NTi Audio Acoustilyzer AL1 User Manual

Page 63

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63

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.

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