HT instruments HT322 User Manual
ENGLISH
User manual
Copyright HT ITALIA 2012 Release EN 2.00 - 19/04/2012
HT321 - HT322
Table of 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
3. PREPARATION FOR USE ........................................................................................... 4
3.1. Initial .................................................................................................................................. 4
3.2. Supply voltage ................................................................................................................... 4
3.3. Calibration ......................................................................................................................... 4
3.4. Storage .............................................................................................................................. 4
4. OPERATING INSTRUCTIONS ..................................................................................... 5
4.1. Instrument description ....................................................................................................... 5
4.1.1. Front panel description ............................................................................................................... 5
4.2. Description of function keys .............................................................................................. 6
4.2.1. HOLD Key................................................................................................................................... 6
4.2.2. R (RANGE) Key .......................................................................................................................... 6
4.2.3. MAX Key ..................................................................................................................................... 6
4.2.4. SEL Key ...................................................................................................................................... 6
4.2.5. Backlight key (only HT322) ................................................................................................. 6
4.2.6. Auto Power OFF ......................................................................................................................... 6
4.3. Measurements ................................................................................................................... 7
4.3.1. DC Voltage measurement .......................................................................................................... 7
4.3.2. AC Voltage measurement .......................................................................................................... 8
4.3.3. Resistance measurement ........................................................................................................... 9
4.3.4. Diode test and Continuity test .................................................................................................. 10
4.3.5. Temperature measurement (only HT322) ................................................................................ 11
5. MAINTENANCE .......................................................................................................... 12
5.1. General information ......................................................................................................... 12
5.2. Battery replacement ........................................................................................................ 12
5.3. Cleaning .......................................................................................................................... 12
5.4. End of life ........................................................................................................................ 12
6. TECHNICAL SPECIFICATIONS ................................................................................. 13
6.1. Technical features ........................................................................................................... 13
6.1.1. Safety ........................................................................................................................................ 14
6.1.2. General data ............................................................................................................................. 14
6.2. Environment .................................................................................................................... 14
6.2.1. Environmental conditions ......................................................................................................... 14
6.3. Accessories ..................................................................................................................... 14
6.3.1. Standard accessories ............................................................................................................... 14
6.3.2. Optional accessories ................................................................................................................ 14
7. SERVICE .................................................................................................................... 15
7.1. Warranty conditions......................................................................................................... 15
7.2. After-sale service............................................................................................................. 15
EN - 1
HT321 - HT322
1. SAFETY PRECAUTIONS AND PROCEDURES
This meter is compliance 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 .
When taking measurements:
Avoid doing that in humid or wet places.
Avoid doing that 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 liquid, blind display etc.
Be particularly careful when measuring voltages exceeding 20V to avoid risks of
electrical shocks.
The following symbols are used:
CAUTION - refer to the instruction manual - an improper use may damage the
instrument or its components.
Danger high voltage: risk of electric shocks.
Double insulated meter.
AC voltage.
DC voltage.
1.1. PRELIMINARY
This instrument has been designed for use in environments of pollution degree 2
It can be used for VOLTAGE measurements on installations of CAT III 1000V or CAT
IV 600V
This instrument is not suitable for AC voltage and current measurements of not
sinusoidal signals
Only the original test leads supplied along with the instrument guarantee compliance
with the safety standards in force. They must be in a good conditions and, if necessary,
replaced with identical ones
Do not test nor connect to any circuit exceeding the specified overload protection.
Do not take measurements under environmental conditions exceeding the limits
indicated in § 6.1.1. and § 6.2.1
Make sure that batteries are correctly installed
Before connecting the test probes to the installation make sure that the rotary selector
is positioned on the right function
Make sure that LCD and rotary selector indicate the same function
EN - 2
HT321 - HT322
1.2. DURING USE
Read the recommendations which follow and the instructions in this manual:
CAUTION
An improper use may damage the instrument and/or its components or injure
the operator.
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
When measuring resistors do not add any voltage. Although there is a protection
circuit, excessive voltage could cause malfunctioning.
If during measurement the displayed values remain constant check whether the HOLD
function is active
1.3. AFTER USE
After using the instrument turn it off.
If you expect not to use the instrument for a long period remove the battery to avoid
leakages of battery liquids which may damage its inner components.
1.4. MEASURING (OVERVOLTAGE) CATEGORIES DEFINITIONS
IEC/EN61010-1: Safety requirements for electrical equipment for measurement, control
and laboratory use, Part 1: General requirements, gives a definition of measuring
category, usually called overvoltage category. § 6.7.4: Measuring circuits:
(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.
EN - 3
HT321 - HT322
2. GENERAL DESCRIPTION
This meter performs the herewith measurements:
DC Voltage
AC sine voltage
Resistance
Continuity test
Diode test
Temperature with type K probe (only HT322)
All selectable by means of a 6-position rotary selector (including OFF position). Also are
available the HOLD key to hold the displayed value, the R key for manual selection of
measure ranges, the MAX key for measure of maximum value and SEL key for selection
between diode test and continuity test and temperature measures in °C or °F (only
HT322).
The selected quantity is displayed with indication of measuring unit and active functions.
The instrument disposes of an Auto Power Off function consisting in an automatic
switching off 15 minutes after last selector rotation.
3. PREPARATION FOR USE
3.1. INITIAL
This instrument was checked both mechanically and electrically prior to shipment. All
possible cares and precautions were taken to let you receive the instrument in perfect
conditions. Notwithstanding we suggest you to check it rapidly (eventual damages 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 § 6.3.1 are included. Should you
have to return back the instrument for any reason please follow the instructions mentioned
in § 7.
3.2. SUPPLY VOLTAGE
The instrument is supplied by 2x1.5V batteries type IEC AAA LR03. When batteries are
low, a low battery indication is displayed. To replace/insert batteries please refer to § 5.2.
3.3. CALIBRATION
The instrument complies with the technical specifications contained in this manual and
such compliance is guaranteed for 1 year. Annual recalibration is recommended.
3.4. STORAGE
After a period of storage in extreme environmental conditions exceeding the limits
mentioned in § 6.2.1 let the instrument resume normal measuring conditions before using
it.
EN - 4
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