AC40 Service Manual Page 51
Select the “Transducer Calibration”
Place the transducer on the 2cc IEC 60318-5 (IEC126) coupler (Figure 23)
Figure 23
Adjust the “Adjustment” slider until the calibration level is obtained on the measurement amplifier
(i.e. 90 dB SPL) (Figure 24)
Figure 24
Note: Remember to add or subtract the correction for your microphone
Check the frequency accuracy with a frequency counter. The accuracy has to better than ±1%
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