Sennheiser HMEC 45-CA - Manual

HMEC 45 NoiseGard™

Headsets |

Pilot´s Headset with NoiseGard™

Active Noise Compensation

General Description

The HMEC 45 is a very lightweight and comfor table open pilot’s head-
set (boomset) with NoiseGard™ active noise compensation. Dif ferent
connector and powering versions are available to suit every conceivable
cockpit configuration.

Features

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Noise reduction of approx. 10 dB – consequently ATC signal can

be decreased

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Lightweight, with soft ear pads

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Two-piece adjustable headband ensures a secure fit

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Boom microphone with noise-compensated electret capsule

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Adjustable microphone boom can be turned through 350° and

thus be worn on either side

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FAA and JAA TSO approval C 57 a and C 58 a

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Delivery includes: 1 HMEC 45 headset, 1 MZW 45 windshield

1 MZQ 2002-1 cable clip

Recommended Accessories

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HZH 60 hygiene pads (100 pairs)

Cat. No. 003553

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HZP 45 comfort hygiene pads

Cat. No. 091592

Replacement Parts

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Ear pads(1 pair)

Cat. No. 046581

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MZW 45 windshield

Cat. No. 075823

Technical Data

Headphones

Transducer principle ..............................................................dynamic
Ear coupling ........................................................... supra-aural, open
Frequency response ................................................. 20 – 18,000 Hz
Impedance active/passive ............... 600

Ω

/160

Ω

(2 x 1,200

Ω

/

2 x 320

Ω

connected in parallel)

Nominal SPL ......................................................... 102 dB/SPL ± 3 dB
(1 kHz, 1 mW) ...............................................(as per RTCA/DO 214)
Active noise compensation.........................10 dB ± 3 dB between

400 Hz and 1 kHz

NRR (Noise Reduction Rating) ................................................ 11 dB
THD ................................................................................................< 1 %
Contact pressure ...........................................................approx. 1.6 N
Weight without cable ............................................................... 140 g

Microphone incl. Preamplifier

Type ....................................................................................... MKE 45-1
Transducer principle ..................back-electret condenser capsule,

noise-compensated

Frequency response ................................................. 300 – 5,000 Hz
Max. SPL ................................................................................... 120 dB
Output voltage ........................................ 400 mV ± 3 dB at 114 dB

(as per RTCA/DO 214)

Terminating impedance .......................................................... 150

Ω

Operating voltage....................................... 8 – 16 V DC, 8 – 25 mA

(as per RTCA/DO 214)

General Data

Connection cable............. single-sided round cable, length 1.8 m
NoiseGard™ supply
-CA/-KA...................................................... 2 x 1.5 V AA batteries or

2 x 1.2 V AA rechargeable batteries

-KAX ................................................ 12 – 35 V DC from the aircraft,

via XLR-3 connector

Operating time approx.
-CA/-KA........................................................................ Batteries: 80 h

Rechargeable batt.: 20 h

Switch -CA/-KA ................................... Battery/NoiseGard™ on/off
Indicator -CA/-KA ...................................... green LED for Power On
Connector(s)
-CA ............................................................................................... XLR-5
-KA
Headphones ..................................... 1/4” stereo jack (6.3 mm Ø)

(converted to mono)

Microphone ..................................................... PJ-068 (5.25 mm Ø)
-KAX
Headphones ..................................... 1/4” stereo jack (6.3 mm Ø)

(converted to mono)

Microphone ..................................................... PJ-068 (5.25 mm Ø)
NoiseGard™ supply .................................................................. XLR-3

Cat. No. 004498

HMEC 45

Cat. No. 004497

HMEC 45-CA

Cat. No. 004498

HMEC 45-KA

Cat. No. 004649 HMEC 45-KAX