Instructions for Use
Page 2
... ...13 Preparing the headsets for use ...19 Adjusting the headband ...19 Positioning the microphone ...20 Using the headsets ...22 Turning NoiseGard™ on/off ...22 Mono/Stereo selection (except HMEC 355, HMEC 355-C, HMEC 372 and HMDC 372 22 Adjusting the volume ...22 Attaching the cable clip ...23 Folding up the headphones ...23 Spare...
... ...13 Preparing the headsets for use ...19 Adjusting the headband ...19 Positioning the microphone ...20 Using the headsets ...22 Turning NoiseGard™ on/off ...22 Mono/Stereo selection (except HMEC 355, HMEC 355-C, HMEC 372 and HMDC 372 22 Adjusting the volume ...22 Attaching the cable clip ...23 Folding up the headphones ...23 Spare...
Instructions for Use
Page 3
... that , with NoiseGard™ turned on, you . The HMEC 350, HMEC 352, HMEC 355, HMEC 355-C, HMEC 356, HMEC 372, HMEC 450 and HMDC 372 are pilot headsets with closed ear protector headphones and NoiseGard™ active noise... compensation for example, those from engines, propellers, warning alarms, etc.) may sound different to you can hear and recognize these sounds. If problems occur, contact your Sennheiser...
... that , with NoiseGard™ turned on, you . The HMEC 350, HMEC 352, HMEC 355, HMEC 355-C, HMEC 356, HMEC 372, HMEC 450 and HMDC 372 are pilot headsets with closed ear protector headphones and NoiseGard™ active noise... compensation for example, those from engines, propellers, warning alarms, etc.) may sound different to you can hear and recognize these sounds. If problems occur, contact your Sennheiser...
Instructions for Use
Page 4
Headset features HMEC 350 NoiseGard™ headset • New active headset with effective attenuation of external noise across the entire frequency spectrum due to NoiseGard™ active noise compensation • NoiseGard™ active noise compensation provides clear communications even in the noisiest environment • Improved acoustic properties: The frequency response of the headphones has been optimised...
Headset features HMEC 350 NoiseGard™ headset • New active headset with effective attenuation of external noise across the entire frequency spectrum due to NoiseGard™ active noise compensation • NoiseGard™ active noise compensation provides clear communications even in the noisiest environment • Improved acoustic properties: The frequency response of the headphones has been optimised...
Instructions for Use
Page 5
... • Made in Germany, 5-year warranty (HMEC 450: 10-year warranty) Product variants HMEC 352 NoiseGard™ headset The HMEC 352 differs from the HMEC 350 in the following features: • Connection of microphone and NoiseGard™ electronics via PJ-068 plug HMEC 355 NoiseGard™ headset The HMEC 355 differs from the HMEC 350 in the following features: • No Mono...
... • Made in Germany, 5-year warranty (HMEC 450: 10-year warranty) Product variants HMEC 352 NoiseGard™ headset The HMEC 352 differs from the HMEC 350 in the following features: • Connection of microphone and NoiseGard™ electronics via PJ-068 plug HMEC 355 NoiseGard™ headset The HMEC 355 differs from the HMEC 350 in the following features: • No Mono...
Instructions for Use
Page 6
.../Stereo switch • Connection of headphones and microphone via XLR-5 plug • Connection of NoiseGard™ electronics via XLR-3 plug HMEC 356 NoiseGard™ headset The HMEC 356 differs from the HMEC 350 in the following features: • Connection of headphones, microphone and NoiseGard™ electronics to the on-board power supply system (12-35 V DC) via...
.../Stereo switch • Connection of headphones and microphone via XLR-5 plug • Connection of NoiseGard™ electronics via XLR-3 plug HMEC 356 NoiseGard™ headset The HMEC 356 differs from the HMEC 350 in the following features: • Connection of headphones, microphone and NoiseGard™ electronics to the on-board power supply system (12-35 V DC) via...
Instructions for Use
Page 7
HMEC 450 NoiseGard™ headset The HMEC 450 differs from the HMEC 350 in the following features: • Stylish silver design • Leatherette ear cushions • Headband padding can be buttoned HMDC 372 NoiseGard™ headset The HMDC 372 differs from the HMEC 350 in the following features: • No Mono/Stereo switch • Coiled cable • M-87/AIC dynamic microphone and low impedance headphones • Connection of headphones and microphone via U-174/U jack plug to a low impedance interface in the helicopter 7
HMEC 450 NoiseGard™ headset The HMEC 450 differs from the HMEC 350 in the following features: • Stylish silver design • Leatherette ear cushions • Headband padding can be buttoned HMDC 372 NoiseGard™ headset The HMDC 372 differs from the HMEC 350 in the following features: • No Mono/Stereo switch • Coiled cable • M-87/AIC dynamic microphone and low impedance headphones • Connection of headphones and microphone via U-174/U jack plug to a low impedance interface in the helicopter 7
Instructions for Use
Page 9
Adapter cables (except for HMEC 352, HMEC 355 and HMEC 356) Sennheiser offers special adapter cables for connecting the NoiseGard™ electronics of the HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 headsets. No. 500357) (except for HMEC 352, HMEC 355 and HMEC 356) Battery pack with a right-angled jack plug featuring... two headsets via the cigarette lighter socket • ACX-22 adapter cable for powering the NoiseGard™ electronics of the HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 headsets to the onboard power supply via the cigarette lighter socket: •...
Adapter cables (except for HMEC 352, HMEC 355 and HMEC 356) Sennheiser offers special adapter cables for connecting the NoiseGard™ electronics of the HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 headsets. No. 500357) (except for HMEC 352, HMEC 355 and HMEC 356) Battery pack with a right-angled jack plug featuring... two headsets via the cigarette lighter socket • ACX-22 adapter cable for powering the NoiseGard™ electronics of the HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 headsets to the onboard power supply via the cigarette lighter socket: •...
Instructions for Use
Page 10
... for HMEC 350 and HMEC 450 Connecting cable for HMEC 352 Connecting cable for HMEC 355 Connecting the headsets Connecting cables for headsets HMEC 350 and HMEC 450 headsets: 1 ¼" (6.35 mm) stereo jack plug for connecting the headphones 1 PJ-068 jack plug for connecting the microphone 1 XLR-3 plug for connecting the power supply for the NoiseGard™ electronics HMEC...
... for HMEC 350 and HMEC 450 Connecting cable for HMEC 352 Connecting cable for HMEC 355 Connecting the headsets Connecting cables for headsets HMEC 350 and HMEC 450 headsets: 1 ¼" (6.35 mm) stereo jack plug for connecting the headphones 1 PJ-068 jack plug for connecting the microphone 1 XLR-3 plug for connecting the power supply for the NoiseGard™ electronics HMEC...
Instructions for Use
Page 11
Connecting cable for HMEC 355-C Connecting cable for HMEC 356 HMEC 355-C headset: 1 XLR-5 plug for connecting the headphones and the microphone 1 XLR-3 plug for connecting the power supply for the NoiseGard™ electronics HMEC 356 headset: 1 6-pin Redel plug for connecting the headphones, the microphone and the power supply for the NoiseGard™ electronics HMEC 372 and HMDC 372 headsets: 1 U-174/U jack plug for connecting the headphones and the microphone 1 XLR-3 plug for connecting the power supply for the NoiseGard™ electronics Connecting cable for HMEC 372 and HMDC 372 11
Connecting cable for HMEC 355-C Connecting cable for HMEC 356 HMEC 355-C headset: 1 XLR-5 plug for connecting the headphones and the microphone 1 XLR-3 plug for connecting the power supply for the NoiseGard™ electronics HMEC 356 headset: 1 6-pin Redel plug for connecting the headphones, the microphone and the power supply for the NoiseGard™ electronics HMEC 372 and HMDC 372 headsets: 1 U-174/U jack plug for connecting the headphones and the microphone 1 XLR-3 plug for connecting the power supply for the NoiseGard™ electronics Connecting cable for HMEC 372 and HMDC 372 11
Instructions for Use
Page 12
Connector assignment Redel connector (NoiseGard™) XLR-3 connector (NoiseGard™) XLR-5 connector 1 Power supply NoiseGard™ (DC+) 1 Power supply NoiseGard™ (DC+) HMEC 355 HMEC 355-C 2 Audio Lo / DC - 2 Ground 1 Audio Hi 1 Audio Hi 3 Audio Hi left 4 Audio Hi right 3 ... 3 Microphone Hi 4 Audio Lo HMEC 352 HMEC 350 1 Power supply NoiseGard™ (DC+) 1 Not assigned! 2 Microphone Hi 2 Microphone Hi 3 Microphone Lo / DC - 3 Microphone Lo * Note: Battery powering for the NoiseGard™ system of HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 only via ...
Connector assignment Redel connector (NoiseGard™) XLR-3 connector (NoiseGard™) XLR-5 connector 1 Power supply NoiseGard™ (DC+) 1 Power supply NoiseGard™ (DC+) HMEC 355 HMEC 355-C 2 Audio Lo / DC - 2 Ground 1 Audio Hi 1 Audio Hi 3 Audio Hi left 4 Audio Hi right 3 ... 3 Microphone Hi 4 Audio Lo HMEC 352 HMEC 350 1 Power supply NoiseGard™ (DC+) 1 Not assigned! 2 Microphone Hi 2 Microphone Hi 3 Microphone Lo / DC - 3 Microphone Lo * Note: Battery powering for the NoiseGard™ system of HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 only via ...
Instructions for Use
Page 13
... to the BP-04 battery pack (accessory, except for powering the NoiseGard™ active noise compensation: 1. Connection to the cigarette ligther socket (12-35 V DC) via adapter cable (accessory, except for HMEC 352, HMEC 355 and HMEC 356) The supply voltage for the NoiseGard™ system is protected by the in-line electronics in the...
... to the BP-04 battery pack (accessory, except for powering the NoiseGard™ active noise compensation: 1. Connection to the cigarette ligther socket (12-35 V DC) via adapter cable (accessory, except for HMEC 352, HMEC 355 and HMEC 356) The supply voltage for the NoiseGard™ system is protected by the in-line electronics in the...
Instructions for Use
Page 14
...ensure that the on -board power supply systems with an XLR-3 socket for NoiseGard™ Ground Do not connect ! Power supply for panel mounting in the aircraft. The HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 headsets are supplied with operating voltages between 12-35 V... DC. Connecting the headset to the on-board system The NoiseGard™ electronics can be mounted by a 1 A fuse....
...ensure that the on -board power supply systems with an XLR-3 socket for NoiseGard™ Ground Do not connect ! Power supply for panel mounting in the aircraft. The HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 headsets are supplied with operating voltages between 12-35 V... DC. Connecting the headset to the on-board system The NoiseGard™ electronics can be mounted by a 1 A fuse....
Instructions for Use
Page 16
However, to the battery pack (except HMEC 352, HMEC 355 and HMEC 356) The NoiseGard™ electronics of the HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 headsets can be powered via the BP-04 battery pack (see "Recommended accessories" on page 9). Red LED: The batteries are low. ...
However, to the battery pack (except HMEC 352, HMEC 355 and HMEC 356) The NoiseGard™ electronics of the HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 headsets can be powered via the BP-04 battery pack (see "Recommended accessories" on page 9). Red LED: The batteries are low. ...
Instructions for Use
Page 18
Connecting the headset via a cigarette lighter adapter cable (except HMEC 352, HMEC 355 and HMEC 356) Sennheiser offers special adapter cables with XLR-3 socket for connecting the NoiseGard™ electronics of the HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 headsets to the on-board power supply via the cigarette lighter socket: • ACX-1 adapter cable for powering...
Connecting the headset via a cigarette lighter adapter cable (except HMEC 352, HMEC 355 and HMEC 356) Sennheiser offers special adapter cables with XLR-3 socket for connecting the NoiseGard™ electronics of the HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 headsets to the on-board power supply via the cigarette lighter socket: • ACX-1 adapter cable for powering...
Instructions for Use
Page 19
...; active noise compensation by setting the ON/OFF switch to "ON" (see "Turning NoiseGard™ on/off" on page 22). ̈ Final adjustment is ensured. Preparing the headsets for use Adjusting the headband For good noise attenuation and best ...
...; active noise compensation by setting the ON/OFF switch to "ON" (see "Turning NoiseGard™ on/off" on page 22). ̈ Final adjustment is ensured. Preparing the headsets for use Adjusting the headband For good noise attenuation and best ...
Instructions for Use
Page 22
... critical sounds such as a conventional headset. Mono/Stereo selection (except HMEC 355, HMEC 355-C, HMEC 372 and HMDC 372) In general, you can remain set the Mono/Stereo switch to loud sounds can be used as warning alarms. 22 Turn on the NoiseGard™ active noise compensation by setting the ON/OFF switch to...
... critical sounds such as a conventional headset. Mono/Stereo selection (except HMEC 355, HMEC 355-C, HMEC 372 and HMDC 372) In general, you can remain set the Mono/Stereo switch to loud sounds can be used as warning alarms. 22 Turn on the NoiseGard™ active noise compensation by setting the ON/OFF switch to...
Instructions for Use
Page 26
... be turned down but low frequency wind and engine noise, the most prominent noise in particular. NoiseGard™ - Of even greater concern is even higher. Valuable information on NoiseGard™ The NoiseGard™ principle One of these problems, Sennheiser has developed an active noise compensation system - Research has shown that the radio volume can...
... be turned down but low frequency wind and engine noise, the most prominent noise in particular. NoiseGard™ - Of even greater concern is even higher. Valuable information on NoiseGard™ The NoiseGard™ principle One of these problems, Sennheiser has developed an active noise compensation system - Research has shown that the radio volume can...
Instructions for Use
Page 27
... effect being that has come through the earcup. The radio signal remains unaffected, as a halving in . NoiseGard™ active noise compensation is achieved by 50 %. 27 However, active noise compensation with NoiseGard™ combined with NoiseGard™: Passive hearing protectors effectively attenuate noise from the receiver and the undesired noise that the out...
... effect being that has come through the earcup. The radio signal remains unaffected, as a halving in . NoiseGard™ active noise compensation is achieved by 50 %. 27 However, active noise compensation with NoiseGard™ combined with NoiseGard™: Passive hearing protectors effectively attenuate noise from the receiver and the undesired noise that the out...
Instructions for Use
Page 28
...except HMEC 352, HMEC 355 and HMEC 356): The batteries are turned off. ̈ Check to see if the ON/OFF switch is set to "ON". The XLR-3 plug has been pulled out of difficulty If problems occur that are not listed in the below table, please contact your Sennheiser agent.... If aircraft powered: The aircraft fuse is lit, replace the batteries. 28 If the red LED is defective. ̈ Check the aircraft fuse. Problem Clear communication but no active noise compensation Possible cause and what to do The NoiseGard™ electronics are low...
...except HMEC 352, HMEC 355 and HMEC 356): The batteries are turned off. ̈ Check to see if the ON/OFF switch is set to "ON". The XLR-3 plug has been pulled out of difficulty If problems occur that are not listed in the below table, please contact your Sennheiser agent.... If aircraft powered: The aircraft fuse is lit, replace the batteries. 28 If the red LED is defective. ̈ Check the aircraft fuse. Problem Clear communication but no active noise compensation Possible cause and what to do The NoiseGard™ electronics are low...
Instructions for Use
Page 31
General data Connecting cable Weight without cable Power supply for NoiseGard™ Current consumption Fuse Connectors Controls Temperature range Operating time of battery pack (except HMEC 352 and HMEC 356) HMEC 350 Ȋ HMEC 352 Ȋ HMEC 356 Ȋ HMEC 450 1.5 m, unilateral 370 g 12-35 V DC 27 mA (zero signal current), max. 80 mA 500 mA thermo fuse 6.35...
General data Connecting cable Weight without cable Power supply for NoiseGard™ Current consumption Fuse Connectors Controls Temperature range Operating time of battery pack (except HMEC 352 and HMEC 356) HMEC 350 Ȋ HMEC 352 Ȋ HMEC 356 Ȋ HMEC 450 1.5 m, unilateral 370 g 12-35 V DC 27 mA (zero signal current), max. 80 mA 500 mA thermo fuse 6.35...