HT HT9020 User Manual

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Copyright HT ITALIA 2016 Release 1.02 - 01/03/2016
HT9020
User manual
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HT9020
EN - 1
Table of contents:
1. PRECAUTIONS AND SAFETY MEASURES ........................................................................... 2
1.1. Preliminary instructions .................................................................................................................... 2
1.2. During use ........................................................................................................................................ 3
1.3. After use ........................................................................................................................................... 3
1.4. Definition of measurement (overvoltage) category .......................................................................... 3
2. GENERAL DESCRIPTION ....................................................................................................... 4
2.1. Measuring average values and TRMS values ................................................................................. 4
2.2. Definition of true root mean square value and crest factor .............................................................. 4
3. PREPARATION FOR USE ....................................................................................................... 5
3.1. Initial checks ..................................................................................................................................... 5
3.2. Instrument power supply .................................................................................................................. 5
3.3. Calibration ........................................................................................................................................ 5
3.4. Storage ............................................................................................................................................. 5
4. OPERATING INSTRUCTIONS ................................................................................................. 6
4.1. Instrument description ...................................................................................................................... 6
4.1.1. Description of the controls ................................................................................................................. 6
4.1.2. Alignment marks ................................................................................................................................ 6
4.1.3. Hand protection ................................................................................................................................. 7
4.1.4. Indication of the conventional direction of Current ............................................................................. 7
4.2. Function keys description ................................................................................................................. 8
4.2.1. F1, F2, F3, F4/OK keys ..................................................................................................................... 8
4.2.2. H/ESC/ key .................................................................................................................................... 8
4.3. Initial screen ..................................................................................................................................... 8
5. OPERATING INSTRUCTIONS ................................................................................................. 9
5.1. Instrument settings ........................................................................................................................... 9
5.2. AC Voltage detection ........................................................................................................................ 9
5.3. DC Voltage measurement .............................................................................................................. 10
5.4. AC/AC + DC Voltage measurement ............................................................................................... 12
5.4.1. Voltage Harmonics measurement ................................................................................................... 14
5.4.2. Phase Sequence and Phase Conformity ......................................................................................... 15
5.5. DC Current measurement .............................................................................................................. 19
5.6. AC/AC + DC Current measurement ............................................................................................... 21
5.6.1. Current Harmonics measurement .................................................................................................... 23
5.6.2. Dynamic Inrush current measurement ............................................................................................. 24
5.7. DC Power and Energy measurement ............................................................................................ 26
5.8. AC/AC+DC Power and Energy measurement ............................................................................... 30
5.9. Resistance and Continuity test measurement ............................................................................... 36
6. MAINTENANCE ...................................................................................................................... 39
6.1. General information ........................................................................................................................ 39
6.2. Battery replacement ....................................................................................................................... 39
6.3. Cleaning the instrument ................................................................................................................. 39
6.4. End of life ....................................................................................................................................... 39
7. TECHNICAL SPECIFICATIONS ............................................................................................. 40
7.1. Technical characteristics ................................................................................................................ 40
7.1.1. Reference guidelines ....................................................................................................................... 42
7.1.2. General characteristics .................................................................................................................... 42
7.2. ENVIRONMENT ............................................................................................................................. 42
7.2.1. Environmental conditions for use ..................................................................................................... 42
7.3. Accessories provided ..................................................................................................................... 42
8. SERVICE ................................................................................................................................ 43
8.1. Warranty conditions ........................................................................................................................ 43
8.2. Service ........................................................................................................................................... 43
9. APPENDIX – THEORETICAL OUTLINE ................................................................................ 44
9.1. Calculation of powers in “AC 1P” mode ......................................................................................... 44
9.2. Calculation of powers in “AC 3P” mode ......................................................................................... 44
9.3. Calculation of powers in “DC” mode .............................................................................................. 44
9.4. voltage and current harmonics ....................................................................................................... 45
9.5. Limit values for harmonics ............................................................................................................. 46
9.6. Causes FOR the presence of harmonics ....................................................................................... 46
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HT9020
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1. PRECAUTIONS AND SAFETY MEASURES
The instrument has been designed in compliance with directive IEC/EN61010-1 relative to electronic measuring instruments. For your safety and in order to avoid damaging the instrument, please carefully follow the procedures described in this manual and read all
notes preceded by the symbol paying the utmost attention.
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 measurement in case of gas, explosive and inflammable materials
or dusty environments
Avoid contact with the circuit under test if no measurement is carried out Avoid contact with exposed metal parts, with unused measuring probes, circuits, etc. Do not carry out any measurement in case of instrument’s anomalies such as
deformation, breaks, substance leaks, absence of displayed screen, etc.
Pay special attention when measuring voltages higher than 20V, since a risk of
electrical shock exists
The following symbols are used in this manual and on the instrument:
CAUTION: observe the instructions given in this manual; an improper use could damage the instrument or its components.
High voltage danger: electrical shock hazard.
Double-insulated meter
AC voltage or current
DC voltage or current
Connection to earth
1.1. PRELIMINARY INSTRUCTIONS
This clamp has been designed for use in environments of pollution degree 2. It can be used for CURRENT and VOLTAGE measurements on installations with
measurement category CAT IV 600V and CAT III 1000V. For a definition of measurement categories, see § 1.4.
We recommend to follow the standard safety rules devised by the procedures for
carrying out operations on live systems and using the prescribed PPE to protect the user against dangerous currents and the instrument against incorrect use.
Only the leads supplied with the instrument guarantee compliance with the safety
standards. They must be under good conditions and replaced with identical models, when necessary.
Do not test circuits exceeding the specified current and voltage limits. Check that the battery is correctly inserted. Before connecting the test leads to the circuit under test, make sure that the switch is
correctly set.
Make sure that the LCD display and the switch indicate the same function.
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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 activating the switch, remove the conductor from the clamp jaw or disconnect
the test leads from the circuit under test.
When the instrument is connected to the circuit, do not touch any unused terminal. Keep your hands always under the hand protection. This protection is always located in
a suitable position to guarantee a correct safety distance from possible exposed or live parts (see Fig. 3)
Avoid measuring resistance if external voltages are present. Even if the instrument is
protected, excessive voltage could cause a malfunction of the clamp.
During current measurement, any other current near the clamp may affect
measurement accuracy.
When measuring current, always put the conductor as close as possible to the middle
of the clamp jaw, to obtain the most accurate reading.
While measuring, if the value or the sign of the quantity under test remain unchanged,
check if the HOLD function is enabled.
1.3. AFTER USE
When measurement is complete, switch OFF the instrument. If the instrument is not to be used for a long time, remove the batteries
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 measurement category, commonly called overvoltage category. In § 6.7.4: Measured circuits, circuits are divided into the following measurement categories:
(OMISSIS)
Measurement category IV is for measurements performed at the source of the 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 the fixed installation, and equipment for industrial use and some other equipment, for example, stationary motors with permanent connection to fixed installations.
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
The HT9020 instrument carries out the following measurements:
DC and AC+DC TRMS voltage DC and AC+CD TRMS current Phase sequence and conformity test AC powers and power factor on single-phase and/or balanced three phase systems AC energies on single-phase and/or balanced three-phase systems DC power AC voltage harmonics up to 25° order and THD% AC current harmonics up to 25° order and THD% Frequency on voltage (with test leads) and current (with clamp jaw) Resistance and continuity test Electric motor starting currents (Dynamic Inrush) Detection of AC voltage with and without contact with built-in sensor
Each of these functions can be selected using the 6-position selector switch, including
OFF position. Keys F1, F2, F3, F4/OK and H / ESC /
are also provided. For their use,
please refer to § 4.2.
2.1. MEASURING AVERAGE VALUES AND TRMS VALUES
Measuring instruments of alternating quantities are divided into two big families:
AVERAGE-VALUE meters: instruments measuring the value of the single wave signals TRMS (True Root Mean Square) VALUE meters: instruments measuring the TRMS
value of the quantity being tested
In the presence of a perfectly sinusoidal wave, both families of instruments provide identical results. In the presence of distorted waves, on the other hand, the readings shall differ. Average-value meters provide the RMS value of the sole fundamental wave, TRSM meters, instead, provide the RMS value of the whole wave, including harmonics (within the instrument’s bandwidth)
2.2. DEFINITION OF TRUE ROOT MEAN SQUARE VALUE AND CREST FACTOR
The root mean square value of current is defined as follows: "In a time equal to a period, an alternating current with a root mean square value of the intensity of 1A, circulating on a resistor, dissipates the same energy as that which would have been dissipated by a direct current with the intensity of 1 A during the same time ". This definition results in the
numeric expression:
G=
Tt
t
dttg
T
0
0
)(
1
2
The root mean square value is indicated with the acronym RMS. The
Crest Factor is defined as the relationship between the Peak Value of a signal and its RMS
value: CF (G)=
RMS
p
G
G
This value changes with the signal waveform, for a purely sinusoidal
wave it is 2 =1.41. In case of distortion, the Crest Factor takes higher values as wave
distortion increases.
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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 generally checking the instrument in order to detect possible damage suffered during transport. In case anomalies are found, immediately contact the forwarding agent.
We also recommend to check whether the package contains all components indicated in
§ 7.3. In case of discrepancy, please contact the Dealer.
In case the instrument should be replaced, please carefully follow the instructions given in chapter 8.2.
3.2. INSTRUMENT POWER SUPPLY
The instrument is supplied by 2x1.5V LR03 AAA batteries. Replace them following the instructions in § 5.2.
3.3. CALIBRATION
The instrument has the technical specifications described in this manual. The instrument’s performance is guaranteed for one year.
3.4. STORAGE
In order to guarantee accurate measurements, after a long storage time under extreme environmental conditions, wait for the instrument to come back to normal condition (see §
7.2.1)
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4. OPERATING INSTRUCTIONS
4.1. INSTRUMENT DESCRIPTION
4.1.1. Description of the controls
CAPTION:
1. Inductive clamp jaw
2. AC voltage indicator LED
3. Jaw trigger
4. Rotary selector switch
5. H/ESC/ key
6. F1,F2,F3,F4/OK function
keys
7. LCD display
8. Input terminal V
9. Input terminal COM
Fig. 1: Instrument description
4.1.2. Alignment marks
Put the conductor as close as possible to the middle of the jaws on the intersection of the indicated marks (see Fig. 2) in order to meet the meter accuracy specifications.
CAPTION:
1. Alignment marks
2. Conductor
Fig. 2: Alignment marks
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4.1.3. Hand protection
CAPTION:
1. Hand protection
2. Safe area
Fig. 3: hand protection
Always keep your hands under the hand protection. This protection is always located in a suitable position to guarantee a correct safety distance from possible exposed or live parts (see Fig. 3)
4.1.4. Indication of the conventional direction of Current
The Fig. 4 shows an arrow which indicates the conventional direction of current
Fig. 4: Current direction arrow
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4.2. FUNCTION KEYS DESCRIPTION
4.2.1. F1, F2, F3, F4/OK keys
The F1, F2, F3, F4/OK keys perform different functions according to the measurement set
(for detailed information, see the single functions).
4.2.2. H/ESC/ key
A single press activates the Data HOLD function and the value of the measurement
quantity is frozen at display. The symbol "H" is displayed when this function is enabled. This operating mode is disabled when “H” key is pressed again or the switch is operated.
To improve the readability of the values measured in dark places, the display has been
provided with a backlight function which is turned on and off by long-pressing “H” key. If
the feature is set in MAN mode (see § 5.1) the backlight deactivates after approximately 30 seconds after its activation, in order to save battery life.
The same key identify the ESC (Exit) functionality inside the different modes of the
instrument.
4.3. INITIAL SCREEN
When switching on the instrument, the initial screen appears for a few seconds. It shows:
The instrument’s model The instrument’s serial number The instrument’s firmware version
HT9020
Sn 15120020
V. 2.00
CAUTION
Please note down this information, especially the firmware version, in case it should be necessary to contact the service department.
After a few seconds, the instrument switches to the selected function.
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5. OPERATING INSTRUCTIONS
5.1. INSTRUMENT SETTINGS
By positioning the selector switch to “Settings”, the screen aside
will appear, containing the possible settings of the instrument.
Press F1 (Sel) key to see the different selections. Press F2, F3 (, ) keys to modify the settings of the selected items and F4 (OK) key to confirm the selections.
Sel
OK
Language: English Auto-Off: OFF Backlight: MAN
Language
In the “Language” section it is possible to set the system language. Press F2, F3 (, ) keys for the selection of the available languages and F4 (OK) key to confirm the selected
item. The “Saved data” message is displayed for a while in the bottom part of display.
Auto - Off
In the “Auto - Off” section it is possible to activate/deactivate the auto power off feature. Press F2, F3 (, ) keys for the selection of the “ON” or “OFF” options and F4 (OK) key
to confirm the selected item. The “Saved data” message is displayed for a while in the bottom part of display. The “ symbol is displayed with auto power off feature activated and the instrument switches off after approx.. 5 minutes of idleness.
Backlight
In the “Backlight” section it is possible to select the activation mode of display backlight. Press F2, F3 (, ) keys for the selection of the “MAN” option (backlight manually activated by pressing “H” key and disable after approx. 30 seconds) or “ON” (backlight always active) and F4 (OK) key to confirm the selected item. The “Saved data” message is
displayed for a while in the bottom part of display. The “ON” option can result a significant reduction of the battery life.
5.2. AC VOLTAGE DETECTION
With the selector switch set to “V ” by taking the end of the clamp jaw near an AC source,
the red LED at the base of the clamp jaw will turn on (see Fig. 1 – part 2), which indicates
that voltage is present.
CAUTION
Phase detection is active only when the clamp selector switch is set to “V ”
position
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5.3. DC VOLTAGE MEASUREMENT
CAUTION
The maximum DC or AC+DC input voltage is 1000V. When the display
shows “> 999.9V”, it means that the maximum value that clamp is capable
of measuring has been exceeded. Exceeding these limits could result in electrical shocks to the user and damage to the instrument.
Fig. 5: DC Voltage measurement
1. By positioning the selector switch to “V ”, the screen aside
will appear
Mod Har Fnc
AC <42.5 Hz
---- V
2. Press F1 (Mod) key to open the drop-down menu shown on the screen nearby and select the “DC” option with the same
key
3. Press the F4 (OK) to confirm
Mod Har Fnc OK
AC <42.5 Hz
---- V
AC
DC
Ph Seq Help
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4. Connect red cable to input lead V and black cable to input lead COM then position
the leads at the desired points of the circuit under test (see Fig. 5)
5. The screen shows an example of DC Voltage measurement.
Mod Fnc
DC
9.1 V
6. Press F3 (Fnc) key to open the drop-down menu shown on the screen nearby. At each subsequent pressure of F3 key,
the cursor will scroll through the available items, as follows:
Max: it constantly displays the maximum value of the
measured DC Voltage
Min: it constantly displays the minimum value of the
measured DC Voltage
Cr+: it constantly displays the maximum positive crest
value
Cr-: it constantly displays the minimum negative crest
value
RST: (RESET) it deletes all stored Max, Min, Cr+ and Cr-
values and re-start with a new measure
ESC: it goes back from Max/Min/Cr+/Cr- and return to
normal measuring mode
Mod Fnc OK
DC
9. V
7. By pressing F4 (OK), the selected item is confirmed. Nearby
an example of measurement with active Max function. The “Max” symbol indicates the active function
Mod Fnc
Max DC
12.0 V
8. For the use of HOLD and backlight feature see § 5.1
CAUTION
The measurement of the 4 Max, Min, Cr+ and Cr- values is simultaneous, regardless of the displayed value.
Max
Min Cr+ Cr­RST Esc
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5.4. AC/AC + DC VOLTAGE MEASUREMENT
CAUTION
The maximum AC/AC+DC input voltage is 1000V. When the display shows
“> 999.9V”, it means that the maximum value which clamp is capable of
measuring has been exceeded. Exceeding these limits could result in electrical shocks to the user and damage to the instrument.
Fig. 6: AC/AC + DC voltage measurement
1. By positioning the selector switch to “V ”, the screen nearby
will appear
Mod Har Fnc
AC <42.5 Hz
---- V
2. Press F1 (Mod) to open the drop-down menu shown on the screen aside and select the “AC” option with the same key
3. Press F4 (OK) to confirm
Modd Har Fnc OK
AC <42.5 Hz
---- V
AC
DC Ph Seq Help
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4. Connect red cable to input lead V and black cable to input lead COM then position
the leads to the desired points of the circuit under test (see Fig. 6)
5. The screen shows an example of AC voltage measurement. The instrument allows the evaluation of possible DC components overlapped on a generic alternate waveform (AC+DC) signal and this can be very useful for the measurements on impulsive signals typically of no-linear loads (e.g: welders, electric ovens, etc)
Mod Har Fnc
AC 50.0 Hz
230.1 V
6. Press F3 (Fnc) to open the drop-down menu shown on the screen aside. At each subsequent pressure of key F3, the
cursor will scroll through the available items, as follows:
Max: it constantly displays the maximum value of the
measured AC+DC Voltage
Min: it constantly displays the minimum value of the
measured AC+DC Voltage
Cr+: it constantly displays the maximum positive crest
value
Cr-: it constantly displays the minimum negative crest
value
RST: (RESET) it deletes all stored Max, Min, Cr+ and Cr-
values and re-start with a new measure
Esc: it goes back from Max/Min/Cr+/Cr- and return to
normal measuring mode
Mod Har Fnc OK
AC
23. V
CAUTION
Note: the measurement of the 4 Max, Min, Cr+ and Cr- values is simultaneous, regardless of the displayed value.
7. By pressing F4 (OK), the selected item is confirmed. Nearby,
an example of measurement with active Max function.
Mod Har Fnc
Max AC 50.0 Hz
231.5 V
8. For the use of HOLD and backlight features see § 5.1
Max
Min Cr+ Cr­RST Esc
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5.4.1. Voltage Harmonics measurement
1. Press F2 (Har) key to select the screen of voltage harmonics as shown nearby. Press again F2 (RMS) to go back to
voltage measurement screen
Mod Har Fnc OK
AC 50.0 Hz
220.5 V
2. By pressing F1 (◄) or F4 (►), it is possible to move the
cursor over the graph and select the harmonic to be measured. The correspondent absolute or percentage value of harmonic voltage is shown. It is possible to measure up to the 25th harmonic
RMS Fnc
H01 215.0 V ThdV 10.0 %
3. While measuring Voltage Harmonics, press F3 (Fnc) to open
the drop-down menu shown on the screen aside. At each
subsequent pressure of F3, the cursor will scroll through the
available items, as follows:
Max: it constantly displays the maximum RMS value of
the selected current harmonic
Min: it constantly displays the minimum RMS value of the
selected current harmonic
Abs: it displays the absolute value of the harmonics in
Volts
%: it displays the value of the harmonics as percentage
value with respect to the fundamental
RST (RESET) it deletes all stored Max, Min values and
re-start with a new measure
Esc: it goes back to a normal measuring mode
Par Fnc
H01 215.0 V ThdV 10.0 %
CAUTION
Since the menu contains functions with a different meaning (Max-Min and Abs-%), it is necessary to enter the menu twice: first for displaying Abs or % values and second time to enable the Max or Min functions
4. By pressing F4 (OK), the selected item is confirmed. Nearby,
an example of measurement with active Max function. The display shows the active function.
RMS Fnc
H01 215.0 V ThdV 10.0 %
Max
5. For the use of HOLD and backlight features see § 5.1
Max
Min Abs % RST Esc
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5.4.2. Phase Sequence and Phase Conformity
CAUTION
While measuring, the instrument must be held in the operator’s hand.
Phase sequence test
Fig. 7: Verification of phase sequence
1. Press F1 (Mod) to open the drop-down menu shown on the screen nearby and select the “Ph Seq” option with the same
key
2. Press F4 (OK) to confirm
Mod OK
AC <42.5 Hz
---- V
3. The instrument shows the “PH1” message and waits for the
detection of L1 phase
4. Connect red cable to input lead V and black cable to input lead COM then position the leads respectively to the L1
phase and the ground reference PE of the circuit under test (see Fig. 7).
Mod
Ph Seq
PH1
Wait
AC DC
Ph Seq
Help
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CAUTION
If the frequency of the measured voltage is lower than 42.5Hz or higher than 69Hz, the display shows the message “F<42.5 Hz” or “F>69 Hz” and phase detection does not start.
5. When a voltage higher than or equal to 100V is detected, the instrument emits a sound signal (buzzer) and the message
Meas” is displayed. Do not press any key and keep the test
lead connected to L1 phase cable.
Mod
Ph Seq
PH1
Meas
6. Once phase L1 acquisition is complete, the instrument stops
the acoustic signal and the “Discon.” Message is shown.
Disconnect the test lead from phase L1 cable.
Mod
Ph Seq
Discon.
Wait
7. The message “PH2“ is shown and the instrument waits for
the detection of L2 phase. Connect the test lead to phase L2 cable (see Fig. 7)
Mod
Ph Seq
PH2
Wait
CAUTION
If more than 3 seconds elapse before detecting phase L2, the instrument
displays the message “Time Out”. It is necessary to repeat the measuring cycle from the beginning, by pressing F3 (New) and starting again from point
3.
8. When a voltage higher than or equal to 100V is detected, the instrument emits a sound signal (buzzer) and the message
Meas” is displayed. Do not press any key and keep the test
lead connected to L2 phase cable
Mod
Ph Seq
PH2
Meas
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9. If the two phases, to which the test lead has been connected,
are in the correct sequence, the message “123” is displayed. If the phase sequence is incorrect, the message “132” is
displayed
10. To start a new measurement, press F3 (New)
Mod New
Ph Seq
123
Phase conformity test
CAUTION
While measuring, the instrument must be held in the operator’s hand.
Fig. 8: Verification of phase conformity
1. The instrument shows the screen nearby, and waits for the detection of L1 phase of the first system
2. Connect the red cable to the input lead V and the black cable to the input lead COM then position the leads
respectively to the L1 phase of the first system and the ground reference PE of the circuit under test (see Fig. 8)
Mod
Ph Seq
PH1
Wait
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3. When a voltage higher than or equal to 100V is detected, the instrument emits a sound signal (buzzer) and the message
Meas” is displayed. Do not press any key and keep the test
lead connected to L1 phase cable of the first system
Mod
Ph Seq
PH1
Meas
4. Once the voltage of L1 phase acquisition is complete, the
instrument stops the sound signal and the “Discon.”
Message is displayed. Disconnect the test lead from L1 phase of the first system.
Mod
Ph Seq
Discon.
Wait
5. The message “PH2“ is displayed and the instrument waits
for the detection of L1 phase of the second system. Connect the test lead to L1 phase of the second system.
Mod
Ph Seq
PH2
Wait
CAUTION
If more than 3 seconds elapse before detecting the phase L1 of the second
sequence, the instrument displays the message “Time Out”. It is necessary to repeat the measuring cycle from the beginning, by pressing F3 (New) key
and starting again from step 1.
6. When a voltage higher than or equal to 100V is detected, the instrument emits a sound signal (buzzer) and the message
Meas” is displayed. Do not press any key and keep the test
lead connected to L1 phase cable of the second system
Mod
Ph Seq
PH2
Meas
7. If there is correct conformity between the two phases, to
which the test lead has been connected, the message “11-“ is displayed. If not, the messages “123” or “132” are
displayed.
To start a new measurement, press F3 (New).
Mod New
Ph Seq
11-
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5.5. DC CURRENT MEASUREMENT
CAUTION
The maximum measurable DC current is 1000A. When the display shows
> 999.9A”, it means that the maximum value that the clamp is capable of
measuring has been exceeded. Exceeding these limits could result in electrical shocks to the user and damage to the instrument
We recommend holding the clamp respecting the safety area created by
the hand protection (see Fig. 3)
Fig. 9: DC current measurement
1. After positioning the selector switch to “A ”, the screen
nearby will appear.
Mod Har Fnc Zro
AC <42.5 Hz
0.0 A
2. Press F1 (Mod) to open the drop-down menu shown on the screen aside and select the “DC” option with the same key
3. Press F4 (OK) to confirm
4. Press F4 (Zro) to perform the zero of value at display
Mod Har Fnc OK
AC <10.5 Hz
---- A
AC
DC
Inrush 100A Inrush 1000A Esc
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5. Connect the cable to the middle of the clamp jaws, in order to get accurate measurements (see Fig. 9). Use the marks as a reference (see Fig. 2)
6. The screen shows an example of DC current measurement.
Mod Fnc Zro
DC
100.0 A
7. Press F3 (Fnc) to open the drop-down menu shown on the screen aside. At each subsequent pressure of key F3, the
cursor will scroll through the available items, as follows:
Max: it constantly displays the maximum value of DC
current
Min: it constantly displays the minimum selected value of
DC current
Cr+: it constantly displays the maximum positive crest
value
Cr-: it constantly displays the minimum negative crest
value
RST: (RESET) it deletes all stored Max, Min, Cr+ and Cr-
values and re-start with a new measure
Esc: it goes back to a normal measuring mode
Mod Fnc OK
DC
100.0 A
CAUTION
Always carry out current zeroing before clamping the cable The measurement of the 4 Max, Min, Cr+ and Cr- values is
simultaneous, regardless of the one displayed.
8. Pressing F4 (OK), the selected item is confirmed. Nearby, an
example of measurement with active Max function. The display shows the active function.
Mod Fnc Zro
Max DC
120.0 A
9. For the use of HOLD and backlight features see § 5.1
Max
Min Cr+ Cr­RST Esc
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EN - 21
5.6. AC/AC + DC CURRENT MEASUREMENT
CAUTION
The maximum measurable AC/AC+DC current is 1000A. When the
display shows “> 999.9A”, it means that the maximum value that the
clamp is capable of measuring has been exceeded. Exceeding these limits could result in electrical shocks to the user and damage to the instrument
We recommend holding the clamp respecting the safety area created by
the hand protection (see Fig. 3)
Fig. 10: AC/AC + DC current measurement
1. Positioning the selector switch to “A ”, the screen nearby
will appear.
Mod Har Fnc Zro
AC <42.5 Hz
0.0 A
2. Press F1 (Mod) to open the drop-down menu shown on the screen nearby and select the “AC” option with the same key
3. Press F4 (OK) to confirm
4. Press F4 (Zro) to perform the zero of value at display
Mod Har Fnc OK
AC <10.5 Hz
---- A
AC
DC Inrush 100A Inrush 1000A Esc
Page 24
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EN - 22
5. Connect the cable to the middle of the clamp jaws, in order to get accurate measurements (see Fig. 10 – left part). Use the marks as a reference (see Fig. 2)
6. The screen shows an example of AC current measurement. The instrument allows the evaluation of possible DC components overlapped on a generic alternate waveform signal (AC+DC) and this can be very useful for measurements on impulsive signals typically of no-linear loads (e.g.: welders, electric ovens, etc.)
Mod Har Fnc Zro
AC 50.0 Hz
100.0 A
7. Press F3 (Fnc) to open the drop-down menu shown on the screen aside. At each subsequent pressure of key F3, the
cursor will scroll through the available items, as follows:
Max: it constantly displays the maximum value of AC +
DC current
Min: it constantly displays the minimum selected value of
AC + DC current
Cr+: it constantly displays the maximum positive crest
value
Cr-: it constantly displays the minimum negative crest
value
RST: (RESET) it deletes all stored Max, Min, Cr+ and Cr-
values and re-start with a new measure
Esc: it goes back to a normal measuring mode
Mod Fnc OK
AC
100.0 A
CAUTION
Always carry out current zeroing before clamping the cable The measurement of the 4 Max, Min, Cr+ and Cr- values is
simultaneous, regardless of the one displayed.
8. Pressing F4 (OK), the selected item is confirmed. Nearby an
example of measurement with active Max function. The display shows the active function.
Mod Har Fnc Zro
Max AC 50.0 Hz
120.0 A
9. For the use of HOLD and backlight features see § 5.1
Max
Min Cr+ Cr­RST Esc
Page 25
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EN - 23
5.6.1. Current Harmonics measurement
1. Press the F2 (Har) key to select the screen of current harmonics as shown nearby. Press again the F2 (RMS) to go
back to current measurement screen
Mod Har Fnc Zro
AC 50.0 Hz
100.0 A
2. Pressing F1 (◄) or F4 (►) it is possible to move the cursor
over the graph and select the harmonic to be measured. The correspondent absolute or percentage value of harmonic current is displayed. It is possible to measure up to the 25
th
harmonic
RMS Fnc
H01 100.0 A ThdI 10.0 %
3. Press F3 (Fnc) to open the drop-down menu shown on the screen aside. At each subsequent pressure of key F3, the
cursor will scroll through the available items as follows:
Max: it constantly displays the maximum RMS value of
the selected current harmonic
Min: it constantly displays the minimum RMS value of the
selected current harmonic
Abs: it displays the absolute value of the harmonics  %: it displays the value of the harmonics as percentage
value with respect to the fundamental
RST: (RESET) it deletes all stored Max, Min values and
re-start with a new measure
Esc: it goes back to a normal measuring mode
RMS Fnc
H01 100.0 A ThdI 10.0 %
CAUTION
Since the menu contains functions with a different meaning (Max-Min and Abs-%), it is necessary to enter the menu twice: once for displaying Abs or % values and second time to enable the Max or Min functions.
4. Pressing F4 (OK), the selected item is confirmed. Nearby, an
example of measurement with active Max function. The display shows the active function.
RMS Fnc
H01 100.0 A ThdI 10.0 %
Max
5. For the use of HOLD and backlight features see § 5.1
Max
Min Abs % RST Esc
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EN - 24
5.6.2. Dynamic Inrush current measurement
CAUTION
The maximum measurable AC/AC+DC current is 1000A. Do not measure
currents exceeding the limits given in this manual. Exceeding these limits could result in electrical shocks to the user and damage to the instrument.
We recommend holding the clamp respecting the safety area created by
the hand protection (see Fig. 3).
Currents <2A are zeroed.
1. Press F1 (Mod) to select the inrush current measurement between the “Inrush 100A” (for inrush current <100A) or “Inrush 1000A” (for inrush current <1000A) options as shown asideress F4 (OK) to confirm
Mod Har Fnc OK
50HzA C 50.0
10 A
2. Press F3 (Lim) for the setting of limit threshold value on
inrush current and the type of measurement as shown aside
Mod Dsp Lim Run
Dynamic IRC
---- A
Fix – LIM 2A
3. Press F2 () or F3 () to set the reference threshold for the saving of event (2A 100A for “Inrush 100A” and 5A 900A
for “Inrush 1000A”)
4. Press F4 (OK) to confirm and return to main screen.
OK
Thres.:
002 A
5. Press F4 (Run) key to start the detection of the inrush current event. Press F4 (Stp) to stop the detection of the inrush current event in any time.
A
fter the detection of the
event (when the measured current is over the limit
threshold), the measurement is automatically stopped by
the instrument and the maximum RMS value in 100ms is displayed as shown aside
Mod Par Lim Run
Dynamic IRC
100ms
14.3 A
Fix – LIM 2A
AC DC
Inrush 100A
Inrush 1000A Help
Page 27
HT9020
EN - 25
6. Press F2 (Dsp) to select the available values, as follows:
PK  Peak value in 1ms  Max RMS value in 16.7ms  Max RMS value in 20ms  Max RMS value in 50ms  Max RMS value in 100ms  Max RMS value in 150ms  Max RMS value in 200ms
Mod Dsp Lim Run
PK
18.2 A
Fix – LIM 2A
7. Press F4 (Run) to start a new measurement or move the selector to exit from the
function
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EN - 26
5.7. DC POWER AND ENERGY MEASUREMENT
CAUTION
The maximum DC input voltage is 1000V and the maximum measurable
DC current is 1000A. Do not measure voltages and currents exceeding the limits given in this manual. Exceeding these limits could result in electrical shocks to the user and damage to the instrument
We recommend holding the clamp respecting the safety area created by
the hand protection (see Fig. 3)
Fig. 11: DC power/energy measurement
1. After positioning the selector switch to “W ”, the screen
aside will appear.
Mod Par Fnc Zro
AC <10.0 Hz
---- kW
---- kVari
---- kVA
1P
2. Press F1 (Mod) to open the drop-down menu shown on the screen aside and select the “DC” option with the same key
3. Press F4 (OK) to confirm
Mod Par Fnc OK
AC <10.0 Hz
---- kW
---- kVari
---- kVA
AC 1P AC 3P
DC
Help
Page 29
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EN - 27
4. Press F4 (Zro) to perform the zero of value at display
Mod Par Fnc Zro
DC
0.00 kW
5. Connect red cable to input lead V and black cable to input lead COM. Position red
lead to “+” and black lead to “-” then connect “+” cable to the clamp jaws, respecting the direction of current indicated by the arrow (see Fig. 11). Connect the cable to the middle of the clamp jaws, in order to get accurate measurements. Use the marks as a reference (see Fig. 2)
6. The value of DC power is displayed expressed in kW. Press
F2 (Par) to open the drop-down menu shown on the screen aside and select the “Volt/Curr” option for the DC voltage and current measurement. Confirm with F4 (OK). The
following screen is displayed:
Mod Par Fnc OK
DC
1.60 kW
7. The screen shows an example of DC Voltage and Current measurements.
Mod Par Fnc Zro
DC
80.0 V
20.0
A
8. Press F2 (Par) to open the drop-down menu shown on the screen aside and select the “Energy” option for the DC energy measurement. Confirm with F4 (OK). The following
screen is displayed:
Mod
Par Fnc OK
DC
1.60 kW
Power
Volt/Curr
Energy
Power Volt/Curr
Energy
Page 30
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EN - 28
9. Press F4 (Run) to start the energy measurement. A counter
in the bottom of the display is activated
Mod Par Run
DC
0.000 kWh
0000:00:00
10. Press F4 (Stp) to stop the energy measurement. The correspondent value is displayed. Press F4 (Run) again to
zero the counter and start a new energy measurement
Mod Par Stp
DC
3.200 kWh
0002:00:00
11. While measuring DC Power, press F3 (Fnc) to open the
drop-down menu shown on the screen aside. At each
subsequent pressure of F3, the cursor will scroll through the
available items, as follows:
Max: it constantly displays the maximum value of the
measured parameter
Min: it constantly displays the minimum value of the
measured parameter
RST: (RESET) it deletes all stored Max, Min values and
re-start with a new measure
Esc: it goes back to a normal measuring mode
Mod Par Fnc OK
DC
0.40 kW
12. By pressing F4 (OK), the selected item is confirmed. Nearby,
an example of measurement with active Max function. The display shows the active function.
Mod Par Fnc Zro
Max DC
2.40 kW
Max
Min RST Esc
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EN - 29
13. While measuring Voltage and Current, press F3 (Fnc) to
open the drop-down menu shown on the screen aside. At
each subsequent pressure of F4, the cursor will scroll
through the available items, as follows:
Max: it constantly displays the maximum value of the
measured parameter
Min: it constantly displays the minimum value of the
measured parameter
Cr+: it constantly displays the maximum positive crest
value measured
Cr-: it constantly displays the minimum negative crest
value measured
RST: (RESET) it deletes all stored Max, Min, Cr+ and Cr-
values and re-start with a new measure
Esc: it goes back to a normal measuring mode
Mod Par Fnc OK
DC
80.0 V
20.0 A
14. By pressing F4 (OK), the selected item is confirmed. Nearby,
an example of measurement with active Max function. The display shows the active function.
Mod Par Fnc OK
Max DC
80.0 V
20.0 A
15. For the use of HOLD and backlight features see § 5.1
Max
Min Cr+ Cr­RST Esc
Page 32
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EN - 30
5.8. AC/AC+DC POWER AND ENERGY MEASUREMENT
CAUTION
The maximum AC/AC+DC input voltage is 1000V and the maximum
measurable AC/AC+DC current is 1000A. Do not measure voltages and currents exceeding the limits given in this manual. Exceeding these limits could result in electrical shocks to the user and damage to the instrument
We recommend holding the clamp respecting the safety area created by
the hand protection (see Fig. 3)
Fig. 12: AC/AC+DC power measure on Single phase and balanced Three phase systems
1. After positioning the selector switch to “W ”, the screen
aside will appear.
Mod Par Fnc Zro
AC <10.0 Hz
---- kW
---- kVari
---- kVA
1P
2. Press F1 (Mod) to open the drop-down menu shown on the screen aside and select the “AC 1P” (Single phase measurement) or “AC 3P” (balanced Three phase measurement) options with the same key. The “1P” or “3P“symbols are displayed.
3. Press F4 (OK) to confirm
Mod Par Fnc OK
AC <10.0 Hz
---- kW
---- kVari
---- kVA
AC 1P
AC 3P DC Help
Page 33
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EN - 31
4. Press F4 (Zro) to perform the zero of value at display
Mod Par Fnc Zro
AC
0.00 kW
5. Connect red cable to input lead V and black cable to input lead COM then perform
the connection as indicated in Fig. 12 depending on the type of system under test. Put the phase cable into the clamp jaws respecting the direction of current indicated by the arrow (see Fig. 12). Connect the cable to the middle of the clamp jaws, in order to get accurate measurements. Use the marks as a reference (see Fig. 2)
6. The value of AC powers (active , reactive and apparent) is displayed. The instrument allows the evaluation of possible DC components overlapped on a generic alternate waveform signal (AC+DC) and this can be very useful for measurements on impulsive signals typically of no-linear loads (e.g.: welders, electric ovens, etc.)
Press F2 (Par) and select with the same key the “PF-DPF”
option for the power factor (PF) and Cosphi (DPF)
measurement. Confirm with F4 (OK). The following screen is
displayed:
Mod Par Fnc OK
DC
1.60 kW
1P
7. The screen shows an example of PF and DPF measurement.
The “i” and “c” symbols mean respectively the inductive or
capacitive nature of the load.
Mod Par Fnc Zro
AC 50.0 Hz
PF 0.94 i DPF 0.94 i
1P
8. Press F2 (Par) to open the drop-down menu shown on the screen aside and select the “Volt/Curr” option for the voltage and current measurement. Confirm with F4 (OK).
The following screen is displayed.
Mod Par Fnc OK
DC
1.60 kW
1P
P-Q-S
PF-DPF
Volt/Curr Harm Voltage Harm Current Energy
P-Q-S PF-DPF
Volt/Curr
Harm Voltage Harm Current Energy
Page 34
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EN - 32
9. Nearby, an example of measurement of AC voltage and current in a single phase system.
Mod Par Fnc Zro
AC 50.0 Hz
229.7 V
99.6 A
1P
10. Press F2 (Par) to open the drop-down menu shown on the screen aside and select the “Harm Voltage” for the reading of AC+DC voltage harmonic value. Confirm with F4 (OK).
The following screen is displayed.
Mod Par Fnc OK
DC
1.60 kW
1P
11. Pressing F1 () or F4 (►), it is possible to move the cursor
over the graph and select the harmonic to be measured. The correspondent absolute or percentage value of harmonic voltage is displayed. It is possible to measure up to the 25
th
harmonic.
Par Fnc
h05 2.3 V ThdV 2.4 %
12. Press F2 (Par) to open the drop-down menu shown on the screen aside and select the “Harm Current” for the reading of current harmonic value. Confirm with F4 (OK). The
following screen is displayed.
Mod Par Fnc OK
DC
1.60 kW
1P
13. Pressing F1 (◄) or F4 (►) it is possible to move the cursor
over the graph and to select the harmonic to be measured. The correspondent absolute or percentage value of harmonic current is displayed. It is possible to measure up to the 25
th
harmonic
Par Fnc
h05 2.9 A ThdI 10.7 %
P-Q-S PF-DPF Volt/Curr Harm Voltage
Harm Current
Energy
P-Q-S PF-DPF Volt/Curr
Harm Voltage
Harm Current Energy
Page 35
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EN - 33
14. Press F3 (Fnc) to open the drop-down menu shown on the screen aside. At each subsequent pressure of key F3, the
cursor will scroll through the available items, as follows:
Max: it constantly displays the maximum RMS value of
the selected voltage or current harmonic
Min: it constantly displays the minimum RMS value of the
selected voltage or current harmonic
Abs: it displays the absolute value of the harmonics  %: it displays the value of the harmonics as percentage
value with respect to the fundamental
RST: (RESET) it deletes all stored Max, Min values and
re-start with a new measure
Esc: it goes back to a normal measuring mode
Par Fnc OK
H01 100.0 V ThdV 10.0 %
CAUTION
Since the menu contains functions with a different meaning (Max-Min and Abs-%), it is necessary to enter the menu twice: once for displaying Abs or % values and second time to enable the Max or Min functions.
15. Pressing F4 (OK), the selected item is confirmed. Nearby, an
example of current harmonic measurement with active Max function. The display shows the active function.
RMS Fnc
H01 100.0 A ThdI 10.0 %
Max
16. Press F2 (Par) to open the drop-down menu shown on the screen aside and select the “Energy” option for the energy measurement. Confirm with F4 (OK). The following screen is
displayed:
Mod Par Fnc OK
DC
1.60 kW
17. Press F4 (Run) to start the energy measurement. A counter
in the bottom of the display is activated
Mod Par Fnc Run
AC 50.0 Hz
0.000 kWh
0.000 kVarih
0.000 kVarch
0000:00:00 1P
Max
Min Abs % RST Esc
P-Q-S PF-DPF Volt/Curr Harm Voltage Harm Current
Energy
Page 36
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EN - 34
18. Press F4 (Stp) to stop the energy measurement. The corresponding value is displayed. Press F4 (Run) again to
zero the counter and start a new energy measurement.
Mod Par Fnc Stp
AC 50.0 Hz
2.242 kWh
0.841 kVarih
0.000 kVarch
0002:00:00 1P
19. While measuring P-Q-S power or PF-DPF, press F3 (Fnc) to
open the drop-down menu shown on the screen aside. At
each subsequent pressure of F3, the cursor will scroll
through the available items, as follows:
Max: it constantly displays the maximum value of the
measured parameter
Min: it constantly displays the minimum value of the
measured parameter
RST: (RESET) it deletes all stored Max, Min values and
re-start with a new measure
Esc: it goes back to a normal measuring mode
Mod Par Fnc OK
AC 50.0 Hz
21.47 kW
7.68 kVari
22.90 kVA
1P
20. Pressing F4 (OK), the selected item is confirmed. Nearby, an
example of power measurement with active Max function. The display shows the active function.
Mod Par Fnc Zro
Max AC 50.0 Hz
21.47 kW
7.68 kVari
22.90 kVA
1P
21. While measuring AC+DC voltage or current, press F3 (Fnc)
to open the drop-down menu shown on the screen aside. At
each subsequent pressure of F3, the cursor will scroll
through the available items, as follows:
Max it constantly displays the maximum value of the
measured parameter
Min it constantly displays the minimum value of the
measured parameter
Cr+ it constantly displays the maximum positive crest
value measured
Cr-: it constantly displays the minimum negative crest
value measured
RST (RESET) it deletes all stored Max, Min, Cr+ and
Cr- values and re-start with a new measure
Esc: it goes back to a normal measuring mode
Mod Par
Fnc OK
AC 50.0 Hz
80.0 V
20.0 A
Max
Min RST Esc
Max
Min Cr+ Cr­RST Esc
Page 37
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EN - 35
22. Pressing F4 (OK), the selected item is confirmed. Nearby, an
example with active Max function. The display shows the active function.
Mod Par Fnc Zro
Max AC 50.0 Hz
80.0 V
20.0 A
23. For the use of HOLD and backlight features see § 5.1
Page 38
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5.9. RESISTANCE AND CONTINUITY TEST MEASUREMENT
CAUTION
Before attempting any resistance measurement, remove power from the circuit under test and discharge all capacitors, if present.
Fig. 13: Resistance measurement
1. Positioning the selector switch to “
”, the screen aside will
appear.
Mod Fnc
> 30.0 k
2. Press F1 (Mod) to open the drop-down menu shown on the screen aside and select the “Resistance” option with the
same key
3. Press F4 (OK) to confirm
Mod Fnc OK
> 30.0 k
Resistance
Continuity Help
Page 39
HT9020
EN - 37
4. Connect red cable to the input lead V and black cable to the input lead COM, then
connect the instrument as described in Fig. 13
5. The screen shows an example of Resistance measurement.
Mod Fnz
20.0 k
6. Press F1 (Mod) to open the drop-down menu shown on the screen aside and select the “Continuity” option with the
same key
7. Press F4 (OK) to confirm. The instrument changes into
Continuity test mode and the following screen is displayed.
Mod Fnc OK
> 30.0 k
8. Press F3(Lim) key to set the limit value of Continuity test (if
the measured resistance is lower than the set limit resistance value (e.g. Res Lim: 1), the buzzer sounds continuously.
Mod Fnz Lim
> 300
Res Lim: 1
9. Press F2 () or F3 () and set the limit value within the 1
 
150 interval
10. Press F4 (OK) to confirm.
OK
Res Lim:
005
Resistance
Continuity
Help
Page 40
HT9020
EN - 38
11. While measuring Resistance or Continuity, press F2 (Fnc) to
open the drop-down menu shown on the screen aside. At
each subsequent pressure of F2, the cursor will scroll
through the available items, as follows:
Max: it constantly displays the maximum resistance value
measured
Min: it constantly displays the minimum resistance value
measured
RST: (RESET) it deletes all stored Max, Min values and
re-start with a new measure
Esc: it goes back to a normal measuring mode
Mod Fnc OK
50.0 k
12. Pressing F4 (OK), the selected item is confirmed. Nearby, an
example of measurement with active Max function. The display shows the active function.
Mod Fnc
Max
50.0 k
13. For the use of HOLD and backlight features see § 5.1
Max
Min RST Esc
Page 41
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EN - 39
6. MAINTENANCE
6.1. GENERAL INFORMATION
1. The instrument you purchased is a precision instrument. While using and storing the instrument, carefully observe the recommendations listed in this manual in order to prevent possible damage or danger during use.
2. Do not use the instrument in environments with high humidity levels or high temperatures. Do not expose to direct sunlight.
3. Always switch off the instrument after use. In case the instrument is not to be used for a long time, remove the batteries to avoid acid leaks that could damage the instrument’s internal circuits.
6.2. BATTERY REPLACEMENT
CAUTION
Only expert and trained technicians should perform this operation. Before carrying out this operation, make sure you have removed all cables from input leads or the cable under test from clamp jaws.
1. Turn the switch on OFF position.
2. Disconnect the cables from the inputs and the cable under test from the clamp jaws.
3. Loosen the screws from battery cover and remove it.
4. Remove the flat batteries from the battery compartment.
5. Insert two new batteries of the same type (see § 7.1.2). Pay attention to the correct polarity.
6. Place the battery cover over the compartment and fasten it with the relevant screws.
7. Do not waste old batteries into the environment. Use the relevant containers for disposal.
6.3. CLEANING THE INSTRUMENT
Use a soft and dry cloth to clean the instrument. Never use wet cloths, solvents, water, etc.
6.4. END OF LIFE
CAUTION: the symbol on the instrument indicates that the appliance and its
accessories must be collected separately and correctly disposed of.
Page 42
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EN - 40
7. TECHNICAL SPECIFICATIONS
7.1. TECHNICAL CHARACTERISTICS
Accuracy indicated as ±[%rdg + (num digit * resolution)] referred to 23°C ± 5°C, < 80%HR.
DC Voltage
Range Resolution Accuracy
Protection against
overcload
0.1 999.9V
0.1V
(1.0%rdg+3dgt)
1000VDC/ACrms
Input impedance: 1M
AC Voltage (AC+DC TRMS)
Range Resolution Accuracy
Protection against
overload
0.1 999.9V
0.1V
(1.0%rdg+3dgt)
1000VDC/ACrms
Input impedance: 1MΩ; Max. Crest Factor: 1.41, Fundamental: 50/60Hz ± 15%, Bandwidth: 42.5Hz 1725Hz
AC/DC Voltage: MAX / MIN / CREST
Function Range Resolution Accuracy Response time
MAX,MIN,CREST
0.5999.9V
0.1V
(3.5%rdg+5dgt)
1sec
Input impedance: 1MΩ; Max. Crest Factor: 1.41, Fundamental: 50/60Hz ± 15%, Bandwidth: 42.5Hz 1725Hz
DC Current
Range Resolution Accuracy
Protection against
overload
0.1 999.9A
0.1A
(2.0%rdg+5dgt)
1000ADC/ACrms
AC Current (AC+DC TRMS)
Range Resolution Accuracy
Protection against
overload
0.5 999.9A
0.1A
(1.0%rdg+5dgt)
1000ADC/ACrms
Max. Crest Factor: 1.41, Fundamental: 50/60Hz ± 15%, Bandwidth: 42.5Hz 1725Hz
AC/DC Current: MAX / MIN / CREST
Function Range Resolution Accuracy Response time
MAX,MIN,CREST
0.5999.9A
0.1A
(3.5%rdg+5dgt)
1sec
Max. Crest Factor: 1.41, Fundamental: 50/60Hz ± 15%, Bandwidth: 42.5Hz 1725Hz
Resistance and Continuity test
Range Resolution Accuracy
Protection against
overload
0.0  199.9 0.1
(1.0rdg+5dgt)
1000VDC/ACrms
200  1999 1
2.00k  19.99k 0.01k
20.0k  29.9k 0.1k
Buzzer ON if R RLIM, RLIM range: 1 150
Frequency (with test leads/ with jaws)
Range Resolution Accuracy
Protection against
overload
42.5 69.0Hz
0.1Hz
(1.0%rdg+5dgt)
1000VDC/ACrms 1000ADC/ACrms
Voltage range for frequency measure: 0.5 1000V / Current range for frequency measure with jaws: 0.5 1000A
Inrush current (DC, AC+DC TRMS)
Range Resolution Peak accuracy Max RMS accuracy
Protection against
overload
1.0 99.9A
0.1A
(2.0%rdg + 5dgt) (2.0%rdg + 5dgt)
1000ADC/ACrms
10 999A
1A
Crest factor: 3, Sample frequency: 4kHz, Response time: Peak: 1ms, Max RMS : calculated on: 16.7, 20, 50, 100, 150, 200ms Accuracy declared for frequency: DC, 42. .. 69Hz
Page 43
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EN - 41
Phase sequence and phase coincidence
Range Frequency
Protection against
overload
100 1000V 42.5 69Hz
1000VDC/ACrms
Input impedance: 1M
DC Power
Range [kW] Resolution [kW] Accuracy
0.00 99.99
0.01
(3.0rdg+3dgt)
100.0 999.9
0.1
Input impedance: 1M, Accuracy referred for Voltage > 10V, Current 2A
Active, Apparent Power AC (AC + DC TRMS)
Range [kW], [kVA] Resolution [kW], [kVA] Accuracy
0.02 99.99
0.01
(2.0rdg+3dgt)
100.0 999.9
0.1
Input impedance: 1M, Accuracy referred for sinusoidal waveform, 42.5..69Hz, Voltage > 10V, Current 2A, Pf 0.5
Active Energy AC (AC + DC TRMS)
Range [kWh] Resolution [kWh] Accuracy
0.00 99.99
0.01
(2.0rdg+3dgt)
100.0 999.9
0.1
Input impedance: 1M, Accuracy referred for sinusoidal waveform, 42.5..69Hz, Voltage > 10V, Current 2A, Pf 0.5
Reactive Power AC (AC + DC TRMS)
Range [kV AR] Resolution [kVAR] Accuracy
0.02 99.99
0.01
(2.0rdg+3dgt)
100.0 999.9
0.1
Input impedance: 1M, Accuracy referred for sinusoidal waveform, 42.5..69Hz, Voltage > 10V, Current 2A, Pf 0.9
Reactive Energy AC (AC + DC TRMS)
Range [kV ARh] Resolution [kVARh] Accuracy
0.00 99.99
0.01
(2.0rdg+3dgt)
100.0 999.9
0.1
Input impedance: 1M, Accuracy referred for sinusoidal waveform, 42.5..69Hz, Voltage > 10V, Current 2A, Pf 0.9
Power factor/cosphi
Range Resolution Accuracy
0.20 1.00
0.01
(2.0rdg+2dgt)
Input impedance: 1M, Accuracy referred for sinusoidal waveform, 42.5..69Hz, Voltage > 10V, Current 2A
Voltage and Current Harmonics
Harmonic order
Fundamental
frequency
Resolution Accuracy (* no zeroed values)
DC
42.5Hz 69Hz
0.1V / 0.1A
(5.0rdg+20dgt)
1 25 (5.0rdg+10dgt) THD% 0.1%
(10.0rdg+10dgt)
The accuracy of harmonics amplitude expressed in % is evaluated considering the accuracy of the parameters ratio (*) Voltage harmonics are zeroed in the below conditions:
1st harmonic: if value < 0.5V DC, 2nd to 25th harmonics: if harmonic value <0.5% of fundamental value or if value < 0.5V
Current harmonics are zeroed in the below conditions:
1st harmonic: if value < 0.5A DC, 2nd to 25th harmonics: if harmonic value <0.5% of fundamental value or if value < 0.5A
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HT9020
EN - 42
7.1.1. Reference guidelines
Safety: IEC/EN61010-1, IEC/EN61010-2-032 EMC : IEC/EN61326-1 Technical documentation: IEC/EN61187 Safety of measuring accessories: IEC/EN61010-31 Insulation: double insulation Pollution level: 2 Max height of use: 2000m Measurement category: CAT IV 600V / CAT III 1000V to gnd, max 1000V
between inputs
7.1.2. General characteristics
Mechanical characteristics
Dimensions (L x W x H): 252 x 88 x 44mm (9 x 3 x 2 in) Weight (batteries included): approx 420g (15 ounces) Jaw opening / Max cable size: 45mm (1.8 in)
Power supply
Battery type: 2 batteries x 1.5V LR 03 AAA Battery life: approx. 150 hours of use in “W ” position Auto power OFF: after 5 min of idleness (disabled)
Display
Characteristics: graphic display 128x128 pixels Sampling rate: 128 samples per period (base sampling) Updating frequency: 1time/s
7.2. ENVIRONMENT
7.2.1. Environmental conditions for use
Reference calibration temperature: 23° ± 5 °C (73 ± 41°F) Operating temperature: 0 ÷ 40 °C (32 ÷ 104°F) Allowable relative humidity: <80%HR Storage temperature: -10 ÷ 60°C (14 ÷ 140°F) Storage humidity: <70%HR
This instrument satisfies the requirements of Low Voltage Directive 2006/95/EC
(LVD) and of EMC Directive 2004/108/EC
This instrument satisfies the requirements of 2011/65/EU (RoHS) directive and
2012/19/EU (WEEE) directive
7.3. ACCESSORIES PROVIDED
Pair of test leads Pair of alligator clips Carrying bag Batteries ISO9000 calibration certificate User manual
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HT9020
EN - 43
8. SERVICE
8.1. 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.
The warranty shall not apply in the following cases:
Repair and/or replacement of accessories and batteries (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 due to improvements in technology.
8.2. SERVICE
If the instrument does not operate properly, please check the conditions of batteries and cables before contacting the After-sales Service 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 sahll be agreed in advance. A report shall always be enclosed to a shipment, stating the reasons for the product’s return. Use exclusively original packaging for shipment; any damage due to the use of non-original packaging material will be charged to the Customer.
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HT9020
EN - 44
9. APPENDIX – THEORETICAL OUTLINE
9.1. CALCULATION OF POWERS IN “AC 1P” MODE
The instrument measures the values of Rms Voltage and Rms Current and calculates the average Power values for each period. The formulas for power calculation are:
N
i
ii
iv
N
P
1
1
N
i
i
N
i
i
i
N
v
N
S
1
2
1
2
11
22
PSQ
S
P
Pf
where: N = number of samples in the period
9.2. CALCULATION OF POWERS IN “AC 3P” MODE
The instrument measures the values of Rms Voltage and Rms Current and calculates the average Power values for each period. The formulas for power calculation are:
N
i
ii
iv
N
Q
1
1
3
N
i
i
N
i
i
i
N
v
N
S
1
2
1
2
11
3
22
QSP
S
P
Pf
where: N = number of samples in the period
9.3. CALCULATION OF POWERS IN “DC” MODE
The instrument measures the values of Avg Voltage and Avg Current and calculates the average Power value for each period. The formula for power calculation is:
 
 
 
 
N
i
i
N
i
i
i
N
v
N
P
11
11
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HT9020
EN - 45
9.4. VOLTAGE AND CURRENT HARMONICS
Any periodic non-sinusoidal wave may be represented by a sum of sinusoidal waves, each with a frequency which is a whole multiple of the fundamental, according to the relationship:
)tsin(VVv(t)
kk
1k
k0
(1)
where: V0 = Average value of v(t) V1 = Amplitude of the fundamental of v(t) Vk = Amplitude of the k-nth harmonic of v(t)
CAPTION:
1. Fundamental
2. Third Harmonic
3. Distorted waveform sum of two previous components.
Effect of the sum of 2 multiple frequencies.
For network voltage, the fundamental has a frequency of 50 Hz, the second harmonic has
a frequency of 100 Hz, the third harmonic has a frequency of 150 Hz and so on. Harmonic
distortion is a continuous problem and must not be confused with short-duration phenomena such as peaks, drops or fluctuations. It can be seen from (1) that each signal consists of the sum of infinite harmonics. However, an order number exists beyond which the value of the harmonics may be considered as negligible.
A fundamental index to detect the presence of harmonics is the THD defined as:
1
40
2
2
V
V
THDv
h
h
This index takes into consideration the presence of all harmonics, and the more distorted is the waveform, the higher is the index.
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HT9020
EN - 46
9.5. LIMIT VALUES FOR HARMONICS
Standard EN50160 prescribes the limits for the Voltage Harmonics that Energy Provider may introduce into the network. Under normal operating conditions, at any time in a week, 95% of the efficient values of
each harmonic voltage, averaged to 10 minutes, must be lower than or equal to the values indicated in the following Table
The total harmonic distortion (THD%) of supply voltage must be lower than or equal to
8%.
Odd Harmonics Even Harmonics
Not multiple of 3 Multiple of 3
Order h
Relative
Voltage %Max
Order h Relative Voltage %Max Order h Relative Voltage %Max
5 6 3 5 2 2
7 5 9 1,5 4 1 11 3,5 15 0,5 6..24 0,5 13 3 21 0,5 17 2 19 1,5 23 1,5 25 1,5
These limits, which theoretically apply only to Electric Power Suppliers, provide anyway a series of reference values within which even the harmonics put into network by users should be kept.
9.6. CAUSES FOR THE PRESENCE OF HARMONICS
Any appliance altering the sinusoidal wave or simply using a part of such wave causes
distortions to the sinusoid, and hence harmonics
All current signals are therefore someway virtually distorted. The most common
distortion is the harmonic distortion caused by non-linear loads such as household appliances, personal computers or motor speed adjusters. Harmonic distortion generates significant currents at frequencies which are whole multiples of network
voltage. Harmonic currents have a remarkable effect on neutral conductors of electrical systems.
In most countries, the network voltage used is three-phase 50/60Hz, supplied by a
transformer with triangle-connected primary circuit and star-connected secondary circuit. The secondary circuit generally generates 230V AC between phase and neutral and 400V AC between phase and phase. Balancing loads for each phase has always been a problem for electrical system designers.
Approximately ten years ago, in a global balanced system, the vector sum of the
currents in the neutral was zero or anyway quite low (in view of difficulty to get a perfect balance). Connected devices were incandescent lights, small motors and other devices that presented linear loads. The result was an essentially sinusoidal current in each phase and a low current on the neutral at a frequency of 50/60Hz.
“Modern” devices such as TV sets, fluorescent lights, video machines and microwave
ovens normally draw current for only a fraction of each cycle, thus causing non-linear loads and, consequently, non-linear currents. All this generates odd harmonics of the 50/60Hz line frequency. For this reason, nowadays the current in the transformers of the distribution boxes contains not only a 50Hz (or 60Hz) component, but also a 150Hz (or 180Hz) component, a 250Hz (or 300Hz) component and other significant harmonic components up to 750Hz (or 900Hz) and above.
The vector sum of the currents in a global balanced system that feeds non-linear loads
may still be quite low. However, the sum does not eliminate all harmonic currents. The odd multiples of the third harmonic (called “TRIPLENS”) are added together in the neutral conductor and can cause overheating even with balanced loads.
Page 49
HT9020
EN - 47
Consequence resulting from presence of harmonics
Generally, harmonics of even, 2nd, 4th etc. order do not create problems. Designers must consider the following points when designing a power distribution system containing harmonic currents:
Installation parts Effects traceable to Harmonics
Fuses
Non-uniform heating of internal fuse element and consequent overheating which can also lead to an explosion of the fuse casing.
Cables
Increase in “body” effect; this means that, for cables with many wires, the internal wires have higher impedance than the external wires. As a consequence, current, which normally distributes along the external surface of the wire, produces: – over-heating of the conductor; – a premature degrading of the cable’s insulation; – an increase in line voltage drop.
Neutral conductor
Triple harmonics, odd multiple of three, sum on neutral (instead of nullifying themselves), thus generating a potentially dangerous overheating of the conductor.
Transformers
Increase in copper loss due to a higher TRMS value of the current that circulates on internal circuits, and also due to the “body” effect on protected wires. Increase of iron loss due to hysteresis cycle distortion and due to the generation of leakage currents on the magnetic core. Heating of insulation material due to a possible DC component that can generate saturation of the magnetic core column.
Motors
Increase of loss due to overheating of internal circuits and possible damage of insulation material. The 5
th
and 11th harmonic components generate some abnormal electromagnetic coupling that
can increase motor speed.
Re-phasing capacitors
Increase in “parallel resonance” present inside a circuit, due to inductive loads and re-phasing capacitors, when at least one of the harmonics has the same frequency as the resonance phenomenon. Effects of this event can be very dangerous, with explosion of used re-phasing capacitors.
RCD devices
Possible saturation of current sensing toroidal transducers resulting in malfunction, both in terms of untimely tripping and increase of the tripping threshold.
Energy disk counters
Increased rotation speed of a disk resulting in measurement errors (especially in case of low power factor loads).
Power controls switch
Reduction of electric duration of contact surfaces.
UPS
Reduced power generation from UPS.
Electronics devices
Internal damage of electronic components not protected by suitable devices.
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