Svantek Shawcity SVAN 977C, User Manual

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113 SVAN 977C User Manual
3. Start the measurement process with
the
<Start> key. 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.
5. After the data recording process ends,
the instrument starts the calculation of
the reverberation time results. During
this
process, the messages
„Calculations…” and “Reading
Logger…” appear.
6. To save results press the <Save> key
or use the File menu option.
Note: During the data collections in the tested room all other sources of sound should be suppressed
to not affect the measurements.
12.5 V
IEWING
RT60
RESULTS
The RT60 measurement results for all 1/1 or 1/3-octave bands and three Total values can be viewed in three
different view modes as:
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.
You may switch between the view modes with the <Alt> and
◄ / ► keys pressed together.
Table of RT60 results
The table presents reverberation time as:
- 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 band with the selected
parameters (Noise Mar.) the required measurement conditions were not fulfilled to obtain the results
(for more details see Appendix E).