Users Manual

FIELD EQUIPMENT
NUSEIS
Geophysical Technology Inc Field Equipment Page | 22
o The NRU should be placed in Shutdown mode if it is to be stored for a long period or if
being readied for transport/shipping.
Bumping
• When an NRU has been placed in Shutdown or an Auto-Deploy low power state, turn it back on
or bring it up to a fully On state by bumping.
• Bumping involves momentarily touching a DC voltage to the power contacts on the cap
assembly.
• The DC voltage can be between 6 and 12 volts, i.e. a 9-volt battery. Polarity must be observed.
Positive terminal is on the top MIM, with the NRU upright. Reversing the polarity will do no
harm, but the NRU will not bump on.
o M series NRUs can be bumped with a 9 volt battery or a Bump Tool
o N series NRUs should not be bumped with a 9 volt battery as the pins are too close to
allow reliable bumping. Only the supplied N Series Bump Tool should be used.
• For an NRU that is bumped when in a low power Auto-Deployed state, it should go through the
following sequence.
o White LEDs will show on the NRU for approximately 2 seconds after the bump.
o After 10 seconds, if the NRU accelerometer detects no movement for an additional 3
seconds, the NRU will flash green LEDs 5 times indicating a successful deployment.
o The NRU will acquire GPS and System Clock and GPS clock will lock.
o The LEDs will start flashing white continuously, for approximately 45 seconds, indicating
that internal tests are running.
o Green LED will flash 5 times indicating recording has begun.
 An NRU cannot be bumped when the CPU is in an Active state, as seen in the NuSite Unit
Status field. For instance, if an NRU has just been undeployed, or has just come off charge,
the CPU will be active.
o If a NuSite device is available, monitor the Unit Status field until the CPU shows as
Inactive, then battery bump the NRU.
o If no tablet is available, wait a short time and try the battery bump.
o If Deploying with the NuSite device instead of a battery bump, you will not need to
wait for the CPU Active status to change. Deployment can be done immediately
without waiting.
• When a Shutdown NRU is bumped on
o If Shutdown in a Deployed state.
▪ White LEDs will flash once for 2 seconds indicating that the NRU is turning on.
▪ The NRU should be quickly placed in the ground
▪ The NRU will acquire GPS and System Clock and GPS clock will lock.
▪ The LEDs will start flashing white continuously indicating that internal tests are
running.
▪ Green LED will flash 5 times indicating recording has begun.
o If Shutdown in an Undeployed State, and commissioned with the Deploy option
▪ White LED will flash