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Testboy
TV 450 / TV 455
Instruction manual
Version 1.0
Distributor:
Manufacturer:
Testboy GmbH
Elektrotechnische Spezialfabrik
Beim Alten Flugplatz 3
D - 49377 Vechta
Tel: 0049 (0)4441 / 89112-10
Fax: 0049 (0)4441 / 84536
www.testboy.de
info@testboy.de
Mark on your equipment certifies that this equipment meets the requirements of the EU
(European Union) concerning safety and electromagnetic compatibility regulations
© 2012 TESTBOY
No part of this publication may be reproduced or utilized in any form or by any means
without permission in writing from TESTBOY.
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TV 450/455 Table of contents
Table of contents
1 Preface ....................................................................................................................6
2 Safety and operational considerations.................................................................7
2.1 Warnings and notes ..........................................................................................7
2.2 Battery and charging .......................................................................................10
2.2.1 New battery cells or cells unused for a longer period...............................11
2.3 Standards applied ...........................................................................................12
3 Instrument description.........................................................................................13
3.1 Front panel ......................................................................................................13
3.2 Connector panel ..............................................................................................15
3.3 Back side.........................................................................................................16
3.4 Display organization ........................................................................................17
3.4.1 Terminal voltage monitor..........................................................................17
3.4.2 Battery indication......................................................................................17
3.4.3 Message field ...........................................................................................17
3.4.4 Result field ...............................................................................................18
3.4.5 Sound warnings .......................................................................................18
3.4.6 Help screens ............................................................................................18
3.4.7 Backlight and contrast adjustments..........................................................19
3.5 Instrument set and accessories.......................................................................20
3.5.1 Standard set TV 450/455 .........................................................................20
3.5.2 Optional accessories ................................................................................20
4 Instrument operation............................................................................................21
4.1 Function selection ...........................................................................................21
4.2 Settings ...........................................................................................................22
4.2.1 Language .................................................................................................22
4.2.2 Initial settings ...........................................................................................23
4.2.3 Memory ...................................................................................................24
4.2.4 Date and time...........................................................................................24
4.2.5 RCD standard .........................................................................................25
4.2.6 Isc factor...................................................................................................26
4.2.7 Commander support.................................................................................26
5 Measurements ......................................................................................................28
5.1 Voltage, frequency and phase sequence ........................................................28
5.2 Insulation resistance........................................................................................30
5.3 Resistance of earth connection and equipotential bonding .............................32
5.3.1 R LOWΩ, 200 mA resistance measurement ............................................33
5.3.2 Continuous resistance measurement with low curren ..............................34
5.3.3 Compensation of test leads resistance.....................................................34
5.4 Testing RCDs ..................................................................................................36
5.4.1 Contact voltage (RCD Uc)........................................................................37
5.4.2 Trip-out time (RCDt) .................................................................................38
5.4.3 Trip-out current (RCD I)............................................................................39
5.4.4 RCD Autotest ...........................................................................................40
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TV 450/455 Table of contents
5.5 Fault loop impedance and prospective fault current ........................................43
5.6 Line impedance and prospective short-circuit current / Voltage drop ..............45
5.6.1 Line impedance and prospective short circuit current ..............................46
5.6.2 Voltage drop ............................................................................................47
5.7 Earth resistance ..............................................................................................50
5.8 PE test terminal ...............................................................................................52
6 Data handling........................................................................................................54
6.1 Memory organization.......................................................................................54
6.2 Data structure..................................................................................................54
6.3 Storing test results...........................................................................................56
6.4 Recalling test results .......................................................................................57
6.5 Clearing stored data ........................................................................................58
6.5.1 Clearing complete memory content..........................................................58
6.5.2 Clearing measurement(s) in selected location .........................................58
6.5.3 Clearing individual measurements ...........................................................59
6.5.4 Renaming installation structure elements.................................................60
6.6 Communication ...............................................................................................61
7 Upgrading the instrument....................................................................................62
8 Maintenance..........................................................................................................63
8.1 Fuse replacement............................................................................................63
8.2 Cleaning ..........................................................................................................63
8.3 Periodic calibration ..........................................................................................63
8.4 Service ............................................................................................................63
9 Technical specifications ......................................................................................64
9.1 Insulation resistance........................................................................................64
9.2 Continuity ........................................................................................................65
9.2.1 Resistance R LOWΩ................................................................................65
9.2.2 Resistance CONTINUITY.........................................................................65
9.3 RCD testing .....................................................................................................65
9.3.1 General data ............................................................................................65
9.3.2 Contact voltage RCD-Uc ..........................................................................66
9.3.3 Trip-out time .............................................................................................66
9.3.4 Trip-out current.........................................................................................66
9.4 Fault loop impedance and prospective fault current ........................................67
9.4.1 No disconnecting device or FUSE selected .............................................67
9.4.2 RCD selected ...........................................................................................68
9.5 Line impedance and prospective short-circuit current / Voltage drop ..............68
9.6 Resistance to earth .........................................................................................70
9.7 Voltage, frequency, and phase rotation...........................................................70
9.7.1 Phase rotation ..........................................................................................70
9.7.2 Voltage .....................................................................................................70
9.7.3 Frequency ................................................................................................70
9.7.4 Online terminal voltage monitor................................................................71
9.8 General data....................................................................................................71
A Appendix A - Fuse table.......................................................................................72
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TV 450/455 Table of contents
A.1 Fuse table - IPSC ............................................................................................72
A.2 Fuse table - impedances (UK) .........................................................................74
B Appendix B - Accessories for specific measurements .....................................76
C Appendix F – Country notes................................................................................77
C.1 List of country modifications ............................................................................77
C.2 Modification issues ..........................................................................................77
C.2.1 AT modification - G type RCD ..................................................................77
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TV 450/455 Preface
1 Preface
Congratulations on your purchase of the TV 450/455 instrument and its accessories
from TESTBOY. The instrument was designed on a basis of rich experience, acquired
through many years of dealing with electric installation test equipment.
The TV 450/455 instrument is professional, multifunctional, hand-held test instrument
intended to perform all the measurements required in order for a total inspection of
electrical installations in buildings. The following measurements and tests can be
performed:
Voltage and frequency,
Continuity tests,
Insulation resistance tests,
RCD testing,
Fault loop / RCD trip-lock impedance measurements,
Line impedance / Voltage drop,
Phase sequence
Earthing resistance tests
The graphic display with backlight offers easy reading of results, indications,
measurement parameters and messages. Two LED Pass/Fail indicators are placed at
the sides of the LCD.
The operation of the instrument is designed to be as simple and clear as possible and
no special training (except for the reading this instruction manual) is required in order to
begin using the instrument.
In order for operator to be familiar enough with performing measurements in general
and their typical applications it is advisable to read TESTBOY handbook Guide for
testing and verification of low voltage installations.
The instrument is equipped with the entire necessary accessory for comfortable testing.
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TV 450/455 Warnings and notes
2 Safety and operational considerations
2.1 Warnings and notes
In order to maintain the highest level of operator safety while carrying out various tests
and measurements, TESTBOY recommends keeping your TV 450/455 instruments in
good condition and undamaged. When using the instrument, consider the following
general warnings:
The symbol on the instrument means »Read the Instruction manual
with special care for safe operation«. The symbol requires an action!
If the test equipment is used in a manner not specified in this user manual,
the protection provided by the equipment could be impaired!
Read this user manual carefully, otherwise the use of the instrument may
be dangerous for the operator, the instrument or for the equipment under
test!
Do not use the instrument or any of the accessories if any damage is
noticed!
If a fuse blows in the instrument, follow the instructions in this manual in
order to replace it!
Consider all generally known precautions in order to avoid risk of electric
shock while dealing with hazardous voltages!
Do not use the instrument in supply systems with voltages higher than
550 V!
Service intervention or adjustment is only allowed to be carried out by a
competent authorized personnel!
Use only standard or optional test accessories supplied by your
distributor!
Consider that older accessories and some of the new optional test
accessories compatible with this instrument only meet CAT III / 300 V
overvoltage safety rating! This means that maximal allowed voltage
between test terminals and ground is 300 V!
The instrument comes supplied with rechargeable Ni-Cd or Ni-MH battery
cells. The cells should only be replaced with the same type as defined on
the battery compartment label or as described in this manual. Do not use
standard alkaline battery cells while the power supply adapter is
connected, otherwise they may explode!
Hazardous voltages exist inside the instrument. Disconnect all test leads,
remove the power supply cable and switch off the instrument before
All normal safety precautions must be taken in order to avoid risk of
electric shock while working on electrical installations!
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TV 450/455 Warnings and notes
Warnings related to measurement functions:
Insulation resistance
Insulation resistance measurement should only be performed on de-energized
objects!
Do not touch the test object during the measurement or before it is fully
discharged! Risk of electric shock!
When an insulation resistance measurement has been performed on a capacitive
object, automatic discharge may not be done immediately! The warning message
and the actual voltage is displayed during discharge until voltage drops below
10 V.
Do not connect test terminals to external voltage higher than 600 V (AC or DC) in
order not to damage the test instrument!
Continuity functions
Continuity measurements should only be performed on de-energized objects!
Parallel impedances or transient currents may influence test results.
Testing PE terminal
If phase voltage is detected on the tested PE terminal, stop all measurements
immediately and ensure the cause of the fault is eliminated before proceeding
with any activity!
Notes related to measurement functions:
General
The indicator means that the selected measurement cannot be performed
because of irregular conditions on input terminals.
Insulation resistance, continuity functions and earth resistance measurements
can only be performed on de-energized objects.
PASS / FAIL indication is enabled when limit is set. Apply appropriate limit value
for evaluation of measurement results.
In the case that only two of the three wires are connected to the electrical
installation under test, only voltage indication between these two wires is valid.
Insulation resistance
If voltages of higher than 10 V (AC or DC) is detected between test terminals, the
insulation resistance measurement will not be performed. If voltages of higher
than 10 V (AC or DC) is detected between test terminals, the insulation
resistance measurement will not be performed.
The instrument automatically discharge tested object after finished
measurement.
A double click of TEST key starts a continuous measurement.
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TV 450/455 Warnings and notes
Continuity functions
If voltages of higher than 10 V (AC or DC) is detected between test terminals, the
continuity resistance test will not be performed.
Before performing a continuity measurement, where necessary, compensate test
lead resistance.
RCD functions
Parameters set in one function are also kept for other RCD functions!
The measurement of contact voltage does not normally trip an RCD. However,
the trip limit of the RCD may be exceeded as a result of leakage current flowing
to the PE protective conductor or a capacitive connection between L and PE
conductors.
The RCD trip-lock sub-function (function selector switch in LOOP position) takes
longer to complete but offers much better accuracy of fault loop resistance (in
comparison to the RL sub-result in Contact voltage function).
RCD trip-out time and RCD trip-out current measurements will only be performed
if the contact voltage in the pre-test at nominal differential current is lower than
the set contact voltage limit!
The autotest sequence (RCD AUTO function) stops when trip-out time is out of
allowable time period.
Z-LOOP
The low limit prospective short-circuit current value depends on fuse type, fuse
current rating, fuse trip-out time and impedance scaling factor.
The specified accuracy of tested parameters is valid only if the mains voltage is
stable during the measurement.
Fault loop impedance measurements will trip an RCD.
The measurement of fault loop impedance using trip-lock function does not
normally trip an RCD. However, the trip limit may be exceeded as a result of
leakage current flowing to the PE protective conductor or a capacitive connection
between L and PE conductors.
Z-LINE / VOLTAGE DROP
In case of measurement of Z
Line-Line
with the instrument test leads PE and N
connected together the instrument will display a warning of dangerous PE
voltage. The measurement will be performed anyway.
Specified accuracy of tested parameters is valid only if mains voltage is stable
during the measurement.
L and N test terminals are reversed automatically according to detected terminal
voltage (except in UK version).
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TV 450/455 Battery and charging
2.2 Battery and charging
The instrument uses six AA size alkaline or rechargeable Ni-Cd or Ni-MH battery cells.
Nominal operating time is declared for cells with nominal capacity of 2100 mAh.
Battery condition is always displayed in the lower right display part.
In case the battery is too weak the instrument indicates this as shown in figure 2.1. This
indication appears for a few seconds and then the instrument turns itself off.
Figure 2.1: Discharged battery indication
The battery is charged whenever the power supply adapter is connected to the
instrument. The power supply socket polarity is shown in figure 2.2.Internal circuit
controls charging and assures maximum battery lifetime.
-
+
Figure 2.2: Power supply socket polarity
The instrument automatically recognizes the connected power supply adapter and
begins charging.
Symbols:
Indication of battery charging
Figure 2.3: Charging indication
When connected to an installation, the instruments battery compartment can
contain hazardous voltage inside! When replacing battery cells or before
opening the battery/fuse compartment cover, disconnect any measuring
accessory connected to the instrument and turn off the instrument,
Ensure that the battery cells are inserted correctly otherwise the instrument will
not operate and the batteries could be discharged.
If the instrument is not to be used for a long period of time, remove all batteries
from the battery compartment.
Alkaline or rechargeable Ni-Cd or Ni-MH batteries (size AA) can be used.
TESTBOY recommends only using rechargeable batteries with a capacity of
2100mAh or above.
Do not recharge alkaline battery cells!
Use only power supply adapter delivered from the manufacturer or distributor of
the test equipment to avoid possible fire or electric shock!
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TV 450/455 Battery and charging
2.2.1 New battery cells or cells unused for a longer period
Unpredictable chemical processes can occur during the charging of new battery cells or
cells that have been left unused for a longer period (more than 3 months). Ni-MH and
Ni-Cd cells can be subjected to these chemical effects (sometimes called the memory
effect). As a result the instrument operation time can be significantly reduced during the
initial charging/discharging cycles of the batteries.
In this situation, TESTBOY recommend the following procedure to improve the battery
lifetime:
Procedure Notes
Completely charge the battery. At least 14h with in-built charger.
This can be performed by using the
Completely discharge the battery.
Repeat the charge / discharge cycle
at least 2-4 times.
Notes:
The charger in the instrument is a pack cell charger. This means that the battery
cells are connected in series during the charging. The battery cells have to be
equivalent (same charge condition, same type and age).
One different battery cell can cause an improper charging and incorrect
discharging during normal usage of the entire battery pack (it results in heating of
the battery pack, significantly decreased operation time, reversed polarity of
defective cell,…).
If no improvement is achieved after several charge / discharge cycles, then each
battery cell should be checked (by comparing battery voltages, testing them in a
cell charger, etc). It is very likely that only some of the battery cells are
deteriorated.
The effects described above should not be confused with the normal decrease of
battery capacity over time. Battery also loses some capacity when it is repeatedly
charged / discharged. Actual decreasing of capacity, versus number of charging
cycles, depends on battery type. This information is provided in the technical
specification from battery manufacturer.
instrument normally until the instrument is
fully discharged.
Four cycles are recommended in order to
restore the batteries to their normal
capacity.
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TV 450/455 Standards applied
2.3 Standards applied
The TV 450/455 instruments are manufactured and tested in accordance with the
following regulations:
Electromagnetic compatibility (EMC)
EN 61326 Electrical equipment for measurement, control and laboratory
use – EMC requirements
Class B (Hand-held equipment used 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 61010-031 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
Other reference standards for testing RCDs
EN 61008 Residual current operated circuit-breakers without integral overcurrent
EN 61009 Residual current operated circuit-breakers with integral overcurrent
EN 60364-4-41 Electrical installations of buildings Part 4-41 Protection for safety –
EN 60364-5-52
BS 7671 IEE Wiring Regulations (17th edition)
AS / NZ 3760 In-service safety inspection and testing of electrical equipment
Note about EN and IEC standards:
Text of this manual contains references to European standards. All standards of
EN 6XXXX (e.g. EN 61010) series are equivalent to IEC standards with the same
number (e.g. IEC 61010) and differ only in amended parts required by European
harmonization procedure.
and 1500 VAC – Equipment for testing, measuring or monitoring of
protective measures
Part 1 General requirements
Part 2 Insulation resistance
Part 3 Loop resistance
Part 4 Resistance of earth connection and equipotential
bonding
Part 5 Resistance to earth
Part 6 Residual current devices (RCDs) in TT and TN systems
Part 7.Phase sequence
Part 10 Combined measuring equipment
protection for household and similar uses
protection for household and similar uses
protection against electric shock
Low-voltage electrical installations – Part 5-52: Selection and erection
of electrical equipment – Wiring systems
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TV 450/455 OFront panel
3 Instrument description
3.1 Front panel
Figure 3.1: Front panel (picture of TV 455)
Legend:
1 LCD 128 x 64 dots matrix display with backlight.
2 TEST
3 UP
4 DOWN
TEST
Modifies selected parameter.
Starts measurements.
Acts also as the PE touching electrode.
5 MEM Store / recall / clear tests in memory of instrument.
6 Function selectors Selects test function.
Backlight,
7
Contrast
Changes backlight level and contrast.
Switches the instrument power on or off.
8 ON / OFF
The instrument automatically turns off 15 minutes after the
last key was pressed.
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TV 450/455 Front panel
Accesses help menus.
In RCD Auto toggles between top and bottom parts of results
9 HELP / CAL
field.
Calibrates test leads in Continuity functions.
Starts Z
measurement in Voltage drop sub-function.
REF
10 TAB Selects the parameters in selected function.
11 PASS Green indicator
12 FAIL Red indicator
Indicates PASS/ FAIL of result.
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TV 450/455 Connector panel
3.2 Connector panel
Figure 3.2: Connector panel
Legend:
1 Test connector Measuring inputs / outputs
2 Protection cover
3 Charger socket
4 USB connector Communication with PC USB (1.1) port.
5 PS/2 connector
Warnings!
Maximum allowed voltage between any test terminal and ground is 600 V!
Maximum allowed voltage between test terminals is 600 V!
Maximum short-term voltage of external power supply adapter is 14 V!
Communication with PC serial port and connection to optional
measuring adapters.
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TV 450/455 Back side
3.3 Back side
Figure 3.3: Back side
Legend:
1 Side belt
2 Battery compartment cover
3 Fixing screw for battery compartment cover
4 Back panel information label
5 Holder for inclined position of the instrument
6 Magnet for fixing instrument close to tested item (optional)
Figure 3.4: Battery compartment
Legend:
1 Battery cells Size AA, alkaline or rechargeable NiMH / NiCd
2 Serial number label
3 Fuse M 0.315 A, 250 V
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TV 450/455 Display organization
3.4 Display organization
Function name
Result field
Test parameter field
Message field
Terminal voltage
monitor
Figure 3.5: Typical function
display
Battery indication
3.4.1 Terminal voltage monitor
The terminal voltage monitor displays on-line the voltages on the test terminals and
information about active test terminals.
Online voltages are displayed together with test terminal indication. All
three test terminals are used for selected measurement.
Online voltages are displayed together with test terminal indication. L
and N test terminals are used for selected measurement.
L and PE are active test terminals; N terminal should also be connected
for correct input voltage condition.
3.4.2 Battery indication
The indication indicates the charge condition of battery and connection of external
charger .
Battery capacity indication.
Low battery.
Battery is too weak to guarantee correct result. Replace or
recharge the battery cells.
Recharging in progress (if power supply adapter is connected).
3.4.3 Message field
In the message field warnings and messages are displayed.
Measurement is running, consider displayed warnings.
Conditions on the input terminals allow starting the measurement;
consider other displayed warnings and messages.
Conditions on the input terminals do not allow starting the
measurement, consider displayed warnings and messages.
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TV 450/455 Display organization
RCD tripped-out during the measurement (in RCD functions).
Instrument is overheated. The measurement is prohibited until the
temperature decreases under the allowed limit.
Result(s) can be stored.
High electrical noise was detected during measurement. Results may
be impaired.
L and N are changed.
Warning! High voltage is applied to the test terminals.
Warning! Dangerous voltage on the PE terminal! Stop the activity
immediately and eliminate the fault / connection problem before
proceeding with any activity!
Test leads resistance in Continuity measurement is not compensated.
Test leads resistance in Continuity measurement is compensated.
High resistance to earth of test probes. Results may be impaired.
3.4.4 Result field
Measurement result is out of pre-set limits (FAIL).
Measurement is aborted. Consider displayed warnings and messages.
3.4.5 Sound warnings
Measurement result is inside pre-set limits (PASS).
Continuous sound Warning! Dangerous voltage on the PE terminal is detected.
3.4.6 Help screens
HELP
Help menus are available in all functions. The Help menu contains schematic diagrams
for illustrating how to properly connect the instrument to electric installation. After
selecting the measurement you want to perform, press the HELP key in order to view
the associated Help menu.
Keys in help menu:
UP / DOWN
HELP
Function selectors / TEST
Opens help screen.
Selects next / previous help screen.
Scrolls through help screens.
Exits help menu.
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TV 450/455 Display organization
Figure 3.6: Examples of help screens
3.4.7 Backlight and contrast adjustments
With the BACKLIGHT key backlight and contrast can be adjusted.
Click
Keep pressed for 1 s
Keep pressed for 2 s Bargraph for LCD contrast adjustment is displayed.
Toggles backlight intensity level.
Locks high intensity backlight level until power is turned off or the
key is pressed again.
Figure 3.7: Contrast adjustment menu
Keys for contrast adjustment:
DOWN
UP
TEST
Function selectors
Reduces contrast.
Increases contrast.
Accepts new contrast.
Exits without changes.
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TV 450/455 Instrument set and accessories
3.5 Instrument set and accessories
3.5.1 Standard set TV 450/455
Instrument
Short instruction manual
Calibration Certificate
Mains measuring cable
Test lead, 3 x 1.5 m
Test probe, 3 pcs
Crocodile clip, 3 pcs
Set of NiMH battery cells
Power supply adapter
CD with instruction manual, and “Guide for testing and verification of low
voltage installations” handbook and PC software PC SW TV 450
Set of carrying straps
RS232 - PS/2 cable
USB cable
3.5.2 Optional accessories
See the attached sheet for a list of optional accessories that are available on request
from your distributor.
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TV 450/455 Function selection
4 Instrument operation
4.1 Function selection
For selecting test function the FUNCTION SELECTOR shall be used.
Keys:
Select test / measurement function:
<VOLTAGE TRMS> Voltage and frequency and phase sequence.
<R ISO> Insulation resistance.
FUNCTION
SELECTOR
UP/DOWN
TAB
TEST
MEM
Keys in test parameter field:
UP/DOWN
TAB
FUNCTION SELECTOR
MEM
General rule regarding enabling parameters for evaluation of measurement / test result:
Parameter
See Chapter 5 for more information about the operation of the instrument test functions.
<R LOWΩ> Resistance of earth connections and bondings.
<Zline> Line impedance
<Zloop> Fault loop impedance.
<RCD> RCD testing.
<EARTH RE> Resistance to earth.
<SETTINGS> General instrument settings.
Selects sub-function in selected measurement function.
Selects the test parameter to be set or modified.
Runs selected test / measurement function.
Stores measured results / recalls stored results.
Changes the selected parameter.
Selects the next measuring parameter.
Toggles between the main functions.
Stores measured results / recalls stored results.
OFF
ON
No limit values, indication: _ _ _.
Value(s) – results will be marked as PASS or FAIL in
accordance with selected limit.
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TV 450/455 Settings
4.2 Settings
Different instrument options can be set in the SETTINGS menu.
Options in both models are:
Selection of language,
Setting the instrument to initial
values,
Selection of reference standard for
RCD test,
Entering Isc factor,
Commander support.
Recalling and clearing stored results,
Setting the date and time,
Figure 4.1: Options in Settings menu
Keys:
UP / DOWN
TEST
Function selectors
Selects appropriate option.
Enters selected option.
Exits back to main function menu.
4.2.1 Language
In this menu the language can be set.
Keys:
UP / DOWN
TEST
Function selectors
Selects language.
Confirms selected language and exits to settings menu.
Exits back to main function menu.
Figure 4.2: Language selection
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TV 450/455 Settings
4.2.2 Initial settings
In this menu the instrument settings and
measurement parameters and limits can be
set to initial (factory) values.
Figure 4.3: Initial settings dialogue
Keys:
TEST
Function selectors
Warning:
Customized settings will be lost when this option is used!
If the batteries are removed for more than 1 minute the custom made settings will
be lost.
The default setup is listed below:
Instrument setting Default value
Contrast As defined and stored by adjustment procedure
Isc factor 1.00
RCD standards EN 61008 / EN 61009
Language English
Commander Enabled
Function
Sub-function
EARTH RE* No limit
R ISO No limit
Low Ohm Resistance
R LOWΩ
CONTINUITY* No limit
Z - LINE Fuse type: none selected
VOLTAGE DROP ΔU: 4.0 %
Z
Z - LOOP Fuse type: none selected
Zs rcd Fuse type: none selected
RCD RCD t
Restores default settings.
Exits back to main function menu without changes.
Parameters / limit value
Utest = 500 V
No limit
: 0.00 Ω
REF
Nominal differential current: IΔN=30 mA
RCD type: G
Test current starting polarity: (0°)
Limit contact voltage: 50 V
Current multiplier: ×1
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TV 450/455 Settings
Note:
Initial settings (reset of the instrument) can be recalled also if the TAB key is
pressed while the instrument is switched on.
4.2.3 Memory
In this menu the stored data can be recalled
and deleted. See chapter 6 Data handling for
more information.
Figure 4.4: Memory options
Keys:
UP / DOWN Selects option.
TEST
Function selectors
Enters selected option.
Exits back to main function menu.
4.2.4 Date and time
In this menu date and time can be set.
Figure 4.5: Setting date and time
Keys:
TAB
Selects the field to be changed.
UP / DOWN Modifies selected field.
TEST
Function
Confirms new setup and exits.
Exits back to main function menu.
selectors
Warning:
If the batteries are removed for more than 1 minute the set time and date will be
lost.
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