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SVANTEK 977W User Manual
Note: The proper value of the sound level trigger threshold should be set well above
the background noise and significantly below the maximum sound level emitted by the impulse
source.
2.
Place the microphone in one of the selected
measurement points (for the measurement
points location see the reverberation time
measurement ISO standard).
3.
Start the measurement process by pressing
the
<Start/Stop>
push-button. The display
indicates that the instrument is waiting for the
trigger condition fulfilment.
4.
Fire the impulse sound power source. If the
trigger condition is fulfilled the instrument
starts to collect data.
9.
After the data recording process ends, the
instrument starts the calculation of the
reverberation time results. During this
process the message „Calculations…” and
“Reading Logger…” appear.
5.
To save results press the
<Save>
push-
button or use the
File
menu option.
Note: During the data collections in the investigated room all other sources of sound should be
suppressed to not affect the measurements.
13.5. Viewing of the RT60 results
The
RT60
measurement results for all 1/3 octave bands and three Total values can be viewed in three different
view modes:
1. Table of
EDT
,
RT20
,
RT30
and
User
results;
2. Bar plot of
EDT
,
RT20
,
RT30
and
User
results;
3. Plot of sound pressure level decay curves.
The user may switch between the view modes by means of the
<Alt>
and
◄ or ► push-buttons.
Table of RT60 results
The
table
presents
the
results
of
reverberation time for different
RT60
results:
-
EDT
- early decay time;
-
RT20
- reverberation time calculated
with 20 dB dynamics;
-
RT30
- reverberation time calculated
with 30 dB dynamics;
-
User
- reverberation time, calculated
with the user defined dynamics.
►
Note:
If “- - -*” text appears in the RT indicator field, it means that for this 1/3 octave band with
the selected parameters (Noise Mar.) the required measurement conditions were not fulfilled to
obtain the results (for more details see Appendix H).
