| 摘要 |
A chart recorder has six pens (26) which traverse respective paths spaced in the direction of chart advance. The input signal for each pen (26) except the first (26a) is sampled and fed into a shift register (50) which has a number of stages related to the spacing between its associated pen (26) and the first pen (26a), and which is clocked at a rate dependent on the speed of chart advance. The delayed signal emerging from the shift register (50) is fed to the pen (26), the effect of the delay being to cause simultaneous events in the different signals to be recorded at the same longitudinal position on the chart. A single shift register (150) can be operated in a multiplex mode to receive all the input signals to be delayed, or the signal samples can be cyclically stored in and extracted from the memory (278) of a microprocessor.
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