Audioscan Axiom - Manual (Page 64)

Axiom ® User's Guide Version 1.8  May 2015
15 RECD measurement
The RECD (real-ear to coupler difference) may be individually measured to improve the accuracy of hearing aid
fittings. The measurement procedure may be accessed by clicking on the [RECD] button located on the
Speechmap screen.
Calibration of RECD transducer
Calibration of RECD transducer
RECD values are stored and expressed as referenced to the HA-1 (ITE) coupler, however for ease of
measurement we calibrate the RECD transducer in the HA-2 (BTE) coupler.
1. Connect the RECD transducer to the RECD jack on the underside of the test chamber. Prepare the system for
test box tests. See Microphone connection, Calibrating test box reference microphone.
2. Click on and select [Speechmap] from either the [Test box] or [On-ear] menus.
3. Click on the [RECD] button to access the RECD setup poster.
4. Click on the [RECD] list button and select [Measure] from the menu. Then, click on .
5. If a valid RECD transducer calibration exists, go to RECD on-ear response.
6. If no transducer calibration exists or the measurement interval has been exceeded, connect the RECD
transducer to the HA-2 (BTE) coupler.
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