Guralp Systems CMG-DCM build <10,000 - Manual (Page 226)

Acquisition Modules and Platinum Firmware Monitoring Operations
The next part of the screen provides controls to initiate calibration. The
step-calibration section provides controls for selection of components,
duration and amplitude. Not all instruments support calibration of individual
components.
The broadband noise calibration section provides controls for selection of
components, duration and amplitude. Not all instruments support calibration
of individual components.
MAN-EAM-0003 226 Issue E - February 2014