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VB20SL User Guide
Level
o
The 'LEVEL' option should be enabled (set to YES) when the antennas are mounted within 10
of each other and the expected Pitch/Roll measurement will
o
not exceed 10
. With the LEVEL option enabled the GPS engines maintains its RTK lock more efficiently and the Slip and Pitch channels are less likely to
drop out.
o
then the 'LEVEL' option should be disabled (set to 'NO').
If the expected Pitch or Roll angles will be greater than 10
Note: when the antenna separation is <2M the RTK lock is very resilient in most conditions and scenarios when the 'Level' option is not enabled.
Memory Cards and Logging
The VB20SL stores logged data onto SD Cards. The supplied SD cards are already optimised for use on the VB20SL and as such do not need formatting
before use. Should the SD Card need formatting due to card errors it should only be formatted using the 'Format Compact Flash' option in the VBOXTools
software. The SD Card will need to be inserted into an SD Card reader (or a VB20SL set to 'Card Reader' USB Mode) for this to work.
When logging data to an SD Card the OLED display will show the name of the current file at the bottom of the display. It is important not to remove the SD
Card while the VB20SL is logging. If the card is removed while the VBOX is writing data to it, there is a risk that the data file may be corrupted resulting in loss
of data. If 'Log only when moving' is the logging mode selected then wait a short time after the vehicle has stopped for logging to finish and the filename to
disappear from the screen. If 'Log continuously' is selected, press the Start/stop logging switch if connected or press '■' on the front panel. This will enter
the on-board configuration screen and close the file so that the card can be removed.
It is recommended that files are removed from the disk regularly as writing continuously with out fragments is easy. The more file fragments the
harder it is to stream data to the card.
There are two Logging modes:
'Log only when moving' : In this mode the VBOX will start to log data only when a speed higher than 0.5km/h is detected.
'Log continuously': Data is continuously logged to the SD card regardless of vehicle velocity or the number of satellites.
To set channels to be logged, they must be selected in the VBOX setup window of VBOXTools, see the VBOXTools manual for further information.
Maximum Log channels without Kalman Filter enabled = All standard channels plus 20 input channels
Maximum Log channels with Kalman Filter enabled = All standard channels plus 10 input channels
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