Frye FONIX FP40D User Manual

Page 138

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130

FONIX FP40 Portable Hearing Aid Analyzer

Calibrating the Probe Microphone

1. Place the probe calibration adapter in the 1” to 14 mm adapter as show in Figure B-3

2. Put the probe tube in the adapter, pushing it completely through, as shown in Figure B-4

Proceed as in Fig. B-1, except observe the measured output for the probe microphone and adjust
the calibration at the control marked PROBE GAIN.

Figure B-3

Figure B-4

Compensating Probe Microphone to Reference Microphone.

Since it is not necessary to compensate the probe microphone often, and an unintentional use of
this function could cause measurement problems, the compensation function is hidden under CAL
MIC(S). To further insure that it is not enabled accidentally, you must go to SETUP from the cou-
pler measurement mode, not the probe mode.

1. Make sure that REFERENCE MIC is ON under PROBE SETTINGS.

2. Exit PROBE by pushing F5.

3. Place Reference Microphone and Probe Microphone together in the sound chamber at the

reference point. See Figure 5.6.1.1A.

4. Close the sound chamber lid.

5. Push F1 SETUP MENU.

6. Push F4 CAL MIC(S).

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