HT instruments HT77N User Manual
ENGLISH
User manual
Copyright HT ITALIA 2012 Release EN 2.00 - 18/12/2012
HT77N
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
3. PREPARATION FOR USE ........................................................................................... 4
3.1. Initial checks ............................................................................................................................. 4
3.2. Instrument power supply.......................................................................................................... 4
3.3. Calibration ................................................................................................................................. 4
3.4. Storage ...................................................................................................................................... 4
4. OPERATING INSTRUCTIONS ..................................................................................... 5
4.1. Instrument description.............................................................................................................. 5
4.1.1. Description of the controls...................................................................................................... 5
4.1.2. Alignment marks and hand protection .................................................................................... 5
4.2. Description of functions keys................................................................................................... 6
4.2.1. /Data/Auto/Peak Hold key .................................................................................................. 6
4.2.2. Wide/50-60Hz/Compare key .................................................................................................. 7
4.2.3. Range key ............................................................................................................................. 7
4.2.4. Auto Backlight sensor ............................................................................................................ 7
4.3. Operating instruction ................................................................................................................ 8
4.3.1. AC Current measurement ...................................................................................................... 8
4.3.2. Leakage current measurement .............................................................................................. 9
5. MAINTENANCE.......................................................................................................... 10
5.1. General information ................................................................................................................ 10
5.2. Battery replacement ............................................................................................................... 10
5.3. Cleaning the instrument ......................................................................................................... 10
5.4. End of life ................................................................................................................................ 10
6. TECHNICAL SPECIFICATIONS................................................................................. 11
6.1. Technical characteristics ....................................................................................................... 11
6.1.1. Electrical specifications .........................................................................................................12
6.1.2. Reference guideline ..............................................................................................................12
6.1.3. General characteristics .........................................................................................................12
6.2. ENVIRONMENT ..................................................................................................................... 12
6.2.1. Environmental conditions for use ..........................................................................................12
6.3. Accessories............................................................................................................................. 12
6.3.1. Standard accessories ...........................................................................................................12
7. SERVICE .................................................................................................................... 13
7.1. Warranty conditions ............................................................................................................... 13
7.2. Service..................................................................................................................................... 13
EN - 1
HT77N
CAUTION
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 the symbol with the utmost attention.
Failure to comply with the caution notes and/or instructions may damage the
instrument and/or its components and be a source of danger for the operator.
Before and after carrying out the measurements, carefully observe the following
instructions:
Do not carry out any current measurement in humid environments.
Do not carry out any measurements in case gas, explosive materials or flammables are
present, or in dusty environments.
Avoid contact with the circuit being measured if no measurements are being carried out.
Avoid contact with exposed metal parts, with unused measuring probes, circuits, 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.
In this manual, and on the instrument, the following symbols are used:
CAUTION: observe the instructions given in this manual; an improper use could
damage the instrument or its components.
Double-insulated meter.
AC current
DC voltage
Ground reference
This symbol indicates that the clamp can operate on live conductors.
1.1. PRELIMINARY INSTRUCTIONS
This clamp has been designed for use in environments of pollution degree 2.
It can be used for CURRENT measurements, on installations with overvoltage category
III 300V. For a definition of the above-mentioned categories, see § 1.4
This instrument is not suitable for direct current measurements
Please take the standard safety precautions aimed at protect you against dangerous
electric currents and protect the instrument against incorrect use
Do not test circuits exceeding the specified current and voltage limits
Check that the battery is correctly inserted
EN - 2
HT77N
CAUTION
1.2. DURING USE
Please carefully read the following recommendations and instructions:
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 switching on the clamp, remove the conductor from the clamp jaw.
When the instrument is connected to the circuit under test, do not touch any unused
terminal.
During current measurement, any other current near the clamp may affect
measurement precision.
When measuring current, always put the conductor as near as possible to the middle of
the clamp jaw, as described in § 0, to obtain the most accurate reading.
While measuring, if the value or the sign of the quantity being measured remain
unchanged, check if the HOLD or PEAK HOLD function is enabled.
1.3. AFTER USE
When measurement is complete, switch off the clamp.
If the instrument is not to be used for a long time, remove the battery.
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. In § 6.7.4: Measured circuits, circuits
are divided into the following measurement categories:
(OMISSIS)
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.
EN - 3
HT77N
2. GENERAL DESCRIPTION
Dear Customer, thank you for choosing one of the instruments in our range. If used
according to the instructions given in this manual, the clamp you have just purchased will
guarantee accurate and reliable measures. The clamp is designed to guarantee maximum
safety, thanks to a newly conceived development, which ensures double insulation and
enables the clamp to reach CAT III 300V in compliance with standard IEC/EN61010-1.
The instrument carries out the following measurements:
AC TRMS current
AC TRMS leakage current
Peak value of AC current
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 replaced, please carefully follow the instructions given in
§ 7.
3.2. INSTRUMENT POWER SUPPLY
The instrument is supplied with two 1.5V AAA LR03 batteries, included in the package.
In order to prevent compromising its charge, the battery is not inserted in the instrument.
For battery installation, follow the instructions given in § 5.2.
The “ ” symbol appears when the battery is nearly discharged. Replace the battery,
following the instructions given in § 5.2.
3.3. CALIBRATION
The instrument has the technical specifications described in this manual. The instrument’s
performance is guaranteed for 12 months.
3.4. STORAGE
In order to guarantee precise measurement, after a long storage time under extreme
environmental conditions, wait for the instrument to come back to normal condition (see §
6.2.1).
EN - 4
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