NTi Audio Minilyzer ML1 - Manual (Page 22)

22
Time weighting: All sound pressure level measurements include
time weighting. A change in sound pressure level is read out on
the display with a shorter or longer response time.
Available response times, corresponding to IEC 60651, are
• SLOW (long attack- and release time)
• FAST (short attack- and release time)
• IMP (=impulse, very short attack and long release time)
Bargraph: The bargraph provides an analog display of the actual
sound pressure level.
Available bargraph ranges are:
• 20 - 100 dB
SPL
• 40 - 120 dB
SPL
• 60 - 140 dB
SPL
The selected bargraph range complies to the measurement range
of the instrument. To achieve accuracy of the measurement within
the specified tolerances the proper range must be selected, called
primary indicator range. The two range indicator arrows assist to
set the Minilyzer to the optimal range. As soon as the indicated
bargraph value is found lower than the primary indicator range, the
down arrow symbol below RNGE will start to move, symbolizing the
actual bargraph reading is inaccurate. The lower bargraph range
needs to be changed manually by selecting the moving left arrow
symbol and pressing the enter key.
Fig 3.4 SPL Panel with Overload
Measurement Functions