BENNING IT 115 Device description
3.5 Scope of delivery and optional accessories
3.5.1 Standard scope of delivery
1 x BENNING IT 115 installation tester
1 x padded carrying case
1 x test cable with shock-proof plug
1 x universal three-wire test cable (black, blue, green)
1 x set of test probes (black, blue, green)
1 x set of alligator clips (black, blue, green)
1 x carrying strap
6 x rechargeable NiMH storage batteries of size AA
1 x charger
1 x CD-ROM with operating manual and quick reference guide in PDF format
1 x quick reference guide
1 x calibration certificate
3.5.2 Optional accessories
Earthing kit
Earthing kit, 2 earth rods, 3 test cables,
2 x L = 20 m, 1 x L = 4.5 m Item no.: 044113
"Commander" test probe
“TEST“ key for releasing the measuring process,
“PASS“/“FAIL“ indication by means of green/ red LED,
PE contact electrode for detecting the phase voltage at
the protective conductor connection PE, key for
measuring point and LCD illumination Item no. 044155
"Commander" test plug
For shock-proof socket, switchable with "TEST" keys,
with "PASS" / "FAIL" indication by means of green/red
LED, PE contact electrode for detecting the phase
voltage at the protective conductor connection (PE).
Item no.: 044149
CEE measuring adapter
16 A, 5-pin, for measuring the voltage and phase
sequence (rotary field) at 16 A CEE sockets.
Item no.: 044148
Measuring line (40 m)
40 m measuring line with rewinder and wrist strap, for
measuring protective conductor connections.
Item no.: 044039
- 18 -
BENNING IT 115 Management of measured values
4 Operating the BENNING IT 115 installation tester
4.1 Indications and acoustic warning signals
4.1.1 Connection monitor
The connection monitor shows the voltages applied to the testing terminals as well as
information on active testing terminals in the AC mains.
The voltage applied is displayed together with the testing terminal indication.
All three testing terminals L, N and PE are used for the selected
measurement.
The voltage applied is displayed together with the testing terminal indication.
The testing terminals L and N are used for the selected measurement.
The testing terminals L and PE are active testing terminals. The testing
terminal N should be connected as well to show a correct input voltage.
The polarity of the testing voltage applied (R LOW, R ISO) is displayed at the
output terminals L and N.
4.1.2 Battery indication
The battery indication shows the current state of charge of the storage battery as well as
whether an external charger is connected.
Battery capacity indication
Low state of charge.
The storage battery's state of charge is too low to ensure correct measuring
results. Replace the batteries or recharge the storage batteries.
Charging in progress (with the charger being connected)
4.1.3 Warnings and messages
The following warnings and messages are displayed:
Warning! High voltage is applied to the testing terminals.
Warning! Dangerous voltage at the PE connection! Immediately stop the
measuring process and eliminate the fault / the connection problem before
continuing with the measurement!
The conditions at the input terminals allow starting the measurement. Please
observe further warnings and messages!
The conditions at the input terminals do not allow starting the measurement.
Please observe further warnings and messages!
Measurement is in progress. Please observe warnings that might be
displayed!
The tester is overheated. Measurements are interrupted until the internal
temperature has dropped below the admissible limiting value.
A high interference voltage has been detected during measurement. This
might result in incorrect measuring results.
- 19 -
BENNING IT 115 Device description
L and N have been interchanged.
RCD has been tripped during measurement (in RCD functions).
Portable RCD (PRCD) has been selected (only for documentation purposes).
The test cable resistance for low-impedance measurement / continuity test
has not been compensated.
The test cable resistance for low-impedance measurement / continuity test
has been compensated.
High earthing resistance of the measuring probes. This might result in
incorrect measuring results.
The measuring signal is outside the measuring range This might result in
incorrect measuring results.
Fuse F1 is defective.
4.1.4 Evaluation field
The measuring result is within the preset limiting values (green LED).
The measuring result is outside the preset limiting values (red LED).
Measurement has been aborted. Please observe the warnings and messages
displayed.
4.1.5 Acoustic warning signals
Continuous
sound
Warning! Dangerous voltage at the PE connection!
- 20 -
BENNING IT 115 Device description
4.1.6 Help menu ("HELP" key)
HELP
Opens the help menu.
Help menus are available for all measuring functions. The help menu contains graphic
connection diagrams showing how to connect the installation tester to the electrical installation.
After having selected the desired measuring function, press the "HELP" key to view the
corresponding help menu.
Keys used in the help menu
UP / DOWN
Selects the next / previous connection diagram
ESC / HELP /
function selector switch
Use these keys to exit the help menu.
Figure 4.1: Connection diagrams of the help menu
4.1.7 Background lighting and contrast
Use the key for background lighting and contrast to make the following settings:
Briefly press the key
Press and hold the key for
1 second
Press and hold the key for
2 seconds
Activates the background lighting for approx. 10 seconds
Switches the background lighting on permanently until the tester
switches off or the key is pressed again
Allows to set the LCD contrast
Keys used for contrast setting
UP
DOWN
TEST
ESC
Increases the contrast
Reduces the contrast
Applies the adjusted contrast
Exits the settings without any changes
Figure 4.2: LCD contrast setting
- 21 -
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