7  http://www.litron.com.tw Detetion System Phtomultiplier Detection Photodetector Module 190nm to 4.8μm AP Part #    Code PMT Type Combines SP photodiode detector (AD4XX :covering a wide    wavelength range with Si, InGaAs, PbS, and PBSe photocells)   , programmable charge integrator, and data conversion in a    compact package. Expandible with add-on modules for cooled sensor capability. Null function for background noise subtraction. Programmable gain ranges. Easy to install and use on any SP Monochromator The unit contains an internal programmable charge integration    amplifier, a 20-bit A/D converter, and a microprocessor with a    RS232 interface. Photdiode    Part # AD421                 Si           5.8X5.8    190-1000        25        0.4A/W at 1550nm               20pA AD427*              PbS            3X3      1000-2900    25/-10    5x10^4V/W at 2200nm       0.5 to 2.5MΩ AD429*             PbSe           3X3      1500-4800    25/-10    5x10^2V/W at 4μm             0.3 to 1.5MΩ AD430             InGaAs         3 dia      800-1700     25/-10    0.95A/W at 1.55μm                15nA AD431           Si/InGaAs    2.4x2.4     300-1700       25        0.45A/W at 0.94μm                30pA                                              1 dia                          25/-10    0.55A/W at 1.55μm                 1nA Detector Dark resistance      or currnet Size (mm) Range (nm) Sensitivity Temp () Provides a complete detection system for SP ’s monochromators. Easy USB2.0 interface. Wide selection of PMT’s              AD311                      R928                 185 - 900nm;                                                                        S-20 (extended)                  AD321                      R212                185 - 650nm; S5              AD322                      R406                400 - 1100nm; S1              AD323                      R777                185 - 850nm; S-20              AD324                      R636                185 - 930nm;                                                                       GaAs (extend)               Wavelength Range & Spectral Response Typical Photocathode Spectral Response Characteristics *Requires 450 Hz chopper optical signal