VISA Programming Examples How to Measure Power using FETCh and READ
198 Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition
       else 
         {
          /* only errors should be displayed */
          if(errMsg[0] != '+') 
          printf("error:%ld --> %s\n", err_status,errMsg) ;
         }
  }