EN
G
HT12
USER MANUAL
1. PRECAUTIONS AND SAFETY MEASUREMENTS
This instrument complies with safety Standard IEC/EN61010-1
related to electronic measuring instruments. For your own safety and
to avoid damaging the instrument follow the procedures described in
this instruction manual and read carefully all notes preceded by this
symbol
CAUTION
Avoid measuring in humid or wet places
Avoid measuring in rooms where explosive
gas, combustible gas, steam or excessive dust
is present
Keep you insulated from the object under test
Do not touch exposed metal parts such as test
lead ends, sockets, fixing objects, circuits etc.
Avoid doing that if you notice anomalous
conditions such as breakages, deformations,
fractures, leakages of battery fluid, blind display
etc.
Be careful when measuring voltages exceeding
20V to avoid risks of electrical shock
The following symbols are used in user manual and on the meter:
CAUTION - refer to the instruction manual - an
improper use may damage the instrument or its
components
Double insulated meter
The instrument can clamp not insulated live cables
corresponding
to
the measurement
category
indicated on them
AC voltage or current
DC voltage or current
CAUTION
: this symbol indicates that equipment, its
accessories and battery shall be subject to a
separate collection and correct disposal
1.1 Preliminary instructions
CAUTION
This instrument has been designed for use in
environments with pollution degree 2
It can be used for
VOLTAGE
and
CURRENT
measurements
on installations with overvoltage
category CAT III 300V and CAT II 600V
Only the leads supplied with the instrument
guarantee
compliance
with
the
safety
standards in force. They must be under good
conditions and, if necessary, replaced with
identical ones
Do not test or connect to any circuit exceeding
the specified overload protection
Do
not
effect
measurements
under
environmental conditions exceeding the limits
indicated in § 8
Make sure that batteries are properly installed
Before connecting the test probes to the
installation, make sure that the function
selector
is
positioned
on
the required
measurement
Make sure that LCD and function selector
indicate the same function
When changing the range, first disconnect the
test leads from the circuit under test in order to
avoid any accident
When
the
instrument
is
connected
to
measuring circuits never touch any unused
terminal
If during measurement the displayed values
remain constant check whether the HOLD
function is active
1.2 Measuring overvoltage category definitions
According to the IEC/EN61010-1 guidelines the circuits are divided
into the following measurement categories:
CAT IV
is for measurements performed at the source of the low-
voltage installation
CAT
III
is for measurements performed in the building installation
CAT II
is for measurements performed on circuits directly
connected to the low voltage installation
CAT I
is for measurements performed on circuits not directly
connected to MAINS
2. GENERAL DESCRIPTION
HT12 performs the following measurements:
DC and AC voltage
DC and AC current by using integrated sensor fork clamp
Resistance and continuity test
Voltage and current frequency
All selectable by means of a 7-position function selector. Function
keys
DH
and
RH
in addition to an analogical bargraph are also
available (see § 5.1 and § 5.2). The selected quantity is displayed
with indication of measuring unit and active functions. The
instrument is provided with an Auto Power Off function consisting
in an automatic switching off 10 minutes after last pressure on
keys or rotation of selector. To resume normal operation, switch
on the instrument again
3. PREPARATION FOR USE
3.1 Initial checks
This instrument was checked both mechanically and electrically
prior to shipment. All possible cares and precautions were taken
to let you receive the instrument under perfect conditions.
Notwithstanding we suggest you to check it rapidly (any damage
may have occurred during transport
– if so please contact the
local distributor from whom you bought the item). Make sure that
all standard accessories mentioned in § 8 are included. Should
you have to return back the instrument for any reason please
follow the instructions mentioned in § 9
3.2 Supply voltage
The instrument is powered by 2x1.5V batteries AAA LR03
included in the packaging. When batteries are low the symbol
"
" is displayed. To replace/insert batteries follow the
instructions indicated in § 7
3.3 Calibration
The instrument complies with the technical specifications
contained in this manual and such compliance is guaranteed for
12 months
3.4 Storage
After a period of storage under extreme environmental conditions
exceeding the limits mentioned in § 8 let the instrument resume
normal operating conditions before using it
4. INSTRUMENT AND DISPLAY DESCRIPTION
Copyright HT ITALIA 2013 Release EN 1.02 - 15/02/2013
5. FUNCTION KEYS DESCRIPTION
5.1 DH key
By pressing
DH
key the measured value is hold on the display where
the symbols "H"
and “ ” appear. Pressing again
DH
to disable this
function and resume normal operation
5.2 RH key
By pushing
RH
key, t
he manual mode is activated, the “AUTO”
symbol disappears
and the symbol “ ” is displayed. To quit this
function keep
RH
key pressed for at least 1 second or rotate the
selector into another position. The Autorange mode is automatically
active whenever you switch on the meter
6. HOW TO PERFORM THE MEASUREMENTS
6.1 DC/AC Voltage measurement
CAUTION
Maximum input for AC/DC voltage measurements is
600V. Do not take any voltage measurement
exceeding this limit in order not to risk electrical shock
or damaging the meter
1. Rotate the selector on
or
position.
The “DC” or “AC” and
“AUTO” symbols are shown at display. Press
RH
key for the
selection of manual range (see § 5.2)
2. Connect the red and black test leads to the positive and negative
poles of the circuit under test respectively (for DC voltage). The
voltage value is displayed
3. If the message "
O
.
L
" is displayed the maximum voltage value
was exceeded
4. On DC voltage measurement the symbol "
-
" on the instrument
display indicates that voltage has opposite direction compared to
the previous connections
5. For Data HOLD feature see § 5.1
6.2 Current measurement with fork sensor clamp
CAUTION
Do not perform measurements on circuits with a
voltage exceeding 600V AC/DC between phases or
exceeding 300V AC/DC between phase and ground
to avoid possible shock hazard
Do not perform measurements with test leads
connected to the circuit under test
Do not apply strong vibrations to the clamp sensor
and keep the fingers behind the protective bar
during measurements
6.2.1 DC Current measurement
1. Rotate the selector on
position
.
The “DC” and “AUTO” symbols
are displayed. Press
RH
key for the selection of manual range
(see § 5.2)
2.
Perform zeroing operation turning the adjust knob
which is
present on the central part of the clamp sensor. The
“0.0” value
should be displayed to perform correct measurements
3. Put the conductor in the fork of clamp sensor at the centre of the
arrows keys which are present in the frontal side (see picture)
and respect the current direction as indicated by the arrow key
which is present on the meter sideways
4. The current value is displayed. The symbol "
-
" on the instrument
display indicates that the current has opposite direction
compared to the previous connection
6.2.2 AC Current measurement
1. Rotate the selector onto
position
.
The “AC” and “AUTO”
symbols are displayed. Press
RH
key for the selection of manual
range (see § 5.2)
2. Put the conductor in the fork of clamp sensor at the centre of the
arrows keys which are present in the frontal side (see picture)
and respect the current direction as indicated by the arrow key
which is present on the meter sideways
3. The current value is displayed
4. For Data HOLD feature see § 5.1
6.3 Resistance and Continuity test measurements
CAUTION
Before taking resistance measurements on circuit
remove power from the circuit under test and
discharge all capacitors
1. Rotate the selector onto
/
position.
The “M ” and “
O.L
”
symbols are displayed. Press
RH
key for the selection of manual
range (see § 5.2)
2. Connect the test leads to the circuit under test. The resistance
value is displayed
3. The continuity test is always active and the buzzer sounds when
resistance values are lower than 30 . In Manual mode the
“ ”
symbol is displayed only in the 340 range
6.4 Frequency measurement
CAUTION
Do not perform measurements on circuits with a
voltage exceeding 600V AC/DC between phases or
exceeding 300V AC/DC between phase and ground
to avoid possible shock hazard
6.4.1 Voltage frequency measurement
1. Rotate the selector on
Hz
position. Press
RH
key for the
selection of manual range (see § 5.2)
2. Connect the test leads to the circuit under test. The frequency
value (in kHz or MHz) is displayed
6.4.2 Current frequency measurement
1. Rotate the selector on
Hz
position. Press
RH
key for the
selection of manual range (see § 5.2)
2. Put the conductor in the fork of clamp sensor at the centre of
the arrows keys. The value (in kHz or MHz) is displayed
DO NOT CONNECT SIMULTANEOUSLY THE TEST LEADS
AND THE CLAMP SENSOR TO THE INSTALLATION
7. BATTERY REPLACEMENT
When the "
" low battery indication is displayed the batteries
must be replaced as follows:
1. Switch
OFF
the meter
2. Remove the protection holster from the instrument
3. Remove the fixing screw and the battery compartment cover
4. Remove batteries and replace with new ones of the same type
5. Replace battery compartment cover and holster
8. TECHNICAL SPECIFICATIONS
The accuracy is referred to 23°C± 5°C, <75%RH
AC Current
Overload protection: 72A AC/DC for 10s
DC Current
Overload protection: 72A AC/DC for 10s
AC Voltage
Input impedance: 10M ; Overload protection: 720V AC/DC for 10s
DC Voltage
Input impedance: 10M ; Overload protection: 720V AC/DC for 10s
Resistance and Continuity test
Frequency
Current sensitivity: 15A ; Voltage sensitivity: 30V
Safety: IEC/EN61010-1, IEC/EN61010-2-031, IEC/EN61010-2-032
Measurement category: CAT III 300V , CAT II 600V, Pollution degree: 2
Insulation: double insulation
Compliance with 2004/108/CE (EMC) and 2006/95/CE (LVD) Directives
Display: LCD, ¾ dgt, 3400 points with bargraph
Meas. Range
Resolution
Accuracy
0.0 60.0A
0.1A
(2.0%rd+5dgt) (50/60Hz)
Meas. Range
Resolution
Accuracy
0.0 60.0A
0.1A
(2.0%rdg+5dgt)
Meas. Range
Resolution
Accuracy
0.000 3.400V
0.001V
(1.5%rdg+5dgt) (50-400Hz)
0.00 34.00V
0.01V
0.0 340.0V
0.1V
0 600V
1V
Meas. Range
Resolution
Accuracy
0.000 340.0mV
0.001mV
(1.5%rdg+4dgt)
0.000 3.400V
0.001V
0.00 34.00V
0.01V
0.0 340.0V
0.1V
0 600V
1V
Meas. Range
Resolution
Accuracy
0.0 340.0
0.1
(1.0%rdg+3dgt)
Buzzer active for R<30
10
Only on 340 range
0.000 3.400k
0.001k
0.00 34.00k
0.01k
0.0 340.0k
0.1k
0.000 3.400M
0.001M
(5.0%rdg+5dgt)
0.00 34.00M
0.01M
(15.0%rdg+5dgt)
Meas. Type
Meas. Range
Accuracy
Current
0 10kHz
(0.1%rdg+1dgt)
Voltage
0 300kHz
Sampling rate: approx 400ms (approx 20ms bargraph)
Over range indication: “
O.L
” or “
-O.L
” symbols at display
Power supply: 2x1.5V alkaline batteries type AAA LR03 UM-4
Auto Power OFF: after 10 minutes of idleness (not disable)
Reference temperature/humidity: 23°C± 5°C (73°F ± 41°F) ; <75%RH
Working temperature/humidity: 0 40°C (32°F 104°F) ; <85%RH
Storage temperature/humidity: -20 60°C (-4°F 140°F) ; <85%RH
Max height of use: 2000m (6562ft)
Max diameter conductor : 6mm (0.2in)
Dimensions (LxWxH): 128x87x24mm (5x3x1in)
Weight (with batteries): 210g (7ounces)
Included accessories: batteries, user manual
9. SERVICE
9.1 Warranty conditions
This instrument is guaranteed for one year against material or
production defects, in accordance with our general sales conditions.
During the warranty period the manufacturer reserves the right to
decide either to repair or replace the product. Should you need for
any reason to return back the instrument for repair or replacement
take prior agreements with the local distributor from whom you
bought it.
Do not forget to enclose a report describing the reasons for returning
(detected fault). Use only original packaging. Any damage occurred
in transit due to not original packaging will be charged anyhow to the
customer
9.2 Service
Should the instrument not work properly, make sure that batteries are
correctly installed and working before contacting your distributor, also
check the test leads and replace them if necessary.
Should you need for any reason to return back the instrument for
repair or replacement take prior agreements with the local distributor
from whom you bought it.
Do not forget to enclose a report describing the reasons for returning
(detected fault). Use only original packaging. Any damage occurred
in transit due to not original packaging will be charged anyhow to the
customer. The manufacturer will not be responsible for any damage
to persons or things.
HT ITALIA SRL
Via della Boaria, 40
48018
– Faenza (RA) – ITALY
Tel: +39-0546-621002
Fax: +39-0546-621144
Web:
www.ht-instruments.com
Email:
www.
GlobalTestSupply
.com
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