^ +15V
                     /_\
                      |      
          _________|\ /                     Pease Offset Format
         |     -   |+\       ___  +1mV
        _|_    1mV |  \_____|   |____     <-- Measure
        ///    +   |  /  |  |___|   _|_       referenced 
               ____|-/   |         |DVM|      to ground
              |    |/ \  |         |___|
              |      _|_ |          _|_
              | -15V \ / |          ///
              |       v  |
              |__________|