Abstract

A simple implementation of a commercially available high-voltage power supply is described whereby the power supply can be used for voltage biasing of a photomultiplier tube operating either in a constant dynode voltage or in a constant output current mode. In the constant current mode, low frequency fluctuations in the current are suppressed without attenuation of a high frequency signal. Both the phototube output current and the dynode voltage can be set by external voltages in the range from −10 to +10 V, making computer control easy with standard digital-to-analog converters.

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