The PDM02-9111-TTL is a state-of-the-art photon counting module designed for precision and versatility in a wide range of scientific and industrial applications. At the heart of this module is a high sensitivity, low noise, 25mm diameter photomultiplier, paired with a fast amplifier-discriminator and a low power high-voltage supply. This combination of high-speed electronics and a fast photomultiplier ensures a wide dynamic range, making it ideal for detecting low light levels with exceptional accuracy. The module's positive polarity high-voltage supply is specifically engineered for maximum count rate stability, even at very low light levels, while its mumetal rectangular housing offers superior immunity to external magnetic fields.

The PDM02-9111-TTL operates within a spectral range of 280-600nm, catering to a variety of light detection needs. For applications requiring extended UV sensitivity, other versions such as the PDM02-9111W-TTL are available, expanding the range down to 200nm. With an effective photosensitive diameter of 22mm, the module facilitates efficient light collection. Moreover, it boasts a typical dark count of only 100 counts per second at 20 degrees Celsius, providing a unique detection capability that sets it apart in the market.

Designed for ease of use, the photomultiplier high-voltage and discriminator threshold level are pre-set to ensure optimal performance. This allows for straightforward photon counting operation simply by connecting the module to a +5V supply. Its fixed pulse-width TTL output is fully compatible with the ET Enterprises MCS-CT3 multi-channel scaler/counter-timer, enabling seamless integration into existing systems. Both units can be controlled and powered via a PC USB port, subject to USB port current limitations, providing a convenient and efficient solution for various photon counting applications.