Basic Sound Chamber Tests 95
Measurement Settings
• Coupler Type: The type of coupler being used in making sound chamber
measurements. Selections of CIC and MZ turn on corresponding software
correction factors (see Sections 3.6 and 3.7). A selection of 2CC does not
apply correction factors to the curve but will note a 2-cc coupler was used
in the COR column of the Curve Characteristics Box. The NONE selection
will apply no corrections and leave the COR column blank.
• Distortion: Type of harmonic distortion used in a pure-tone measurement.
Choose between 2nd, 3rd, and TOTAL. See Section 2.3.1.4.
• Noise Red (Tone): Amount of pure-tone noise reduction used. See Section
2.3.1.2.
• Noise Red (Comp): Amount of composite noise reduction used. See
Section 2.3.2.1.
Source Settings
• Output Trans: Transducer used for the measurement. CHAMBER uses the
test box. TELECOIL uses the built-in telecoil or the ANSI 96 telewand.
• Static Tone: Status of individual measurement. Choose SINGLE to emit
a static tone in between composite measurements or pure-tone sweeps.
Choose AVG to emit a three frequency average between other measure
-
ments.
• Bias Tone: Amplitude of the bias tone used with Digital Speech. OFF
turns off the bias tone entirely.
• Composite Type: Type of composite signal used. Choose between
STANDARD and CHIRP. See Section 2.3.2.4.
• Composite Filter: Filter used in Composite and Digital Speech measure
-
ments. Choose between ANSI, ICRA and FLAT.
Aid Settings
• Aid Type: Type of hearing aid being measured. Choose between
STANDARD (linear), AGC, and ADAPTIVE AGC.
• Avg Freqs: Selection of three frequencies used in a three frequency aver-
age. See Section 2.3.1.1.
• Sweep Start Delay: The amount of time the 7000 test system presents the
first tone in a pure-tone sweep. See Section 2.3.1.3.
• Sweep Meas Delay: The amount of time each subsequent tone is pre-
sented before the measurement is made in a pure-tone sweep. See Section
2.3.1.3.
• Misc Start Delay: The amount of time the 7000 test system presents the
first tone in one of the following measurements: reference test gain mea
-
surements (in automated test sequences), averaging, harmonic distortion
measurements, and equivalent input noise measurements. See Section
2.3.1.3.
