The CMS ECAL Very Front End Electronics Production and Test

The CMS electromagnetic calorimeter consists of about 76000 lead tungstate crystals. A brief description of the readout electronics chain of the calorimeter is given. About 15000 Very Front End (VFE) cards amplify, shape and digitize the signals of the photo-detectors attached to the crystals. The production and the test program for these VFE cards are presented. The test program includes the power on test, the burn in and the calibration of the read out channels. Preliminary results of the tests performed on 420 pre-series VFE cards are presented.