64 Bedrock SMxx operating manual © Bedrock Audio BV, 2019
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11.3. Resetting measurement number series
Even if you completely remove the measurements from the device, the SMxx will continue
the measurement numbering series where it left off. In order to prevent duplicate numbers,
the counter is not automatically reset. If you wish to reset it manually (restarting at num-
ber 1), you need to remove all .csv files. as well as the file named _INDEX.DAT. Every
directory that holds measurement data (SPL, RTA, STIPA, etc) has its own measurement
number sequence and its own _INDEX.DAT.
11.4. About the file format
Note that the .csv format is not a formal standard; differences in interpretation of the .csv
file format exist even between different versions of MS Excel. This results in the fact that
the output files from the SMxx may be imported very easily in some versions of Excel, and
may require more attention in other versions of Excel. If you are having problems import-
ing the output files into Excel, import the files as “text files” rather than .csv. It may help to
rename the files to another extension than .csv (e.g. .txt).
11.5. Downloading recorded audio
If the “record audio” option is turned on in the system settings, then all audio recordings
are saved in the same folders as the .csv files with measurement data. The following applies
to stored audio recordings:
• Audio is stored in .wav format (single-channel 48 kHz floating point PCM),
which is easily read by many applications
• The audio is normalized to exactly 150.0 dB at full scale. Different audio
players may show the value of full scale differently; often full scale is nor-
malized to a value of 1.
• Note that the level calibrations are implicitly preserved by this normaliza-
tion relative to full scale. This allows for easy further processing by acoustic
analysis software.
• Stored audio files take up considerable amounts of storage space (about
700 MB per hour). This fills up the storage capacity of the device relatively
quickly.
• On a related note, keep in mind that downloading large amounts of re-
corded audio data to a PC over the USB2.0 interface will take some time.
11.6. Further use of USB
Firmware updates are also done by connecting the SMxx via USB. Instructions on how to
perform firmware updates are given in the chapter 16 of this manual.
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