NTi Audio Acoustilyzer AL1 - Manual (Page 63)

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CALIBRATE
The sensitivity may be adjusted with an
external calibrator.
• Select the dBSPL value field (default
= 114 dBSPL), press the enter key
and adjust the sound pressure level
as provided by your calibrator. Use up/
down keys for 1.0 dB
SPL
steps and left/
right keys for 0.1 dB
SPL
steps. The level
range 80 - 140 dB
SPL
is supported.
• Confirm the setting with the enter key.
• Produce the specific reference signal
with the calibrator onto the microphone.
• Press enter to execute the calibration,
whilst the reference signal of the
calibrator is still present.
• The frame WORKING ... followed by
the frame CALIBRATION FINISHED!
is shown centered on the calibration
screen.
• The new sensitivity is shown in mV/Pa.
• Enter the SPL/RTA mode and check the
calibration by applying the reference
signal again to the attached microphone.
The sound pressure level of the
calibrator shall be shown to confirm that
the calibration has carried out correctly.
In case of calibration problems various error
indications may be displayed, indicating
• too low or too high input level.
• the calculated sensitivity is out of the
range 2 - 80 mV/Pa.