Campbell Scientific OBS-Mobile Software for Archer-OBS - Manual (Page 20)

Section 1. Operations
1.18 Erasing Data Memory
To erase the flash data memory, do the following:
1) Click on the OBS-3A pop up menu.
2) Select “Erase Flash Memory.”
3) The erased-block-interval counter will be displayed every 100 blocks.
There are 8192 blocks and the process takes ~ 1/2 hour.
By following this procedure data in the FLASH memory is erased, so be
careful!
1-14