Chapter 6 167
2-CC Targets
The 2-cc target screens allow you to measure hearing aids using a coupler in a
sound chamber and compare them to a target. This type of testing is especially
useful when fitting a patient who is unable to sit still for a real-ear measure-
ment, such as an infant or a young child. There are two 2-cc Target screens
available: the Coupler Target screen, which converts real-ear targets into coupler
targets, and the Coupler EarSim screen, which converts coupler measurements
into simulated real-ear measurements. The real-ear option is required to access
these screens.
The Coupler Target screens convert real-ear targets into coupler targets so that
you can compare them to coupler measurements. Targets and measurements can
be displayed in either dB SPL or dB GAIN.
The Coupler EarSim screen uses the opposite approach, displaying actual real-
ear targets. When coupler measurements are taken, the response curves are
converted, using average or measured RECD transforms, into simulated real-ear
measurements, which can then be directly compared to the displayed real-ear
targets. Two displays are available: Insertion Gain and SPL. When the SPL dis-
play is selected, the patient’s HTL and UCL values are also displayed on the
screen. These HTL and UCL values are identical to the ones that would be dis-
played in the real-ear SPL screen.
The Coupler Multicurve (described in Chapter 3), Coupler Target, and Coupler
EarSim screens are all connected to each other by the [NEXT] and [BACK] keys,
similar to the way that the real-ear screens are connected to each other. Any
measurements taken in one screen are automatically converted to the other
screens, minimizing your measurement time.
Coupler
Multicurve
Coupler
Target
Coupler
EarSim
