HTA102
EN - 6
4.3.
DESCRIPTION OF FUNCTION KEYS
4.3.1. Key
ON/OFF
Pressing key
ON/OFF
allows turning on the instrument. Press and hold key
ON/OFF
until
the countdown
“
3
”
,
“
2
” “
1
”
is over and with indication
“
P-OFF
”
shown on the display to turn
off the instrument.
4.3.2. Key
HLD
Pressing key
HLD
activates/deactivates function
HOLD
, i.e. the value of the quantity
measured is frozen on the main display. Symbol "HOLD" appears at the bottom of the
display. Key
HLD
is also used to confirm parameters when setting the system date/time
(see § 4.3.9) and the sampling interval (see §).
4.3.3. Key
Pressing key allows activating/deactivating the display
’
s backlight. The same key can be
used to define the sampling interval during a recording carried out by the instrument (see §
5.2).
4.3.4. Key
A/C
Press key
A/C
to select weighting curves A or C. Curve
“
A
”
is used for generic
measurements of sound pressure level (SPL), while curve
“
C
”
is used for SPL
measurements with low-frequency components. In case weighting C gives much higher
results than weighting A, many low-frequency noise components are present. Indications
“
dBA
”
(weighting A) or
“
dBC
”
(weighting C) are shown on the display.
4.3.5. Key
LEV
Press key
LEV
to select measuring range (see Fig. 2
–
part 6). The following ranges are
available:
30
80dB
(low),
50
100dB
(medium),
80
130dB
(high),
30
130dB
(Autorange). Message
“
AUTO
”
(see Fig. 2
–
part 7) appears when
“
Autorange
”
is selected.
Message
“
UNDER
”
(see Fig. 2
–
part 1) appears when the measured value is lower than
the minimum value of the selected range. Message
“
OVER
”
(see Fig. 2
–
part 4) appears
when the measured value is higher than the maximum value of the selected range. Key
LEV
is used also when setting system date/time (see § 4.3.9).
4.3.6. Key
F/S
Press key
F/S
to select integrations:
“
FAST
”
used for measuring short SPL (once every
125ms) or
“
SLOW
”
used to evaluate the average value of SPL changing over time
(once every second).
4.3.7. Key MAX MIN
Press key
MAX MIN
to activate/deactivate measurement of Maximum and Minimum
values of sound pressure level (SPL). Before using this function, select the most
appropriate range (see § 4.3.5). Symbols
“
MAX
”
or
“
MIN
”
appear on the top of the display
and the Maximum or Mini mum values are shown on the display. These values are
automatically updated, as soon as the instrument measures a higher (MAX) or lower (MIN)
value. Press and hold key
MAX MIN
(>2s) to quit and go back to measuring mode.
4.3.8. Key
REC
Press key
REC
to activate/deactivate recording of sound pressure level (SPL) on the
instrument (see § 5.2).
