Audioscan Axiom - Manual (Page 50)

Axiom ® User's Guide Version 1.8  May 2015
10 Other Test Box Measures
In addition to the tests of ANSI S3.22, the Axiom also provides the following tests in the test box:
Manual control: Coupler and test box reference mic. SPL and coupler mic. distortion at selected 1/12th octave
frequencies and stimulus SPL of 0 and 40 – 90 dB in 5 dB steps. Can be used as a dual channel sound level
meter with 1/12th octave, A and C filters.
Multicurve procedure
Multicurve generates 1 to 4 output or gain response curves using either pink noise or swept pure tones at input
levels ranging from 40 – 90 dB SPL and 0 dB (off).
1. Click then click [Multicurve] from the Test box column.
2. Refer to Coupling the hearing instrument, Positioning the hearing instrument use and care to prepare the
instrument for testing.
3. Turn the instrument ON.
4. Click on button 1, 2, 3 or 4 in the Test column.
5. Select the Stimulus window, then either [Pink noise] or [Swept] from the drop-down list.
6. Click on the Level window for the selected Test, then select a stimulus level from the drop-down list.
7. Click on to run a sweep or to capture a pink noise curve; press to abort the test.
8. To measure another response curve, click on another test button; to overwrite a curve, click on its test button.
To change scale from dB SPL to dB Gain, highlight & <PICK> the Scale window.
Multicurve results
1. Output curves for the noise signal are in 1/12th octave bands. They will be approximately 18 dB lower than
pure tone curves for a linear instrument.
2. Gain curves for a linear instrument will be the same for both swept and pink noise test signals.
3. For compression instruments, both gain and output curves may be expected to differ for the two test signals.
4. See Test Box Measures - Setup to change screen appearance.
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