HT instruments HT401 - Manual (Page 3)

HT401
EN - 2
1. PRECAUTIONS AND SAFETY MEASURES
The instrument has been designed in compliance with Directive IEC/EN 61010-1 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. Before and after carrying out
the measurements, carefully observe the following instructions:
 Do not carry out any measurement in humid environments.
 Do not carry out any measurements in case gas, explosive materials or flammables are
present, or in dusty environments.
 Avoid any contact with the circuit being measured if no measurements are being
carried out.
 Avoid any 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.
 Use extreme care when voltage exceeds 20V. This kind of voltage can cause electric
shock
The following symbols are used in this manual:
CAUTION: observe the instructions given in this manual; improper use could
damage the instrument or its components.
High voltage danger: electrical shock hazard.
Double-insulated meter.
AC voltage or current.
DC voltage or current.
Ground reference
1.1. PRELIMINARY
INSTRUCTIONS
 This instrument has been designed for use in environments of pollution degree 2
 It can be used for VOLTAGE and CURRENT measurements on installations with
overvoltage CAT III 1000V and CAT IV 600V
 Please take the standard safety precautions aimed at protecting you against dangerous
electrical currents and protecting 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 be replaced with identical models,
when necessary
 Do not test circuits exceeding the specified voltage limits
 Do not perform any test under environmental conditions exceeding the limits indicated
in § 6.2.1.
 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 rotary switch indicate the same function.