The system is comprised of 211 relays, their associated
control circuitry, and a power supply.
The software uses an assembly language routine that constantly
refreshes at a very high speed, preventing noise from energizing relays
that
should not be energized.
The relays are turned on and off in a sequence that removes
current from their contacts first in order to minimize contact wear.
Diagnostic routines include complete tester calibration,
individual relay tests, and ohm meter continuity tests.
The software automatically selects a proper filament voltage
that
takes into account the transformer, wiring, and relay contact voltage
drops.
More details and pictures can been
seen in the Photo
Gallery.
The database contains the data from all of the following card sets:
The complete "large" military card set
The Western Electric card set
The CA-4 adapter card set
The CA-5 adapter card set
The older tubes from the Model 123A card set
In addition, tubes are added to the database from time to time.
Or,
you can add them yourself. Click here for
the
current list.