Frequency Range
Discrete Frequencies: 125, 250, 500, 750, 1000, 1500, 2000, 3000, 4000,
6000, 8000 Hz
Accuracy: ±2%
Total Harmonic Distortion: <2.5% measured acoustically at the maximum Hz for
frequencies below 5000 Hz and measured electrically
above 5000 Hz.
Intensity
Ranges In increments of 5 dB steps
125 Hz -10 to 50 dB HL
500 to 4000 Hz -10 to 90 dB HL
6000 Hz -10 to 85 dB HL
250 and 8000 Hz -10 to 70 dB HL
The above intensity ranges apply to the DD45 earphones.
NOTE: The maximum output values in dB HL are reduced by 10 dB when insert
phones (EAR 3A/5A) are used, except for 6 kHz where the maximum dB HL is
reduced by 20 dB.
NOTE: A “+10” dB button extends the maximum at all frequencies by 10 dB.
Accuracy: 125 to 4000 Hz, ±3 dB
6000 to 8000 Hz, ±5 dB
Signal to Noise Ratio: >70 dB
Tone Type
Rise/Fall Time: 20-50 msec
Continuous: Steady when present bar depressed
Pulsed: 2.5
pulse/sec
FM: ±5%, 5 Hz, Triangular modulation
Head set
DD45 Earphones with Type 51 Cushions (10 ohm impedance).
Headband: Exerts a force between 4 and 5 N when the
earphones are separated by 145mm.
1718-0100 Rev. E
viii
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