HT instruments HT9022 - Manual (Page 6)

HT9022
EN - 4
1.1. PRELIMINARY INSTRUCTIONS
• This clamp has been designed for use in environments of pollution degree 2.
• It can be used for CURRENT and VOLTAGE measurements on installations with
measurement category CAT IV 600V and CAT III 1000V. For a definition of
measurement categories, see § 1.4.
• We recommend following the normal safety rules devised by the procedures for
carrying out operations on live systems and using the prescribed PPE to protect the
user against dangerous currents and the instrument against incorrect use.
• Only the leads supplied with the instrument guarantee compliance with the safety
standards. They must be in good conditions and replaced with identical models, when
necessary.
• In case the lack of warning against the presence of voltage may constitute a danger for
the operator:
1. always carry out a continuity measurement before carrying out the measurement of
the live system to confirm the correct connection and condition of the leads;
2. before carrying out the critical measurement, carry out a measurement at a power
socket where voltage is surely present. As an alternative, make this verification at
your site before going to the unknown measuring point.
• Do not test circuits exceeding the specified current and voltage limits.
• Check that the battery is correctly inserted.
• Before connecting the test leads to the circuit to be tested, make sure that the switch is
correctly set.
• Make sure that the LCD display and the switch indicate the same function.
1.2. DURING USE
Please carefully read the following recommendations and instructions:
WARNING
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 activating the switch, remove the conductor from the clamp jaw or disconnect
the test leads from the circuit under test.
• When the instrument is connected to the circuit under test, do not touch any unused
terminal.
• Keep your hands always under the hand protection. This protection is always located in
a suitable position to guarantee a correct safety distance from possible exposed or live
parts (see
Fig. 3: hand protection
• Avoid measuring resistance if external voltages are present. Even if the instrument is
protected, excessive voltage could cause a malfunction of the clamp.
• 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, 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 function is enabled.
1.3. AFTER USE
• When measurement is complete, switch OFF the instrument.
• If the instrument is not to be used for a long time, remove the batteries.