To guarantee identical charging of both capacitors of a stage, potential resistors Rp
must be arranged at the connection point of both capacitors (Figs. 7.11a and
7.12a). With a special circuit patented by Schrader (1971), a symmetric charging
with ±100 kV is applicable (Figs. 7.11b and 7.12b). This requires a charging unit
with symmetric output ±100 kV.