HP (Hewlett-Packard) RM500SL Manuel D’Utilisation
0611
RM500SL User’s Guide Version 2.8
Page 46
9
Other Hearing Instrument Tests
9.1
Section overview
FastFacts 9.1: Other hearing instrument tests
9.2
Harmonic distortion
FastFacts 9.2: Harmonic distortion
In addition to the tests of ANSI S3.22, the RM500SL provides the following:
Distortion: Harmonic distortion at 2
nd
or 3
rd
harmonics and 2
nd
plus 3
rd
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 1/12
noise in 1/12
th
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.
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 1/12
th
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 1/12
a dual channel sound level meter with 1/12
th
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
This test measures harmonic distortion at 2
nd
or 3
rd
harmonics with input levels
varying from 60 – 90 dB SPL. It also presents the sum of 2
nd
and 3
rd
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 3
rd
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.