The maximum display time in the Chart Recorder is based on a computation of how much memory is available to be allocated. The computation includes the block size, sample rate, as well as the amount of memory on the computer.
To display more time, you must reduce the amount of data to reduce the effective sampling rate being charted. You can use the Average Module or the Separate module to accomplish this.
There are some conditions where the actual sampling rate and the channel sampling rate are not the same - triggered data is an example of this, and data from the RS232 Input and ICOMS Input may be labeled in a way that leads the Chart Recorder to believe that the data channel has more data than it does.
Please provide more information about your application - what is the data source of the data that you are displaying, what is the sampling rate and block size? How much memory does your computer have?
--cj
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