HT instruments HT326 User Manual
ENGLISH
User manual
Copyright HT ITALIA 2012 Release EN 2.00 - 09/05/2012
HT326
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 .................................................................................................................................. 5
4.2. Description of function keys .............................................................................................. 6
4.2.1. HOLD key ................................................................................................................................... 6
4.2.2. R (RANGE) key .......................................................................................................................... 6
4.2.3. REL key ...................................................................................................................................... 6
4.2.4. SEL key ...................................................................................................................................... 6
4.2.5. Backlight key ( ) .................................................................................................................... 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. DC Current measurement .......................................................................................................... 9
4.3.4. AC Current measurement ......................................................................................................... 10
4.3.5. Resistance measurement ......................................................................................................... 11
4.3.6. Continuity test ........................................................................................................................... 12
4.3.7. Diode test .................................................................................................................................. 13
4.3.8. Frequency and Duty Cycle measurement ................................................................................ 14
4.3.9. Capacitance measurement ....................................................................................................... 15
5. MAINTENANCE ......................................................................................................... 16
5.1. Batteries and fuse replacement ....................................................................................... 16
5.2. Cleaning .......................................................................................................................... 16
5.3. End of life ........................................................................................................................ 16
6. TECHNICAL SPECIFICATIONS ................................................................................ 17
6.1. Technical features ........................................................................................................... 17
6.1.1. Reference standards ................................................................................................................ 19
6.1.2. General data ............................................................................................................................. 19
6.2. Environment .................................................................................................................... 19
6.2.1. Environmental conditions ......................................................................................................... 19
6.3. Accessories ..................................................................................................................... 19
6.3.1. Standard accessories ............................................................................................................... 19
6.3.2. Optional accessories ................................................................................................................ 19
7. SERVICE .................................................................................................................... 20
7.1. Warranty conditions ......................................................................................................... 20
7.2. After-sale service ............................................................................................................. 20
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HT326
1. SAFETY PRECAUTIONS AND PROCEDURES
This meter is in compliance with IEC/EN61010-1 guideline 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 risk 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 or current.
DC voltage or current.
1.1. PRELIMINARY
This instrument has been designed for use in environments of pollution degree 2.
It can be used for VOLTAGE and CURRENT measurements on installations of
overvoltage CAT III 1000V and CAT IV 600V.
This instrument is not suitable for measurements of non sine wave voltage and current.
When using the instrument always respect the usual safety regulations aimed at
protecting you against the dangerous electric currents and protecting the instrument
against incorrect operations.
Only the leads supplied with the instrument guarantee compliance with the safety
standards in force. They must be in 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 § Errore. L'origine riferimento non è stata trovata. and § 6.2.1.
Make sure that batteries are properly 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.
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HT326
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.
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HT326
2. GENERAL DESCRIPTION
This meter performs the below listed measurements:
DC Voltage
AC sine wave Voltage
DC Current
AC sine wave Current
Resistance
Continuity
Diode test
Frequency
Duty cycle
Capacitance
All selectable by means of a 10 position rotary selector (including OFF position). In
addition there are the HOLD key to hold the displayed value, the R key for manual
selection of measuring ranges, the REL key for relative measurements and SEL key for
selection between Frequency and Duty Cycle or for selection of DC and AC Current
measurements.
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 or function selection.
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 § 5.1.
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 under extreme environmental conditions exceeding the limits
mentioned in § 6.2.1 let the instrument resume normal measuring conditions before using
it.
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HT326
4. OPERATING INSTRUCTIONS
4.1. INSTRUMENT - DESCRIPTION
4.1.1. Front panel
CAPTION:
1. LCD display
2. HOLD Key
3. R Key
4. REL Key
5. SEL Key
6. Backlight Key
7. Function selector
8. Input terminal A
9. Input terminal
VHz
10. Input terminal COM
Fig. 1: Instrument description
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HT326
4.2. DESCRIPTION OF FUNCTION KEYS
4.2.1. HOLD key
By pressing HOLD key the measured value is frozen on the display where the symbol
"HOLD" appears. Press again HOLD to disable this function and resume normal operation.
4.2.2. R (RANGE) key
By pressing R key, the manual mode is activated and the “AUTO” symbol disappears from
the display. Press R cyclically to change the measuring range and fix the decimal point on
the display.
To exit this function keep R key pressed for at least 1 second or rotate the selector to
another position.
4.2.3. REL key
By pressing REL the relative measure is activated. The meter sets the display to zero and
saves the actual value as reference. The “REL” symbol is shown at display. This function
is not active on Hz, Duty Cycle, Continuity Test and Diode Test measurements. Pressing
again the key to exit from this function.
4.2.4. SEL key
By pressing SEL key the selection of a double measured function on the display is
possible. In particular this key is active only in Hz and Duty position and to select between
AC and DC current measure.
4.2.5. Backlight key ( )
By pressing key it’s possible to activate the backlight function on the display. The
function automatically disabled itself after some seconds and is available on each position
of the rotary selector
4.2.6. Auto Power OFF
The instrument automatically turns off 15 minutes after the last pressure of keys or the last
selector rotation. To resume operation pressing HOLD key or turn the selector on OFF and
turn on the instrument again.
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