HT instruments HT154 - Manual (Page 3)

HT154
EN - 2
1. SAFETY PRECAUTIONS AND PROCEDURES
This apparatus conforms to safety standard EN 61010-1, relating to electronic measuring
instruments. For your own safety and that of the apparatus, you must follow the
procedures described in this instruction manual and especially read all the notes preceded
by the symbol
carefully
.
Take extreme care for the following conditions when measuring:
• Do not perform measurement under humid or wet environment.
• Do not operate the meter under the environment with explosive gas (material),
combustible gas (material), steam or filled with dust.
• If any unusual condition of testing end (metal part) and attachment of the meter such as
breakage, deformation, fracture, foreign substance, no display, etc., do not conduct any
measuring.
The herewith symbols are used:
CAUTION - refer to the instruction manual - an improper use may damage the
instrument or its components.
Meter double insulated.
Meter compliance to CE mark standards.
1.1. PRELIMINARY
• This instrument can be used for sound level measurement from 30dB up to 130dB and
frequency enclosed in 31.5
÷ 8kHz range.
• You must comply with the usual safety regulations aimed at protecting the instrument
against an incorrect operation.
• Calibrate the instrument before operation if the instrument was not in use for a long
time or operated at bad environment (see chapter 4.3.2)
• Check if the battery is installed correctly.
1.2. DURING
USE
Read the recommendation which follow and the instruction in this manual:
CAUTION
Non compliance with the warnings and/or the instructions for use may
damage the apparatus and/or its components or injure the operator.
• Do not operate the instrument at temperature and humidity environment external to
reference conditions of chapter 6.3.1.
• Wind blowing across the microphone would bring additional extraneous noise. Once
using the instrument in the presence of wind, it is a must to mount the windscreen to
not pick up undesirable signals.
• Keep the microphone dry and avoid severe vibration.
• During measuring, if the value of reading remains unchanged, check if the MAX/MIN
function is active.