Multichannel recorder for equidistant recording of significant changes of a measured variable in each channel

A multichannel point recorder comprising

• multiplex scanning means for sequentially scanning a plurality of input measured variables;
• memory means for storing values applied thereof and for supply stored values as memory output signals,
• recording chart means including a recording chart and drive means arranged to effect a longitudinal displacement of the chart with respect to time;
• a recording head displaceable transversely across the chart for recording on the chart;
• discriminator means arranged between said multiplex scanning means and said memory means for evaluating for each measured variable at each scanning cycle of said scanning means whether the difference between the last value of said measured variable stored in said memory means and the presently scanned value is equal to or greater than a given constant representing a distance between two printing points on the recording chart by said recording head and, if not, whether the summed displacement of the recording chart is equal to or greater than said constant with a subsequent storage in said memory means of the value of measured variable and the recording chart displacement meeting at least one of said evaluations and
• recording head control means under control of the stored data in said memory means to record by said recording head the values of said measured variables stored in said memory means.