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A complete open, short, and load calibration must be performed before calibration can be turned on. Valid distance to fault plots require a non-zero frequency span. Distance-to-fault measurements cannot be performed with CAL OFF. Attempting to print a display with no printer selected. Select a printer, then retry. Attempting to perform a Power Monitor zero adjust function with no RF detector connected to the Site Master. Attempting to perform a Power Monitor zero adjust function with an input of