ECAL consists of ??? lead tungsten modules read out using AvalancheĀ Photo-diodes (APDs) with dedicated electronics. There are total of ??? modules divided into upper and lower halves. ECAL APDs are powered usingĀ Mod. A1520 12 Ch Flt P 500V 15mA 60Hz from CAEN house in SY1527 or SY4527 HV chassis. The voltage parameters for these channels needs to be controlled using EPICS-based GUIs.