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What to set for upper & lower limit on analogue outputs channel of PowerLogic PM800 series meter when Real Power, Total in MW - Customer need a 4 - 20 mA output at 0 - 50 MW

Real power,total: the setting of upper and lower values depand on the power scale value.  So for example, if we want to represent 0 and 50MW with analog output.
case a: power scale=1000, then we need to set upper value to 50;
case b: power scale=100, then we need to set upper value to 500. 
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