HT HT9023 User manual

Copyright HT ITALIA 2020 Release EN 1.01 - 03/07/2020
ENGLISH
User manual

HT9023
EN - 1
TABLE OF CONTENTS
1.PRECAUTIONS AND SAFETY MEASURES ...............................................................3
1.1.Preliminary instructions ..................................................................................................... 3
1.2.During use......................................................................................................................... 4
1.3.After use............................................................................................................................ 4
1.4.Definition of measurement (overvoltage) category............................................................ 4
2.GENERAL DESCRIPTION ...........................................................................................5
2.1.Measuring average values and TRMS values................................................................... 5
2.2.Definition of true root mean square value and crest factor................................................ 5
3.PREPARATION FOR USE ...........................................................................................6
3.1.Initial checks...................................................................................................................... 6
3.2.Instrument power supply ................................................................................................... 6
3.3.Storage.............................................................................................................................. 6
4.NOMENCLATURE........................................................................................................7
4.1.Instrument description....................................................................................................... 7
4.1.1.Alignment marks ................................................................................................................................ 7
4.1.2.Hand protection ................................................................................................................................. 8
4.1.3.Indication of the conventional direction of Current............................................................................. 8
4.2.Function keys description.................................................................................................. 9
4.2.1.F1, F2, F3, F4/OK keys ..................................................................................................................... 9
4.2.2.H/ESC/ key .................................................................................................................................... 9
4.3.Initial screen ...................................................................................................................... 9
4.4.Instrument settings.......................................................................................................... 10
4.4.1.General menu .................................................................................................................................. 10
4.4.2.Date/Time menu .............................................................................................................................. 10
4.4.3.Log menu......................................................................................................................................... 11
4.4.4.Continuity menu............................................................................................................................... 11
4.4.5.Memory REC – Deleting saved data ............................................................................................... 11
4.4.6.Memory IRC..................................................................................................................................... 12
5.OPERATIVE INSTRUCTIONS ...................................................................................13
5.1.AC Voltage detection....................................................................................................... 13
5.2.DC Voltage measurement ............................................................................................... 13
5.3.AC and AC+DC Voltage measurement........................................................................... 15
5.3.1.Voltage Harmonics measurement ................................................................................................... 17
5.3.2.Phase Sequence and Phase Conformity with 1 wire ....................................................................... 18
5.4.DC Current measurement ............................................................................................... 23
5.5.AC and AC+DC Current measurement ........................................................................... 25
5.5.1.Current Harmonics measurement.................................................................................................... 27
5.6.Dynamic Inrush current measurement ............................................................................ 28
5.7.DC Power and Energy measurement.............................................................................. 31
5.8.AC and AC+DC Power and Energy measurement ......................................................... 35
5.9.Resistance and Continuity test measurement................................................................. 41
6.CONNECTION OF INSTRUMENT TO PC AND MOBILE DEVICES..........................43
6.1.Download saved data...................................................................................................... 43
6.2.Real-Time readings ......................................................................................................... 46
6.3.Connection to mobile devices ......................................................................................... 48
7.MAINTENANCE .........................................................................................................49
7.1.General information......................................................................................................... 49
7.2.Battery replacement ........................................................................................................ 49
7.3.Cleaning the instrument .................................................................................................. 49
7.4.End of life ........................................................................................................................ 49
8.TECHNICAL SPECIFICATIONS ................................................................................50
8.1.Technical characteristics ................................................................................................. 50
8.1.1.Reference guidelines ....................................................................................................................... 52
8.1.2.General characteristics .................................................................................................................... 52
8.2.ENVIRONMENT.............................................................................................................. 53
8.2.1.Environmental conditions for use..................................................................................................... 53

HT9023
EN - 2
8.3.Accessories..................................................................................................................... 53
8.3.1.Accessories provided....................................................................................................................... 53
9.SERVICE....................................................................................................................54
9.1.Warranty conditions......................................................................................................... 54
9.2.Service ............................................................................................................................ 54
10.APPENDIX – THEORETICAL OUTLINE ....................................................................55
10.1.Voltage and current harmonics ....................................................................................... 55

HT9023
EN - 3
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:
Warning: observe the instructions given in this manual; improper use could
damage the instrument or its components.
High voltage danger: electrical shock hazard.
This symbol indicates that the clamp can operate on live conductors
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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EN - 5
2. GENERAL DESCRIPTION
The instrument carries out the following measurements:
DC voltage up to 1500V
AC, AC+DC TRMS voltage up to 1000V
“Voltsense” sensor for detection AC voltage without contact
DC, AC, AC+DC TRMS current up to 1000A
Resistance and continuity test
Phase sequence and conformity test with 1 wire
Measure/Recording AC Powers on single-phase and/or balanced three phase systems
Measure/Recording power factor on single-phase and/or balanced three phase
systems
Measure/Recording AC energies on single-phase and/or balanced three-phase
systems
Measure/Recording DC power and energy
Measure/Recording AC voltage harmonics up to 25° order and THD%
Measure/Recording AC current harmonics up to 25° order and THD%
Frequency voltage and current
Electric motor starting currents (Dynamic Inrush)
WiFi interface for PC and mobile device connection
Each of these functions can be selected using the selector switch. 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
)(
12The 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
GThis 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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EN - 6
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 § 8.3. In case of discrepancy, please contact the
Dealer. In case the instrument should be replaced, please carefully follow the instructions
given in § 9.2.
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. 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 §
8.2.1)

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EN - 7
4. NOMENCLATURE
4.1. INSTRUMENT DESCRIPTION
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
4.1.1. 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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4.1.2. 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)
4.1.3. 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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EN - 9
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.
In order 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 § 4.4) 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
HT9023
Sn 20010020
V. 1.01
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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EN - 10
4.4. INSTRUMENT SETTINGS
By positioning the selector switch to “Settings”, the screen aside
will appear, containing the possible settings of the instrument.
Press F2, F3 (,) keys to modify the settings of the selected
items and F4 (OK) key to enter in the sub-menus and confirm
the selections. Press ESC key to exit without save and return to
previous screen.
OK
General
Date/Time
Log
Continuity
Memory REC
Memory IRC
17/01 – 15:34:23
4.4.1. General menu
In this section is possible to manage the followed internal
functions:
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 this 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 this 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
Sel OK
Language:
English
Auto-off:
OFF
Backlight:
MAN
17/01 – 15:34:23
4.4.2. Date/Time menu
By selecting the “Date/Time” item the instrument shows the
screen aside will appear. Press F1 (Sel) key to move the cursor
and press the F2, F3 (, ) keys to modify the settings of the
selected item. The “Format” item allows to slelect the date/time
format between EU (European) or USA (American). Press F4
(OK) key to confirm the selected item. The “Saved data”
message is displayed for a while in the bottom part of display
Sel OK
Year:
Month:
Day:
Hour:
Minute:
Format:
20
01
17
15
34
EU
17/01 – 15:34:23

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EN - 11
4.4.3. Log menu
By selecting the “Log” item the instrument shows the screen
aside will appear. Press the F2, F3 (, ) keys to modify the
settings of the Integration Period parameter (aggregation time
between two consecutive saving inside a recording operation).
The followed values are available: 1s, 5s, 10s, 30s, 60s, 120s,
300s, 600s or 900s. Press F4 (OK) key to confirm the selected
item. The “Saved data” message is displayed for a while in the
bottom part of display
OK
Int. Period:
005 s
17/01 – 15:34:23
4.4.4. Continuity menu
By selecting the “Continuity” item the instrument shows the
screen aside will appear. Press the F2, F3 (, ) keys to
modify the setting of the limit threshold value below which the
instrument emits a sound in the continuity tests (see § 5.9). The
value is selectable in the field: 1÷ 150in steps of 1. Press
F4 (OK) key to confirm the selected item. The “Saved data”
message is displayed for a while in the bottom part of display
OK
Res Lim..
002 
17/01 – 15:34:23
4.4.5. Memory REC – Deleting saved data
In the "Memory REC" section there is a list of all the recordings
saved in the instrument. The screen on the side is shown on the
display. The meaning of the items are the follows:
Sxx Indicates the saving of an instant sampling
(Snapshot) performed by the instrument (see § 6.2) together
with the date/time in which it was saved. The number "xx"
indicates the memory location used
Lxx indicates the saving of a recording (Logger)
performed by the instrument (see § 5.7 and § 5.8) together
with the date/time when it was started. The number "xx"
indicates the memory location where the data is saved
Auton indicates the remaining residual memory available
for saving snapshots/recordings expressed in days/hours
The visualization of the recorded data is possible only
through the TopView management software or the
HTAnalisys APP
Press the F3 (ESC) key to exit and return to the general menu.
Press F4 (OK) to confirm the operations
Del Esc OK
S01:15/01-16.56:42
L02:17/01-16:59:00
L03:17/01-17:10:00
Auton: 00d/10h
17/01 – 18:34:23
Press the F2 (Del) key to clear the data saved in the memory.
The following screen is shown on the display. Use the F2 key to
section the items:
Del. Tot. Delete all contents of the memory
Del. Last Delete the last saved data
Press F4 (OK) to confirm the operations
Del Esc OK
S01:15/01-16.56:42
L02:17/01-16:59:00
L03:17/01-17:10:00
Auton: 00d/10h
17/01 – 18:34:23
Del.Tot.
Del. Last

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EN - 12
4.4.6. Memory IRC
In the "Memory IRC" section there is a list of all the inrush
current measurements saved by the instrument (see § 5.6). The
screen like the one on the side is shown on the display. The
meaning of the item is the follows:
Ixx indicates the saving of the inrush current
measurement together with the date/time in which it was
saved. The number "xx" indicates the memory location used
The visualization of the recorded data is possible only
through the TopView management software or the
HTAnalisys APP
Press the F3 (ESC) key to exit and return to the general menu.
Press F4 (OK) to confirm the operations.
Del Esc OK
I01:13/12-10.41:20
I02:13/12-10:44:21
I03:13/12-10:45:01
I04:13/12-10:45:58
17/01 – 18:34:23
Press the F2 (Del) key to clear the data in the memory. The
followed screen is shown on the display. Use the F2 key to
section the below items:
Del. Tot. Delete all contents of the memory
Del. Last Delete the last saved data
Press F4 (OK) to confirm the operation
The visualization of the recorded data is possible only
through the TopView management software or the
HTAnalisys APP
Del Esc OK
I01:13/12-10.41:20
I02:13/12-10:44:21
I03:13/12-10:45:01
I04:13/12-10:45:58
17/01 – 18:34:23
Del.Tot.
Del.Las
t

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EN - 13
5. OPERATIVE INSTRUCTIONS
5.1. 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
5.2. DC VOLTAGE MEASUREMENT
CAUTION
The maximum DC input voltage is 1500V. When the display shows “>
1500.0V”, 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.
The CAT III 1000V marking on test leads guarantees the safe
measurement of voltage up to 1500V
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
0.0 V
17/01 – 18:34:23

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EN - 14
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. The instrument goes into DC
voltage measurement mode. The F2 (Har) key is not active
in this function
Mod Har Fnc OK
AC <42.5 Hz
--0 V
17/01 – 18:34:23
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 Har Fnc
DC
9.1 V
17/01 – 18:34:23
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
17/01 – 18:34:23
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 Arm Fnc
Max DC
12.0 V
CAUTION
The measurement of the 4 Max, Min, Cr+ and Cr- values is simultaneous,
regardless of the displayed value.
8. For the use of HOLD and backlight feature see § 4.4
AC
DC
AC+DC
Ph Seq
Help
Max
Min
Cr+
Cr-
RST
Esc

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EN - 15
5.3. AC AND AC+DC VOLTAGE MEASUREMENT
CAUTION
The maximum AC and 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 and AC + DC voltage measurement
1. By positioning the selector switch to “V”, the screen nearby
will appear
Mod Har Fnc
AC <42.5 Hz
0.0 V
17/01 – 18:34:23
2. Press F1 (Mod) to open the drop-down menu shown on the
screen aside and select the “AC” or “AC+DC” option with the
same key
3. Press F4 (OK) to confirm
Modd Har Fnc OK
AC <42.5 Hz
--0 V
17/01 – 18:34:23
AC
DC
AC+DC
Ph Seq
Help

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EN - 16
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
17/01 – 18:34:23
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
17/01 – 18:34:23
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
AC 50.0 Hz
Max
231.5 V
17/01 – 18:34:23
8. For the use of HOLD and backlight features see § 4.4
Max
Min
Cr+
Cr-
RST
Esc

HT9023
EN - 17
5.3.1. 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
17/01 – 18:34:23
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 %
17/01 – 18:34:23
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
◄RMS Fnc
H01 215.0 V
ThdV 10.0 %
17/01 – 18:34:23
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
17/01 – 18:34:23
5. For the use of HOLD and backlight features see § 4.4
Max
Min
Abs
%
RST
Esc

HT9023
EN - 18
5.3.2. Phase Sequence and Phase Conformity with 1 wire
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. The followed screen is shown on
the display
Mod Har Fnc OK
AC <42.5 Hz
--0 V
17/01 – 18:34:23
AC
DC
AC+DC
Ph Seq
Help

HT9023
EN - 19
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 Go
Ph Seq
PH1
Wait
17/01 – 18:34:23
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 ≥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 Go
Ph Seq
PH1
Meas
17/01 – 18:34:23
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 Go
Ph Seq
Discon.
Wait
17/01 – 18:34:23
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 Go
Ph Seq
PH2
Wait
17/01 – 18:34:23
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 ≥100V is detected, the instrument emits a Mod
Go