The NEBB Professional 2024 - Quarter 2

Figures 2 - 3: Range Setting on Real Time Analyzer SLM Display Not Set Correctly The intent of Figures 2 and 3 is to resemble the sound level meter display. Figure 2 shows measured sound levels with the Real Time Analyzer (RTA) display range set so that none of

the octave band sound levels exceed the upper display range limit of 80 dBZ.

Figure 3 shows the same data, with the exception of the RTA display range set to 70 dBZ. Note, if all we see is Figure 3, we do not know what the sound levels are in the 31.5 and 63 Hz octave bands.

Figure 2: SLM Screen showing Actual Sound Levels with Range set from 10 to 80 dBZ

80

70

60

50

40

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20

Sound Pressure Level, dB, re 0.00002 Pa

10

16

31.5

63

125 250

500

1000

2000 4000

8000

16000

Frequency, HZ

Figure 3: SLM Screen with Range set from 10 to 70 dBZ

70

60

50

40

30

20

Sound Pressure Level, dB, re 0.00002 Pa

10

16

31.5

63

125 250

500

1000

2000 4000

8000

16000

Frequency, HZ

The NEBB Professional | Quarter 2 | 2024

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