Frye FONIX FP40D - Manual (Page 137)

Calibration 129
Appendix B: Calibration
Calibration
Your new instrument has been calibrated at the factory. However, from time to time, you will wish
to check it with an external source, a sound level calibrator. Frye Electronics offers the QUEST
QC-10 calibrator, especially adapted to our equipment, but other models can also be used.
While in the SETUP menu, push F4, CAL MIC(s).
Calibrating the Coupler /Reference Microphone
1. Place the 1” to 14 mm adapter in the QC-10 calibrator.
2. Place the coupler/reference (larger) microphone in the adapter. See Figure B-1
3. Turn on the calibrator, noticing the stated output (114 dB).
4. The measured output can be seen on the display. If it is higher or lower than the desired
output, you may adjust the calibration by using a small screwdriver at the REF GAIN con-
trol inside the sound chamber (Fig. B-2). You must first remove the sound box on FP40
units with serial no. 941655 and higher, and FP40-Ds with serial no. 944402 and higher.
Figure B-1 Figure B-2