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I work at an authorized service center and I can tell if a manual is as it should be. This one is. It may be a scan, but a very good one at that. The interesting part for me was the curcuit diagram which was scanned at high quality, making it as good as the original. I will definitely be back as a customer. I need not say this, but I will: the price was the best. Thank you owner-manuals.com .
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really a very good manual even sometimes the quality is no so good as before still very readible and very very useful!
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FAST very good and clear a great unexpensive job!!! very recomended for all people who are preofessional or hobbists as me!!!!!!
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Thank you very much for this Service Manual, it helped us a lot to repair the M-4318!
...BUT: The parts list is missing and the free parts katalog on web isn't complete, so now we don't know the part numbers of the defect parts :(
We had to build them out of a working machine, and need the numbers to reorder the missing parts now.
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Very good manual with clear electrical diagrams. Thanks owner-manuals.
HDA 280
Audiometric headphones
Design approved by the PTB (German national institute for science and technology). The headphones comply with IEC 60645-1. Important! The HDA 280 is designed for use with an audiometer! After exchanging audiometric headphones, the audiometer has to be re-calibrated!
Specifications
Cat. No. Transducer principle Ear coupling Frequency response Characteristic SPL Max. L/R deviation Max. nominal continuous input power Nominal impedance Contact pressure Connection cable Weight (with cable) Connection code 9860 9861 1 unit 24 units/carton
dynamic, closed supra-aural < 20 Hz to > 20 kHz 117 dB (at 1 kHz, 1 mW) 125 Hz � 4 kHz < 1.5 dB 4 kHz � 12 kHz < 2 dB 500 mW (as per EN 60268-7) 37 � 5 N ± 0.5 N approx. 3 m, open-ended 330 g green copper red copper +L �L +R �R
Pure tone RETSPL
Pure tone reference equivalent threshold sound pressure level Frequency (Hz) 125 250 500 750 1000 1500 2000 3000 4000 6000 8000 10000 12500 dB (re 20 µPa) 38.5 25.0 13.0 9.0 7.5 9.5 8.0 6.5 9.5 19.0 18.0 18.5 30.5 Max. SPL on B&K 4152 < 10 min. dB (at 4 V) 143 ± 3 144 ± 3 144 ± 3 144 ± 3 145 ± 3 145 ± 3 138 ± 3 133 ± 3 137 ± 3 132 ± 5 122 ± 5 110 ± 5 122 ± 5
measured at normal climate: temperature = 20 °C, relative humidity = 50 %, atmospheric pressure approx. 100 kPa
Frequency response curve
dBr
+140 +135 +130 +125 +120 +115 +110 +105 +100 +95 +90 100 200 500 1k 2k 5k 10k
*
Reference equivalent threshold sound pressure level (re 20 µPa) for the HDA 280 headphones and a coupler as per IEC 60318-3 * additional values following ISO 389-1
Peak-to-peak RETSPL
Hz
Measured with B&K 4152 as per IEC 60318-3 Headphone input voltage 500 mVrms
For clicks, 20 Hz � on an ear simulator as per IEC 60318-1 and � on an acoustic coupler as per IEC 60318-3 pe RETSPL = 31.5 dB (re 20 µPa).
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