Itm HT9021 User manual

©Copyright HT ITALIA 2012 Release EN 1.04 - 19/04/2012
ENGLISH
User manual
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HT9021
EN - 1
Contents:
1. SAFETY PRECAUTIONS AND PROCEDURES ..........................................................2
1.1. Preliminary ........................................................................................................................ 2
1.2. During use......................................................................................................................... 3
1.3. After use............................................................................................................................ 3
1.4. Measuring (overvoltage) categories definitions................................................................. 3
2. GENERAL DESCRIPTION ...........................................................................................4
2.1. TRMS and Mean value measuring instruments ................................................................ 4
2.2. True Root Mean Square value and Crest Factor definitions ............................................. 4
3. PREPARATION FOR USE ...........................................................................................5
3.1. Initial.................................................................................................................................. 5
3.2. Power supply..................................................................................................................... 5
3.3. Calibration ......................................................................................................................... 5
3.4. Storage.............................................................................................................................. 5
4. OPERATING INSTRUCTIONS.....................................................................................6
4.1. Instrument description....................................................................................................... 6
4.1.1. Command description................................................................................................................. 6
4.1.2. Alignment marks......................................................................................................................... 6
4.2. Function key description.................................................................................................... 7
4.2.1. H key........................................................................................................................................... 7
4.2.2. key ........................................................................................................................................ 7
4.2.3. MODE key .................................................................................................................................. 7
4.2.4. MAX/MIN key.............................................................................................................................. 7
4.2.5. Hz% key...................................................................................................................................... 7
4.2.6. PEAK/REL key ........................................................................................................................... 7
4.3. Functions of rotary switch description ............................................................................... 8
4.3.1. AC Voltage measurement .......................................................................................................... 8
4.3.2. DC Voltage measurement .......................................................................................................... 9
4.3.3. Resistance measurement......................................................................................................... 10
4.3.4. Continuity test and Diode test................................................................................................... 10
4.3.5. Capacitance measurement....................................................................................................... 12
4.3.6. Temperature measurement ...................................................................................................... 13
4.3.7. AC and DC Current measurement ........................................................................................... 14
4.3.8. Frequency and Duty cycle measurement................................................................................. 14
5. MAINTENANCE .........................................................................................................16
5.1. General informations....................................................................................................... 16
5.2. Battery replacement ........................................................................................................ 16
5.3. Cleaning .......................................................................................................................... 16
5.4. End of life ........................................................................................................................ 16
6. TECHNICAL SPECIFICATIONS ................................................................................17
6.1. Characteristics................................................................................................................. 17
6.1.1. Safety........................................................................................................................................ 18
6.1.2. General data............................................................................................................................. 18
6.2. Environmental conditions ................................................................................................ 19
6.2.1. Climatic conditions.................................................................................................................... 19
6.3. Standard accessories...................................................................................................... 19
6.4. Optional accessories....................................................................................................... 19
7. SERVICE....................................................................................................................20
7.1. Warranty conditions......................................................................................................... 20
7.2. Service ............................................................................................................................ 20
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HT9021
EN - 2
1. SAFETY PRECAUTIONS AND PROCEDURES
This clamp complies with IEC/EN61010-1. For your own safety and in order to avoid
damaging the instrument, you’re recommended to keep to the instructions contained in this
manual and read carefully all the notes preceded by the symbol .
Take extreme care for the following conditions while measuring:
•Do not measure voltage or current in humid or wet environment.
•Do not use the meter in presence of explosive gas (material), combustible gas
(material), steam or dust.
•Insulate yourself from the object to be tested.
•Do not touch exposed metal (conductive) parts such as test lead ends, sockets, fixing
objects, circuits, etc.
•If you detect anomalies of testing end (metal part) and attachment of the meter such as
breakages, deformations, foreign substances, no display, etc., do not take any
measurement.
•Measuring voltage over 20V as it might cause human body electricity conduction.
The followings symbols are used on meter and in this manual:
Caution: refer to the instruction manual. An incorrect use may damage the tester
or its components
High Voltage ranger: electrical shock risk
Double insulated instrument
AC Voltage or Current
DC Voltage or Current
Ground reference
1.1. PRELIMINARY
•This apparatus has been designed for use in an environment of pollution degree 2.
Indoor use.
•It measures CURRENT and VOLTAGE on CAT IV 600V and CAT III 1000V plants. For
measurement categories please see § 1.4.
•You must comply with the usual safety regulations aimed at protecting you against the
dangerous electric current and protecting the instrument against an incorrect operation.
•Only the leads supplied with the instrument guarantee compliance with the safety
standards. They must be in good conditions and they must be replaced, if necessary,
with an identical model.
•Do not test or connect to any circuit whose voltage or current exceeds the specified
overload protection.
•Make sure that the batteries are installed correctly.
•Before connecting the test probes to the installation, check that the function selector is
positioned on the required measurement.
•Make sure that the LCD and the range indicator show the same as the function
desired.
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HT9021
EN - 3
1.2. DURING USE
Always keep to the instructions contained in this manual.
CAUTION
Non compliance with the CAUTIONs and/or the instructions may damage
the tester and/or its components or injure the operator.
•Before changing the switch position, take off the clamp jaw from the tested conductor
or the electrical circuit in order to avoid any accident
•When the clamp is connected to the circuits to be tested, never touch unused terminals
•When testing resistors, do not add voltage. Although there is a protection circuit,
excessive voltage would cause malfunctioning
•Before measuring current, remove the voltage-resistance test leads
•When measuring current, any strong current close to the clamp jaw will affect the
accuracy
•When measuring current, always put the tested conductor in the middle of the clamp
jaw in order to obtain a more accurate reading
•If the reading value or the sign indication remains unchanged during the measurement,
check if the HOLD function is active
1.3. AFTER USE
•Once the measurements are completed, turn the rotary switch to OFF.
•If you expect not to use the clamp for a long time, remove the battery.
1.4. MEASURING (OVERVOLTAGE) CATEGORIES DEFINITIONS
The norm EN 61010-1: Safety requirements for electrical equipment for measurement,
control and laboratory use, Part 1: General requirements, defines what measuring
category, usually called overvoltage category, is. On § 6.7.4: Measuring circuits, it says:
(OMISSIS)
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 in the building installation.
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 norm requires that the transient withstand capability of the equipment is made
known to the user.
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HT9021
EN - 4
2. GENERAL DESCRIPTION
HT9021 meter can perform the herewith measurements:
•DC and AC TRMS Voltage up to 1000V
•DC and AC TRMS Current up to 1000A
•Resistance and continuity test with buzzer
•Capacitance
•Frequency with test lead and jaws
•Duty cycle
•Diode test
•Temperature with type K probe
•AC voltage detection with and without contact with integrated sensor
Each parameter can be selected by rotating the 8 positions switch. To abilitate the hold
function the HOLD key is available. There are also the following keys: “MODE "MAX/MIN",
“Hz%“, “PEAK/REL” and “ ”. For their use please see § 4.2. The selected quantity
appears on a LCD display with indication of measurement units and functions. An
analogical bargraph it is also availbale
2.1. TRMS AND MEAN VALUE MEASURING INSTRUMENTS
Safety testers for alternate parameters are divided into two big families:
•MEAN VALUE instruments: instruments which measure only the value of the wave at
the fundamental frequency (50 or 60 Hz)
•TRUE ROOT MEAN SQUARE instruments, also defined as TRMS: instruments which
measure the true root mean square value of the quantity under test.
In presence of a perfectly sinusoidal wave, both families provide identical results. In
presence of distorted waves the readings are different. Mean value instruments provide
only the value of the fundamental wave while True RMS instruments provide the value of
the entire wave, including harmonics (within the passband of the instrument). Accordingly,
if the same quantity is measured with both kinds of instruments, the measured values are
identical only if the wave is purely sinusoidal. Should it be distorted, True RMS instruments
provide higher values than medium value instruments.
2.2. TRUE ROOT MEAN SQUARE VALUE AND CREST FACTOR DEFINITIONS
The current effective value is defined as follows: “In an interval of time equivalent to a
period, an alternate current with effective value having an intensity of 1A, by passing on a
resistor, disperses the same energy which would be dispersed in the same period of time
by a direct current having an intensity of 1A”. From this definition comes the numerical
expression: G= ∫
+Tt
t
dttg
T
0
0
)(
12The effective value is indicated as RMS (root mean square).
The Crest Factor is defined as the ratio between the Peak Value of a signal and its
effective value: CF (G)=
RMS
p
G
G. This value varies according to the waveform of the signal,
for a purely sinusoidal wave it’s worth 2=1.41. In presence of distortions the Crest Factor
assumes higher values as long as the wave distortion is higher.
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HT9021
EN - 5
3. PREPARATION FOR USE
3.1. INITIAL
The tester has been checked from a mechanical and electrical point of view before
shipment.
Every care has been taken to make sure that the instrument reaches you in perfect
conditions.
However, it’s advisable to make a rapid check in order to detect any damage which may
have occurred in transit. Should this be the case, enter immediately the usual claims with
the carrier.
Make sure that all the accessories listed in § 6.3 are contained in the package. In case of
discrepancies contact Your dealer.
In case of returning of the tester please keep to the instructions given in § 7.
3.2. POWER SUPPLY
The instrument is battery supplied. One battery 9V NEDA 1604 IEC 6F22 JIS 006P is
included in the package. Battery life: about 200 hours.When batteries are low, the symbol
“” appears on the display. Replace them immediately, following the instructions
given in § 5.2.
The instrument disposes of the Auto Power OFF function (not disable) consisting in an
automatic switching off 15 minutes of idleness
3.3. CALIBRATION
The tester complies with the technical features listed in this manual. Its performances are
guaranteed for one year.
3.4. STORAGE
In order to guarantee the accuracy of the measurements, after a period of storage under
extreme environmental condition, wait for the necessary time so that the tester returns to
normal measuring conditions (see environmental specifications, § 6.2.1).
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HT9021
EN - 6
4. OPERATING INSTRUCTIONS
4.1. INSTRUMENT DESCRIPTION
4.1.1. Command description
LEGEND:
1. Inductive clamp jaw
2. LED for AC voltage
detection
3. Jaw trigger
4. Function selector
5. HOLD / key
6. MODE, MAX/MIN,Hz%,
PEAK/REL function keys
7. LCD display
8. VΩCAP Temp input
jack
9. COM input jack
Fig. 1: Instrument description
4.1.2. Alignment marks
Put the conductor within the jaws on intersection of the indicated marks as much as
possible (see Fig. 2) in order to meet the meter accuracy specifications
LEGEND:
1. Alignment marks
2. Conductor
Fig. 2: Alignment marks
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HT9021
EN - 7
4.2. FUNCTION KEY DESCRIPTION
4.2.1. H key
By pushing “H” key the parameter measured value is frozen on the display and the symbol
”HOLD” appears on it.
This mode is disabled by pushing “H” key or moving the rotary switch.
4.2.2. key
Keep pressed the “H” key for the backlight activation. This light could help the operator
reading the display while he’s measuring in dark sites. For sake of battery saving after 10
seconds the light is automiatically switched off.
4.2.3. MODE key
By pushing MODE key the selection of double measured functions which are present at
display is possible. In particular this key is active in ΩCAP position to select among
resistance test, diode test, continuity test and capacitance test, and in Temp position to
select between °C and °F in temperature test and in 60A , 600A ,1000A position to
select between AC or DC current measurements
4.2.4. MAX/MIN key
By pushing MAX/MIN key the parameter maximum and minimum values are measured.
Both values are stored in memory and they can be shown cyclically when pressing “MIN
MAX” key. The display shows the symbol linked to the selected function: “MAX” for
maximum value, the symbol “MIN” for minimum value.
This mode is activated on each measurement except for continuity test, diode test
capacitance test, frequency test and duty cycle test
This mode is disabled keeping pressed MAX/MIN key or moving the rotary switch.
4.2.5. Hz% key
With rotary switch on , 60A , 600A and 1000A positions, the Hz% key permits to
select the frequency test (Hz) or the duty cycle test (%)
4.2.6. PEAK/REL key
With rotary switch on , , CAP and DC current the PEAK/REL key permits to perform
the zeroing of value at display and a relative measurement of the parameter under test.
By pushing PEAK/REL key the instrument takes the actual parameter’s value as on offset
and performs a relative measurement. The relative value is displayed, it’s calculated as
actual value – offset value, the “REL” symbol is shown at display and the bargraph is
disabled.
This mode is disabled for resistance test, continuity test, AC current test, temperature test,
frequency test, duty cycle test and diode test and with MAX/MIN mode activated. This
mode is disabled pressing PEAK/REL key or moving the rotary switch
With rotary switch on 60A , 600A or 1000A positions the PEAK/REL key permits to
activated the maximum peak measurement of AC current (calculated with response time
<10ms). The “P” symbol is shown at display and the value is continuously updated by the
meter.
This mode is disabled pressing PEAK/REL key or moving the rotary switch
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HT9021
EN - 8
4.3. FUNCTIONS OF ROTARY SWITCH DESCRIPTION
4.3.1. AC Voltage measurement
CAUTION
Maximum input for AC Voltage measurements is 1000Vrms. Do not take
any voltage measurement exceeding this limit in order not to risk electrical
shock or damaging the tester
Fig. 3: Taking AC voltage measurements
1. Approach the meter closest to AC source and note the turn on of red LED which is
placed to the bottom of clamp jaws (see Fig. 1 – part 2) which detect the AC voltage
2. Rotate the switch on position
3. Insert the red test lead plug into VΩCAP Temp jack and the black test lead plug
into COM jack (Fig. 3)
4. Connect the two long ends of test leads to the desired circuit, then reading will be
displayed
5. When “O.L." symbol is displayed, the result exceeds the maximum value that the
instrument is capable of measuring
6. For HOLD, MAX/MIN and REL features please refer to § 4.2
CAUTION
•Due to the high input impedance is possible that the meter performs the
zero of the display taking longer
•The possible blinking values shown at display with open input terminals
are not a problem of the meter and these values will not be added to
the measured value
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HT9021
EN - 9
4.3.2. DC Voltage measurement
CAUTION
Maximum input for DC Voltage measurements is 1000V. Do not take any
voltage measurement exceeding this limit in order not to risk electrical
shock or damaging the tester.
Fig. 4: Taking DC voltage measurements
1. Rotate the switch on position
2. Insert the red test lead plug into VΩCAP Temp jack and the black test lead plug
into COM jack (Fig. 4)
3. Connect the two long ends of test leads to the desired circuit, then reading will be
displayed
4. When “O.L." symbol is displayed, the result is over the maximum value that the
instrument is able to measure
5. For HOLD, MAX/MIN and REL features please refer to § 4.2
CAUTION
•Due to the high input impedance is possible that the meter performs the
zero of the display taking longer
•The possible blinking values shown at display with open input terminals
are not a problem of the meter and these values will not be added to
the measured value
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