Frye FONIX FP40D - Manual (Page 61)

Coupler Measurements 53
6. Press F2 or F3 (selected in step 3) to turn the CIC correction factors ON.
7. Test as usual. See Section 3.4.2.
See Figure 3.7 for a comparison of a CIC aid tested with an HA-1 coupler and the same aid tested
with a CIC coupler and correction factors.
Figure 3.7—CIC vs. HA-2 comparison
3.8 The OES Option
The OES (Occluded Ear Simulator) Option allows you to simulate the test results you would get
using a standard ear simulator (IEC 711 or Zwislocki coupler), provided the hearing aid or mold
being tested in not vented. It consists of three MZ couplers (MZ-1, MZ-2, and MZ-3) and corre-
sponding correction factors.
To use the OES Option:
1. Use the proper MZ coupler and connect the aid as usual. See Figure 3.8A.
2. Press F1 to enter the General Setup Menu.
3. Use the AMPLITUDE and FREQUENCY knobs to select MAIN F2 or MAIN F3.
4. Press START/STOP repeatedly to select OES.
5. Press F1 to return to the Main Coupler Screen.
6. Press F2 or F3 (selected in step 3) to turn the OES correction factors ON.
7. Test as usual. See Section 3.4.2.
Corrections will be made to all measurement curves, data displays, and individual measurements.
See Figure 3.8B for a comparison of an aid tested with an HA-2 coupler, and the same aid tested
with an MZ-3 coupler and OES correction factors.