Instruction Manual

Sound Level Meter Types 2245 – Instruction Manual Page 61 of 110
Fig. 4.16 The shapes of the 1/1-octave band filters (from 0 to –3.5 dB). The
innermost and outermost curves show IEC 61260 limits
4.11.2 1/3-octave Band Centre Frequencies
Nominal: 12.5 Hz, 16 Hz, 20 Hz, 25 Hz, 31.5 Hz, 40 Hz, 50 Hz, 63 Hz, 80 Hz, 100 Hz, 125
Hz, 160 Hz, 200 Hz, 250 Hz, 315 Hz, 400 Hz, 500 Hz, 630 Hz, 800 Hz, 1 kHz, 1.25 kHz, 1.6
kHz, 2 kHz, 2.5 kHz, 3.15 kHz, 4 kHz, 5 kHz, 6.3 kHz, 8 kHz, 10 kHz, 12.5 kHz, 16 kHz, 20
kHz
Exact (5 digits): 6.3096 Hz, 7.9433 Hz, 10 Hz, 12.589 Hz, 15.849 Hz, 19.953 Hz,
25.119 Hz, 31.623 Hz, 39.811 Hz, 50.119 Hz, 63.096 Hz, 79.433 Hz, 100 Hz, 125.89 Hz,
158.49 Hz, 199.53 Hz, 251.19 Hz, 316.23 Hz, 398.11 Hz, 501.19 Hz, 630.96 Hz, 794.33
Hz, 1 kHz, 1.2589 kHz, 1.5849 kHz, 1.9953 kHz, 2.5119 kHz, 3.1623 kHz, 3.9811 kHz,
5.0119 kHz, 6.3096 kHz, 7.9433 kHz, 10 kHz, 12.589 kHz, 15.849 kHz, 19.953 kHz
Real-time Frequency Range (Time-invariant Range): 12.5 Hz to 20 kHz, centre
frequencies.
Fig. 4.17 The shapes of the 1/3- octave band filters (from 0 to –80 dB). The
innermost and outermost curves show IEC 61260 limits