Abstract
We describe design, circuitry and the performance of a programmable system (FRAM 77 HV System) to supply and control high voltages in a large scintillation counter system. Sixty four HV channels are housed in a single crate preserving modular construction. A programmable CAMAC unit remotely controls the HV system through a high speed serial link; manual control is provided by a special purpose unit. In the HV crate the analog-digital interface uses a time-multiplexed technique. Each HV generator is a switching DC-DC converter with pulsewidth modulation. It supplies up to 2 mA from 0.3 to 3 kV. Digital resolution, both in setting and reading operation, is 1 V; overall stability is better than 0.2%.
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