Sound Level Meter (Slm) Mode; Slm Menu Table - Extech Instruments SL355 User Manual

9. Sound Level Meter (SLM) Mode

Use the MENU button to access the SLM mode; the
the SLM mode is accessed. The Elapsed Timer will start automatically and the meter will begin
displaying the sound pressure level (SPL) measurements in db (decibels); use the RUN/PAUSE button
to pause and resume the timer.
In SLM mode the meter operates as a standard 'type 2' sound level meter, measuring and displaying
sound pressure levels from 60 to 130db or 70 to 140dB (the range is selectable as described later in
this procedure).
Read the measured Sound Pressure Level (SPL) on the LCD. For Sound Level measurements that fall
below the specified range, a down arrow icon will appear on the display; for readings above the
specified range, an up arrow icon will appear on the LCD. For readings > 115dBA, the headphone icon
appears. For readings > 140dBA, the Peak Detector (PK icon) appears along with the 'C' or 'Z' icon
depending on the selected Peak weighting mode ('C' for 'C' frequency weighting and 'Z' for flat or
linear response where no frequency weighting is applied).
In SLM mode the user can also view SEL (Single Event noise exposure Level) and L
continuous sound pressure Level) readings (refer to the SLM menu for navigation).
Refer to the Menu table and Screen Shots provided below illustrative instructions. In the Menu table
below, the user can edit the parameters shown on the right side of the thick black vertical line. When a
parameter is displayed, press and hold RUN/PAUSE until the parameter's setting flashes. Press ▲ or
▼ to change the setting and then press RUN/PAUSE again to save the change.
9.1 SOUND LEVEL METER (SLM) Menu Table
Display
SPL
(Use ▼ to scroll
items below)
DUR
LEQ
SEL
PK
Clr N
Description
Sound Pressure Level in
db
Test Duration
Equivalent Continuous
Noise Level
Sound Exposure Level
Peak SPL for C or Z
weighting
Clear (Erase data); Use
PAUSE/RUN button to
erase RUN data ('Y' for
Yes or 'N' for No)
SLM icon will appear on the meter's LCD when
Display
SPL
(Use ► to scroll items
below)
60 to 130db or
70 to 140db
F or S
Er (3, 4, 5 or 6 db)
A or C
PK-C or PK-Z
15
(Equivalent
eq
Description
Sound Pressure Level in db
Measurement Range
Time Weighting Fast/Slow
Exchange rate (Q)
Frequency weighting
'Z' (linear) or 'C' frequency
weighting for Peak SPL
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