D
‐
0125127
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C
22
4.
Calibrate
Probe
Tube
as
described
earlier
in
this
manual
on
page
15.
5.
Measure
and
place
the
probe
tube
in
the
ear
canal.
(Use
chart
to
the
left).
6.
Complete
a
Real
Ear
Measurements
UNAIDED
(REUR).
a.
ISTS
or
file
input
b.
Peak
Measures
c.
1/3
Octave
resolution
7.
Complete
a
Real
Ear
Measurement
AIDED
(REAG)
8.
Using
the
On
‐
Top
mode,
make
any
adjustments
needed
to
the
hearing
instrument
so
that:
a.
The
REM
curve
for
Quiet
Speech
(50
dB)
is
within
3
to
5
dB
of
all
of
the
points
on
the
prescription
curve.
b.
The
REM
curve
for
Conversational
Speech
(65
dB)
is
within
3
to
5
dB
of
all
of
the
points
on
the
prescription
curve.
c.
The
REM
curve
for
Loud
Speech
or
sounds
(80
dB)
is
approximately
10
dB
below
the
UCL
curve.
9.
If
measuring
for
Insertion
Gain
(REIR),
then
it
is
suggested
that
REUR
(no
hearing
aid
seated
in
the
canal)
and
REAG
(hearing
aid
seated
in
the
canal
and
functioning)
be
completed.
After
the
REUR
is
run,
a
curve
will
be
plotted
by
the
software
on
the
REUG
screen
as
well.
It
is
suggested
because
REIR
=
REAG
–
REUG.
See
the
description
of
each
measurement
under
REM
tests
in
the
manual,
by
clicking
on
F1
or
by
clicking
on
the
question
mark
symbol
at
the
top
right
of
the
window.
Stimulus
Signal
Types
Pure
Tone:
A
pure
sine
wave.
Crest
Factor
=
1.41
(3.0dB)
Broadband
Noise
(BBN):
Uniform
random
noise
with
normal
(Gaussian)
amplitude
distribution.
Can
be
weighted
to
White,
Pink,
Speech
ANSI,
and
Speech
Byrne
(see
below.)
Pseudo
Random
Noise
(PRN):
A
"synthetic"
broadband
random
noise.
It
is
less
uniform
than
BBN,
has
lower
spectral
density
and
random
volleys.
Can
be
weighted
to
White,
Pink,
Speech
ANSI,
and
Speech
Byrne
(see
below.)
ICRA
Noise:
This
stimulus
was
developed
for
measuring
characteristics
of
non
‐
linear
instruments.
The
noise
is
weighted
to
Byrne
LTASS.
ISTS:
(International
Speech
Test
Signal)
Initiated
by
European
Hearing
Instrument
Manufacturing
Association
(EHIMA.)
This
signal
is
based
on
natural
recordings
of
21
female
speakers
in
six
different
languages
‐
American
English,
Arabic,
Chinese,
French,
German
and
Spanish.
The
signal
is
largely
non
‐
intelligible
because
of
segmentation
and
remixing.
The
speech
material
was
filtered
to
Byrne
LTASS.
Crest
Factor:
9.23
(19.3dB)
Rainbow
Passage:
Natural
recordings
of
several
voices
reciting
the
rainbow
passage.
Shaped
to
Byrne
LTASS.
Broadband
Noise
Weighting
White:
This
is
essentially
no
weighting
or
filtering.
The
White
Noise
has
flat
power
spectral
density.
Power
at
every
frequency
is
equal.
Because
the
density
of
frequencies
(individual
cycles)
raises
with
frequency,
there
is
more
energy
in
high
octaves.
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