HT JUPITER User manual
Copyright HT ITALIA 2017 Version EN 1.00 - 03/10/2017
ENGLISH
User manual
JUPITER
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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 andTRMS 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.Storage.............................................................................................................................. 5
4.NOMENCLATURE........................................................................................................6
4.1.Description of the instrument............................................................................................. 6
4.1.1.Instrument’s initial screen........................................................................................................... 6
4.2.Description of function keys .............................................................................................. 7
4.2.1.Key GO/HOLD............................................................................................................................ 7
4.2.2.Key H/H%/H ............................................................................................................................ 7
4.2.3.Key MODE/MXMNPK................................................................................................................. 8
4.2.4.Keys /and ...................................................................................................................... 8
4.2.5.Key RCDIN/ .................................................................................................................... 8
4.2.6.LoZ function................................................................................................................................ 9
4.2.7.AC+DC function.......................................................................................................................... 9
4.2.8.Inrush current function (INRUSH) .............................................................................................. 9
4.2.9.Disabling the Auto Power Off function........................................................................................ 9
4.2.10.Setting the contact voltage limit.................................................................................................. 9
4.2.11.Setting the rated voltage in Loop/Ra measurement................................................................. 10
4.2.12.Setting full scale of flexible clamp ............................................................................................ 10
5.OPERATING INSTRUCTIONS...................................................................................11
5.1.DC voltage measurement................................................................................................ 11
5.2.AC, AC+DC voltage measurement ................................................................................. 12
5.3.AC, DC, AC+DC voltage with low impedance (LoZ) ....................................................... 13
5.4.Resistance measurement and continuity test.................................................................. 14
5.5.Phase sequence and phase concordance with 1 terminal.............................................. 15
5.6.Overall earth resistance without RCD tripping ................................................................ 17
5.7.Measurement of Line/Loop impedance........................................................................... 20
5.8.Test on A and AC RCDs ................................................................................................. 24
5.9.DC, AC, AC+DC, INRUSH current with clamp transducers............................................ 29
6.MAINTENANCE .........................................................................................................33
6.1.Battery replacement........................................................................................................ 33
6.2.Cleaning the instrument .................................................................................................. 33
6.3.End of life ........................................................................................................................ 33
7.TECHNICAL SPECIFICATIONS ................................................................................34
7.1.Technical characteristics................................................................................................. 34
7.1.1.General characteristics............................................................................................................. 36
7.2.Environmental conditions for use.................................................................................... 36
7.3.Accessories..................................................................................................................... 36
8.ASSISTANCE.............................................................................................................37
8.1.Warranty conditions......................................................................................................... 37
8.2.Assistance....................................................................................................................... 37
9.THEORETICAL APPENDIXES...................................................................................38
9.1.Test on differential switches (RCD)................................................................................. 38
9.2.Overall earth resistance in TT systems........................................................................... 39
9.3.Loop and calculation of assumed short-circuit current.................................................... 40
9.4.Voltage and current harmonics ....................................................................................... 41
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1. PRECAUTIONS AND SAFETY MEASURES
The instrument has been designed in compliance with directive IEC/EN61010-1 relevant to
electronic measuring instruments. For your safety and in order to prevent damaging the
instrument, please carefully follow the procedures described in this manual and read all
notes preceded by symbol with the utmost attention.
Before and after carrying out measurements, carefully observe the following instructions:
Do not carry out any measurement in humid environments.
Do not carry out any measurements in case gas, explosive materials or flammables are
present, or in dusty environments.
Avoid any contact with the circuit being measured if no measurements are being
carried out.
Avoid any contact with exposed metal parts, with unused measuring probes, etc.
Do not carry out any measurement in case you find anomalies in the instrument such
as deformation, breaks, substance leaks, absence of display on the screen, etc.
Pay special attention when measuring voltages higher than 20V, since a risk of
electrical shock exists.
In this manual, and on the instrument, the following symbols are used:
Warning: observe the instructions given in this manual; 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 instrument has been designed for use in environments of pollution degree 2.
It can be used for VOLTAGE and CURRENT measurements on installations with CAT
IV 600V, CAT III 690V to earth and between inputs.
We recommend following the normal 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.
In case the lack of indication of the presence of voltage may represent a danger for the
operator, always carry out a continuity measurement before carrying out the
measurement on the live system, in order to confirm the correct connection and
condition of the leads.
Only the leads supplied with the instrument guarantee compliance with the safety
standards. They must be in good conditions and replaced, if necessary, exclusively
with HT original accessories.
Do not test circuits exceeding the specified voltage limits.
Do not perform any test under environmental conditions exceeding the limits indicated
in § 6.2.1.
Check that the battery is correctly inserted.
Make sure that the LCD display and the rotary 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 rotary switch, disconnect the test leads from the circuit being
measured.
When the instrument is connected to the circuit being measured, do not touch any
unused terminal.
During current measurement, any other current near the clamps may affect
measurement precision.
When measuring current, always put the conductor as near as possible to the middle of
the clamp jaw, to obtain the most accurate reading.
Do not measure resistance in case external voltages are present; even if the
instrument is protected, an excessive voltage may cause malfunction
Before attempting any resistance measurement, cut off power supply from the circuit to
be measured and make sure that all capacitors are discharged, if present
While measuring, if the value or the sign of the quantity being measured remain
unchanged, check if the HOLD function is enabled.
1.3. AFTER USE
When measurement is complete, set the rotary switch to OFF to 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 what measurement
category, commonly called overvoltage category, is. § 6.7.4: Measured circuits, reads:
Circuits are divided into the following measurement categories:
Measurement category IV is for measurements performed at the source of 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 installation.
Measurement category II is for measurements performed on circuits directly
connected to the low-voltage installation.
Examples are measurements on household appliances, portable tools and similar
equipment.
Measurement category I is for measurements performed on circuits not directly
connected to MAINS.
Examples are measurements on circuits not derived from MAINS, and specially
protected (internal) MAINS-derived circuits. In the latter case, transient stresses are
variable; for that reason, the standard requires that the transient withstand capability of
the equipment is made known to the user.
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2. GENERAL DESCRIPTION
The instrument carries out the following measurements:
DC / AC, AC+DC TRMS voltage
DC / AC / AC+DC TRMS voltage with low impedance (LoZ)
DC / AC / AC+DC TRMS current with standard clamp transducers
AC TRMS current with flexible transducer clamps
Automatic recognition of AC and DC quantities
Inrush current (Dynamic INRUSH - DIRC)
Current/voltage harmonics up to the 25th and THD% calculation
Resistance and Continuity test
Current and voltage frequency
Overall earth resistance without RCD tripping
Loop impedance L-L, L-N and calculation of assumed short-circuit current
Test onA and AC general RCDs
Phase sequence with 1 terminal
Each of these functions can be selected by means of the appropriate switch. The
instrument is also equipped with function keys (see § 4.2), an analogue bargraph and
backlight. The instrument is also equipped with an Auto Power OFF function (which can be
disabled), which automatically switches off the instrument 15 minutes after the last time a
function key was pressed or the rotary switch was turned. To switch on the instrument
again, turn the rotary switch.
2.1. MEASURING AVERAGE VALUES ANDTRMS VALUES
Measuring instruments of alternating quantities are divided into two big families:
AVERAGE-VALUE meters: instruments measuring the value of the sole wave at
fundamental frequency (50 or 60 Hz).
TRMS (True Root Mean Square) VALUE meters: instruments measuring the TRMS
value of the quantity being tested.
With a perfectly sinusoidal wave, the two families of instruments provide identical results.
With distorted waves, instead, 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 instruments bandwidth). Therefore, by
measuring the same quantity with instruments from both families, the values obtained are
identical only if the wave is perfectly sinusoidal. In case it is distorted, TRMS meters shall
provide higher values than the values read by average-value meters.
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 1A intensity, circulating on a
resistor, dissipates the same energy that, during the same time, would be dissipated by a
direct current with an intensity of 1A". 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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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 checking that the packaging contains all components indicated in §
6.3.1. In case of discrepancy, please contact the Dealer.
In case the instrument should be returned, please follow the instructions given in § 7.
3.2. INSTRUMENT POWER SUPPLY
The instrument is supplied with 4x1.5V alkaline batteries type AAA IEC LR03, included in
the package. When batteries are flat, the symbol “” is shown on the display. To replace
the batteries, see § 6.1.
3.3. STORAGE
In order to guarantee precise measurement, after a long storage time, wait for the
instrument to come back to normal condition (see § 6.2.1).
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4. NOMENCLATURE
4.1. DESCRIPTION OF THE INSTRUMENT
CAPTION:
1. LCD display
2. arrow key
3. Key/
4. Key MODE/MXMNPK
5. Key H/H%/H
6. Key RCDIN/
7. Key GO/HOLD
8. Rotary selector switch
9. Input terminal COM
10.Input terminal VL
Fig. 1: Description of the instrument
4.1.1. Instrument’s initial screen
1. Turn the rotary switch to any position to switch on the instrument. The following initial
screen is shown on the display for a few seconds to identify the internal Firmware
version.
Fig. 2: Instrument’s initial screen
2. Turn the rotary switch to OFF to switch off the instrument.
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4.2. DESCRIPTION OF FUNCTION KEYS
4.2.1. Key GO/HOLD
Pressing the key GO/HOLD (for functions V, LoZV , and ) makes the instrument
hold the value of the quantity shown on the display. The message “HOLD” appears on the
display. Press the key again to exit the function. Pressing the key GO/HOLD (for functions
RCD , Ra Loop, , IRC) activates the corresponding measurement.
4.2.2. Key H/H%/H
Key H/H%/H (active in positions V, LoZV and ) allows the following operations:
Simple pressing of the key to display the amplitude of voltage and current harmonics
up to the 25th (Hdc, H01… H25) in absolute or percentage format in relationship with
the fundamentals of input signals (for voltage values VAC >0.5V and current values AC
> 0.5A and frequency in the range 42.5Hz ÷ 69Hz) and the percentage value of
parameter THD% (see § 9.4) as shown in Fig. 3. Use keys and /to
increase/decrease the order of the harmonic.
Fig. 3: Display of amplitude of harmonic analysis
Long pressing of the key (at least 2s) in order to activate the H2O (Higher Harmonic
Ordering) ordering function of the amplitude of harmonics. In these conditions, function
“HOLD” is automatically activated, symbol “” is shown on the display, the bargraph is
disabled and the instrument shows the value of amplitude of all harmonics between the
2nd and the 25th, in decreasing order from the harmonic with the highest value, as
shown in Fig. 4.
Fig. 4: Display of ordering of amplitude of harmonic analysis
In the example in Fig. 4, the harmonic with the highest value corresponds to the 7th.
Press key to observe the amplitude of the remaining harmonics and press key
H/H%/H again to switch between display in absolute and percentage values. Turn
the rotary switch to exit the function.
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4.2.3. Key MODE/MXMNPK
A simple pressing of key MODE/MXMNPK allows for the following operations:
Selection of measuring modes “AC”, “DC” and “AC+DC” in positions V, LoZV
Selection of measuring modes “AC”, “DC” and “AC+DC” and “IRC” (see § 4.2.8) in
position
Selection of clamp transducer type in current measurement between options “”
(optional standard clamps) and “ ” (optional flexible clamp) in position
Selection of measurement of Overall earth resistance without RCD tripping RCD
(RCDRa ), Overall earth resistance L-PE (100mA) and Loop impedance L-L, L-N in
position Ra Loop
Selection of measurement of tripping time at “½In”, “In”, “5xIn” and tripping current
“” of the RCD switch in position RCD
Selection of measurement of Resistance “” or Continuity test “” in position
A long pressing (>2s) of key MODE/MXMNPK allows for the activation/deactivation of
continuous detection of maximum value (MAX), minimum value (MIN), positive peak (Pk+),
negative peak (Pk-) of the quantity (voltage or current) to be measured. The values are
constantly updated and are displayed cyclically every time the same key is pressed. This
function is not active in position . Press and hold key MODE/MXMNPK (>2s) or use the
selector to exit the function.
4.2.4. Keys /and
A simple pressing of keys/and allows for the following operations:
Setting of the full scale value of flexible clamp transducer (optional accessory - option
"” ) in position among values: 30A, 300A, 3000A for AC current measurement.
Setting of the full scale value of standard clamp transducer (option “” ) in position
among values: 1A, 10A, 30A, 40A, 100A, 200A, 300A, 400A, 1000A, 2000A, 3000A
for AC and DC current measurement.
Selection of harmonic order “DC ÷ 25°” in positions V, LoZV and
Selection of calculation time of RMS value in DIRC function (see § 4.2.8).
Selection of limit on assumed contact voltage in positions Ra Loop and RCD
among the options: 25V, 50V (see § 4.2.10)
Zeroing of cable resistance in position (see § 5.4)
Long pressing (>2s) of key /allows activating/deactivating display backlight. This
function is activated in any position of the rotary switch and is automatically deactivated
after approx. 2 minutes’ idling.
4.2.5. Key RCDIN/
A simple pressing of key RCDIN/ allows for the following operations:
selection of rated tripping current of the RCD among the options: 30mA, 100mA,
300mA in position RCD.
A long pressing (>2s) of key RCDIN/ allows for the following operations:
Selection of the type of RCD among the options: “” (type AC), “” (type A) in
position RCD
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4.2.6. LoZ function
This mode allows carrying out AC/DC voltage measurement with a low input impedance, in
order to eliminate wrong readings due to parasite voltages for capacitive couplings.
CAUTION
By plugging the instrument between the phase and earth conductor,
because of the low impedance of the instrument during measurement, RCD
protections may trip while carrying out the test. If this test is to be carried
out, first carry out a measurement of at least 5s between phase and neutral
in the presence of voltage.
4.2.7. AC+DC function
The instrument is capable of measuring a possible presence of overlapping alternating
components on a generic direct waveform (voltage or current). This can be useful when
measuring typical impulsive signals of non-linear loads (e.g. welding machines, ovens).
4.2.8. Inrush current function (INRUSH)
Measurement of inrush current (see § 5.9) is intended as the recognition of an event
detected upon exceeding of a trigger threshold. If the instant value exceeds this threshold
(fixed, equal to 1%FS clamp), the instrument shows on the display the maximum Peak
value (calculated in 1ms) and the maximum RMS value calculated with a time which can
be selected among options: 16.7ms, 20ms, 50ms, 100ms (default), 150ms, 175ms and
200ms.
4.2.9. Disabling the Auto Power Off function
In order to preserve internal batteries, the instrument switches off automatically
approximately 15 minutes after it was last used. Press key MODE/MXMNPK or move
selector from OFF position to switch on the instrument. To disable the Auto Power Off
function, proceed as follows:
Switch off the instrument (OFF)
Press and hold key to switch on the instrument. The symbol “” disappears from
the display
Switch off and then on again the instrument or press key MODE/MXMNPK to enable
the function again.
4.2.10. Setting the contact voltage limit
In order to set the limit on contact voltage Ut, used in positions Ra Loop and RCD ,
proceed as follows:
1. Switch off the instrument (OFF)
2. Press and hold key /switch on the instrument by turning the rotary switch. The
screen in Fig. 5 – left side appears on the display with a flashing “Set” symbol.
Fig. 5: Setting the contact voltage limit
3. Press keys /or to select limit values 50V or 25V.
4. Press key GO/HOLD to confirm and go back to measuring screen.
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4.2.11. Setting the rated voltage in Loop/Ra measurement
To set the value of rated voltage necessary to instrument in order to calculate the
assumed short-circuit current in position Ra Loop, proceed as follows:
1. Select the position Ra Loop
2. Long press (>2s) the MODE/MXMNPK key. The followed screen appears on the
display with a flashing “Set” symbol.
Fig. 6: Setting the rated voltage in Loop measurement
3. Press keys /or to set the value of rated voltage (Phase-Earth, Phase-Neutral or
Phase-Phase) in range 100V ÷ 690V. Press and hold keys /or for a quick
setting of the desired value.
4. Press key GO/HOLD to confirm and go back to measuring screen.
4.2.12. Setting full scale of flexible clamp
The instrument can be used with flexible transducer clamp (optional accessory). For a
correct current measurement is necessary set the voltage full scale of the used clamp
(consider the user manual of the transducer in order to know the correct full scale).
Proceed as follows
1. Switch off the instrument (OFF)
2. Press and hold key MODE/MXMNPK switch on the instrument by turning the rotary
switch. The followed screen appears on the display:
Fig. 7: Setting full scale of flexible clamp
3. Press keys /or to set the full scale of used clamp between the options: 3VAC
(F3000U model) or 1VAC (other models)
4. Press key GO/HOLD to confirm and go back to measuring screen
5. The performed settings are saved at each re-boot
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5. OPERATING INSTRUCTIONS
5.1. DC VOLTAGE MEASUREMENT
CAUTION
The maximum input DC voltage is 690V. Do not measure voltages
exceeding the limits given in this manual. Exceeding voltage limits could
result in electrical shocks to the user and damage to the instrument.
Fig. 8: Use of the instrument for DC voltage measurement
1. Select position V
2. Insert the red cable into input terminal VLand the black cable into input terminal
COM/E/N.
3. Position the red lead and the black lead respectively in the spots with positive and
negative potential of the circuit to be measured (see Fig. 8). The display shows the
value of voltage.
4. If the display shows the message “>690V” (see Fig. 8), the maximum measurable value
has been reached.
5. When symbol "-" appears on the instrument’s display, it means that voltage has the
opposite direction with respect to the connection in Fig. 8.
6. To use HOLD, MAX/MIN/PK functions see § 4.2.
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5.2. AC, AC+DC VOLTAGE MEASUREMENT
CAUTION
The maximum input AC voltage is 690V to earth. Do not measure voltages
exceeding the limits given in this manual. Exceeding voltage limits could
result in electrical shocks to the user and damage to the instrument.
Fig. 9: Use of the instrument for AC voltage measurement
1. Select position V
2. Press the MODE/MXMNPK key until symbol “AC” or “AC+DC” is displayed. The
instrument automatically recognizes AC or DC signals.
3. Insert the red cable into input terminal VLand the black cable into input terminal
COM/E/N.
4. Position the red lead and the black lead respectively in the spots of the circuit to be
measured (see Fig. 9). The display shows the value of voltage. On the top of the
display on the right side, the value of voltage frequency is displayed. Press key
MODE/MXMNPK to display the value of frequency with a higher resolution.
5. If the display shows the message “>690V” (see Fig. 9), the maximum measurable value
has been reached.
6. If the display shows the messages “<32Hz” or “>1000Hz” (see Fig. 9), the value of
frequency is out of the measuring range 32Hz ÷ 1000Hz.
7. To use HOLD, MAX/MIN/PK, H/H%/H functions, see § 4.2
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5.3. AC, DC, AC+DC VOLTAGE WITH LOW IMPEDANCE (LOZ)
CAUTION
The maximum input AC/DC voltage is 690V to earth. Do not measure
voltages exceeding the limits given in this manual. Exceeding voltage limits
could result in electrical shocks to the user and damage to the instrument.
Fig. 10: Use of the instrument for AC/DC voltage measurement with LoZ function
1. Select position LoZV . The symbols “LoZ” and “DC” appear on the display.
2. Press key MODE/MXMNPK to select “AC” or “AC+DC” measurement. Anyway, the
instrument automatically recognizes AC or DC signals.
3. Insert the red cable into input terminal VLand the black cable into input terminal
COM/E/N.
4. Position the red lead and the black lead respectively in the positions of the circuit to be
tested (see Fig. 10) for AC voltage measurement or in the positions with a positive or
negative potential of the circuit to be tested (see Fig. 8) for DC voltage measurement.
The display shows the value of voltage. On the top of the display on the right side, the
value of voltage frequency is displayed. Press key MODE/MXMNPK to display the
value of frequency with a higher resolution.
5. If the display shows the messages “<32Hz” or “>1000Hz” (see Fig. 10), the value of
frequency is out of the measuring range 32Hz ÷ 1000Hz.
6. When symbol “-” appears on the instrument’s display, it means that voltage has the
opposite direction with respect to the connection in Fig. 8.
7. To use HOLD, MAX/MIN/PK, H/H%/H functions, see § 4.2
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5.4. RESISTANCE MEASUREMENT AND CONTINUITY TEST
CAUTION
Before attempting any resistance measurement, cut off power supply from
the circuit to be measured and make sure that all capacitors are discharged,
if present.
Fig. 11: Use of the instrument for resistance measurement and continuity test
1. Select the position.
2. Insert the red cable into input terminal VLand the black cable into input terminal
COM/E/N.
3. If necessary, short-circuit the measuring leads and press key to zero the resistance
of the measuring cables. The symbol “ZERO” appears on the display.
4. Position the test leads in the desired spots of the circuit to be measured (see Fig. 11).
The display shows the value of resistance.
5. If the display shows the message “>2000” (see Fig. 11) the maximum measurable
value has been reached.
6. Press key MODE/MXMNPK to select “” measurement, relevant to the continuity test,
and position the test leads in the desired positions of the circuit to be measured.
7. The value of resistance (which is only indicative) is displayed in and the instrument
sounds if the value of resistance is <30.
8. To use HOLD, MAX/MIN, H/H%/H functions, see § 4.2
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5.5. PHASE SEQUENCE AND PHASE CONCORDANCE WITH 1 TERMINAL
CAUTION
Input AC voltage to carry out this test must be in range 130V ÷ 690V with
a frequency in range 42.5Hz ÷ 69Hz.
This test can only be performed by touching the metal parts of the
conductors.
Fig. 12: Use of the instrument for phase sequence and phase concordance test
1. Select position . Message “PH 1” flashes on the display.
2. Insert the red lead into input terminal VL
3. Position the red lead onto phase L1 of the three-phase system to be tested (see Fig.
12). The following messages may appear on the display (see Fig. 13) to identify the
presence of a voltage signal with frequency out of range 42.5Hz ÷ 69Hz. In these
conditions, the instrument does not perform the test.
Fig. 13: Signal of voltage with wrong frequency
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4. In conditions of correct voltage and frequency, the instrument shows message “HOLD”,
symbols and “PH1” and the buzzer sounds continuously, waiting for a stable voltage
value on phase L1 to be detected (see Fig. 14 – left side).
Fig. 14: Detecting phase L1 and waiting for phase L2
5. Do not remove the lead from phase L1 until message “PH 2” appears flashing on the
display (see Fig. 14 – right side)
Fig. 15: Detecting phase L1 and waiting for phase L2
6. Position the red lead onto phase L2 of the three-phase system to be tested (see Fig.
12). In case passage between phase L1 and phase L2 takes more than 10s, the
instrument shows message “t.out” on the display (see Fig. 15 – left side). In conditions
of correct voltage and frequency, the instrument shows message “HOLD”, symbols
and “PH2” and the buzzer sounds continuously, waiting for a stable voltage value on
phase L2 to be detected (see Fig. 15 – right side)
7. Upon detection of a stable voltage value on phase L2, the instrument automatically
shows message “1.2.3.” (test OK) or message “2.1.3” (test NOT OK) as shown in Fig.
16.
Fig. 16: Results of phase sequence and phase concordance test
8. In case it is necessary to check phase concordance between two parallel three-phase
systems, after detection of phase L1 of the first system, position the lead on phase L1
of the second system. The correct final result is message “1.1-” (see Fig. 16 – right side)
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5.6. OVERALL EARTH RESISTANCE WITHOUT RCD TRIPPING
This function is performed in compliance with standards CEI 64-8 612.6.3, IEC/EN61557-6
and allows measuring the impedance of the fault loop, comparable to the overall earth
resistance in TT systems (see § 9.2).
CAUTION
The maximum input AC voltage is 690V to earth and between inputs. Do
not measure voltages exceeding the limits given in this manual.
Exceeding voltage limits could result in electrical shocks to the user and
damage to the instrument.
The measurement of overall earth resistance involves the circulation of a
current of approx. 15mA between phase and earth according to the
technical specifications of the instrument (see § 7.1). This could cause the
tripping of possible protections with lower tripping currents.
Fig. 17: Use of the instrument for measuring overall earth resistance with Schuko cable.
Fig. 18: Use of the instrument for measuring overall earth resistance with leads
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1. set the value of rated voltage Phase-Earth (see § 4.2.11)
2. Set the limit value of contact voltage (see § 4.2.10)
3. Select position Ra Loop.
4. Press key MODE/MXMNPK and select option “RCD Ra ”
5. In case the cable with Shuko plug is used, insert the red conductor into input terminal
VLand the green conductor into input terminal COM/E/N and connect the
instrument to the system to be tested (see Fig. 17). The value of voltage Phase-Earth
is shown on the display
6. In case measuring leads are used, insert the red conductor into input terminal VL
and the black conductor into input terminal COM/E/N and connect the instrument to the
system to be tested (see Fig. 18). The value of voltage Phase-Earth is shown on the
display
7. Press key GO/HOLD to activate the test. The following screens may appear on the
display for a few seconds to signal anomalous conditions in which the instrument does
not carry out the test:
Fig. 19: Anomalous situations upon pressing key GO/HOLD – Screen 1
Fig. 20: Anomalous situations upon pressing key GO/HOLD – Screen 2
Fig. 21: Anomalous situations upon pressing key GO/HOLD – Screen 3
L-PE Turn the Schuko plug in the socket to be tested
< 100V Input voltage < 100V. Check the electric mains
> 690V Input voltage > 690V. Check the electric mains
< 42.5Hz Input voltage frequency < 42.5Hz. Check the electric mains
> 69.0Hz Input voltage frequency > 69.0Hz. Check the electric mains
> 50V Dangerous voltage on PE conductor > 50V. Check the earth circuit
RCD RCD tripped check for possible current leaks to earth and disconnect the users from the
line to be tested
Ut Contact voltage above limit (25V/50V). Check the earth circuit and disconnect the users
from the line to be tested
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