Chart recorder

摘要

An improvement to a chart recorder where the chart paper is driven by a motor responsive to pulses counted by a microprocessor makes it possible for the operator to set the pen to a major grid line on the chart at any time after initialization by merely pressing a key. Using a programmed counter the microprocessor keeps track constantly of how many counts the paper has advanced and how far it is to the next major grid line. Upon key command the microprocessor through a software routine advances the paper to the next major grid line. If desired, the routine can also be programmed to raise the pen during advance and lower it at the major grid line.