cockpit headsets, pilot, aeroplane, aircraft
General Description
Experience excellent noise attenuation over the entire frequency range. The HMEC 350 NoiseGard� ensures superior speech intelligibility and voice transmission - even in the loudest of surroundings. This lightweight headset is fitted with a volume control for the headphones, flexible boom microphone, collapsible cushioned headband, mono/stereo switch and the on/off switch for NoiseGard� circuitry, with ease of use and optimum comfort in mind.
Features
- Constant attenuation of up to 40 dB throughout the entire audio range
- Superior speech intelligibility
- Electronics fully integrated into headphone capsules
- Can be used as conventional headphones when supply voltage is switched off
- Noise-compensated boom microphone for superior speech transmission
- 5 year warranty
Delivery Includes
- HMEC 350 NoiseGard™
- 3-pin input socket for aircraft’s internal power supply
- Carrying case for headset and accessories
- MZQ 2002-1 cable clip
- MZW 45 windshield
- BP04 battery pack and installation socket
cockpit headsets, pilot, aeroplane, aircraft
Technical Data
| Attenuation (active + passive) |
> 25 - 40 dB |
| Connection cable |
Approx 5 ft. (1.5 m) |
| Connector |
6.3 mm stereo-headphones, PJ-068-microphone, XLR-3 NoiseGard™ power, volume control for headphones |
| Contact pressure |
Approx. 10 N |
| Ear coupling |
Around-the-ear |
| Frequency response (headphones) |
45 - 15,000 Hz |
| Frequency response (microphone) |
300 - 5,000 Hz |
| Max. sound pressure level (active) |
120 dB |
| NoiseGard™ supply |
12 - 35 VDC approx. 27 mA, max. 80 mA |
| Operating temperature |
-10 °C...+55 °C |
| Operating voltage (stand alone) |
typ. 16 VDC (8-16 VDC, 8-25 mA) |
| Output voltage |
400 mV ± 3 dB / 114 dB/SPL |
| Specials |
NoiseGard™ on/off & mono/stereo switch |
| Storage temperature |
-55 °C...+55 °C |
| Transducer principle |
Dynamic |
| Transducer principle |
Electret - MKE 45-1 bipolar |
| Weight w/o cable |
13.1 oz. (370 g) |
Connector Image
cockpit headsets, pilot, aeroplane, aircraft
Recommended Accessories
| Part/Accessory |
Article No. |
| BP 04 |
500357 |
Battery pack for HMEC( ) noiseguard headsets
|
cockpit headsets, pilot, aeroplane, aircraft
Variants
Glossary
| Attenuation (active + passive) |
| Reduction in ambient noise achieved by wearing (closed) headphones (passive attenuation) with NoiseGard active noise compensation (active attenuation). |
| Connection cable |
| When one speaks about headphones, the emphasis is on such things as sound quality and frequency response. There is rarely any mention of the connection cable. Most Sennheiser headphones are fitted with an OFC (oxygen-free copper) cable. This ensures linear and low-loss transmission in the broad frequency spectrum of the headphones. Many Sennheiser headphones also have detachable cables, which make it very easy to replace them. |
| Connector |
| A standardised single or multi-pole plug for connecting units or accessories. |
| Contact pressure |
| The wearing comfort of a set of headphones is determined not only by its weight but also by the force with which the earpieces are pressed onto the ears. This force is given in newtons (N), whereby 1 N corresponds to the compressive force which a mass of about 100 g exerts on a solid surface. The DIN Standard 45500 Part 10 limits the maximum permissible contact force to 5 N. Values of between 1.3 and 4 N are common, although lower values apply for open headphones. Higher values can be found in the case of closed headphones. Here, a higher contact pressure is required in order to achieve sufficient sealing, which is important for the reproduction of low frequencies. |
| Ear coupling |
| A distinction is made between headphones which are worn on the external ear (supra-aural) and those which surround the ear (circumaural). Open headphones have foam ear pads that rest on the ears or ring pads that surround the ears. Closed headphones, on the other hand, nearly always have circumaural ear pads. |
| Frequency response (headphones) |
| The frequency response of a pair of headphones is given within limits defined by the manufacturer. |
| Frequency response (microphone) |
| The frequency response of a microphone is given within the limits defined by the manufacturer. In studio condenser microphones it is generally within the range of between 20 Hz and 20 kHz. |
| Operating temperature |
| Gives the range of temperatures at which a unit can be operated without damage. |
| Operating voltage (stand alone) |
| Voltage type and level required for powering a unit. |
| Output voltage |
| The (signal) voltage which a unit supplies at its output. |
| Storage temperature |
| Gives the range of temperatures at which a unit can be stored without damage. |
| Transducer principle |
| Two transducer principles have become established for the conversion of electric energy into mechanical energy: electrodynamic and electrostatic transducers, whereby the latter is only to be found in audiophile systems, due to their relatively high manufacturing costs. Electrodynamic transducers basically consist of a ring-shaped permanent magnet and an oscillation coil, which is fixed to the receiver diaphragm. When an audio-frequency alternating current is passed through the oscillation coil, it is caused to vibrate in accordance with the audio-frequency alternating current, thus causing the diaphragm to vibrate in the same way. |
| Transducer principle |
| Two transducer principles have become established for the conversion of electric energy into mechanical energy: electrodynamic and electrostatic transducers, whereby the latter is only to be found in audiophile systems, due to their relatively high manufacturing costs. Electrodynamic transducers basically consist of a ring-shaped permanent magnet and an oscillation coil, which is fixed to the receiver diaphragm. When an audio-frequency alternating current is passed through the oscillation coil, it is caused to vibrate in accordance with the audio-frequency alternating current, thus causing the diaphragm to vibrate in the same way. |
