AC40 Service Manual Page 33
Select “Transducer Calibration”
Place the transducer on the 6cc IEC 60318-3 (IEC 303) coupler (Figure 3)
Figure 3
Adjust the “Adjustment” slider until the calibration level is obtained on the measurement amplifier
(i.e. 90 dB SPL) (Figure 4)
Figure 4
Note: Remember to add or subtract the correction for your microphone
Check the frequency accuracy with a frequency counter. The accuracy has to be better than ±1%
Press “Next”, when the calibration level is obtained, to get the next frequency
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