Sennheiser HME 110 User manual

Instruction manual
HME 110
Headset
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HME 110 | 1
Important safety information
왘Please read this instruction manual carefully and
completely before using the product.
왘Always include this instruction manual when passing the
product on to third parties.
왘This instruction manual is also available on the Internet at
www.sennheiser-aviation.com or www.sennheiser.com.
Preventing health problems and accidents
왘Always maintain a distance of at least 3.94“ (10 cm)
between the ear cups and the cardiac pacemaker or
implanted defibrillator since the product generates
permanent magnetic fields.
왘Keep the product, accessory and packaging parts out of
reach of children who could swallow smaller pieces.
왘When using a headset, typical aircraft sounds (for
example, those from engines, propellers, warning alarms,
etc.) may sound different to you. Before operating any
aircraft, make sure that, while wearing the headset, you
can hear and recognize these sounds. Set the volume to
safe levels that do not interfere with your ability to hear
informational sounds and warning alarms.
왘If during flight operation you, as the pilot, operate your
connected device using the headset, this can limit your
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Important safety information
2 | HME 110
attention. During flight operation, do not use the headset
for making phone calls or listening to music.
왘The product is capable of producing sound pressure
exceeding 85 dB(A). In many countries 85 dB(A) is the
maximum legally permissible level for continuous noise
exposure during the working day. Do not listen at high
volume levels for long periods of time to prevent hearing
damage.
Preventing damage to the product and dysfunctions
왘Always keep the product dry and do not expose it to
extreme temperatures (hairdryer, heater, extended
exposure to sunlight, etc.) to avoid corrosion or
deformation.
왘Only clean the product with a soft, dry cloth.
왘Never repair or attempt to repair a defective product
yourself. Contact your Sennheiser partner or the
Sennheiser Service Department.
왘Only replace parts of the product whose replacement is
described in this instruction manual. All other parts of the
product must be replaced by your Sennheiser partner.
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Important safety information
HME 110 | 3
Intended use of the headset
Intended use of the product includes
• having read and understood this instruction manual,
especially the chapter “Important safety information” on
page 1,
• using the headset in helicopters, propeller and turboprop
aircraft and within the operating conditions as described
in this instruction manual.
“Improper use” means using the product other than as
described in this instruction manual, or under operating
conditions which differ from those described herein.
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HME 110 headset
4 | HME 110
HME 110 headset
The HME 110 pilot headset is characterized by the following
features:
• Passive headset with excellent noise attenuation
• Excellent comfort due to very low weight, soft ear pads
and padded headband
• Foldable headband for easy and space-saving transport
• Clear communications due to BKE 45-1 condenser
microphone with adjustable sensitivity
• Microphone can be easily positioned and worn on either
left or right side due to flexible microphone boom with
quick-fixing device
• Best possible freedom of movement due to unilateral
connection cable
• Optimum radio reception due to headphone system with a
wide frequency response
• Integrated volume control
• Adaption to the aircraft audio system via mono/stereo
switch
• Made in Germany, 10-year warranty
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Delivery includes
HME 110 | 5
Delivery includes
1 HME 110 headset
1 wind screen for microphone
1 cable clip
1 instruction manual
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Putting the HME 110 in operation
6 | HME 110
Putting the HME 110 in
operation
Connecting the headset
2
1
왘Connect the two jack plugs of the
headset to the corresponding jack
sockets of your audio system.
Jack plug Jack socket of the audio system
5.25 mm jack plug 1
(PJ-068 equivalent)
Microphone input
¼” (6.35 mm) jack plug 2Headphone output
Adjusting the headband
For good noise attenuation and best possible comfort, the
headset has to be adjusted to properly fit your head. To do
so, you can adjust the headband.
CAUTION!
Damage to the product due to squeezing of cables!
When adjusting the headband, the connection cable for the
headphones can be squeezed and damaged.
왘Make sure not to squeeze the headphones connection
cable when adjusting the headband.
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Putting the HME 110 in operation
HME 110 | 7
왘Wear the headset so that the headband runs over the top
of your head.
왘Adjust the length of the headband so that
– your ears are completely inside the ear pads,
– you feel even, gentle pressure around your ears,
– a snug fit of the headband on the head is ensured.
왘Final adjustment is best made in a noisy environment.
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Putting the HME 110 in operation
8 | HME 110
Positioning the microphone
To position the microphone boom on either the right or left-
hand side of the mouth:
왘Loosen the quick-fixing device.
왘Rotate the microphone boom by 180°.
왘Tighten the quick-fixing device.
Positioning the microphone towards the corner of the
mouth
왘Bend the flexible microphone boom so that the micro-
phone is placed at the corner of the mouth. Maintain a
distance of approx. 2 cm between microphone and mouth.
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Using the HME 110
HME 110 | 9
Using the HME 110
Switching between mono and stereo
operation
In general, you’ll receive a mono sound source so that the
mono/stereo switch can remain set to “MONO” (factory
setting).
To set the headset to stereo operation:
왘Remove the ear pad (see “Replacing the ear pads” on
page 14) from the ear cup with the microphone boom
attached.
왘Set the mono/stereo switch to “STEREO”.
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Using the HME 110
10 | HME 110
Adjusting the volume
WARNING!
Hearing damage due to high volume levels!
Listening at high volume levels for long periods
can lead to permanent hearing defects.
왘Before putting the headset on, set the
volume to a low level.
왘Do not continuously expose yourself to high
volumes.
왘Adjust the volume to a medium level. Make sure that you
can hear critical sounds such as warning alarms.
+
–
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Using the HME 110
HME 110 | 11
Adjusting the microphone gain “Mic Gain”
According to JTSO approval C58a, the microphone output
voltage is factory preset to 400 mV. If the microphone output
voltage is too high or too low for your audio system, it can be
readjusted on the microphone.
왘Use a small slotted screwdriver and turn the “Mic Gain
Adjustment” screw (see diagram) until you have reached
the desired setting.
BKE 45–1
MADE IN GERMANY
P/N 045–305–097
TSO - C58a
Mic Gain Adjustment
+
–
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Using the HME 110
12 | HME 110
Transporting the headset
For space-saving transportation, you can fold the headset:
왘Tuck the ear cups between the headband.
To unfold the headset:
왘Grasp both ear cups and pull them up and away from the
headband.
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Cleaning and maintaining the HME 110
HME 110 | 13
Cleaning and maintaining the
HME 110
Cleaning the headset
CAUTION!
Liquids can damage the electronics of the product!
Liquids entering the housing of the product can cause a
short-circuit and damage the electronics.
왘Keep all liquids far away from the product.
왘Do not use any solvents or cleansing agents.
왘Use a soft, dry cloth to clean the product from time to
time.
Replacing the wind screen
If the wind screen for the microphone shows signs of wear
such as tears or holes, replace the wind screen. The new wind
screen must totally enclose the microphone.
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Cleaning and maintaining the HME 110
14 | HME 110
Replacing the ear pads
If the ear pads are damaged or worn out, replace them as
follows:
왘Grasp the edge of the old ear pads and peel them up and
away from the ear cups.
왘Press the new ear pads onto the ear cups.
HME110_547018_0112_SP3.book Seite 14 Freitag, 13. Januar 2012 5:20 17

Accessories and spare parts
HME 110 | 15
Accessories and spare parts
The following accessories and spare parts are available from
your Sennheiser partner. To find a Sennheiser partner in your
country, search at www.sennheiser-aviation.com or
www.sennheiser.com.
• Wind screen for BKE 45-1 condenser microphone
•HZC08cableclip
• Carry and storage bag
• GOP gel ear pads
• LUXURY ear pads
HME110_547018_0112_SP3.book Seite 15 Freitag, 13. Januar 2012 5:20 17

If a problem occurs ...
16 | HME 110
If a problem occurs ...
Problem
Communication
s in one ear only
You are using a stereo
audio system but the
headset is set to mono
operation.
Set the mono/stereo
switch to “STEREO”
(see page 9).
You are receiving a
mono source but the
headset is set to stereo
operation.
Set the mono/stereo
switch to “MONO”
(see page 9).
Very low
volume
communication
The volume is set too
low.
Adjust the volume
setting of your
headset 
(see page 10).
The headphone
connection has been
pulled out.
Check to see if the
headphone jack plug
is correctly connected.
Reduced
intelligibility
The microphone
connection has been
pulled out.
Check to see if the
microphone jack plug
is correctly connected.
Microphone
output voltage
too high or too
low
The microphone gain
“Mic Gain” needs to be
readjusted.
Adjust the
microphone gain 
“Mic Gain” until you
have reached the
desired setting 
(see page 11).
Possible cause Solution
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Communication
s in one ear only

If a problem occurs ...
HME 110 | 17
If a problem occurs that is not listed in the above table or if
the problem cannot be solved with the proposed solutions,
please contact your local Sennheiser partner for assistance.
To find a Sennheiser partner in your country, search at
www.sennheiser-aviation.com or www.sennheiser.com.
HME110_547018_0112_SP3.book Seite 17 Freitag, 13. Januar 2012 5:20 17

Specifications
18 | HME 110
Specifications
Headset
Transducer principle dynamic, closed
Ear coupling circum-aural
Frequency response 45 – 15,000 Hz
Nominal impedance mono: 150 
stereo: 300 
Noise attenuation > 10 to 40 dB
Contact pressure approx. 10 N
Microphone incl. preamplifier
Transducer principle BKE 45-1 condenser mic capsule, 
noise-compensating
Frequency response 300 – 5,000 Hz
Max. SPL 120 dB
Terminating
impedance
150 
Output voltage 400 mV ± 3dB at 114 dB
(as per RTCA/DO 214)
Supply voltage typ. 16 VDC (8 to 16 VDC 
approx. 8 to 25 mA as per RTCA/DO 214)
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Specifications
HME 110 | 19
General data
Connection cable approx. 1,5 m,
unilateral
Weight without cable approx. 350 g
Connectors ¼” (6.35 mm) jack plug for headphones,
5.25 mm jack plug (PJ-068 equivalent)
for microphone
Controls mono/stereo switch
headphone volume control
Temperature range operation: 15°C to 55°C
storage: 55°C to 55°C
Connector assignment
5.25 mm jack plug (PJ-068 equivalent)
12 3
1Not assigned
2Microphone High
3Microphone Low
¼” (6.35 mm) jack plug
12 3
1Audio High left
2Audio High right
3Audio Low
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