HP RM500SL manual Other Hearing Instrument Tests, Turn the hearing instrument on

9Other Hearing Instrument Tests

9.1Section overview

In addition to the tests of ANSI S3.22, the RM500SL provides the following:

Distortion: Harmonic distortion at 2nd or 3rd harmonics and 2nd plus 3rd with input levels varying from 60 – 90 dB SPL.

Multicurve: 1 – 4 curves of coupler SPL or coupler gain for swept tones or pink noise in 1/12th octaves at selected input SPL of 0 or 40 to 90 dB in 5 dB steps. Can be used as a 1/12th octave spectrum analyzer by setting stimulus to 0 dB.

Battery drain: A 10 second test of battery current drain with no acoustic input, a 1 kHz 65 dB input SPL, and an average for 90 dB input SPL at the HFA or SPA frequencies selected in Setup. Optional battery pills are required.

Manual control: Coupler and HIT reference mic. SPL 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.

This section covers the following topics:

9.2: Harmonic distortion	9.6: Battery drain
9.3: Multicurve procedure	9.7: Manual control procedure
9.4: Multicurve results	9.8: Sound level meter using manual control
9.5: Spectral analysis in Multicurve

FastFacts 9.1: Other hearing instrument tests

9.2Harmonic distortion

This test measures harmonic distortion at 2nd or 3rd harmonics with input levels varying from 60 – 90 dB SPL. It also presents the sum of 2nd and 3rd harmonics as total harmonic distortion (THD). For hearing aids, this differs little from true THD.

1)Press <Tests>, then highlight and <PICK> [Distortion].

2)Refer to 7.11: Coupling the hearing instrument, 7.12: Positioning the hearing

instrument and 2.5: Battery pill use and care to prepare the instrument for testing.

3)Turn the hearing instrument ON.

4)Highlight and <Pick> [Start test].

5)Highlight and <PICK> [Harmonics], then highlight and <PICK> THD, 2nd or 3rd from the drop-down list.

6)Highlight and <PICK> [Input], then highlight and <PICK> the desired input level (60 – 90 dB SPL) from the drop-down list.

7)Press <Continue> to run the test. Distortion will be displayed at 1/3 octaves in graphic and in tabular form.

FastFacts 9.2: Harmonic distortion

0611 RM500SL User’s Guide Version 2.8 Page 46