Sennheiser HMEC 250 User manual

Bedienungsanleitung

Instruction Manual

Notice d‘emploi

Istruzioni per l‘uso

Instrucciones de uso

Gebruiksaanwijzing

HMEC 250

HMEC250_516578_0507_SP6.book Seite 1 Mittwoch, 13. Juni 2007 3:18 15

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

HMEC250_516578_0507_SP6.book Seite 1 Mittwoch, 13. Juni 2007 3:18 15

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.

HMEC250_516578_0507_SP6.book Seite 2 Mittwoch, 13. Juni 2007 3:18 15

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.

HMEC250_516578_0507_SP6.book Seite 3 Mittwoch, 13. Juni 2007 3:18 15

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

HMEC250_516578_0507_SP6.book Seite 4 Mittwoch, 13. Juni 2007 3:18 15

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.

HMEC250_516578_0507_SP6.book Seite 5 Mittwoch, 13. Juni 2007 3:18 15

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

HMEC250_516578_0507_SP6.book Seite 6 Mittwoch, 13. Juni 2007 3:18 15

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







HMEC250_516578_0507_SP6.book Seite 7 Mittwoch, 13. Juni 2007 3:18 15

LED indications

Meanings of the LED :



LED Meaning

red NoiseGard 2.0 operation

green TalkThrough operation

flashing Batteries are almost flat

HMEC250_516578_0507_SP6.book Seite 8 Mittwoch, 13. Juni 2007 3:18 15

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

HMEC250_516578_0507_SP6.book Seite 9 Mittwoch, 13. Juni 2007 3:18 15

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