HT GSC60 User manual

Copyright HT ITALIA 2017 Release EN 1.02 - 16/05/2017
GSC60
User manual

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Table of contents:
1.PRECAUTIONS AND SAFETY MEASURES ...............................................................3
1.1.Preliminary instructions ..................................................................................................... 3
1.2.During use ......................................................................................................................... 4
1.3.After use ............................................................................................................................ 4
1.4.Definition of measurement (overvoltage) category............................................................ 4
2.GENERAL DESCRIPTION ...........................................................................................5
2.1.Foreword ........................................................................................................................... 5
3.PREPARATION FOR USE ...........................................................................................6
3.1.Initial checks...................................................................................................................... 6
3.2.Instrument power supply ................................................................................................... 6
3.3.Storage.............................................................................................................................. 6
4.NOMENCLATURE........................................................................................................7
4.1.Instrument description ....................................................................................................... 7
4.2.Description of measuring leads ......................................................................................... 7
4.3.Keyboard description......................................................................................................... 8
4.4.Display description ............................................................................................................ 8
4.5.Initial screen ...................................................................................................................... 8
5.GENERAL MENU .........................................................................................................9
5.1.Instrument settings ............................................................................................................ 9
5.1.1.Language ................................................................................................................................. 9
5.1.2.Reference country.................................................................................................................. 10
5.1.3.Automatic Power OFF for display and key sound ................................................................. 10
5.1.4.System ................................................................................................................................... 10
5.1.5.Operator name entry.............................................................................................................. 11
5.1.6.System date/time setting........................................................................................................ 11
5.2.Information ...................................................................................................................... 11
6.OPERATING INSTRUCTIONS...................................................................................12
6.1.RPE: Continuity of protective conductors........................................................................ 12
6.1.1.Anomalous situations............................................................................................................. 15
6.2.M: Measurement of insulation resistance ..................................................................... 16
6.2.1.Anomalous situations............................................................................................................. 19
6.3.RCD: Test on differential switches .................................................................................. 20
6.3.1.AUTO mode ........................................................................................................................... 24
6.3.2.x½, x1, x2, x5 modes ............................................................................................................. 25
6.3.3.Mode x1 – Test on RCDs with delay time.............................................................................. 25
6.3.4.Mode ................................................................................................................................. 26
6.3.5.Test on earth leakage relay RCD .......................................................................................... 27
6.3.6.Anomalous situations............................................................................................................. 28
6.4.LOOP: Line impedance/Loop and overall earth resistance............................................. 31
6.4.1.Test types............................................................................................................................... 33
6.4.2.STD Mode – Generic test ...................................................................................................... 35
6.4.3.Mode kA – Verify of breaking capacity of protection device.................................................. 37
6.4.4.Mode I2t – Verify of protection against short-circuit ............................................................... 39
6.4.5.Mode - Verify of protection coordination ..................................................................... 42
6.4.6.Mode - Verify of protection coordination – Norvay country......................................... 44
6.4.7.Verify of protection against indirect contacts (TN system) .................................................... 46
6.4.8.Verify of protection against indirect contacts (IT systems) .................................................... 48
6.4.9.Verify of protection against indirect contacts (TT systems)................................................... 49
6.4.10.Impedance measurement by means of the accessory IMP57 .............................................. 51
6.4.11.Anomalous situations............................................................................................................. 53
6.5.SEQ: Phase sequence and phase concordance test...................................................... 55
6.5.1.Anomalous situations............................................................................................................. 58
6.6.LEAKAGE: Leakage current measurement and recording.............................................. 59
6.7.EARTH: Measurement of earth resistance...................................................................... 62
6.7.1.3-wire or 2-wire earth measurement and 4-wire ground resistivity ....................................... 62
6.7.2.3-wire or 2-wire earth measure – USA, Extra Europe and Germany countries .................... 68
6.7.3.Earth measurement with optional clamp T2100 .................................................................... 71

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6.7.4.Anomalous situations in 3-wire and 2-wire earth measurements.......................................... 74
6.8.AUX: Measure and recording of ambient parameters ..................................................... 75
6.9.∆V%: Voltage drop of main lines..................................................................................... 78
6.9.1.Anomalous situations............................................................................................................. 82
6.10.PQA: Measurement and recording of main parameters.................................................. 84
6.10.1.Connections types ................................................................................................................. 84
6.10.2.General settings..................................................................................................................... 88
6.10.3.Display of measurements ...................................................................................................... 90
6.10.4.Start recording ....................................................................................................................... 92
6.11.List of message at display ............................................................................................... 94
7.OPERATIONS WITH THE MEMORY.........................................................................95
7.1.Saving measurements..................................................................................................... 95
7.1.1.Saving safety tests and snapshots ........................................................................................ 95
7.1.2.Recall and delete safety measurements and snapshots....................................................... 96
7.1.3.Recall and delete saved recordings....................................................................................... 97
7.1.4.Anomalous situations............................................................................................................. 98
8.CONNECTING THE INSTRUMENT TO A PC OR MOBILE DEVICES ......................99
8.1.Connection to iOS/Android devices through WiFi ........................................................... 99
9.MAINTENANCE........................................................................................................100
9.1.General information....................................................................................................... 100
9.2.Recharging and replacement of the batteries ............................................................... 100
9.3.Cleaning the instrument ................................................................................................ 100
9.4.End of life ...................................................................................................................... 100
10.TECHNICAL SPECIFICATIONS...............................................................................101
10.1.Technical characteristics safety section........................................................................ 101
10.2.Technical characteristics PQA section.......................................................................... 105
10.3.Reference guidelines..................................................................................................... 107
10.4.General characteristics.................................................................................................. 107
10.5.Environment .................................................................................................................. 108
10.5.1.Environmental conditions for use......................................................................................... 108
10.6.Accessories................................................................................................................... 108
11.SERVICE..................................................................................................................109
11.1.Warranty conditions....................................................................................................... 109
11.2.Service .......................................................................................................................... 109
12.THEORETICAL APPENDIXES.................................................................................110
12.1.Continuity of protective conductors ............................................................................... 110
12.2.Insulation resistance...................................................................................................... 111
12.3.Checking circuit separation ........................................................................................... 112
12.4.Test on differential switches (RCD)............................................................................... 114
12.5.Verify of the breaking capacity of protection devices .................................................... 115
12.6.Verify of protection against indirect contacts in TN systems ......................................... 116
12.7.Verify of protection against indirect contacts in TT systems ......................................... 118
12.8.Verify of protection against indirect contacts in IT systems........................................... 119
12.9.Verify of protection coordination L-L, L-N and L-PE...................................................... 120
12.10.Verify of the protection against short circuits – Test I2t................................................. 122
12.11.Verification of voltage drop on main lines...................................................................... 123
12.12.Measurement of earth resistance in TN systems .......................................................... 124
12.13.Voltage Anomalies ........................................................................................................ 129
12.14.Supply voltage unbalance ............................................................................................. 129
12.15.Voltage and current Harmonics..................................................................................... 130
12.16.Definitions of powers and power factors ....................................................................... 133
12.17.Measuring method: outlines .......................................................................................... 136
12.18.Description of typical configurations.............................................................................. 137

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1. PRECAUTIONS AND SAFETY MEASURES
The instrument is been designed in compliance with directives IEC/EN61557 and
IEC/EN61010-1, relevant to electronic measuring instruments. Before and after carrying
out measurements, carefully observe the following instructions:
Do not carry out any voltage or current measurement in humid environments.
Do not carry out any measurements in case gas, explosive materials or flammables are
present, or in dusty environments.
Avoid any contact with the circuit being measured if no measurements are being
carried out.
Avoid contact with exposed metal parts, with unused measuring probes, etc.
Do not carry out any measurement in case you find anomalies in the instrument such
as deformations, breaks, substance leaks, absence of display on the screen, etc.
Pay special attention when measuring voltages higher than 25V in special
environments (such as construction sites, swimming pools, etc.) and higher than 50V in
normal environments, since a risk of electrical shock exists.
Only use original HT accessories.
The following symbols are used in this manual:
CAUTION: observe the instructions given in this manual; improper use could
damage the instrument, its components or create dangerous situations for the
operator.
High voltage danger: electrical shock hazard.
Double insulation
AC voltage or current
DC voltage or current
Connection to earth
1.1. PRELIMINARY INSTRUCTIONS
This instrument has been designed for use in the environmental conditions specified in
§ 10.5.1. Do not use in different environmental conditions.
The instrument may be used for measuring and verifying the safety of electrical
systems. Do not use on systems exceeding the limit values specified in § 10.4.
We recommend following the normal safety rules devised to protect the user against
dangerous currents and the instrument against incorrect use.
Only the accessories supplied with the instrument (in particular the external adapter
A0060) guarantee compliance with safety standards. They must be in good conditions
and be replaced with identical models, when necessary.
Make sure the batteries are correctly installed.
Before connecting the test leads to the circuit being measured, check that the desired
function has been selected

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1.2. DURING USE
Please carefully read the following recommendations and instructions:
CAUTION
Failure to comply with the caution notes and/or instructions may damage
the instrument and/or its components or be a source of danger for the
operator.
Before changing function, disconnect the test leads from the circuit under test.
When the instrument is connected to the circuit under test, never touch any terminal,
even if unused.
Avoid measuring resistance if external voltages are present. Even if the instrument is
protected, excessive voltage could cause damage.
While measuring current, place the clamp jaws as far as possible from the conductors
not involved in the measurement, as the magnetic field they produce could interfere
with the measuring operations and place the conductor as much as possible in the
center of the jaws to maximize accuracy.
1.3. AFTER USE
When measurements are completed, turn off the instrument by pressing and holding the
ON/OFF key for some seconds. If the instrument is not to be used for a long time, remove
the batteries and follow the instructions given in § 3.3.
1.4. DEFINITION OF MEASUREMENT (OVERVOLTAGE) CATEGORY
Standard "IEC/EN61010-1: Safety requirements for electrical equipment for measurement,
control and laboratory use, Part 1: General requirements” defines what measurement
category, commonly called overvoltage category, is. § 6.7.4: Measured circuits, reads:
circuits are divided into the following measurement categories:
Measurement Category IV is for measurements performed at the source of a low-
voltage installation.
Examples are electricity meters and measurements on primary overcurrent protection
devices and ripple control units.
Measurement Category III is for measurements performed on installations inside
buildings.
Examples are measurements on distribution boards, circuit breakers, wiring, including
cables, bus-bars, junction boxes, switches, socket-outlets in fixed installation, and
equipment for industrial use and some other equipment, for example, stationary motors
with permanent connection to fixed installation.
Measurement Category II is for measurements performed on circuits directly
connected to the low-voltage installation.
Examples are measurements on household appliances, portable tools and similar
equipment.
Measurement Category I is for measurements performed on circuits not directly
connected to MAINS.
Examples are measurements on circuits not derived from MAINS, and specially
protected (internal) MAINS-derived circuits. In the latter case, transient stresses are
variable; for that reason, the standard requires that the transient withstand capability of
the equipment is made known to the user.

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2. GENERAL DESCRIPTION
2.1. FOREWORD
The instrument is equipped with a TFT color LCD display, with capacitive "touch-screen"
that can be handled simply with the touch of a finger by the user and is structured with an
icon-based menu allowing the direct selection of measurement functions for quick and
intuitive use.
The instrument can perform the following tests:
RPE Continuity test of earth, protective and equipotential conductors with test
current higher than 200mA and open-circuit voltage between 4V and 24V
MMeasurement of insulation resistance with continuous test voltage of 50V,
100V, 250V, 500V or 1000V DC
RCD Test on molded case RCD (Standard – STD) and on earth leakage relay
RCD ( ) General (G), Selective (S) and Delayed ( ) of type A ( )
and AC ( ) and B ( ) of the following parameters: tripping time,
tripping current, contact voltage
LOOP Measurement of line impedance/Loop P-N, P-P, P-E with calculation of
the assumed short-circuit current, also with high resolution (0.1m) (by
means of optional accessory IMP57), overall earth resistance without
causing the RCD tripping, check of the interruption capacity of
magnetothermal protections (MCB) and fuses, I2t test, protection check
in case of indirect contacts
EARTH Measurement of earth impedance and ground resistivity by
voltammetric method and by an external clamp connected to the
instrument (optional accessory T2100)
SEQ Indication of phase sequence with 2- or 1-terminal method
AUX Measurement and recording of environmental parameters (illuminance, air
temperature, humidity) by means of optional external probes and DC voltage
signals
LEAKAGE Measurement and recording of leakage current (by means of the
optional transducer clamp HT96U)
ΔV% Measurement of percentage voltage drop on main lines
PQA Real-time measurement and recording of mains parameters, harmonic
analysis, voltage anomalies (sags, swells), power/energy consumption
in single-phase and three-phase generic systems

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3. PREPARATION FOR USE
3.1. INITIAL CHECKS
Before shipping, the instrument has been checked from an electric as well as mechanical
point of view. All possible precautions have been taken so that the instrument is delivered
undamaged. However, we recommend checking it to detect any damage possibly suffered
during transport. In case anomalies are found, immediately contact the Dealer.
We also recommend checking that the packaging contains all the components indicated in
§ 10.6. In case of discrepancy, please contact the Dealer. In case the instrument should
be returned, please follow the instructions given in § 11.
3.2. INSTRUMENT POWER SUPPLY
The instrument is powered by 6x1.2V NiMH rechargeable batteries type AA LR06 supplied
with the instrument or by 6x1.5V alkaline batteries type AA LR06. Rechargeable batteries
must be recharged by using the external charger A0060, also provided with the instrument.
The green “ ” symbol indicates a sufficient charge level for the correct performance of the
tests. The red “ ” symbol indicates an insufficient charge level for the correct performance
of the tests. In this case, recharge the batteries (see § 9.2).
CAUTION
If the external adapter is used, it is necessary to connect it first to the
instrument, then to the mains, then please connect the instrument to the
circuit to be tested
The external adapter A0060 can be used both for verification tests
(SAFETY) and for network analyses (PQA)
While recording it is recommended to use both the external adapter and
the rechargeable batteries, in order to guarantee the instrument’s supply
in case of voltage interruption
With low battery indication, stop the tests and recharge or replace the
batteries (see § 9.2)
The instrument is capable of keeping data stored even without batteries
The instrument has an AutoPower OFF function (which can be
deactivated) after 5 minutes’ idling (the Auto Power OFF is inactive while
recording – see § 5.1.3)
3.3. STORAGE
In order to guarantee precise measurement, after a long storage time under extreme
environmental conditions, wait for the instrument to come back to normal condition (see §
10.5.1).

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4. NOMENCLATURE
4.1. INSTRUMENT DESCRIPTION
CAPTION:
1. Inputs
2. LCD Touch screen display
3. Function keys F1, F2, F3, F4
4. ,, , / ENTER keys
5. Compartment of the connector
for optical cable/USB port
6. ESC key
7. GO/STOP key
8. HELP key
9. SAVE key
10.ON/OFF key
Fig. 1: Description of the front part of the instrument
CAPTION:
1. Connector for remote probe
2. B1, B2, B3, B4 inputs
3. I1, I2, I3, I4 inputs
Fig. 2: Description of the upper part of the instrument
CAPTION:
1. Connector for external adapter
2. Connector for optical/USB cable
Fig. 3: Description of the instrument's side
4.2. DESCRIPTION OF MEASURING LEADS
CAPTION:
1. Hand protection
2. Safe area
Fig. 4: Description of measuring leads

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4.3. KEYBOARD DESCRIPTION
The keyboard includes the following keys:
ON/OFF key to switch on/off the instrument
ESC key to exit the selected menu without confirming
keys to move the cursor through the different screens in order
to select the desired programming parameters
HOME / ENTER key to back to general Menu on each moment
GO/STOP key to start the measurement
SAVE key to save the measured values
HELP key to access the online help and display the possible connections
between the instrument and the system for each selected function
F1, F2, F3, F4 Function keys corresponding to the activation of the four icons on the
bottom of the screen as an alternative to direct touch on the display
4.4. DISPLAY DESCRIPTION
The display is an LCD, 320x240pxl TFT color display with
capacitive touch screen whose icon-structure can be directly
selected with a simple touch. The first line of the display
indicates the type of active measurement, the date/time and
the battery charge indication.
4.5. INITIAL SCREEN
When switching on the instrument, the initial screen appears
for a few seconds. It shows:
The HT manufacturer's logo
The instrument model
The Firmware version (LCD and CPU)
The serial number (SN:) of the instrument
The date of instrument calibration (Calibration date:)
After a few seconds, the instrument switches to the general menu.

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5. GENERAL MENU
Pressing the ENTER key in any condition of the instrument allows to go back to the
general menu in which internal parameters may be set, the saved measures can be
displayed and the desired measuring function may be selected.
Fig. 5: General menu of the instrument
Touch the icon to move to the following page of the general menu and the icon
to go back to the previous page. Inside the screens, touch the icon to confirm a
selection or the icon to exit without confirming.
5.1. INSTRUMENT SETTINGS
Touch the icon. The screen to the side appears on the
display. The following settings are available:
System language setting
Setting of the type of electrical system
Setting of the country
Operator name setting
System date/time setting
Activation/deactivation of display AutoPower OFF and of
key sound
Settings will be maintained also after switching off the
instrument.
5.1.1. Language
Touch the icon to select the system language. The
screen to the side appears on the display.
Select the desired language, confirm the choice and return
to the previous screen.

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5.1.2. Reference country
Touch the icon to select the reference country. This
choice have influence on the LOOP and EARTH
measurements (see § 6.4 and § 6.7) as shown in Table 1.
The screen to the side appears on the display.
Select the desired country, confirm the choice and return to
the previous screen
Europe Extra Europe USA Germany Norvay
LOOP
TT Europe mode Europe mode Not available Europe mode Europe mode
TN Europe mode Europe mode Europe mode Europe mode Norvay mode
IT Europe mode Europe mode Not available Europe mode Norvay mode
EARTH Ra
TT Europe mode Europe mode Not available Europe mode Europe mode
TN Europe mode USA mode USA mode USA mode Europe mode
IT Europe mode Europe mode Not available Europe mode Europe mode
EARTH
(measure with
T2100)
TT Europe mode Europe mode Not available Europe mode Europe mode
TN Europe mode USA mode USA mode USA mode Europe mode
IT Europe mode Europe mode Not available Europe mode Europe mode
Table 1: LOOP and EARTH measurements depending on reference countries
5.1.3. Automatic Power OFF for display and key sound
Touch the icon. The screen to the side appears on the
display.
Move the slide bar reference of section " " down/up to
turn off/on the Automatic Power OFF of the instrument after
a period of inactivity of 5 minutes.
Move the slide bar reference of section " " down/up to
disable/enable the sound key when pressed. Confirm the
choices made and go back to the previous screen.
5.1.4. System
Touch the icon to select the type of electrical system
(TT, TN or IT), of the mains frequency (50Hz, 60Hz), of the
limit value for contact voltage (25V, 50V) and rated voltage
value to be used for calculating the assumed short-circuit
current. The screen to the side appears on the display.
NOTE: for “USA” country this icon is not displayed and
the electrical system is fixed to TN
Move the slide bar references to select the options. Confirm
the choices made and go back to the previous screen.

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5.1.5. Operator name entry
Touch the icon to enter the name of the operator that
will be displayed in the header of each measurement
downloaded to PC. The screen to the side appears on the
display.
Set the desired name using the virtual keyboard (max 12
characters).
Confirm the settings or exit without saving.
5.1.6. System date/time setting
Touch the icon to set the system date/time. The screen
to the side appears on the display.
Touch the "EU" icon for the European date/time system in
the format "DD/MM/YY hh:mm" or the "US" icon for the
American system in the format "MM/DD/YY hh:mm AM/PM".
Touch the up/down arrow keys to set the desired value.
Confirm the settings or exit without saving.
Current date/time is kept inside the instrument without
batteries for approximately 12 hours.
5.2. INFORMATION
Touch the icon . The display shows the screen on the
right with the icons relative to the properties of the
instrument, the optional accessories IMP57 and T2100 and
the HTAnalysis APP
Touch the icon . The display shows the screen on the
right as well as following information:
Serial number
Internal version of Firmare and Hardware (for the
accessories IMP57 and T2100 these informations are
available only after the connection to the instrument)
Last calibration date
Touch the icon . The display shows the screen on the
right with the QR code of HTAnalysis APP (see § 8.1) in
iOS and Android systems. This code permits an easy
access to the Apple Store to download the APP
Touche the icon to exit and return to the general menu

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6. OPERATING INSTRUCTIONS
6.1. RPE: CONTINUITY OF PROTECTIVE CONDUCTORS
This function is performed in compliance with standards IEC/EN61557-4 and allows
measuring the resistance of protective and equipotential conductors.
CAUTION
The instrument can be used for measurements on installations with
overvoltage category CAT IV 300V to earth and max 600V between inputs.
Do not connect the instrument on installations with voltage exceeding the
limits indicated in this manual. Exceeding these limits could cause electrical
shock to the user and damage to the instrument.
We recommend holding the alligator clip respecting the safety area created
by the hand protection (see § 4.2).
Check that no voltage is present at the ends of the item to be tested before
carrying out a continuity test.
The results may be influenced by the presence of auxiliary circuits
connected in parallel with the item to be tested or by transient currents.
The following operating modes are available:
Compensation of the resistance of the cables used for measurement. The
instrument automatically subtracts the value of cable resistance from the
measured resistance value. Therefore, it is necessary that this value is
measured each time the measuring cables are changed or extended.
AUTO The instrument carries out two measurements with inverted polarity and
displays their average value. Recommended mode
The instrument carries out the measurement with the possibility of setting a
duration time for testing. The operator may set a sufficiently long measuring
time (between 1s and 99s) to be able to move the protective conductors while
the instrument is carrying out the test, in order to find out a possible bad
connection.
CAUTION
Continuity test is carried out by supplying a current higher than 200mA
in case the resistance does not exceed ca. 2(including resistance of
the test cables). For higher resistance values, the instrument carries out
the test with a current lower than 200mA.
Fig. 6: Continuity test by means of single cables and remote lead

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1. Touch the icon. The screen to the side appears on
the display. The instrument automatically carries out the
test for the presence of voltage between the inputs
(shown on the display) and blocks the test in case of
voltage higher than 10V
Touch the “AUTO” icon to set the measuring mode. The
following screen appears on the display:
2. Move the slide bar reference in the positions "AUTO"
(Automatic mode) or " " (Timer mode). Confirm the
choice by going back to the previous screen.
If Timer mode is selected, the following screen is shown:
3. Touch the icon to zero the value in the Timer field
and use the virtual keyboard to set the value in seconds
between 1s and 99s. Confirm the choice by going back to
the initial measurement screen.
4. Touch the icon "Rxx" to set the maximum limit value of
the resistance on which the instrument makes the
comparison with the measured value. The screen to the
side appears on the display.
Touch the icon to zero the value in the “R” field.
Use the virtual keyboard to set the value between 1and
99.
Confirm the choice by going back to the initial
measurement screen. Note the presence of the set limit
value.

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5. Perform, if necessary, the compensation of the measuring leads resistance by
connecting the cables or the remote lead as shown in Fig. 7.
Fig. 7: Compensation of single cables and remote lead resistance
6. Touch the icon to activate the measurement. After
a few seconds, the instrument provides the screen to the
side if the operation is successful (Rcables 2); the
indication of the value is shown in the "Rcal" field and the
icon is shown on the display.
Touch the "AUTO" icon or " " to go back to the main
measurement screen.
CAUTION
Before connecting the test leads, make sure that there is no voltage at
the ends of the conductor to be tested.
7. Connect the alligator clips and/or test leads and/or remote lead to the conductor to
be tested as in Fig. 6.
CAUTION
Always make sure, before any measurement, that the compensation
resistance value is referred to the cables currently used. In case of
doubt, repeat points 5 and 6.
8. Press the GO/STOP key on the instrument or the START key on the remote lead.
The instrument will start the measurement. During this whole stage, do not
disconnect the test leads of the instrument from the conductor under test. The
following screen appears on the display:
9. The value of the result is shown in the upper part of the
screen, while the partial values of the test with inverted
polarity of the test source in addition to the real test
currents are reported in the fields "R+" and "R-".
The symbol indicates the positive result of the
measurement.
Press the SAVE button or touch the icon to save the
measurement (see § 7.1).

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10. At the end of the test, if the value of the measured
resistance is higher than the set limit, the screen to the
side is shown on the display.
The value is shown in red and the symbol indicates
the negative result of the measurement. The "> 99.9"
message indicates the instrument overload status.
Press the SAVE button or touch the icon to save the
measurement (see § 7.1).
6.1.1. Anomalous situations
1. In AUTO or " " modes if the instrument detects a
resistance lower than the set limit value but for which is it
not able to generate a current of 200mA, the screen to
the side is displayed.
The symbol is shown on the display and the values of
the real test current are indicated in red.
2. If in mode the instrument detects a resistance
higher than 2at its terminals, it resets the offset value
and displays a screen like the one to the side. The
icon is shown on the display to indicate the calibration
reset value (i.e. performing the operation with open
terminals).
3. In case the instrument detects that the calibrated
resistance is higher that the measured resistance, the
instrument gives out a long sound and displays a screen
like the one to the side. The icon is shown on the
display to indicate the calibration reset value.
4. If the instrument detects a voltage value higher than
approx. 10V at its terminals, it does not carry out the test,
gives out a long sound and the screen reported here to
the side is displayed

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6.2. M: MEASUREMENT OF INSULATION RESISTANCE
This function is performed in compliance with standards IEC/EN61557-2 and allows
measuring the insulation resistance between the active conductors and between each
active conductor and the earth.
CAUTION
The instrument can be used for measurements on installations with
overvoltage category CAT IV 300V to earth and max 600V between inputs.
Do not connect the instrument on installations with voltage exceeding the
limits indicated in this manual. Exceeding these limits could cause electrical
shock to the user and damage to the instrument.
We recommend holding the alligator clip respecting the safety area created
by the hand protection (see § 4.2).
Check that the circuit being tested is not live and that all possible loads
normally connected to it are disconnected before carrying out insulation
measurement.
The following operating modes are available:
AUTO The test is activated by the GO/STOP key of the instrument (or START of the
remote lead). The instrument automatically detects the presence of possible
capacitance and waits until test nominal voltage is reached (typically approx. 2
seconds). Recommended mode
The operator may set a sufficiently long measuring time (1s 999s) to be able
to move the test lead on the conductors being tested, while the instrument is
carrying out the test. For the whole measurement duration, the instrument will
give out a short sound every second. While measuring, if the insulation
resistance reaches a lower value than the set limit, the instrument will give a
continuous acoustic signal. To stop the test, press again the GO/STOP key on
the instrument or the START key on the remote lead. At the end of test, the
lowest value of insulation (worst case) detected during the test will be shown by
the instrument
Fig. 8: Insulation test by means of single cables and remote lead
Fig. 9: Insulation test by means of shuko plug

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1.
Touch the icon. The screen to the side appears
on the display. The instrument automatically carries out
the test for the presence of voltage between the inputs
(shown on the display) and blocks the test in case of
voltage higher than approx. 10V
Touch the “AUTO” icon to set the measuring mode. The
following screen appears on the display:
2. Move the slide bar reference in the positions "AUTO"
(Automatic mode) or " " (Timer mode). Confirm the
choice by going back to the previous screen.
If Timer mode is selected, the following screen is
shown:
3. Touch the icon to zero the value in the Timer field
and use the virtual keyboard to set the value in seconds
between 1s and 999s. Confirm the choice by going
back to the initial measurement screen.
4. Touch the icon "Rxx" to set the minimum limit value
of the insulation resistance on which the instrument
makes the comparison with the measured value. The
screen to the side appears on the display.
Touch the icon to zero the value in the “R” field.
Use the virtual keyboard to set the value between
0.01Mand 999M.
Confirm the choice by going back to the initial
measurement screen. Note the presence of the set limit
value.
5. Touch the "xxxxV" icon to set the test DC voltage in the
insulation measurement. The screen to the side
appears on the display.
Move the slide bar reference to the desired value for
test voltage by choosing among 50, 100, 250, 500,
1000VDC.
Confirm the choice by going back to the initial
measurement screen. Note the presence of the set limit
value.

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CAUTION
Disconnect any cable not strictly involved in measurement and especially
check that no cable is connected to In1 input.
Before connecting the test leads, make sure that there is no voltage at the
ends of the conductors to be tested.
6. Connect the alligator clips and/or test leads and/or remote lead to the ends of the
conductors to be tested as in Fig. 8 and Fig. 9.
7.
Press the GO/STOP key on the instrument or the START key on the remote lead. The
instrument will start the measurement.
CAUTION
During this whole stage, do not disconnect the test leads of the instrument
from the conductor under test. It could remain charged with a dangerous
voltage due to the stray capacitances in the circuit being tested.
8. Regardless of the operating mode selected, at the end of the measurement, the
instrument applies a resistance to the output leads to discharge the capacitances in the
circuit.
9.
In mode:
The final result is the minimum insulation value measured during the test
Pressing a second time the GO/STOP key or the START key on the remote lead
stops the test before the set time has elapsed.
10. The measurement result is shown both as a numeric
value and in the analog bar graph as shown in the
screen to the side. The values of the real test voltage
and the measurement time are present on the display.
The symbol indicates the positive result of the
measurement.
Press the SAVE button or touch the icon to save
the measurement (see § 7.1).
11. At the end of the test, if the value of the measured
resistance is lower than the set limit, the screen to the
side is shown on the display.
The value is shown in red and the symbol indicates
the negative result of the measurement.
Press the SAVE button or touch the icon to save
the measurement (see § 7.1).