It is very useful to assemble small numbers of the various components into complete subsystems and check that their performance is satisfactory. There are two such systems already built, one that accomodates 384 channels and one that accomodates 4608 channels. This last one is the preamplifier box. These test stations are complete with a chain of preamplifiers, baseline subtractors and sample and holds, and ADCs. They are put together as in the real detector. The calibration pulse injection system is also available. The data acquisition system consists of a personal computor connected to the ADC. We have already used these test stations for evaluating the new preamplifier switching power supplies and preamplifier prototypes. We will also use these test stations for making measurements with the new baseline subtractor system.
