| 摘要 |
A microprocessor-controlled depth recorder wherein strip chart recording is effected by use of a thermal printing head and wherein the microprocessor is programmed for the selective printing of any one of a plurality of depth ranges and the optional simultaneous printing of chart scale data and alphanumeric indicia along with echo soundings. For high resolution printing, the thermal printing head comprises 110 resistive elements, multiplexing being utilized to reduce the resistive element driving circuits from 110 to 21 by dividing the 110 resistive elements into 10 groups of 11 dots each.
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