internal FrequencyCounterInput(FrequencyCounter phid, int index)
 {
     this.index = index;
     this.phid = phid;
 }
 internal FrequencyCounterInputCollection(FrequencyCounter phid, int numInputs)
 {
     this.phid = phid;
     for (int i = 0; i < numInputs; i++)
     {
         this.InnerList.Add(new FrequencyCounterInput(phid, i));
     }
 }