H8259 series is a side-on photomultiplier tube with high responsivity and low dark count. It provides 3 types of photomultiplier tubes with different spectral response ranges to meet different application requirements.
The H8259 series are photon‑counting head devices that integrate a 28 mm side‑on photomultiplier tube, a high‑speed counting circuit, and a built‑in high‑voltage power supply. The units are designed for low‑noise measurements and can be operated simply by connecting a +5 V supply. An electronic gate (shutter) circuit is included to suppress unwanted light such as excitation sources.
Three variants are offered—H8259, H8259‑01, and H8259‑02—covering spectral response ranges from 185 nm up to 900 nm. The handbook lists detailed electrical specifications, dimensional outlines, and wiring information, including recommended load resistance, gate signal connections, and power cable pinout.
| Input Voltage | +4.5 to +5.5 V |
|---|---|
| Maximum Input Current | 80 mA |
| Effective Area (H8259) | 4 × 20 mm |
| Peak Sensitivity Wavelength (H8259) | 400 nm |
| Dark Count Max. (H8259) | 200 |
| Weight | 220 g |
The device operates from a +5 V supply, with an acceptable input range of +4.5 V to +5.5 V.
A load resistance of 50 Ω is recommended.
The circuit can operate up to a repetition rate of 10 kHz.