Elekta Neuromag NM21283A, User Manual, Page: 65 / 85

Miscellaneous 11
NM21283A-A 59
11.7 Synchronizing Janitor
If the pre-amplifier power is brought down, the registers on the boards
lose their contents. Currently this situation is not automatically noticed by
the Janitor (electronics software driver running at the real time comput-
ers). Janitor can be forced to update all values in the electronics by giving
a “sync” command. This can be easily achieved by selecting the
Com-
mands > Sync Janitor
command from the menus. In normal situation
this command just refreshes all registers in the dewar-top electronics, so it
should not cause any harm to issue the command.
11.8 Using SSP
Noise reduction based on signal space projection (SSP) can be used in
several measurement mode. Modes that allow the noise reduction have a
parameter xxxSSP, where xxx depends on the measurement. The need of
using the noise reduction depends on case to case. The normal tuning can
be performed without SSP, unless the environment is very noisy. On the
other hand, spectra calculated for the magnetometers are severely affected
by the external noise, unless SSP is used.