Sennheiser HMEC 250 User manual

Bedienungsanleitung
Instruction Manual
Notice d‘emploi
Istruzioni per l‘uso
Instrucciones de uso
Gebruiksaanwijzing
HMEC 250
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1
Contents
Important safety instructions ...................................................2
Delivery includes ..........................................................................4
The HMEC 250 headset ...............................................................5
Operating elements .....................................................................7
LED indications ........................................................................8
Preparing the headset for use ..................................................9
Inserting the batteries .......................................................... 9
Connecting the headset ........................................................ 9
Connecting a mobile telephone ....................................... 10
Connecting an additional audio player ........................... 11
Adjusting the microphone sensitivity ............................ 12
Switching between mono and stereo mode .................. 12
Using the headset .................................................................... 13
Attaching the cable clip ..................................................... 13
Adjusting the headset ....................................................... 13
Adjusting the volume ........................................................ 14
Switching the TalkThrough function on/off .................. 15
Adjusting the volume of the TalkThrough function .... 15
Switching NoiseGard on/off ............................................. 16
Replacing the batteries ..................................................... 17
Folding up the headset ............................................................ 18
Care and maintenance ............................................................. 19
Replacing the earpads ....................................................... 19
Replacing the wind shield ................................................. 20
Accessories and spare parts ................................................... 20
Specifications ............................................................................ 21
Manufacturer declarations ..................................................... 23
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Important safety instructions
yPlease read these instructions carefully and completely
before using the headset.
yMake these instructions easily accessible to all users at all
times. Always include these instructions when passing
the headset on to third parties.
yDuring flight operation, do not use the headset for
telephone calls.
yWith the NoiseGard active noise compensation switched
on, typical aircraft sounds (for example, those from
engines, propellers, warning alarms, etc.) may sound
different to you. Before operating any aircraft, make sure
that, with NoiseGard switched on, 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.
yThe headset is capable of producing sound pressure levels
exceeding 85 dB(A). In many countries 85 dB(A) is the
maximum legally permissible level for continuous noise
exposure during the working day. Exposure to sounds of
higher volume levels or for longer durations can
permanently damage your hearing!
yNever repair or attempt to repair a defective headset
yourself. Contact your Sennheiser agent or the
Sennheiser Service Department.
yOnly replace those parts of the headset whose
replacement is described in this manual. All other parts of
the headset must be replaced by your Sennheiser agent.
yProtect the headset from humidity. Use only a slightly
damp cloth to clean the headset. For information on how
to clean the headset, contact your Sennheiser agent.
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3
Safety instructions for batteries
If abused or misused, batteries may leak and, in extreme
cases, may even present an explosion and fire hazard.
Sennheiser does not accept any liability for damage arising
from abuse or misuse.
Keep batteries out of
reach and out of
sight of children.
Observe correct
polarity.
Do not heat or throw
into fire.
Switch off battery
powered devices when
not in use.
Remove batteries
when the device is
not used for
extended periods of
time.
Dispose of exhausted
batteries at special
collection points or
return them to your
specialist dealer.
Do not solder. Do not short-circuit.
Do not mutilate or
dismantle.
Do not attempt
to recharge
non-rechargeable
batteries.
Do not pack charged
batteries loose –
danger of shorting
out – fire hazard.
IAlways remove flat or
exhausted batteries
from the device
immediately.
Do not mix old or
used batteries with
new ones. Do not mix
batteries of different
types or brands.
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Intended use of the headset
Intended use includes:
yhaving read these instructions, especially the chapter
“Important safety instructions” on page 2,
yusing the headset within the operating conditions and
limitations described in this instruction manual.
Improper use means using the headset other than as
described in these instructions, or under operating
conditions which differ from those described herein.
Delivery includes
Delivery of the HMEC 250 headset includes:
1 HMEC 250 headset
1 soft case
1 cable clip
2 MZW 46 wind and pop shields
1 audio-in cable for mobile telephones, length 0.6 m,
with two 2.5 mm jack plugs
1 audio-in cable for additional audio players, length 0.6 m,
with two 3.5 mm jack plugs
2 AAA size batteries
1 instruction manual
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The HMEC 250 headset
The HMEC 250 headset with NoiseGard 2.0 active noise
compensation features closed, dynamic, circumaural stereo
headphones. The HMEC 250 is a headset for general aviation
use.
NoiseGard 2.0
The NoiseGard 2.0 active noise compensation system is
based on the principle of cancelling out sound using “anti-
sound” (phase-inverted sound). Tiny microphones pick up
low-frequency ambient noise (up to 1 kHz) near the ear. The
NoiseGard 2.0 electronics use this noise to generate a sound
wave which is the exact opposite (i.e.: at the same level but
polarity reversed – 180° out-of-phase), the result is that the
polarity reversed signal cancels most of the outside noise.
Fail safe operation
When the batteries are completely discharged, the
NoiseGard 2.0 active noise compensation automatically
switches off. RT traffic (e.g. ATC) and intercom will still be
heard through the headphones.
Peak level protection
The peak level protection safeguards your ears from volume
peaks above 110 dB.
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TalkThrough function
The TalkThrough function allows you to communicate with
the people around you while wearing the headset. The
NoiseGard 2.0 active noise compensation and the peak level
protection remain unaffected by the TalkThrough function
and help to protect your hearing.
Additional features
yOutstanding transmission quality for clear
communications
yGood passive attenuation of ambient noise
yFoldable design for space-saving storage and
transportation
yNoise-compensating boom microphone ensures excellent
speech transmission
yFlexible microphone boom
ySeparate left and right channel volume control
yExcellent comfort resulting from soft ear pads and
headband padding
yAudio-input facility for external audio sources, such as
mobile phones, MP3 players
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Operating elements
Headset
Microphone sensitivity control
Headphone cable
Microphone boom
Earpads
Headband
Battery compartment (on both sides)
Operating control integrated in the headset
TT VOLUME + button
ON/OFF button (NoiseGard 2.0)
TT VOLUME – button
TalkThrough button
LED
Operating control integrated in the cable
Cable with microphone plug,
5.25 mm jack plug
Cable with headphone plug,
¼” (6.35 mm) jack plug
3.5 mm jack socket for connecting an
additional audio player
2.5 mm jack socket for connecting a
mobile telephone
Mono/stereo switch
Separate left and right channel slide
volume controls



쐋








햴



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LED indications
Meanings of the LED :

LED Meaning
red NoiseGard 2.0 operation
green TalkThrough operation
flashing Batteries are almost flat
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Preparing the headset for use
Inserting the batteries
Insert the batteries into the battery compartments on the
left and right earcups as follows:
왘Open the battery compartment by pushing the catch
and open the cover.
왘Insert the AAA size battery as shown in the diagram on
the left. Please observe correct polarity when inserting
the battery.
왘Close the battery compartment . The battery compart-
ment cover locks into place with an audible click.
Connecting the headset
The headset’s operating control features two cables with
one jack plug each.
왘Connect the headset to the corresponding sockets of your
intercom.


Connector for connection to the
¼” (6.35 mm) jack plug headphone output
5.25 mm jack plug microphone input
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Connecting a mobile telephone
The 2.5 mm jack socket allows you to connect a mobile
telephone. For this purpose, the microphone plug must be
connected to the aircraft radio/intercom. A suitable adapter
for your mobile telephone with 2.5 mm jack socket is
available from your Sennheiser agent.
Note:
For the latest list of compatible mobile telephones, please
refer to the “Cell Phone Compatibility” section on our
website at www.sennheiser.com. Search under
“Products”, “Aviation” and “more info …”.
왘Connect the audio cable to the 2.5 mm jack socket on
the operating control and to the corresponding jack
socket on your mobile telephone.
You can adjust the volume of the mobile telephone via
the headset’s operating control. However, the functions
of the mobile telephone cannot be controlled via the
headset’s operating control.
왘Switch NoiseGard 2.0 on (see “Switching NoiseGard on/
off” on page 16).
Audio from the mobile telephone and from the intercom
are heard simultaneously through the headset.
왘Operate your mobile telephone as usual and observe the
manufacturers instructions.
DANGER! Danger of accident due to reduced
attention!
Making telephone calls or operating the
mobile telephone limits your attention and
may cause accidents.
왘During flight operation, do not use the
headset for telephone calls!

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Connecting an additional audio player
The 3.5 mm jack socket allows you to connect and listen
to an additional audio player (e.g. MP3 player) through the
headset.
왘Connect the audio cable to the 3.5 mm jack socket on
the operating control and to the corresponding jack
socket on your audio player.
왘Switch NoiseGard 2.0 on (see “Switching NoiseGard on/
off” on page 16).
Audio from the additional audio source and from the
intercom are heard simultaneously through the headset.
왘Operate the connected audio player as usual and observe
the manufacturers instructions.
DANGER! Danger of accident due to reduced
attention!
Listening to music or operating an audio
device limits your attention and may cause
accidents.
왘During flight operation, do not use the
headset for listening to additional audio
sources!
Hearing damage due to high volumes!
This headset is capable of producing high
sound pressure levels. Higher volumes or
longer durations can damage your hearing!
왘Set the volume to a medium level. Make
sure that you can hear critical sounds
such as warning alarms.

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Adjusting the microphone sensitivity
The microphone sensitivity has been factory pre-set to
40 mV/Pa as per RTCA DO-214.
To change the input sensitivity of the microphone:
왘Use a suitable slotted screwdriver.
왘Turn the microphone sensitivity control as shown.
Switching between mono and stereo mode
The mono/stereo switch  allows you to switch between
mono and stereo mode, depending on the intercom system.
왘Set the mono/stereo switch  to the desired position:
–mono
– stereo


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Using the headset
Attaching the cable clip
The cable clip allows you to attach the headphone
cable to your clothing so that the cable doesn’t hinder or
distract you.
왘Guide the headphone cable through the cable clip .
왘Attach the cable clip to your clothing.
Adjusting the headset
왘Wear the headset so that
– the microphone boom is on the left side of the
mouth (see right/left labeling on the headband joints),
– the headband runs over the top of your head.
왘Adjust the length of the headband so that
– your ears are completely inside the earpads ,
– you feel even, gentle pressure around your ears,
– a snug fit is ensured.
In this way, optimum transmission quality, good noise
attenuation and best possible comfort is ensured.
왘Final adjustment is best made in a noisy environment.

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왘Bend the microphone boom so that the microphone is
placed at the corner of the mouth. Maintain a distance of
approx. 2 cm between microphone and mouth.
Adjusting the volume
You can adjust the volume directly on the intercom or via
the operating control integrated into the cable.
To adjust the volume for the left or right channel:
왘Slide one of the two volume controls 
– upwards to increase the volume or
– downwards to reduce the volume.
CAUTION! Hearing damage due to high volume
levels!
The headset is capable of producing high
sound pressure levels. Higher volumes or
longer durations can damage your hearing!
왘Adjust the volume to a medium level.
Make sure that you can hear critical
sounds such as warning alarms.

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Switching the TalkThrough function on/off
The HMEC 250 provides excellent attenuation of ambient
noise. In order to allow you to communicate undisturbed
with your surroundings while wearing the headset, the
HMEC 250 features a TalkThrough function.
왘Press the TalkThrough button to switch the
TalkThrough function on or off.
When the TalkThrough function is switched on, the LED 
lights up green.
Adjusting the volume of the TalkThrough function
To increase the volume of the
TalkThrough function:
왘Press the TT VOLUME + button.
To reduce the volume of the
TalkThrough function :
왘Press the TT VOLUME – button.
Note:
If you change the volume with the TalkThrough function
switched on, the new volume setting is saved and will be
used as the default the next time the TalkThrough
function is activated.


햴
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Switching NoiseGard on/off
To switch the NoiseGard™ 2.0 active noise compensation on
or off:
왘Press the ON/OFF button for approx. one second.
When NoiseGard 2.0 is switched on:
–theLED lights up red and
– you can listen to music and make telephone calls at the
same time.
Fail safe operation When the batteries are completely discharged, the
NoiseGard 2.0 active noise compensation automatically
switches off. RT traffic (e.g. ATC) and intercom will still be
heard through the headphones.


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Replacing the batteries
When the batteries are almost flat, the LED flashes. When
the batteries are completely discharged, the NoiseGard 2.0
active noise compensation automatically switches off (fail
safe operation). Replace the battery as follows:
Note:
Always replace the two batteries at the same time.
왘Open the battery compartment by pushing the catch
and open the cover.
왘Remove the battery.
왘Insert a new AAA size battery as shown in the diagram on
the left. Please observe correct polarity when inserting
the battery.
왘Close the battery compartment . The battery compart-
ment cover locks into place with an audible click.
Note:
Remove the batteries from the battery compartments 
if the headset will not be used for extended periods of
time.

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Folding up the headset
For space-saving transportation, the headset can be folded
up in different ways:
To fold up the headphones as flat as possible:
왘Rotate the earcups by 90° and turn the microphone boom
flat as shown.
To fold up the headphones as compact as possible:
왘Tuck the earcups between the headband as shown.
For safe transportation of the headset, use the supplied soft
case and fold the headset as follows:
왘Rotate the earcups by 90°.
왘Turn the microphone boom flat as shown.
왘Pull out the right earcup and then fold it in.
왘Place the headset flat into the soft case as shown.
The two AAA size batteries can be inserted into the two
straps at the side of the soft case.
The accessories can be transported in the cover of the soft
case:
– Audio cable (3.5 mm)
– Audio cable (2.5 mm)
– MZW 46 wind and pop shields


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Care and maintenance
왘Use a soft, slightly damp cloth to clean the headset from
time to time.
Replacing the earpads
You can replace the earpads. Spare earpads are available as
accessories (see “Accessories and spare parts” on page 20).
왘Grasp the edge of the earpad behind the earcup and
peel it up and away from the earcup.
왘Press the new earpad onto the earcup until it clicks
audibly into place. Repeat for the other earcup.
CAUTION! Liquids can damage the electronics of the
headset!
Liquids entering the housing of the
headset can cause a short-circuit and
damage the electronics.
왘Only use a soft, slightly damp cloth to
clean the headset. Do not use any
solvents or cleansing agents.
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