Wrecd Measurement; Calibration Of Wrecd Transducer - audioscan verifit User Manual

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11 WRECD measurement

The WRECD (Wideband Real-Ear to Coupler Difference) may be individually measured to improve the

accuracy of hearing aid fittings. The measurement procedure may be accessed by selecting WRECD from the

On-ear tests list on the home menu or from the Audiometry poster within Speechmap.

WARNING: Foam eartips are for single-patient use only

WARNING: The WRECD transducer may be adversely affected if it comes in contact with a magnet. Do not

store where it may come in contact with any permanent magnet. If contact with a magnet is suspected,

transducer re-calibration is recommended prior to any patient measurements,

WRECD values are stored and expressed as referenced to the 0.4 cc wideband coupler. A calibration of the

Audioscan RECD transducer in this coupler is required at a minimum of weekly.

1. Connect the WRECD transducer to the WRECD jack on the Probe Dock. Prepare the system for test box

tests. See Microphone connection, Calibrating test box reference microphone.

2. Choose WRECD from the On-ear list on the home menu.

3. Select the RECD coupling method that will be used on the ear. Audioscan software supports both foam

eartips and personal earmold, however this choice must be made prior to measurement.

4. Attach the TRIC adapter to the 0.4cc coupler and attach this to the blue coupler microphone.

5. Insert the nozzle of the WRECD transducer all the way into the opening of the TRIC.

6. Click

. This causes a broadband signal to be applied to the WRECD transducer and the 0.4cc coupler

SPL to be recorded and displayed.

7. Select Interval to toggle the measurement interval for the coupler response between daily and weekly. If set

to weekly, RECD transducer calibration will expire at 12 AM Monday morning.

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