Basic Sound Chamber Tests 89
8. Press [START] to perform the measurement. You should see CIC appear in
the Curve Characteristics box in the “Cor” column of the selected curve. If
you are using the FAST, COMPOSITE, or DIG SPEECH signal, press [STOP]
to end the measurement once it has stabilized.
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 Occluded Ear Simulator Option
The Occluded Ear Simulator (OES) Option consists of software correction fac-
tors and three special (MZ) couplers. Together, they allow you to simulate
the 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.
Note: The data results from the OES coupler will not be an exact duplicate for
results performed with a Zwislocki coupler.
