Users Manual

FIELD EQUIPMENT
NUSEIS
Geophysical Technology Inc Field Equipment Page | 21
o Requires a bump to bring the NRU up to full power state.
o White LEDs will show on the NRU for approximately 2 seconds after the bump.
o After 10 seconds, if the NRU is vertical and upright, and the accelerometer detects no
movement for an additional 3 seconds, the NRU will flash a green LED 5 times indicating
a successful deployment. Successful deployment in this case means that it has started
the process of acquiring GPS data.
o The NRU will then go through the typical routine of acquiring GPS and getting System
time lock, then doing internal tests. The LED will flash green 5 times indicating good
internal tests and recording will start.
o An NRU that is set in Auto-Deploy state, can be undeployed or shutdown, and will return
to a deployed state after a bump.
• Undeployed – in this state the NRU is partially active. The NRU is not recording, the GPS receiver
is in a low power mode, the system clock is not locked, status is being broadcast.
o This state can be set during upload or commissioning, NuScribe manual Appendix B.
o Use NuSite in the field to Undeploy, see NuSite manual Deploy/Undeploy section.
o To undeploy in the field without NuSite, pick the NRU up and hold it in an upright
position for 2 seconds. Turn the NRU upside down. Hold it steady upside down for 3
seconds. The yellow LEDs will blink 5 times indicating that the NRU has undeployed.
▪ If for some reason the NRU doesn’t indicate a successful undeployment while
upside down, repeat the procedure, but make sure to be very steady in the
movement from upright to upside down.
▪ The NRU will not undeploy if it senses movement.
• Shutdown – powered off. This can be done during data upload, commissioning, or with NuSite in
the field. See NuSite manual Shutdown/Cannot Shutdown section, NuScribe manual Appendix B.
o To take the NRU out of shutdown mode, it will either need to be bumped or placed on
charge.
o For normal operation, GTI suggests to only use Shutdown for transport/shipping or for
storage. Typically during seismic operations the NRUs would not need to be Shutdown,
only set as Undeployed or set to low power state after commissioning.
Commissioning
• See the NuScribe manual Rack View section.
• Parameters for the current project will be set during commissioning.
• Firmware levels can be checked and corrected if not current. This should only be done at the
start of a project. Typically firmware levels should not change during a project unless specifically
instructed by GTI.
• Setting the mode and state of the NRU at the end of commissioning or uploading is an
operational decision.
o Many variables can come into play when deciding which mode to set the NRU to. For
example, storage time after programming, recording time required, days in the field, roll
requirements, etc.