HP Omni 200-5000 Guia do Utilizador descarregar pdf (Página 37)

RM500SL

User's Guide Version 3.12



March 2015

3. Press <Continue> to return to the test screen.

Hiding a curve does not erase it. To erase curves use the <Session> key.

1996 or 2003 ANSI standard

Automated tests of linear and AGC hearing aids may be conducted according to either the ANSI S-3.22-1996 or

ANSI S3.22-2003 test standards. For differences, see ANSI S3.22-1996 facts and ANSI S3.22-2003 facts

To select the standard to be used:

1. Press <Setup, then highlight and <PICK> [ANSI]

2. Highlight and <PICK> the version of the ANSI standard you wish to use.

3. Press <Continue> to exit

ANSI test frequencies

The Frequencies feature allows hearing instruments to be evaluated at the Special Purpose Average (SPA)

frequencies defined by ANSI S3.22, rather than the default High Frequency Average (HFA) frequencies. The

choice of SPA (or HFA) frequencies influences the average OSPL90, average full-on gain, reference test gain,

bandwidth and equivalent input noise. The frequencies at which distortion is measured are one-half the selected

SPA frequencies. You can also select the frequencies at which attack and release times are measured.

To change the averaging frequencies:

1. Press <Setup>, then highlight and <PICK> [ANSI].

2. Highlight and <PICK> the HFA/SPA button to generate a drop-down list box of alternate test frequencies.

3. Highlight the desired HFA/SPA test frequencies and press <PICK> to select.

To change the frequencies for attack and release time measurements:

In the list of available frequencies, highlight and <PICK> the frequencies to be used to measure attack and

release time.

Press <Continue> to exit.

Test box calibration facts

Test box microphone calibration establishes a correction curve for the uncalibrated test box reference

microphone by comparison with the factory calibrated coupler microphone. 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, the message window will turn

blue and you will be prompted to calibrate whenever you attempt a test that uses the test box microphones.

Your calibration curve should be similar to the one shown but may be at a different level. It should remain stable

over time. Irregularities in the calibration curve may be the result of not properly aligning the microphones. See

Calibrating test box reference microphone.

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HP Omni 200-5000 Guia do Utilizador Página 37