Main Display
Un-processed EEG. Log weighted mean amplitude distribution in microvolts plus 10th and 90th centiles and maximum and minimum excursions in 2 second epochs; muscle to 50uVpp(M); percentage Beta, Alpha, Theta, Delta and VLF (<1Hz); percentage time suppression below 1uVpp(S); electrode impedance up to 30Kohms; supply line frequency interference (L); numbered event markers; date and time labels. (CFM format uses a semi-logarithminc amplitude scale, and does not have the centiles or the frequency distribution). Software can be upgraded from CD.
Main recording Operational Controls
Chart on/off.
Event Marker on/off.
EEG display gain (25 to 800uV pp)
EEG to Chart sample.
Calibration Source Select.
Time and Date Settings.
Chart speed 6 or 30cm.hr.
CFM or CFAM format display.
Main Pre-settable Controls
Multiple Electrode Derivations
Chart Speed.
Auto EEG to chart at preset intervals.
Auto AEPs to chart at preset intervals.
AEP sweep, length, filtering.
Electrical
65 Watts peak, normally 15 to 25 Watts.
Leakage current with applied part at 250volts 50Hz approximately 15 microamps ( for four channels connected). LCD display with touch-screen, hard disc, flash memory for operating system. CD-RW.
Calibration
Multiple calibration signals with headbox in its docking port. The system can compute its own frequency /phase response for correction of AEPs.
Mechanical
Weight 8 kilos approximately without paper pack.
Dimensions: 300mm wide, 230mm deep, 280mm high.
Test Software
Service and test software is installed.
RDM reserve the right to change specifications without notice. Software is copyright RDM Consultants Ltd., licensed to user. Category Mapping Technology is patented.
CFAM is a registered Trade Mark.
The CFAM4 is a fifth generation digital Cerebral Function Monitor for both routine and research monitoring. It has evolved from the original Cerebral Function Monitor (1968), CFAM1 (1975), CFAM2 (1989) and CFAM3 (1994). The basic data display format is upwards compatible with these, retaining the quantifiable trace philosophy introduced with the CFAM1. Facilities include database acquisition plus automatic data classification into categories designed by the end user. RDM Category Mapping Technology provides a simple display of category distributions. Averaged Evoked Potentials, with phase and amplitude correction, may be computed using external stimulators. Four channels of CFAM format can operate in parallel with CFM format displays so that the user may refer back to the earliest literature. Assistance can be given with research project design. New software for CFAM upgrades is developed in consultation with customers.
