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The camera of the Large Size Telescopes (LSTs) of the Cherenkov TelescopeArray (CTA) consists of 265 photosensor modules, each of them containing 7photomultiplier tubes (PMTs), a slow control board (SCB), a readout board, anda trigger logic. We have developed the SCB, which is installed between the 7PMTs and the readout board. The main task for SCBs is the controlling of thehigh voltages for the PMTs and the monitoring of their anode currents. Inaddition, the SCB provides the functionality to create test pulses that can beinjected at the input of the PMT preamplifier in order to emulate a PMT signalwithout the need of setting a high voltage, or even without the PMT itself. Thetest pulses have a very similar width as the PMT pulses (less than 3 ns FWHM)and their amplitude can be adjusted in a wide dynamic range. These featuresallow us not only to test the functionality of the camera modules but also tofully characterize these. We report on the design and the functions of the SCBtogether with the results of test measurements.

Development of Slow Control Boards for the Large Size Telescopes of the Cherenkov Telescope Array