Sennheiser HMEC 45, HMEC 45-KAX, HMEC 45-KA, HMEC 45-CA User Manual
HMEC 45 NoiseGard™
Headsets | Pilot´s Headset with NoiseGard™
Active Noise Compensation
General Description
The HMEC 45 is a very lightweight and comfortable open pilot’s headset (boomset) with NoiseGard™ active noise compensation. Different
connector and powering versions are available to suit every conceivable
cockpit configuration.
Cat. No. 004498 HMEC 45
Cat. No. 004497 HMEC 45-CA
Cat. No. 004498 HMEC 45-KA
Cat. No. 004649 HMEC 45-KAX
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
Features
j
Noise reduction of approx. 10 dB – consequently ATC signal can
be decreased
j
Lightweight, with soft ear pads
j
Two-piece adjustable headband ensures a secure fit
j
Boom microphone with noise-compensated electret capsule
j
Adjustable microphone boom can be turned through 350° and
thus be worn on either side
j
FAA and JAA TSO approval C 57 a and C 58 a
j
Delivery includes: 1 HMEC 45 headset, 1 MZW 45 windshield
1 MZQ 2002-1 cable clip
Recommended Accessories
j
HZH 60 hygiene pads (100 pairs) Cat. No. 003553
j
HZP 45 comfort hygiene pads Cat. No. 091592
Replacement Parts
j
Ear pads(1 pair) Cat. No. 046581
j
MZW 45 windshield Cat. No. 075823
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
Loading...