No. 39110 04-05
Full-on gain curve
Frequency response curve and
effect of tone control
OSPL 90 curve and effect of
output limiting control
Full-on acoustic gain frequency response curve
Basic frequency response curve
and effect of tone control
OSPL
90
curve and effect of
output limiting control
Note:
(1) Production number (serial
number) is indicated at the
upper rear side of the unit.
(2) M a n u f a c t u r e r ' s n a m e i s
imprinted at the lower rear
side of the unit.
TECHNICAL DATA
(
According to ANSI standard S3.22 1996
)
Maximum-OSPL90
130 dB (1200 Hz)
HFA-OSPL90
127 dB
HFA-full-on Acoustic Gain
52 dB
Reference Test Gain
50 dB
Frequency Range
100 Hz to 6800 Hz
Equivalent Input Noise Level
20 dB
Total Harmonic Distortion
500 Hz: 8.0% 800 Hz: 3.0% 1600 Hz: 3.0%
HFA-SPLIV
112 dB at 31.6 mA/m
AGC
OPC (Output AGC)
Attack/Recovery Time
Attack: 0.25 msec/Recovery: 32 msec
Operating Switch
O-T-M
Output Limiting Control
OPC (range: 24 dB)
Tone Control
TONE H, TONE L
Gain Control
Main VR (range: 38 dB)
Battery Type/Supply Voltage
13 (13P)/1.3 V
Battery Current/Battery Life
13:
1.24 mA/Approx. 210 h
13P: 1.24 mA/Approx. 160 h
Dimensions/Weight
3.75 × 1.27 × 0.88 cm/4.2 g
(excluding battery)
(Typical value with E1 hook)
TECHNICAL DATA
(
)
Reference Test Frequency
1600 Hz
OSPL90
131 dB
500 Hz
126 dB
Peak
136 dB
Full-on Acoustic Gain
55 dB
Equivalent Input Noise Level
17 dB
Total Harmonic Distortion
500 Hz: 2.0% 800 Hz: 1.0% 1600 Hz: 1.0%
Induction Coil Sensitivity
89 dB at 1 mA/m
AGC
OPC (Output AGC)
Attack/Recovery Time
Attack: 0.25 msec/Recovery: 32 msec
Operating Switch
O-T-M
Output Limiting Control
OPC (range: 24 dB)
Tone Control
TONE H, TONE L
Gain Control
Main VR (range: 38 dB)
Battery Type/Supply Voltage
PR48 (PR48P)/1.3 V
Battery Current / Battery Life
PR48:
1.24 mA/Approx. 210 h
PR48P: 1.24 mA/Approx. 160 h
Dimensions/Weight
3.75 × 1.27 × 0.88 cm/4.2 g
(excluding battery)
(Typical value with E1 hook)
According to IEC standard Pub. 60118-0-1983
Amendment 1-1994
Opening / closing the control cover
1. Insert a screwdriver into the
notch of the control cover, as
shown in Fig. 1, and push the
cover down.
(Only the top section of the
cover will open.)
2. When the top of the cover opens, insert the screwdriver into the
clearance, as shown in Fig. 2, and push the cover out to open it fully.
3. To close the cover, push the entire cover in with finger.
Adjusting the controls
The scales of the tone control (TONE H, TONE L)
and output limiting control (OPC) are shown in the
illustration (Values shown in bold are printed on
the unit.). Use the numbers given on a scale as a guide when adjusting
the control. For information on volume control positions, see the section
"Volume control positions for 2000 Hz hearing level".
z
Tone control (TONE H)
As you turn the control from "N" towards "H",
the low range is attenuated and the high range
is emphasized. To make the adjustment using
numerical values, calculate the value as
follows.
TONE H setting = HL (2000 Hz) - HL (500 Hz)
z
Tone control (TONE L)
As you turn the control from "N" towards "L", the high range is
attenuated and the low range is emphasized. Each increment of the
printed scale corresponds to a change of about
4 dB at 4000 Hz.
Normally, the control should be left in the factory-
default position (N). If acoustic feedback (howling)
is a problem or when the hearing level in the low
range seems notably worse than in the high range, turn the control
towards "L".
z
Output limiting control (OPC)
Turning the control towards the left reduces the
maximum output level of the hearing aid. Set the
control to a position which matches the average
hearing level. The average hearing level can be
determined according to the following equation.
Average hearing level =
HL (500 Hz) + { 2 × HL (1000 Hz) } + HL (2000 Hz)
4
* About batteries
The generally recommended battery type for the
HB-41 is the PR48, but when the OPC control is
set in the range indicated by the arrows in blue,
the PR48P should be used. With the PR48, the
sound may briefly be interrupted at high levels. The PR48P eliminates
this problem, but this battery type has a slightly shorter service life.
Volume control positions for 2000 Hz hearing level