NeuroLog NL900C Digitimer Mainframe and Power Supply

The Digitimer NeuroLog NL900 Series Mainframes and Power Supplies are housed in a fully finished, enclosed case. The case has carrying handles and it can be located either in the rack or on the bench top. The base is fitted with feet and the front pair may be extended so as to raise the front of the unit. These are easily removed, if required, for rack-mounting.

The NeuroLog mainframe has an integral module retention system, consisting of a simple, slide action lever on the power supply panel. Thus fittings such as retained screws, D-Locks, etc., on individual module front panels are unnecessary; this simplifies the modules mechanical design, reduces their cost and greatly improves the ease with which rapid changes in module arrangements can be made.

The NeuroLog power supply produces three voltages (+ 15V, +5V and -15V), stabilized against line and load variations. The voltage outputs are rated at 650mA, 3.0A and 650mA respectively. All three supplies have internal "fold-over" current limiting; the 15V supplies and in addition, are protected with rear panel fuses. Each supply has less than 15mV line ripple at maximum load. The power supply transformer employs sectionalized Winding former for additional safety and complies with the safety requirements of BS EN 60601-1 but is NOT listed as a Medical Device. The power supply provides sufficient power for any mix of single width NeuroLog modules, plus up to 2 NL750 Averagers.

A unique feature of the NeuroLog power supply is a built-in monitoring circuit which indicates (by extinguishing the power supply indicator on the front panel) excessive loading of one or more of the three supply outputs. While it is expected that a power supply failure will never occur using NeuroLog modules, the fault indication is invaluable when testing custom circuits built in the NL50 Blank Module.

The NL900 is the heart of the NeuroLog system being the rack to house the modules as well as providing the power for them to function. It also has a unique interconnection system that allows adjacent modules, in most cases, to pass signals between each other without the need for external cables.