| http://www.w3.org/ns/prov#value | - A series circuit comprised of a diode D1, a current limiting resistor R1, and current limiting zener diode DZ and diode D2 is provided between one end of the primary winding 4a and the ground to constitute a charging path for the biasing power supply, i.e. a capacitor to be discussed later, for detecting ionic current.
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