Sennheiser HMEC 250 - 05-10 User manual

HMEC 250

Headset for

general aviation

Instruction manual

Contents

Important safety instructions ...................................................2

Delivery includes ..........................................................................4

The HMEC 250 headset ...............................................................5

Operating elements .....................................................................7

Putting the headset into operation .........................................8

Inserting the batteries .......................................................... 8

Connecting the headset ........................................................ 8

Connecting a mobile telephone .......................................... 9

Connecting an additional audio player ........................... 10

Adjusting the microphone sensitivity ............................ 11

Switching between mono and stereo mode .................. 11

Using the headset .................................................................... 12

Attaching the cable clip ..................................................... 12

Adjusting the headset ....................................................... 12

Adjusting the microphone boom ..................................... 13

Adjusting the volume ........................................................ 13

Switching the TalkThrough function on/off .................. 14

Adjusting the volume of the TalkThrough function .... 14

Switching NoiseGard on/off ............................................. 15

Replacing the batteries ..................................................... 16

Folding up the headset ............................................................ 17

Care and maintenance ............................................................. 18

Replacing the ear pads ...................................................... 18

Replacing the wind shield ................................................. 19

Specifications ............................................................................ 20

Manufacturer declarations ..................................................... 22

Important safety instructions

• Please read this instruction manual carefully and

completely before using the headset.

• Make these this instruction manual easily accessible to all

users at all times.

Always include this instruction manual when passing the

headset on to third parties.

• During flight operation, do not use the headset for

telephone calls.

• With 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 critical sounds,

especially warning alarms and sounds resulting from

malfunction.

• The 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.

• Never repair or attempt to repair a defective headset

yourself. Contact your Sennheiser partner or the

Sennheiser Service Department.

• Only replace those parts of the headset whose

replacement is described in this instruction manual. All

other parts of the headset must be replaced by your

Sennheiser partner.

• Protect the headset from wetness. Use only a slightly

damp cloth to clean the headset. For information on how

to clean the headset, contact your Sennheiser partner.

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 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.

Always 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.

Intended use of the headset

Intended use includes:

• having read this instruction manual, especially the

chapter “Important safety instructions” on page 2,

• using the headset within the operating conditions and

limitations described in this instruction manual.

“Improper use” means using the headset other than as

described in this instruction manual, or under operating

conditions which differ from those described herein.

Delivery includes

Delivery of the HMEC 250 headset includes:

1 HMEC 250 headset

1softcase

1 HZC 08 cable clip

2 Wind and pop shields for MZW 46

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

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 2.0TM

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, NoiseGard

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.

TalkThrough function (TT)

The TalkThrough function allows you to communicate with

the people around you while wearing the headset. The

NoiseGard active noise compensation and the peak level

protection remain unaffected by the TalkThrough function

and help to protect your hearing.

Additional features

• Outstanding transmission quality for clear communi-

cations

• Good passive attenuation of ambient noise

• Foldable design for space-saving storage and transpor-

tation

• Noise-compensating boom microphone ensures excellent

speech transmission

• Flexible microphone boom

• Separate left and right channel volume control

•Excellentcomfortresultingfrom soft ear pads and head-

band padding

• Audio-input facility for external audio sources, such as

mobile phones, MP3 players

Operating elements

Headset

Microphone sensitivity control

Headset cable

Microphone boom

Ear pads, ergonomic

Headband

Battery compartment (on both sides)

Operating control integrated

in the headset

TT VOLUME + button (Talk Through)

ON/OFF button (NoiseGard)

TT VOLUME – button (Talk Through)

TALK THROUGH button (on/off)

LED (status display)

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 (3-pin)

2.5 mm jack socket for connecting a

mobile telephone (3-pin)

Mono/stereo switch

Separate left and right channel

slide volume controls







쐋

















햴







LED indications

Meanings of the LED :

Putting the headset into operation

Inserting the batteries

Insert the batteries into the battery compartments on the

left and right ear cups as follows:

왘Open the battery compartment by pushing the catch

and open the cover.

왘Insert the AAA size battery as shown.

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.



LED Meaning

red NoiseGard is switched on

green TalkThrough is switched on

flashing Batteries are almost flat





Connector for connection to the

¼” (6.35 mm) jack plug headphone output

5.25 mm jack plug microphone input

Connecting a mobile telephone

The 2.5 mm jack socket allows you to connect a mobile

telephone. For this purpose, the NoiseGard active noise

compensation must be switched on and the microphone

connector must be connected to the aircraft intercom.

Asuitable adapter for your mobile telephone with 2.5 mm

jack socket is available from your specialist dealer.

왘Connect the audio cable to the 2.5 mm jack socket (3-pin)

on the operating control and to the corresponding jack

socket on your mobile telephone (4-pin).

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 on (see “Switching NoiseGard on/off”

on page 15).

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!

For the latest list of compatible mobile telephones,

please refer to the „Professional Audio“ >

„Aviation Headsets“ section on our website at

www.sennheiser.com.



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