Here is what one sees when running a MCA PHA "test" in DebugMode (from the Output menu)...
Setting spectro 2 PHA (BWGBMD): .5 3 1003 1250 -1 .0000038
Moving to crystal and on-peak spectrometer positions...
SX100MoveMotor: 2 to 27644 at speed 3000
Moving motor 2 from 32295 to 27644
Setting column conditions (TKCS)...
Inserting faraday cup or blanking beam
Faraday cup inserted or beam blanked
Setting operating conditions (TKCS): 40 15 50 0
Setting operating conditions (TKCS): 40 15 50 0
Setting operating conditions (TKCS): 40 15 50 0, getting current conditions...
SX100SetConditions: current conditions (TKCS) = 40 15 51.5915 0
SX100SetConditions: static variables (TKCS) = 40 15 50 0
SX100SetConditions: ForceAnalyticalConditions = 0
SX100SetConditions: OperatingVoltageTolerance = .002, BeamCurrentTolerance = .01
SX100SetConditions: beam current error = 51.5915 / 50 = 3.18300 %
Setting operating conditions (TKCS): 40 15 50 0, setting beam current...
SX100SetConditions: set beam current = 50
Setting operating conditions (TKCS): 40 15 50 0, setting beam size...
SX100SetConditions: set beam size = 0
Operating conditions set (TKCS)
Setting beam mode (Analog Spot)...
Setting beam mode (Analog Spot)...
Setting magnification: 40000
Setting magnification to 40000...
Magnification set to 40000
Removing faraday cup or unblanking beam
Faraday cup removed or beam unblanked
Acquiring PHA acquisition...
Setting spectro 2 PHA (BWGBMD): .5 3 1003 1250 -1 .0000038
SX100GetPHADistributionMCA2: Motor= 2, Status= 1, MaxTries= 0
SX100GetPHADistributionMCA2: Motor= 2, Status= 0, MaxTries= 1
SX100GetPHADistributionMCA2: Motor= 2, Acquisition number=1
SX100GetPHADistributionMCA2: Baseline= 804
SX100GetPHADistributionMCA2: Window= 5627
SX100GetPHADistributionMCA2: Alignment= 0
SX100GetPHADistributionMCA2: Index= 256
SX100GetPHADistributionMCA2 (Byte): Min= 0, Max= 246, CountTime= 0.035
SX100GetPHADistributionMCA2 (PHA Sum): Min= 0, Max= 236.5714
SX100GetPHADistributionMCA2 (Averaged): Min= 0, Max= 236.5714
SX100GetPHADistributionMCA2 (Normalized): Min= 0, Max= 6759.184
Note that the returned "baseline" and "window" from the MCA PHA acquisition are 0.804 and 5.627 volts respectively.