R649

PHOTOMULTIPLIER TUBE R649 For Photon Counting 51 mm (2 Inch) Diameter, 12-Stage, Multialkali Photocathode, Head-On Type GENERAL Parameter Spectral Response Wavelength of Maximum Response Material Photocathode Minimum Effective Area Window Material Structure Dynode Number of Stages Base Suitable Socket Description/Value 300 to 850 420 Multialkali 5×8 Borosilicate glass Box and Grid 12 21-pin glass base E678-21A (supplied) Unit nm nm — mm — — — — — MAXIMUM RATINGS (Absolute Maximum Values) Supply Voltage Average Anode Current Ambient Temperature Parameter Between Anode and Cathode Between Anode and Last Dynode Value 1500 250 0.01 -80 to +50 Unit Vdc Vdc mA °C CHARACTERISTICS (at 25°C) Cathode Sensitivity Anode Sensitivity Parameter Luminous (2856K) Radiant at 420nm Red/White Ratio (R-68) Luminous (2856K) Radiant at 420nm Min. 80 — — 100 — — — — — Typ. 120 51 0.2 800 3.4 × 105 6.7 × 106 200 13 70 Max. — — — — — — 350 — — Unit µA/lm mA/W — A/lm A/W — cps ns ns Gain Anode Dark Counts (after 30min. storage in darkness) Anode Pulse Rise Time Time Response Electron Transit Time NOTE: Anode characteristics are measured with the voltage distribution ratio shown below. VOLTAGE DISTRIBUTION RATIO AND SUPPLY VOLTAGE Electrodes K G Dy1 Dy2 Dy3 Dy4 Dy5 Dy6 Dy7 Dy8 Dy9 Dy10 Dy11 Dy12 P Ratio 4 0 2.5 1.5 1 1 1 1 1 1 1 1 1 1 Supply Voltage: 1000Vdc, K: Cathode, Dy: Dynode, P: Anode Subject to local technical requirements and regulations, availability of products included in this promoti...