74 FONIX FP35 Hearing Aid Analyzer
4. Select CIC with the [<, >] keys.
5. Press [EXIT].
6. Select the desired source type with [F4].
7. Select the desired source amplitude with the [∨, ∧] keys.
8. Press [START/STOP] to perform the measurement. You should see CPLR CIC
appear on the right column of the screen. If necessary, press [START/STOP]
to end measurement.
Figure 3.6 shows the difference between a CIC hearing aid tested with an HA-1
coupler, and the same aid tested with a CIC coupler and correction factors.
Figure 3.6—CURVE 2 uses CIC coupler + correction factors
CURVE 1 uses 2-cc HA-1 coupler
3.7 OES Option
The Occluded Ear Simulator (OES) Option consists of software corrector fac-
tors and three special (MZ) couplers. Together, they allow you to obtain the
same data you would get with a standard ear simulator (IEC 711 or Zwislocki
coupler), providing the hearing aid or mold being tested is not vented. This
should give you a coupler measurement that more accurately reflects a real-ear
response of an occluded ear than a 2-cc coupler.
To use the OES Option:
