NTi Audio Acoustilyzer AL1 - Manual (Page 26)

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Pause: The Leq, LCpeak and MAX/MIN measurements can be paused
• Select the PAUSE symbol and press the enter key.
• The PAUSE symbol flashes.
• The actual SPL value is continuously measured and displayed.
• Select the pause symbol and press the enter key to continue the
measurement; the clock continues to count.
Reset: Pressing the RESET icon restarts the measurement. The timer and
test results are reset.
Test Cycle Period: Applicable in SINGLE and REPEAT timer status only.
• SINGLE: Set to 10 min by default
• REPEAT: Set to 10 sec by default
Measurement Timer: Actual measurement in hours:minutes:seconds.
Big and Small Result: Two of the previously-listed measurements may be
display at the same time.
Time Weighting: All SPL measurements (SPL and MAX/MIN SPL)
are time-weighted measurements. Changes in the SPL level are
smoothed, resulting in quicker or slower change of the displayed value.
Available time weightings, corresponding to IEC 61672, are
• SLOW (long attack and release response time, t = 1s)
• FAST (short attack and release response time, t = 125ms)
The time weighting for the broad band values ( ) and the RTA ( )
are always the same.
Overload
The OVL (Overload) flashes if the input
voltage exceeds the selected input range
of the instrument. As long as the OVL is
flashing the displayed Leq and LCpeak
results are not accurate.