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A picoammeter system has been developed and engineering. It consists in acurrent-voltage converter, based on an operational amplifier with very lowinput current, a high precision ADC, a radio controlled data acquisition unitand the computer-based control, visualization and storage. The precision is ofthe order of a tenth of picoampers and it can measure currents betweenelectrodes at potentials up to 8 kV. The system is battery powered and a numberof strategies have been implemented to limit the power consumption. The systemis designed for multichannel applications, up to 256 parallel channels. Theoverall implementation is cost-effective to make the availability ofmultichannel setups easily affordable. The design, implementation andperformance of the picoammeter system are described in detail as well as a anapplication: the measurement of ion backflow in MPGD-based photon detectors.

RHIP, a Radio-controlled High-Voltage Insulated Picoammeter and its usage in studying ion backflow in MPGD-based photon detectors