HP Omni 200-5000 Guia do Utilizador descarregar pdf (Página 54)

RM500SL

User's Guide Version 3.12



March 2015

12 On-Ear Measures - Setup

For accurate, repeatable measurements, the RM500SL must be properly set up and calibrated, the client must be

properly positioned and the probe tube must be properly positioned in the ear canal. Some common terms:

Real-Ear Unaided Response (REUR): SPL, or band SPL, in the open (unaided) ear canal for a given stimulus.

Real-Ear Unaided Gain (REUG): Difference, in dB, between the REUR and the stimulus SPL, or stimulus band

SPL.

Real-Ear Aided Response (REAR): SPL, or band SPL, in the ear canal for a given stimulus, with a working

hearing aid in place.

Real-Ear Aided Gain (REAG): Difference, in dB, between the REAR and the stimulus SPL, or stimulus band

SPL.

Real-Ear Saturation Response (RESR): The REAR obtained using a narrow-band signal at a level high enough to

saturate the hearing aid (usually 85 - 90 dB SPL).

Real-Ear-to-Coupler Difference (RECD): Difference, in dB, between the SPL produced in the ear canal and the

SPL produced in a coupler by the same sound source.

On-ear calibration facts

The probe microphone and its associated tubing does not have a flat frequency response. The on-ear calibration

process compares this response with the flat, factory-calibrated response of the on-ear reference microphone and

compensates all subsequent probe-tube measurements for this difference. It may be performed as often as desired

but will be invalidated at 12 am the following day or at 12 am the following Monday, depending on the choice of

Daily or Weekly calibration interval. After the calibration has expired, you will be prompted to calibrate

whenever you attempt a test that uses the on-ear measurement microphones.

It is suggested that a copy of the calibration curves for the probe modules when new be posted near the

RM500SL for comparison with daily or weekly curves. If there is a drift in calibration with time, the module

may need replacement. See Calibration check for probe module.

Calibration should be repeated if a probe module is replaced or if a probe-tube with different dimensions is

installed.

Calibration of on-ear probe microphone

Ensure the probe microphone assembly to be calibrated is plugged into the appropriate jack. See Microphone

connection and On-ear calibration facts

1. Press <Tests>, then highlight & <PICK> [On-ear measures], then highlight & <PICK> [Calibration].

2. Press the enlarged end of a probe tube as far as it will go, into the recessed opening at the top of the probe

module.

3. Position the open end of the probe tube in front of the reference microphone inlet and press it between the

posts as shown.

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HP Omni 200-5000 Guia do Utilizador Página 54