I have a script which polls a piece of vacuum equipment and retrieves 4 voltages. The voltages are then converted to pressure using the following CDEF RPN statement:
The RRD file still contains the raw voltages, but the graph uses this CDEF function to convert the values to Torr.
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I would like to create a threshold for these graphs so that if the pressure rises above 6.0e-8 or thereabouts it will trigger an email warning.
The instructions for THOLD specify that I must use the RAW data values for the thresholds, which I have done. I think this is working, but I would like the thresholds to appear on the graph at the converted values NOT the raw values.
As you can see the threshold lines appear at 3.8/4.0 (the RAW values) instead of 6.3e-08 and 1.0e-07 (the Torr values)