Model 831 Manual Return to Sound Level Meter Mode 15-29
Measure reverberation time three or more times for each
source-microphone combination. At least twelve
independent source-microphone combinations are required,
see Table 15 - 3 'Minimum Number of Positions and
Measurements'.
Return to Sound Level Meter Mode
A shortcut is to press the
3
key and
then the
8
key to select the SLM
icon.
When the RT-60 mode is active, select the SLM icon in the
Control Panel to return to Sound Level Meter mode, as
shown in Figure 15-35.
Survey Engineering Precision
Source-microphone combinations 2 6 12
Source-positions
1 2
Microphone-positions 2 2 3
No. decays in each position
(interrupted noise method)
123
Method
Impulse or
Interrupted
Interrupted Interrupted
Filter bandwidth 1/1 1/1 or 1/3 1/1 or 1/3
Frequency Range (minimum)
250 Hz to 2 kHz 125 Hz to 4 kHz (1/1)
100 Hz to 5 kHz (1/3)
Standards ISO 10052 ISO 140
Table 15 - 3 Minimum Number of Positions and Measurements
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