Instructions for use
Page 3
...response Characteristic SPL Max. L/R deviation Max. L red + R copper - Frequency (Hz) dB (re 20 µPa) dB (at 4 V) 125 38.5 250 25.0 500 13.0 750 9.0 1000 7.5 1500 9.5 2000 8.0 3000 6.5 4000 9.5 6000 19.0 8000 18.0 * 10000 18.5 12500 30.5 143 ± 3 144 ± 3 144 ±...60318-3 Headphone input voltage 500 mVrms Pure tone RETSPL Pure tone reference equivalent threshold sound pressure level Max. No. HDA 280 Audiometric headphones Design approved by the PTB (German national institute for use with an audiometer! nominal continuous input power...
...response Characteristic SPL Max. L/R deviation Max. L red + R copper - Frequency (Hz) dB (re 20 µPa) dB (at 4 V) 125 38.5 250 25.0 500 13.0 750 9.0 1000 7.5 1500 9.5 2000 8.0 3000 6.5 4000 9.5 6000 19.0 8000 18.0 * 10000 18.5 12500 30.5 143 ± 3 144 ± 3 144 ±...60318-3 Headphone input voltage 500 mVrms Pure tone RETSPL Pure tone reference equivalent threshold sound pressure level Max. No. HDA 280 Audiometric headphones Design approved by the PTB (German national institute for use with an audiometer! nominal continuous input power...