R2257

PHOTOMULTlPLlER TUBE R2257 For visible to near IR low light detections Extended red multialkali photocathode 51mm(2 Inch) diameter, 12–stage, Head–on type GENERAL Parameter Spectral Response Wavelength of Maximum Response MateriaI Photocathode Minimum Effective Area Window Material Structure Dynode Number of Stages Anode to Last Dynode Direct Interelectrode Capacitances Anode to All Other Electrodes Base SuitabIe Socket Description/Value 300 to 900 600 Extended red multialkali 46 Borosilicate glass Linear focused 12 2 2.5 21–pin glass base E678–21A(supplied) Unit nm nm mm dia. pF pF MAXIMUM RATINGS (Absolute Maximum Values) Parameter Between Anode and Cathode Supply Voltage Between Anode and Last Dynode Avarage Anode Current Ambient Temperature Value 2700 500 0.2 -80 to +50 Unit Vdc Vdc mA CHARACTERISTlCS (at 25 Cathode Sensitivity ) Min. 140 Typ. 230 50 0.35 100 2.2 104 4.3 105 30 2.6 48 Max. Unit A/lm mA/W A/lm A/W 100 nA ns ns Anode Sensitivity Gain Dark Current (after 30min. storage in darkness) Time Anode Pulse Rise Time Response Electron Transit Time Parameter Luminous(2856K) Radiant at 600nm Red/White Ratio (R–68 filter) Luminous(2856K) Radiant at 600nm 15 NOTE: Anode characteristics are measured with the voItage distribution ratio shown below. VOLTAGE DlSTRlBUTlON RATlO AND SUPPLY VOLTAGE K G Dy1 Dy2 Dy3 Dy4 Dy5 Dy6 Dy7 Dy8 Dy9 Dy10 Dy11 Dy12 Electrodes Ratio 4 0 1 1.4 1 1 1 1 1 1 1 1 1 1 SuppIy Voltage : 1500Vdc, K : Cathode, Dy : Dynode, G : Grid, P : Anod...