DATA-CUBE³
User Manual
Doc.:
DATA-CUBE-User-Manual
Issue:
1.3
Date:
15-May-2020
© DiGOS Potsdam GmbH
Page 20 / 24
Example for tunnel installation:
The DATA-CUBE³ can be used for measurements without permanent GPS reception and still get precise
timing.
The general procedure is as follows:
1. The DATA-CUBE³ has to be powered outside the tunnel until it received a GPS fix (only then the
DATA-CUBE³ starts to record data from the sensor)
2. While powered (no interruption of the power supply), the DATA-CUBE³ has to be installed inside the
tunnel.
3. The measurement must not be interrupted during installation (i.e. neither disconnect the power sup-
ply nor use the USB port for data download).
4. After the tunnel measurements are done, the DATA-CUBE³ has to be brought to the outside again
and wait for it receiving a final GPS fix.
5. Only after it has received a GPS fix, the DATA-CUBE³ can be switched off or a USB cable can be
connected for downloading data.
In post-processing with the CubeTools, cube2mseed performs a resampling of the data with the first and last
GPS fix. This is based on a linear clock drift.
Depending on the installation (e.g. larger batteries or mains power available in the tunnel), the DATA-CUBE³
Type 1, which has an internal GPS antenna and also the internal power supply by 2x d-cells, is
recommended for this application. It can *additionally* be powered externally for a short time.
This makes it possible to:
1. Use DATA-CUBE³ Type 1 with d-cells during GPS fix acquisition outdoors
2. Go in and prepare the installation
3. Connect the large external battery or the power supply to the DATA-CUBE³
while it is powered by d-
cells, and then remove the d-cells quickly (the
DATA-CUBE³ can be supplied with power for a short
time by internal and external
means [e.g. 30s], but not too long)
4. After measurement is done insert the d-cells again and disconnect the DATA-CUBE³ from the big
batteries or mains power supply. Then the DATA-CUBE³ must be brought back outside to receive the
GPS fix again.
