A dialysis service box for centralized control and plumbing arrangement of a dialysis machine is disclosed. 5% FFA includes a combination of partial glycerolysis of HFFA oils to produce LFFA oils and subsequent stripping of LFFA oils to produce NFFA oils via steam distillation. The purpose of the two power levels is to obtain a slope and offset for correction of the RF power measuring device being calibrated. In one aspect, the trace system includes a trace buffer which receives trace information at an internal clock speed of the processor. The control terminals of the first and second transistors collectively receive a differential input signal.