ENGLISH User's manual
ENGLISH
User’s manual
© Copyright HT ITALIA 2008
Release EN 1.02 - 16/07/2008
HT7051
Content:
1 PRECAUTIONS AND SAFETY MEASURES .................................................................2
1.1
1.2
1.3
1.4
Preliminary instructions......................................................................................................... 2
During use............................................................................................................................. 3
After use................................................................................................................................ 3
Definition of measurement (overvoltage) category ............................................................... 3
2 GENERAL DESCRIPTION .............................................................................................4
2.1 Instrument functions.............................................................................................................. 4
3 PREPARATION FOR USE .............................................................................................4
3.1
3.2
3.3
3.4
Initial inspections................................................................................................................... 4
Instrument power supply....................................................................................................... 4
Calibration............................................................................................................................. 4
Storage ................................................................................................................................. 4
4 OPERATING INSTRUCTIONS .......................................................................................5
4.1 Instrument description........................................................................................................... 5
4.2 Turning on the instrument ..................................................................................................... 6
4.2.1. Display description ..................................................................................................................... 7
4.2.2. Auto power off ............................................................................................................................ 7
4.3
4.4
4.5
4.6
Description of measuring leads............................................................................................. 8
GUARD lead ......................................................................................................................... 8
Notes on the insulation measurements................................................................................. 8
FIX 250V, 500V, 1000V, 2500V, 5000V mode ..................................................................... 9
4.6.1. Configuration of the test parameters for FIX mode.................................................................. 12
4.7 ADJUST 100V - 5000V mode ............................................................................................. 13
4.7.1. Configuration of the test parameters for ADJUST mode ......................................................... 16
4.8 RAMP mode........................................................................................................................ 17
4.8.1. Configuration of the test parameters for RAMP#1 mode......................................................... 21
4.8.2. Configuration of the test parameters for RAMP#2 mode......................................................... 22
4.8.3. Configuration of the test parameters for RAMP#3 mode......................................................... 23
4.9 Enable/Disable of SMOOTH function ................................................................................. 24
4.10 Anomalous situations in all modes...................................................................................... 24
5 MANAGEMENT OF MEMORY DATA ..........................................................................26
5.1 How to save measures ....................................................................................................... 26
5.2 How to delete the last or all the measures saved in the memory ....................................... 26
5.3 How to recall measures ...................................................................................................... 27
6 RESET OF INSTRUMENT ............................................................................................28
7 CONNECTION OF THE INSTRUMENT TO PC ............................................................28
8 MAINTENANCE ............................................................................................................29
8.1 General information ............................................................................................................ 29
8.2 Cleaning the instrument ...................................................................................................... 29
8.3 End of life ............................................................................................................................ 29
9 TECHNICAL SPECIFICATIONS...................................................................................30
9.1
9.2
9.3
9.4
9.5
Definition ............................................................................................................................. 30
Technical specifications ...................................................................................................... 30
Safety standards ................................................................................................................. 32
General characteristics ....................................................................................................... 32
Environment........................................................................................................................ 33
9.4.1. Environmental conditions for use............................................................................................. 33
9.4.2. EMC ......................................................................................................................................... 33
9.6 Accessories......................................................................................................................... 33
10 SERVICE.......................................................................................................................34
10.1 Warranty conditions ............................................................................................................ 34
10.2 Service ................................................................................................................................ 34
11 THEORETICAL APPENDIX..........................................................................................35
11.1 P.I. (Polarization Index) and D.A.R. (Dielectric Absorption Ratio) ...................................... 35
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1 PRECAUTIONS AND SAFETY MEASURES
The instrument has been designed in compliance with standards IEC/EN61557 and
IEC/EN61010-1 regarding electronic measuring instruments.
WARNING
For the operator’s safety and to prevent damaging the instrument, follow the
procedures described in this manual and carefully read all notes preceded by
the symbol .
Before and during measurements, carefully observe the following instructions:
Do not perform any measurement in humid environments, in the presence of gas or
explosive or inflammable material or in dusty areas.
Even when no measurements are being performed, avoid any contact with the circuit
being tested, with exposed metal parts, with unused measuring leads or circuits, etc.
Do not perform any measurement when anomalies are found in the instrument, such
as deformations, breaks, substance leaks, no display view, etc.
Pay special attention when measuring voltages above 25V in special environments
(building yards, swimming pools, etc.) and 50V in ordinary environments, as there is
the danger of electric shocks.
In this manual and on the instrument, the following symbols are used:
WARNING: it is necessary to consult the instruction manual to find the type of
potential danger and the actions to be taken.
Observe the instructions reported in the manual. An improper use could damage
the instrument and lead to dangerous situations for the operator.
DC voltage or current.
AC voltage or current.
Dangerous voltages: risk of electric shocks.
Instrument with double insulation.
1.1
PRELIMINARY INSTRUCTIONS
This instrument has been designed for use in an environment with pollution level 2.
It may also be used to test industrial electrical systems up to overvoltage category IV
600V to earth with maximum voltage 600V between inputs.
Follow the usual safety rules to protect the operator from dangerous currents and
protect the instrument against improper use.
Never use the instrument resting on the floor, it must be placed over flat horizontal
surfaces.
Only the accessories supplied with the instrument guarantee safety standards. They
must be in good conditions and replaced, if necessary, with identical models.
Do not measure systems exceeding the current and voltage limit values specified.
Do not perform measurements in environmental conditions not within the limit values
indicated in this manual.
Before connecting the probes to the circuit to be tested, check that the correct function
is selected.
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1.2 DURING USE
Carefully read the following recommendations and instructions:
WARNING
Failure to observe the warnings and/or instructions may damage the
instrument and/or its components or generate a danger for the operator.
If, during use, the low battery symbol appears on the display, insert the supply
cable into the Europlug socket to start battery recharge.
During battery recharge, it is possible to perform measurements.
Before selecting a new function, disconnect the measuring probes from the circuit.
When the instrument is connected to the circuit being tested, never touch any unused
lead.
Avoid measuring resistance with external voltages; even if the instrument is protected,
as an excess voltage may cause instrument malfunctions.
Prevent that the instrument receives voltage during measurement (e.g. a probe slipping
from the measuring point and touching a point under voltage).
Avoid inserting the plug of the supply cable into the Europlug socket while measuring.
1.3 AFTER USE
When measurements are completed, turn off the instrument by pressing the ON/OFF key.
1.4 DEFINITION OF MEASUREMENT (OVERVOLTAGE) CATEGORY
Standard "CEI 61010-1: Safety requirements for electrical equipment for measurement,
control and laboratory use, Part 1: General requirements", defines what is intended for
measurement category, commonly known as overvoltage category. In paragraph 6.7.4:
Measuring circuits, it reads:
circuits are divided into the following measurement categories:
•
•
•
•
Measurement category IV is for measurements performed at the source of a lowvoltage installation.
Examples are electric counters and measurements on primary devices protecting
against overcurrents and on ripple adjusting units.
Measurement category III is for measurements performed on installations inside
buildings.
Examples are measurements performed on distribution boards, circuit breakers, wiring
harnesses, including cables, bars, junction boxes, switches, sockets of fixed
installations and appliances designed for industrial use and other equipment, e.g.
stationary motors connected to fixed systems.
Measurement category II is for measurements performed on circuits directly
connected to the low-voltage installation.
Examples are measurements performed on household appliances, portable tools and
similar equipment.
Measurement category I is for measurements performed on circuits not directly
connected to the MAINS.
Examples are measurements performed on circuits not derived from the MAINS and on
circuits derived from the MAINS provided with a special (internal) protection. In this
latter case, the stress caused by the transients is variable; therefore, (OMISSIS) it is
necessary that the user knows the appliance’s resistance to transients.
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2 GENERAL DESCRIPTION
The instrument You purchased, if used in compliance with the indications given in this
manual, guarantees accurate and reliable measurements and the utmost safety thanks to
a development of new conception which ensures double insulation and, consequently,
compliance with the requirements of overvoltage category IV.
2.1 INSTRUMENT FUNCTIONS
• Measurement of insulation resistance with nominal voltage which can be set between
100V and 5000V.
• Measurement of the dielectric leakage current.
• Measurement of the Polarization Index (P.I.).
• Measurement of the Dielectric Absorption Ratio (D.A.R.).
• Capacitance measurement.
• “Multimeter” function: measurement of voltage at the instrument’s input in “real time” up
to 600VDC and AC.
3 PREPARATION FOR USE
3.1 INITIAL INSPECTIONS
Before shipment, the instrument’s electronics and mechanics have been inspected. All
possible precautions have been taken in order for the instrument to be delivered without
damage.
However, we recommend generally inspecting the instrument in order to detect any
damage suffered during transport. Should you detect any anomalies, immediately contact
the forwarding agent or the dealer.
Moreover, we recommend checking that the package contains all parts listed in paragraph
9.6. Should you find any discrepancy, please contact the dealer. Should it become
necessary to return the instrument, please follow the instructions reported in paragraph 10.
3.2 INSTRUMENT POWER SUPPLY
The instrument is power-supplied through internal batteries which are recharged from the
mains by means of a battery charger integrated in the instrument itself. The symbol
steadily illuminated in the right bottom part indicates that the batteries are flat and must be
recharged.
To recharge the batteries, follow the instructions given in paragraph 9.4.
The instrument can also be supplied through the mains. The display shows the symbol
. Measurements can be performed even when the batteries are being recharged
from the mains.
3.3 CALIBRATION
The instrument complies with the technical specifications reported in this manual. Its
correct operation is guaranteed for one year from the date of purchase.
3.4 STORAGE
In order to guarantee accurate measurements and protect the instrument from possible
failures, after a long storage period under extreme environmental conditions, wait for the
instrument to return to a normal condition (see the environmental specifications listed in
paragraph 9.4.1).
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4 OPERATING INSTRUCTIONS
4.1
INSTRUMENT DESCRIPTION
LEGEND:
1.
2.
3.
4.
Input bushings.
Europlug socket.
RS232 connector.
ON/OFF and backlighting
key.
5. Multifunction arrow keys.
6. FUNC/ERASE MEM key.
7. MODE/CLEAR SMOOTH
key.
8. SET/DISPLAY MEM key.
9. ESC/RECALL MEM key.
10. SAVE key.
11. START/STOP key.
12. Display.
Fig. 1: Instrument description
Multifunction arrow keys:
• they have several functions which are described in detail
below.
ON/OFF and backlighting key:
• to turn on/off the instrument;
• to turn on the display’s backlighting for 20 seconds (short
pressing of the key with the instrument already on).
FUNC/ERASE MEM key:
• to select the desired function;
• to delete the measurements saved during the display of
memory data.
MODE/CLEAR SMOOTH key:
• once a function has been selected, pressing the key once
changes the test mode (if more modes are available);
• after pressing the SET/DISPLAY MEM key, pressing this key
sets the default value of the selected parameter.
SET/DISPLAY MEM key:
• once a function has been selected, pressing the key once
allows setting the test parameters;
• after pressing the ESC/RECALL MEM key, pressing this key
displays the data of the measurement saved in the memory.
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ESC/RECALL MEM key:
• once a function has been selected, pressing the key once
accesses the data saved in the memory (if available);
• from a parameter setting screen or memory data display
screen, pressing the key once allows returning to the previous
screen.
SAVE key:
• once a measurement has been completed, pressing the key
once allows saving the results in the memory;
• from a parameter setting screen, pressing the key once allows
saving the changes made to the parameters.
START/STOP key to start and/or stop a measurement.
4.2
TURNING ON THE INSTRUMENT
When turned on, the instrument gives a
short acoustic signal and, for approximately
one second, all segments of the display
appear.
Then, the instrument shows the firmware
version, then it sets to the last measuring
mode selected before turning off.
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4.2.1. Display description
The display is a backlighted LCD screen which shows three contemporary readings and a
series of symbols. In detail:
Display group 1 shows:
• insulation resistance;
• dielectric leakage current;
• P.I. (Polarization Index);
• D.A.R. (Dielectric Absorption Ratio);
• Capacitance.
Display group 2 shows:
• nominal test voltage;
• generated test voltage.
•
Display group 3 shows the test time.
Bar graph.
Test mode: FIX, ADJUST and RAMP.
“Flash” symbol.
Symbol of values not within limits (alarm).
“Warning” symbol.
“Battery” symbol.
“Power supply from the mains” symbol.
“Timer” symbol.
“Number of test cycles” symbol.
4.2.2. Auto power off
If no test is being carried out, the instrument automatically turns off after approximately 5
minutes after the last time a key was pressed. To reactivate the instrument, it is necessary
to turn it on again by pressing the relevant key.
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4.3
DESCRIPTION OF MEASURING LEADS
LEGEND:
1. Hand protection.
2. Safety area.
Fig. 2: Measuring leads
4.4 GUARD LEAD
In some cases, measurements could be affected by surface currents.
By applying voltage to an insulation to be measured, there may be two distinct currents:
one flowing in the test piece, the other flowing on its surface. In case you want to measure
only the resistance due to current Im flowing in the test piece Rx (which is the significant
one), it is necessary to absorb the surface current If using another lead.
Fig. 3: Currents flowing in the test piece
4.5 NOTES ON THE INSULATION MEASUREMENTS
Measuring a high resistance such as the insulation resistance is very difficult as the value
of the currents considered may be very low.
When measuring, to prevent making mistakes, it is therefore necessary to take the
following precautions:
•
•
•
keep the measuring leads suspended above the path or, anyway, make sure the leads
do not make contact in more then one point;
while measuring high resistances, the area around the measuring instrument and the
appliance being tested must be free. It is recommended to use the timer function so
that the operator may keep at due distance from the leads and from the resistance to
be tested;
it is recommended to use the GUARD lead to measure resistances of some tens of GΩ
or higher.
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4.6 FIX 250V, 500V, 1000V, 2500V, 5000V MODE
This function is performed in compliance with standard IEC/ EN61557-2.
The FIX mode allows a quick selection of the test voltage among the values: 250, 500,
1000, 2500, 5000VDC.
WARNING
The instrument may be used on installations of overvoltage category CAT
IV 600V to earth with maximum voltage 600V between inputs. Do not
connect the instrument to installations with voltages exceeding the limit
values indicated in this manual. If these limit values are exceeded, the
operator may be exposed to electrical shocks and the instrument could get
damaged.
Always connect the measuring leads to the instrument and to the alligator
clips with the accessories disconnected from the system.
It is recommended to hold the alligator clip respecting the safety area
marked by the hand protection (par. 4.3).
Fig. 4: Instrument connection
1.
Turn on the instrument by pressing the relevant key.
2.
Press the FUNC/ERASE MEM key to select the FIX function.
3.
The display shows a screen similar to
that reported here to the side, which
contains:
• the FIX function selected;
• the bar graph set to zero;
• the indication "--- TΩ";
• the test voltage;
• the value of the test time;
• the plug symbol (if the instrument is
supplied from the mains);
• the
battery
symbol
steadily
illuminated or flashing (if batteries
are flat or are being recharged);
• the timer symbol if the duration of
the test has been preset.
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4.
5.
6.
By pressing the arrow
keys,
the
instrument
shows a screen similar to
that reported here to the
side, which contains the
value of the input voltage.
Press the MODE/CLEAR SMOOTH key to set one of the following test
voltages: 250V, 500V, 1000V, 2500V, 5000V.
Insert the measuring leads into the relevant input leads of the instrument -Rx, +Rx
and GUARD, if necessary (par. 4.4).
WARNING
Make sure that there is no voltage at the ends of the measuring points before
connecting them to the measuring leads.
7.
8.
Connect the alligator clips to the part of the system to be tested.
Press the START/STOP key to perform measurement.
WARNING
The display shows the message "Measuring..." which indicates that the
instrument is performing the measurement. During this whole phase:
• do not disconnect the measuring leads of the instrument from the
conductor being tested; the conductor could remain live at a dangerous
voltage because of possible stray capacitances in the circuit tested;
• never insert the plug of the supply cable into the Europlug socket.
9.
During measurement, the instrument
gives a short acoustic signal every
second and the display shows a
screen similar to that reported here to
the side, which contains:
• the FIX function selected;
• the bar graph proportional to the
measured resistance value;
• the numerical indication of the
measured resistance;
• the actual test voltage;
• the symbol of the alarm bell (if the measured value is not within the set limits
and/or if the value of the test voltage is lower than the set nominal value);
• the value of the test time elapsed or remaining (if a test has been set);
• the plug symbol (if the instrument is supplied from the mains);
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•
the battery symbol steadily illuminated or flashing (if batteries are flat or are being
recharged);
• the timer symbol if the duration of the test has been preset;
• the two "flash" symbols to indicate a dangerous voltage;
• the message "MEASURING...".
While measuring, it is also possible to display the leakage current, the D.A.R.
(Dielectric Absorption Ratio if test duration > 1 minute), the P.I. (Polarization Index if
test duration > 10 minutes) which cyclically show when pressing the arrow keys (see
note on P.I. and D.A.R. in par. 11.1).
If no measuring time was set when setting the parameters or if you
want to stop the test in advance before the set time elapses, press the
START/STOP key.
10.
11a. Once measurement is complete and
any capacitance has been discharged,
the instrument shows:
• the value of the measured
insulation resistance;
• the value of the generated voltage;
• the duration of the test.
If the measured resistance value is between the (MIN - MAX) limits previously set,
the instrument shows OK and gives a double acoustic signal.
Or
11b. Once measurement is complete and
any capacitance has been discharged,
the instrument shows:
• the value of the measured
insulation resistance;
• the value of the generated voltage;
• the duration of the test.
If the measured resistance value is not between the (MIN - MAX) limits previously
set, the instrument shows NOT OK, the alarm bell and gives a long acoustic signal.
12.
Once measurement is complete, it is also possible to display the
leakage current, the D.A.R. (Dielectric Absorption Ratio), the P.I.
(Polarization Index) and the capacitance which cyclically show when
pressing the arrow keys (see note on P.I. and D.A.R. in par. 11.1).
If the measured resistance value < 5,0MΩ , the screen displaying the
capacitance shows three hyphens “---“, to indicate that it was
impossible to measure the capacitance, and the symbol
.
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WARNING
If, when scrolling the results obtained, the capacitance value is > 1nF, it is
recommended to repeat the measurement by activating the SMOOTH function
(par. 4.9).
13.
Measures can be saved by pressing the SAVE key twice (par. 5.1).
4.6.1. Configuration of the test parameters for FIX mode
a.
By cyclically pressing the SET/DISPLAY MEM key, it is
possible to select the following parameters:
• minimum value of the insulation resistance (MIN) in a
range between 0,01MΩ - MAX;
• maximum value of the insulation resistance (MAX) in a
range between (MIN) - 10TΩ;
• test time value in a range between (00min:05sec) (99min:59 sec).
b.
Press the arrow keys to change the value of the
parameters (a long pressing of the keys allows a rapid
change of the values).
c.
Press the MODE/CLEAR SMOOTH key to remove the limit
values set for the parameters. The display shows the
message "no" to indicate that there is no limit set.
d.
After setting, press the SAVE key to save the changes
made or press the ESC/RECALL MEM key to exit without
saving and return to the previous screen.
or
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4.7 ADJUST 100V - 5000V MODE
This function is performed in compliance with standard IEC/ EN61557-2.
The ADJUST mode allows the fine adjustment of the test voltage between 100 - 5000VDC.
WARNING
The instrument may be used on installations of overvoltage category CAT
IV 600V to earth with maximum voltage 600V between inputs. Do not
connect the instrument to installations with voltages exceeding the limit
values indicated in this manual. If these limit values are exceeded, the
operator may be exposed to electrical shocks and the instrument could get
damaged.
Always connect the measuring leads to the instrument and to the alligator
clips with the accessories disconnected from the system.
We recommend holding the alligator clip respecting the safety area marked
by the hand protection (see par. 4.3).
Fig. 5: Instrument connection
1.
Turn on the instrument by pressing the relevant key.
2.
Press the FUNC/ERASE MEM key to select the ADJUST function.
3.
The display shows a screen similar to
that reported here to the side, which
contains:
• the ADJUST function selected;
• the bar graph set to zero;
• the indication "--- TΩ";
• the test voltage;
• the value of the test time;
• the plug symbol (if the instrument is
supplied from the mains);
• the
battery
symbol
steadily
illuminated or flashing (if batteries
are flat or are being recharged);
• the timer symbol if the duration of
the test has been preset.
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4.
By pressing the arrow
keys, the instrument shows
a screen similar to that
reported here to the side,
which contains the value of
the input voltage.
5.
Make sure that the set test voltage is the desired one. Should it not be the case,
please refer to paragraph 4.7.1 to change it.
6.
Insert the measuring leads into the relevant input leads of the instrument -Rx, +Rx
and GUARD, if necessary (par. 4.4).
WARNING
Make sure that there is no voltage at the ends of the measuring points before
connecting them to the measuring leads.
7.
Connect the alligator clips to the part of the system to be tested.
8.
Press the START/STOP key to perform measurement.
WARNING
The display shows the message “Measuring…” which indicates that the
instrument is performing the measurement. During this whole phase:
• do not disconnect the measuring leads of the instrument from the
conductor being tested; the conductor could remain live at a dangerous
voltage because of possible stray capacitances in the circuit tested;
• never insert the plug of the supply cable into the Europlug socket.
9.
During measurement, the instrument
gives a short acoustic signal every
second and the display shows a
screen similar to that reported here to
the side, which contains:
• the ADJUST function selected;
• the bar graph proportional to the
measured resistance value;
• the numerical indication of the
measured resistance;
• the actual test voltage;
• the symbol of the alarm bell (if the measured value is not within the set limits
and/or if the value of the test voltage is lower than the set nominal value);
• the value of the test time elapsed or remaining (if a test has been set);
• the plug symbol (if the instrument is supplied from the mains);
• the battery symbol steadily illuminated or flashing (if batteries are flat or are being
recharged);
• the timer symbol if the duration of the test has been preset;
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• the two “flash” symbols to indicate a dangerous voltage;
• the message “MEASURING…”.
While measuring, it is also possible to display the leakage current, the D.A.R.
(Dielectric Absorption Ratio if test duration > 1 minute), the P.I. (Polarization Index if
test duration > 10 minutes) which cyclically show when pressing the arrow keys (see
note on P.I. and D.A.R. in par.11.1).
If no measuring time was set when setting the parameters or if you
want to stop the test in advance before the set time elapses, press the
START/STOP key.
10.
11a.
Once measurement is complete and
any capacitance has been discharged,
the instrument shows:
• the value of the measured
insulation resistance;
• the value of the generated voltage;
• the duration of the test.
If the measured resistance value is between the (MIN - MAX) limits previously set,
the instrument shows OK and gives a double acoustic signal.
Or
11b.
Once measurement is complete and
any capacitance has been discharged,
the instrument shows:
• the value of the measured
insulation resistance;
• the value of the generated voltage;
• the duration of the test.
If the measured resistance value is not between the (MIN - MAX) limits previously
set, the instrument shows NOT OK, the alarm bell and gives a long acoustic signal.
12.
Once measurement is complete, it is also possible to display the
leakage current, the D.A.R. (Dielectric Absorption Ratio), the P.I.
(Polarization Index) and the capacitance which cyclically show when
pressing the arrow keys (see note on P.I. and D.A.R. in par. 11.1).
If the measured resistance value < 5,0MΩ , the screen displaying the
capacitance shows three hyphens “---“, to indicate that it was
impossible to measure the capacitance, and the symbol
.
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WARNING
If, when scrolling the results obtained, the capacitance value is > 1nF, it is
recommended to repeat the measurement by activating the SMOOTH function
(par. 4.9).
13.
Measures can be saved by pressing the SAVE key twice (par. 5.1).
4.7.1. Configuration of the test parameters for ADJUST mode
a.
By cyclically pressing the SET/DISPLAY MEM key, it is
possible to select the following parameters:
• minimum value of the insulation resistance (MIN) in a
range between 0,01MΩ - MAX;
• maximum value of the insulation resistance (MAX) in a
range between (MIN) - 10TΩ;
• value of the test voltage in a range between 100V 5000V (can be set in steps of 25V up to 1000V and in
steps of 50V from 1000V to 5000V);
• test time value in a range between (00min:05sec) (99min:59 sec).
b.
Press the arrow keys to change the value of the
parameters (a long pressing of the keys allows a rapid
change of the values).
c.
Press the MODE/CLEAR SMOOTH key to remove the limit
values set for the parameters. The display shows the
message "no" to indicate that there is no limit set. Only
when setting the value of the test voltage, by pressing the
MODE/CLEAR SMOOTH key, the voltage sets to the
default value of 1000V.
d.
After setting, press the SAVE key to save the changes
made or press the ESC/RECALL MEM key to exit without
saving and return to the previous screen.
or
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4.8 RAMP MODE
This function is performed in compliance with standard IEC/ EN61557-2.
The RAMP mode allows choosing among three different types of ramps:
RAMP#1
RAMP#2
RAMP#3
For each type of ramp, it is possible to set the duration, the test voltage and the number of
times the ramp is repeated (par. 4.8.1, par. 4.8.2, par. 4.8.3).
RAMP#1:
RAMP#2:
RAMP#3:
Voltage starts from 0V, reaches the value V1 in a time interval ∆T, keeps the
value V1 for a time T1, and finally returns to 0 (with possible discharge of the
residual voltage).
Voltage starts from 0V, which is kept for a time T0, reaches the value V1 in a
time interval ∆T, and finally returns to 0 (with possible discharge of the
residual voltage).
Voltage starts from 0V, which is kept for a time T0, reaches the value V1 in a
time interval ∆T, keeps to value V1 for a time T1, and finally returns to 0 (with
possible discharge of the residual voltage).
WARNING
The instrument may be used on installations of overvoltage category CAT
IV 600V to earth with maximum voltage 600V between inputs. Do not
connect the instrument to installations with voltages exceeding the limit
values indicated in this manual. If these limit values are exceeded, the
operator may be exposed to electrical shocks and the instrument could get
damaged.
Always connect the measuring leads to the instrument and to the alligator
clips with the accessories disconnected from the system.
It is recommended to hold the alligator clip respecting the safety area
marked by the hand protection (par. 4.3).
Fig. 6: Instrument connection
1.
Turn on the instrument by pressing the relevant key.
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2.
Press the FUNC key to select the RAMP function.
3.
The display shows a screen similar to
that reported here to the side, which
contains:
• the RAMP type selected;
• the bar graph set to zero;
• the indication "--- TΩ";
• the set test voltage;
• the value of the test time;
• the plug symbol (if the instrument is
supplied from the mains);
• the
battery
symbol
steadily
illuminated or flashing (if batteries
are flat or are being recharged);
• the timer symbol if the duration of
the test has been preset.
4.
By pressing the arrow
keys,
the
instrument
shows a screen similar to
that reported here to the
side, which contains the
value of the input voltage.
5. Insert the measuring leads into the relevant input leads of the instrument -Rx, +Rx
and GUARD, if necessary (par. 4.4).
WARNING
Make sure that there is no voltage at the ends of the measuring points before
connecting them to the measuring leads.
6.
7.
Connect the alligator clips to the part of the system to be tested.
Press the START/STOP key to perform measurement.
WARNING
The display shows the message "Measuring..." which indicates that the
instrument is performing the measurement. During this whole phase:
• do not disconnect the measuring leads of the instrument from the
conductor being tested; the conductor could remain live at a dangerous
voltage because of possible stray capacitances in the circuit tested;
• never insert the plug of the supply cable into the Europlug socket.
EN - 18
HT7051
8.
During measurement, the instrument
gives a short acoustic signal every
second and the display shows a screen
similar to that reported here to the side,
which contains:
• the RAMP function selected;
• the bar graph proportional to the
measured resistance value;
• the numerical indication of the
measured resistance;
• the segment relevant to the current ramp point, flashing;
• the actual test voltage (relevant to the current ramp point);
• the symbol of the alarm bell (if the measured value is not within the set limits
and/or if the value of the test voltage is lower than the set nominal value);
• the value of the remaining test time (relevant to the current ramp point);
• the plug symbol (if the instrument is supplied from the mains);
• the battery symbol steadily illuminated or flashing (if batteries are flat or are being
recharged);
• the timer symbol;
• the two "flash" symbols to indicate a dangerous voltage;
• the message "MEASURING...".
While measuring, it is also possible to display the leakage current, the capacitance
the number N of the cycle the instrument is performing, which cyclically show when
pressing the arrow keys.
If you want to stop the test in advance before the set number N of
cycles is reached, press the START/STOP key.
9.
10a.
Once measurement is complete and
any capacitance has been discharged,
the instrument shows:
• the value of the measured insulation
resistance;
• the value of the actually generated
voltage V1;
• the value of the time relevant to
parameter T1.
If the measured resistance value is between the (MIN - MAX) limits previously set,
the instrument shows OK and gives a double acoustic signal.
Or
EN - 19
HT7051
10b.
Once measurement is complete and
any capacitance has been discharged,
the instrument shows:
• the value of the measured insulation
resistance;
• the value of the actually generated
voltage V1;
• the value of the time relevant to
parameter T1.
If the measured resistance value is not between the (MIN - MAX) limits previously
set, the instrument shows NOT OK, the alarm bell and gives a long acoustic signal.
11.
Once measurement is complete, it is also possible to display
the leakage current, the capacitance the number N of cycles
in which the set ramp was repeated, which cyclically show
when pressing the arrow keys.
If the measured resistance value < 5,0MΩ, the screen
displaying the capacitance shows three hyphens “---“, to
indicate that it was impossible to measure the capacitance,
and the warning triangle.
WARNING
If, when scrolling the results obtained, the capacitance value is > 1nF, it is
recommended to repeat the measurement by activating the SMOOTH function
(par. 4.9).
12.
Measures can be saved by pressing the SAVE key twice (par. 5.1).
EN - 20
HT7051
4.8.1. Configuration of the test parameters for RAMP#1 mode
a.
By cyclically pressing the SET/DISPLAY MEM key, it is
possible to select the following parameters:
• minimum value of the insulation resistance (MIN) in a
range between 0,01MΩ - MAX;
• maximum value of the insulation resistance (MAX) in a
range between (MIN) - 10TΩ;
• value of time interval ∆T, in which the test voltage
passes from 0V to the set value V1;
• value of the test voltage V1 in a range between 100V 5000V (can be set in steps of 25V up to 1000V and in
steps of 50V from 1000V to 5000V);
• value of time T1 in which the test voltage V1 is applied,
in a range between (00min:05sec) - (99min:59 sec);
• number N of cycles in which the ramp is repeated, in a
range between 1 - 255 (N=1 indicates 1 only test without
repetitions).
b.
Press the arrow keys to change the value of the parameters
(a long pressing of the keys allows a rapid change of the
values).
c.
Press the MODE/CLEAR SMOOTH key to remove the limit
values set for the parameters. The display shows the
message "no" to indicate that there is no limit set.
When setting the value of the time interval ∆T, of the test
voltage V1, of time T1 and of the number N of cycles, by
pressing the MODE/CLEAR SMOOTH key, the default
values are set (respectively 30sec, 1000V, 1min, 1 cycle).
d.
After setting, press the SAVE key to save the changes
made or press the ESC/RECALL MEM key to exit without
saving and return to the previous screen.
or
EN - 21
HT7051
4.8.2. Configuration of the test parameters for RAMP#2 mode
a.
By cyclically pressing the SET/DISPLAY MEM key, it is
possible to select the following parameters:
• minimum value of the insulation resistance (MIN) in a
range between 0.01MΩ - MAX;
• maximum value of the insulation resistance (MAX) in a
range between (MIN) - 10TΩ;
• value of the starting voltage V0 in a range between 100V
- 1000V (can be set in steps of 25V);
• value of time T0 in which the test voltage V0 is applied,
in a range between (00min:05sec) - (99min:59 sec);
• value of time interval ∆T in which the test voltage passes
from the set value V0 to the set value V1, in a range
between (00min:05sec) - (99min:59 sec);
• value of the test voltage V1 in a range between 1000V 5000V (can be set in steps of 50V);
• number N of cycles in which the ramp is repeated, in a
range between 1 - 255 (N=1 indicates 1 only test without
repetitions).
b.
Press the arrow keys to change the value of the parameters
(a long pressing of the keys allows a rapid change of the
values).
c.
Press the MODE/CLEAR SMOOTH key to remove the limit
values set for the parameters. The display shows the
message "no" to indicate that there is no limit set.
When setting the value of voltage V0, of time T0, of time
interval ∆T, of voltage V1 and of the number N of cycles, by
pressing the MODE/CLEAR SMOOTH key, the default
values are set (respectively 100V, 15sec, 30sec, 1000V, 1
cycle).
d.
After setting, press the SAVE key to save the changes
made or press the ESC/RECALL MEM key to exit without
saving and return to the previous screen.
or
EN - 22
HT7051
4.8.3. Configuration of the test parameters for RAMP#3 mode
a.
By cyclically pressing the SET/DISPLAY MEM key, it is
possible to select the following parameters:
• minimum value of the insulation resistance (MIN) in a
range between 0.01MΩ - MAX;
• maximum value of the insulation resistance (MAX) in a
range between (MIN) - 10TΩ;
• value of the starting voltage V0 in a range between
100V - 1000V (can be set in steps of 25V);
• value of time T0 in which the test voltage V0 is applied,
in a range between (00min:05sec) - (99min:59 sec);
• value of time interval ∆T in which the test voltage
passes from the set value V0 to the set value V1, in a
range between (00min:05sec) - (99min:59 sec);
• value of the test voltage V1 in a range between 1000V 5000V (can be set in steps of 50V);
• value of time T1 in which the test voltage V1 is applied,
in a range between (00min:05sec) - (99min:59 sec);
• number N of cycles in which the ramp is repeated, in a
range between 1 - 255 (N=1 indicates 1 only test
without repetitions).
b.
Press the arrow keys to change the value of the parameters
(a long pressing of the keys allows a rapid change of the
values).
c.
Press the MODE/CLEAR SMOOTH key to remove the limit
values set for the parameters. The display shows the
message "no" to indicate that there is no limit set.
When setting the value of voltage V0, of time T0, of time
interval ∆T, of voltage V1, of time T1 and of the number N
of cycles, by pressing the MODE/CLEAR SMOOTH key,
the default values are set (respectively 100V, 15sec, 30sec,
1000V, 1min, 1 cycle).
d.
After setting, press the SAVE key to save the changes
made or press the ESC/RECALL MEM key to exit without
saving and return to the previous screen.
or
EN - 23
HT7051
4.9
1.
ENABLE/DISABLE OF SMOOTH FUNCTION
With the instrument in normal mode (no SET of parameters), press and
hold the MODE/CLEAR SMOOTH key for approximately 3 seconds. On
the display, the word SMOOTH appears (or disappears, if already
displayed). This feature is suggested with very high capacitance loads
presence in order to improve the readings at display.
4.10 ANOMALOUS SITUATIONS IN ALL MODES
1.
If, upon pressing the START/STOP
key, the voltage at input leads -Rx, +Rx
is > allowable limit voltage, the
instrument gives a long acoustic signal
and displays the screen reported here
to the side for 3 seconds. Afterwards,
the instrument returns to the initial
screen.
2.
If, upon pressing the START/STOP key
(with nominal test voltage set to ≤
1000V and load resistance ≥ 5MΩ), the
capacitance at input leads -Rx, +Rx is >
allowable
limit
capacitance,
the
instrument gives a long acoustic signal
and displays the screen reported here
to the side for 3 seconds. Afterwards,
the instrument returns to the initial
screen.
3.
If, upon pressing the START/STOP key
(with 1000V < nominal test voltage set
≤ 2500V and load resistance ≥ 5MΩ),
the capacitance at input leads -Rx, +Rx
is > allowable limit capacitance, the
instrument gives a long acoustic signal
and displays the screen reported here
to the side for 3 seconds. Afterwards,
the instrument returns to the initial
screen.
EN - 24
HT7051
4.
If, upon pressing the START/STOP key
(with 2500V < nominal test voltage set
≤ 5000V and load resistance ≥ 5MΩ),
the capacitance at input leads -Rx, +Rx
is > allowable limit capacitance, the
instrument gives a long acoustic signal
and displays the screen reported here
to the side for 3 seconds. Afterwards,
the instrument returns to the initial
screen.
5.
If, upon pressing the START/STOP key
or if, while measuring, an insufficient
level of the supply battery voltage is
detected, so that the success of the test
is prejudiced, measurement does not
start or is stopped. The instrument
gives a long acoustic signal and
displays the screen reported here to the
side for 3 seconds. Afterwards, the
instrument returns to the initial screen.
6.
If there are no data saved in the
instrument’s memory, upon pressing
the ESC/RECALL MEM key, the
instrument gives a long acoustic signal
and displays the screen reported here
to the side for 3 seconds. Afterwards,
the instrument returns to the initial
screen.
7.
If there are no memory cells available
to save the measurement results, upon
pressing the SAVE key, the instrument
gives a long acoustic signal and
displays the screen reported here to the
side for 3 seconds. Afterwards, the
instrument returns to the initial screen.
8.
The above-mentioned anomalous situations cannot be saved.
EN - 25
HT7051
5 MANAGEMENT OF MEMORY DATA
5.1
1.
2.
3.
4.
5.2
1.
HOW TO SAVE MEASURES
After
performing
a
measurement, press the
SAVE key; the display
shows a screen similar to
that reported here to the
side, which contains:
• the number of the
memory location in which
the measure will be
saved;
• the last set value for
parameter P.
Should you desire to change the value of parameter P, press
the arrow keys to set the desired value (from 1 to 255). This
value helps remembering the location in which the
measurement considered has been performed.
Confirm measure saving by pressing the SAVE key.
Or
Press the ESC/RECALL MEM key to go back to the previous screen
without saving data in the memory.
HOW TO DELETE THE LAST OR ALL THE MEASURES SAVED IN THE
MEMORY
Press the ESC/RECALL
MEM key; the display shows
a screen similar to that
reported here to the side,
which contains:
• the number of the last
memory location used;
• the value of parameter P.
EN - 26
HT7051
2.
Press the FUNC/ERASE
MEM key; the instrument
displays a screen similar to
that reported here to the
side, which shows the word
LAST, to indicate that the
last measure saved will be
deleted.
3.
Press the arrow keys; the
instrument displays a screen
similar to that reported here
to the side, which shows the
word ALL, to indicate that all
the measures saved will be
deleted.
WARNING
Confirmation of data deletion means the deletion of the last or of all saved
data.
4.
5.
5.3
1.
2.
Confirm deletion by pressing the FUNC/ERASE MEM key.
Or
Press the ESC/RECALL MEM key to go back to the previous screen
without deleting data from the memory.
HOW TO RECALL MEASURES
Press the ESC/RECALL
MEM key; the display shows
a screen similar to that
reported here to the side,
which contains:
• the number of the last
memory location used;
• the value of parameter P.
Press the arrow keys to select the memory location whose
content is to be displayed.
EN - 27
HT7051
3.
4.
5.
Press the SET/DISPLAY
MEM key to display the
measure contained in the
selected memory location,
the display shows a screen
similar to that reported here
to the side.
By pressing the arrow keys it is also possible to cyclically
display (according to the mode in which the saved
measurement was performed) the leakage current, the D.A.R.
(Dielectric Absorption Ratio), the P.I. (Polarization Index), the
capacitance and the number N of cycles.
Press the ESC/RECALL MEM key to go back to the previous screen and
press the ESC/RECALL MEM key again to exit memory management.
6 RESET OF INSTRUMENT
1.
Turn on the instrument by pressing the relevant key.
2.
Press and hold the SET/DISPLAY MEM key. After approximately 10
seconds, the instrument is reset and turns off.
7 CONNECTION OF THE INSTRUMENT TO PC
The connection between the PC and the instrument is obtained by means of a serial port
and the C232NG1 cable, supplied with the software pack.
Before connection, it is necessary to select the COM port used for transmission by the PC
and the correct baud rate (9600). To set these parameters, launch the management
software and consult the program’s help on line.
WARNING
The selected port must NOT be used by other devices or applications (e.g.
mouse, modem, etc…).
The procedure for transferring saved data to a PC (after installing the data management
SW) can be schematized as follows:
1.
2.
3.
4.
turn on the instrument and wait for the initial screen to disappear;
connect the C232NG1 cable to the instrument and to a COM port of the PC;
launch the data management program on the PC;
follow the instructions of the software’s help on line.
EN - 28
HT7051
8 MAINTENANCE
8.1 GENERAL INFORMATION
The instrument You purchased is a precision instrument. During use and storage, carefully
observe the recommendations listed in this manual in order to prevent possible damage or
dangers during use.
Do not use the instrument in environments with high humidity levels or at high
temperatures. Do not directly expose to sunlight.
Always turn off the instrument after use.
Never remove the front panel of the instrument. The instrument don’t need any particular
maintenance.
8.2 CLEANING THE INSTRUMENT
To clean the instrument, use a soft dry cloth. Never use humid cloths, solvents, water, etc.
8.3
END OF LIFE
Warning: the reported symbol indicates that the appliance and its accessories
must be disposed of separately and treated correctly.
EN - 29
HT7051
9 TECHNICAL SPECIFICATIONS
9.1 DEFINITION
Guidelines IEC/EN61557-5 defines the Intrinsic uncertainty and the Operating uncertainty.
The Intrinsic uncertainty is the uncertainty of a measuring instrument or supply instrument
when used under reference conditions. The operating instrumental uncertainty is the
instrumental uncertainty under the rated operating conditions. The maximum percentage
operating error within the measurement range does not exceed ± 30 % with the measured
value as fiducial value, as determined in accordance with the following TABLE:
Intrinsic uncertainty
or influence quantity
Reference conditions or specified
operating range
Designation code
Intrinsic uncertainty
Reference conditions
Position
Reference position ± 90°
Supply voltage
At the limits stated by the manufacturer
Temperature
0 °C and 35 °C
Operating
B = ± A + 1,15 E12 + E 22 + E32
uncertainty
A = intrinsic uncertainty
En = variations
R = routine test
T = type test
)
(
A
E1
E2
E3
Requirements or test in
Type
accordance with the
of
relevant parts of IEC
test
61557
Part 5, 6.1
Part 1, 4.2
Part 1, 4.2, 4.3
Part 1, 4.2
R
R
R
T
Part 5, 4.3
B[%] = ±
B
× 100
Fiducial Value.
9.2 TECHNICAL SPECIFICATIONS
Vdc
Range
10 ÷ 600V
Resolution
1V
Uncertainty
±(2.0% rdg+2 digits)
Protection against overloads
CAT IV 600V to earth
Resolution
1V
Uncertainty
±(2.0% rdg+2 digits)
Protection against overloads
CAT IV 600V to earth
Vac TRMS
Range
10 ÷ 600V
Resistance measurement – Intrinsic Uncertainty (*)
Range
0.01MΩ ÷ 0.19MΩ (***)
0.20MΩ ÷ 199GΩ
0.20MΩ ÷ 499GΩ
0.20MΩ ÷ 999GΩ
0.20MΩ ÷ 1.99TΩ
0.20MΩ ÷ 4.99TΩ
0.20MΩ ÷ 9.99TΩ
Test voltage
≥ 100V
≥ 100V
≥250V
≥500V
≥1000V
≥2500V
5000V
Resolution
Intrinsic Uncertainty (**)
±(5% lett.+7 digits)
±(5% rdg+3 digits) if Rmis ≤
Test Voltage
5nA
±(20% rdg+3 digits) if Rmis >
Test Voltage
5nA
≤ 1% rdg
(*) Intrinsic Uncertainty indicates also Base accuracy
(**) Load Capacitive < 1nF
(***) Outside range indicated by IEC / EN61557
Resistance measurement – Operating Uncertainty
Range
0.01MΩ ÷ 0.19MΩ (***)
0.20MΩ ÷ 199GΩ
0.20MΩ ÷ 499GΩ
0.20MΩ ÷ 999GΩ
0.20MΩ ÷ 1.99TΩ
0.20MΩ ÷ 4.99TΩ
0.20MΩ ÷ 9.99TΩ
Test voltage
≥ 100V
≥ 100V
≥250V
≥500V
≥1000V
≥2500V
5000V
Resolution
Operating Uncertainty (**)
±(12% lett.+7 digits)
±(12% rdg+3 digits) if Rmis ≤
Test Voltage
5nA
±(20% rdg+3 digits) if Rmis >
Test Voltage
5nA
≤ 1% rdg
(**) Load Capacitive < 1nF
(***) Outside range indicated by IEC / EN61557
EN - 30
HT7051
Fiducial Value (according EN61557)
Range
[V], [Ω]
100, 15G
100,150G
500, 100G
500, 1T
5000, 1T
5000, 8T
Fiducial
values
[Ω]
15.33G
146.47G
97.08G
979.7G
979.7G
7.576G
Read.
[Ω]
15.2G
146G
98.3G
951G
955G
7.07T
Operating Uncertainty
B
Influence Quantity
E1
E2
E3
[Ω]
[Ω]
[Ω]
0.0G
0.1G
1.1G
1G
3G
12G
0.3G
0.4G
6.7G
-4G
15G
79G
-10G
4G
75G
-0.05T
0.06T
0.58T
Intrinsec
Uncertainty A
[%]
[Ω]
-0.13G
-0.8%
-0.47G
-0.3%
1.22G
1.3%
-28.7G
-2.9%
-24.7G
-2.5%
-0.506G
-6.7%
[Ω]
1.40G
14.74G
8.95G
121.29G
111.83G
1.18T
[%]
9.1
10.1
9.2
12.4
11.4
15.5
For the meanings of the items see 9.1
Measurement of generated voltage (*)
Test mode
FIX
Nominal test voltages
100V, 250V, 500V, 1kV, 2.5kV, 5kV
100 ÷ 1000V, step 25V
1000 ÷ 5000V, step 50V
100 ÷ 1000V, step 25V
1000 ÷ 5000V, step 50V
ADJUSTABLE
RAMP
Uncertainty
-0%, +10% + 15V
(*) Test voltage compliant with IEC /EN 61557-2
Test current
Test voltage
100 ÷ 5000V
Test current
1mA ≤ Test current ≤ 3mA (*)
(*) Automatically controlled test current.
Test time
Setting range
5s – 99min 59s
Resolution
1s
Capacitance measurement
Range
1nF ÷ 999nF
1.00uF ÷ 5.00uF
1nF ÷ 999nF
1.00uF ÷ 9.99uF
10.0uF ÷ 19.9uF
1nF ÷ 999nF
1.00uF ÷ 9.99uF
10.0uF ÷ 49.9uF
Resolution
1nF
0.01uF
1nF
0.01uF
0.1uF
1nF
0.01uF
0.1uF
Load resistance
Test voltage (Vn)
Uncertainty
Vn ≤ 5000V
≥ 5MΩ
Vn ≤ 2500V
±(10% rdg+5 digits)
Vn ≤ 1000V
Condensator charge time (0V 5000V): < 3s x 1µF
Condensator discharge time (5000V 25V): < 5s x 1µF
Leakage current
Range
0.1nA ÷ 99.9nA
100nA ÷ 999nA
1.00uA ÷ 9.99uA
10.0uA ÷ 9.99uA
100uA ÷ 999uA
1.00mA ÷ 2.5mA
Resolution
0.1nA
1nA
0.01uA
0.1uA
1uA
0.01mA
Uncertainty
±(7% rdg+3 digits) if Rmis ≤
Test Voltage
5nA
±(22% rdg+3 digits) if Rmis >
Test Voltage
5nA
P.I. – D.A.R.
Range
0.01 ÷ 9.99
Resolution
Uncertainty (*)
±(5% rdg+3 digits) if Rmis ≤
Test Voltage
5nA
±(20% rdg+3 digits) if Rmis >
Test Voltage
5nA
0.01
(*) Load capacitance < 1nF
EN - 31
HT7051
9.3 SAFETY STANDARDS
Instrument safety:
Technical documentation:
Measuring accessory safety:
Insulation:
Protection:
Polluting level:
Overvoltage category:
Maximum altitude:
IEC / EN61010-1, IEC / EN61557-1, IEC / EN61557-2
IEC / EN61187
IEC / EN61010-031
Class 2, double insulation
IP40 (open case), IP53 (closed case) according to IEC
/ EN60529
2
CAT IV 600V (to earth), max 600V between inputs
2000m (6561ft)
9.4 GENERAL CHARACTERISTICS
Mechanical characteristics
Dimensions:
Approximately:
Weight:
Power supply
Power Supply:
Fuse:
Low battery indication:
Battery life:
Auto power off:
Display
Characteristics:
Approximately:
360(L) x 310(W) x 195(H) mm
14.2”(L) x 12.2”(W) x 7.7”(H)
3.5 kg
7.8 lb
Mains: 220-240V~, 50-60Hz, 20VA
Battery Type: Internal rechargeable NiMH battery
T 200mA H 250V, Ir:1,5kA
The display shows the low battery symbol permanently
on
when the voltage supplied by the batteries is
too low. While no measurement is being performed,
insert the power supply cable into the Europlug socket
to start recharging the battery. With the batteries
charging it is possible to perform measurements.
>1000 Test @ 5kV on 5MΩ (Test time: 5sec, delay
between 2 test: 25sec) according IEC / EN61557-2.
(par. 6.7)
It activates after 5 minutes since the last selection,
measurement or control received from the PC
Backlighted LCD screen with three contemporary
readings:
Group 1 (main): insulation resistance, leakage current,
PI, DAR, capacitance
Group 2: test voltage (nominal and generated)
Group 3: test time
Memory
Characteristics:
700 memory locations
Connection to the PC
Serial interface:
RS-232, internally optoinsulated (9600bps, 8, 1, N)
EN - 32
HT7051
9.5 ENVIRONMENT
9.4.1. Environmental conditions for use
Reference temperature:
23 ± 5°C
73.4 ± 41.0°F
Operating temperature:
0 ÷ 40°C
32.0 ÷ 104.0°F
Allowable relative humidity:
<80%
Storage temperature:
-10 ÷ 60°C
14.0 ÷ 140.0°F
Storage humidity:
<80%
9.4.2. EMC
This instrument has been designed in compliance with EMC standards and its
compatibility has been tested according to IEC / EN61326-1 and IEC / EN61326-2-2.
Classe A:
compatible
Classe B:
compatible with the following exception:
- don’t not use power supplì cable (battery charging – the instrument
could emit electrical noise and create interference)
where:
Class A equipment: Equipment suitable for use in all establishments other than domestic
and those directly connected to a low-voltage power supply network which supplies
buildings used for domestic Purposes.
Class B equipment: equipment suitable for use in domestic establishments and in
establishments directly connected to a low-voltage power supply network which supplies
buildings used for domestic purposes.
This instrument complies with the requirements of European Directive on low
voltage 2006/95/EC (LVD) and of Directive EMC 2004/108/EC
9.6 ACCESSORIES
See enclosed packing list.
EN - 33
HT7051
10 SERVICE
10.1 WARRANTY CONDITIONS
This instrument is warranted against any material or manufacturing defect, in compliance
with the general sales conditions. During the warranty period, defective parts may be
replaced. However, the manufacturer reserves the right to repair or replace the product.
Should the instrument be returned to the After-sales Service or to a Dealer, transport will
be at the Customer's charge. However, shipment will be agreed in advance.
A report will always be enclosed to a shipment, stating the reasons for the product’s return.
Only use original packaging for shipment; any damage due to the use of non-original
packaging material will be charged to the Customer.
The manufacturer declines any responsibility for injury to people or damage to property.
The warranty shall not apply in the following cases:
• Repair and/or replacement of accessories and battery (not covered by warranty).
• Repairs that may become necessary as a consequence of an incorrect use of the
instrument or due to its use together with non-compatible appliances.
• Repairs that may become necessary as a consequence of improper packaging.
• Repairs which may become necessary as a consequence of interventions performed
by unauthorized personnel.
• Modifications to the instrument performed without the manufacturer’s explicit
authorization.
• Use not provided for in the instrument’s specifications or in the instruction manual.
The content of this manual cannot be reproduced in any form without the manufacturer’s
authorization.
Our products are patented and our trademarks are registered. The manufacturer
reserves the right to make changes in the specifications and prices if this is due to
improvements in technology.
10.2 SERVICE
If the instrument does not operate properly, before contacting the After-sales Service,
please check the conditions of battery and cables and replace them, if necessary.
Should the instrument still operate improperly, check that the product is operated
according to the instructions given in this manual.
Should the instrument be returned to the After-sales Service or to a Dealer, transport will
be at the Customer's charge. However, shipment will be agreed in advance.
A report will always be enclosed to a shipment, stating the reasons for the product’s return.
Only use original packaging for shipment; any damage due to the use of non-original
packaging material will be charged to the Customer.
EN - 34
HT7051
11 THEORETICAL APPENDIX
11.1 P.I. (POLARIZATION INDEX) AND D.A.R. (DIELECTRIC ABSORPTION RATIO)
The P.I. is defined as the relationship between the resistance value measured after 10
minutes and the value measured after 1 minute after applying the test voltage. Therefore,
it is an indicator of the good quality of the insulating material. A less precise evaluation, but
equally indicative of the characteristics of the insulating material, is the relationship
between the resistance values measured after approximately 60 seconds and 30 seconds
(D.A.R.). After one minute it is already possible to check if the resistance value has
increased significantly, as is desirable, o if it has remained unchanged or, worse, it has
decreased.
This measuring method, as it is based on a relationship between resistances, gives a nondimensional result, which is therefore independent from the physical dimension of the
measured appliance.
Insulation condition
Dangerous
Scarce
Good
Excellent
P.I.
───
1.0 ÷ 1.25
1.4 ÷ 1.6
Above 1.6
EN - 35
D.A.R.
Under 1
1.0 ÷ 2
2÷4
Above 4
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