In one embodiment, the present disclosure describes can be used to measure the ion equilibrium in (10) ionization equilibrium devices, circuits and techniques. Includes two conductors and (23, 24), the first conductors of the conductor (23), is exposed to the output of the ionization apparatus, the second conductor of the conductor circuit to be described, (24 ) is provided is shielded from the output of the ionization system, a capacitor (22). The first conductor, to store charge to quantify the output of the ionization equilibrium system. The switch (29) may, so as to control the output of the ion source, is adjusted to be used to measure the accumulated charge on the conductors of the first, so as to discharge the first conductor at periodic intervals To generate a feedback that can be used for signal processing may be performed in the discharge measurement. [Selection Figure Figure 2
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