NTi Audio Minilyzer ML1 - Manual (Page 21)

21
start of measurement: The sound pressure level measurement is
re-started every time
• The LEVEL SPL screen is entered
• The filter selection is changed.
• The clock is reset.
• The time weighting selection is changed.
• The bargraph range selection (RNGE) is changed.
Sound Pressure Level: The equivalent continuous sound pressure
level (also time-averaged sound level) is indicated in dBL
eq
, dBL
Aeq
,
dBL
Ceq
, depending on the selected filter in the filter menu.
Example:
• select in the main menu the filter A-WTD
• the measurement unit is changing to dBL
Aeq
and the minimum,
maximum and actual sound pressure level readings below are
A-weighted.
Below the time-averaged SPL reading one of the following values
may be displayed (select with the cursor keys):
• ACT: actual sound pressure level (SPL)
• MIN: minimum sound pressure level acquired during the
measuring time indicated by the clock. The minimum value is
stored until a new lower reading has been taken.
• MAX: maximum sound pressure level acquired during the
measuring time indicated by the clock. The maximum value is
stored until a new higher reading has been taken.
pause: The L
eq
and min./max. measurement may be freezed for a
user defined time.
• Select the pause symbol and press the enter key.
• The pause symbol is flashing.
• The actual SPL reading is continuously displayed and not
freezed.
• Select the pause symbol and press the enter key to continue the
measurement, visible by the continuing counting clock.
Clock: Duration in hours:minutes:seconds of the actual measurement;
select the clock and press the enter key to reset the time and restart
the measurement.
Measurement Functions