HT instruments HT7051 - Manual (Page 3)

HT2055
EN - 2
1 PRECAUTIONS AND SAFETY MEASURES
The instrument has been designed in compliance with standards IEC/EN61557-1 and
IEC/EN61010-1 regarding electronic measuring instruments.
CAUTION
For the operator’s safety and to prevent damaging the instrument, follow the
procedures described in this manual and carefully read all notes preceded by
the symbol
.
Before and during measurements, carefully observe the following instructions:
 Do not perform any measurement in humid environments, in the presence of gas or
explosive or inflammable material or in dusty areas
 Even when no measurements are being performed, avoid any contact with the circuit
under test, with exposed metal parts, with unused measuring leads or circuits, etc.
 Do not perform any measurement when anomalies are found in the instrument, such as
deformations, breaks, substance leaks, no display view, etc.
 During instrument operation, the ventilation holes on casing of HT2055S unit should
always stay open to ensure enough air-flow for cooling
 Disconnect all test leads, switch off the instrument and remove the mains cord before
changing the fuse on the HT2055S unit
 Pay special attention when measuring voltages above 25V in special environments
(building yards, swimming pools, etc.) and 50V in ordinary environments, as there is
danger of electric shocks.
In this manual and on the instrument, the following symbols are used:
WARNING: Observe the instructions reported in the manual. An improper use
could damage the instrument and lead to dangerous situations for the operator.
AC voltage or current.
Instrument with double insulation.
1.1 PRELIMINARY INSTRUCTIONS
 This instrument (HT2055M) has been designed for use in an environment with pollution
level 2
 It may also be used to test industrial electrical systems up to CAT II 300V and CAT IV
50V to earth (HT2055S) and CAT IV 50V (HT2055M)
 Follow the usual safety rules to protect the operator from dangerous currents and
protect the instrument against improper use
 Never use the instrument standing on the floor, it must be placed on flat horizontal
surfaces
 Only the accessories supplied with the instrument guarantee safety standards. They
must be in good conditions and replaced, if necessary, with identical models
 Do not measure systems exceeding the current and voltage limit values specified
 Do not perform measurements under environmental conditions out of the limit values
indicated in this manual
 Before connecting the probes to the circuit under test, check that the correct function is
selected