Side-on PMT Photon Counting Head H8259 Series The H8259 series is a photon counting head device containing a 28-mm (11/8") diameter side-on photomultiplier tube, high-speed photon counting circuit, and a high-voltage power supply circuit. The photomultiplier tube sensitive in the near IR region usually has a large dark count due to thermal noise but high S/N measurements can be obtained since a low-noise photomultiplier tube is selected. The high voltage supply for photomultiplier tube and the discrimination level are preset to optimum values, allowing photon counting measurement by just connecting a +5 V supply. An electronic gate circuit (shutter circuit) is also included to eliminate extraneous light such as excitation light from the measurement. Product Variations Type No. H8259 H8259-01 H8259-02 Spectral Response 185 nm to 680 nm 185 nm to 850 nm 185 nm to 900 nm Features Low dark count in UV to visible range Low dark count in UV to near IR range High sensitivity and low dark count in UV to near IR range This product can't be used at vacuum environment or reduced pressure environment. Please pay attention when the H8259 series is used for measuring the light below 190 nm. Specifications (at +25 °C) H8259 Parameter Input Voltage Max. Input Voltage Max. Input Current Effective Area Peak Sensitivity Wavelength Count Sensitivity Typ. 4 × 20 300 nm 400 nm 500 nm 600 nm 700 nm 800 nm 900 nm 400 2.1 × 105 2.6 × 105 1.9 × 105 7.5 × 104 1.5 × 103 — — Count Linearity *1 Dark Count *2 Typ. Max. Gate Input Mode Switching Ratio Level Input Impedance Gate Width (FWHM) Repetition Rate Max. Pulse-pair Resolution Output Pulse Width Min. Output Pulse Height *3 Typ. Recommended Load Resistance Signal Output Logic Operating Ambient Temperature *4 Storage Temperature *4 Weight Gate H8259-01 +4.5 to +5.5 +6 80 30 80 430 2.7 × 105 3.3 × 105 3.2 × 105 2.3 × 105 6.8 × 104 1.6 × 104 — 2.5 × 106 80 200 Normally ON 1/1000 C-MOS (High level: +3.5 V to +5.0 V) 1 50 µs to ∞ 10 35 30 2.0 2.2 50 Positive logic +5 to +40 -20 to +50 220 *1: Random pulse, at 10 % count loss *2: After 30 minutes storage in darkness *3: With input voltage +5 V, Load resistance 50 Ω and Coaxial cable RG-174/U (450 mm) 56 H8259-02 4×6 400 2.5 × 105 3.0 × 105 2.5 × 105 2.0 × 105 1.4 × 105 7.5 × 104 3.0 × 102 *4: No condensation Unit V V mA mm nm s-1·pW-1 s-1 400 800 s-1 — — — kΩ — kHz ns ns V Ω — °C °C g Photon Counting Heads Characteristics (Count sensitivity, Dark count) TPHOB0023EE 104 106 TPHOB0024EE H8259-01 COUNT SENSITIVITY (s-1·pW-1) H8259-02 H8259-02 103 DARK COUNT (s-1) 105 H8259 104 H8259-01 102 H8259 101 103 100 100 200 300 400 500 600 700 800 900 5 10 WAVELENGTH (nm) AMP 20 25 30 35 40 AMBIENT TEMPERATURE (°C) Block Diagram PMT 15 Gate Timing Chart 100 µs to ∞ PULSE SHAPER COMPARATOR 50 µs to ∞ +3.5 V to +5 V at 1 kΩ OUTPUT + - RL 50 Ω LLD POSITIVE LOGIC HV POWER SUPPLY / VOLTAGE DIVIDER CIRCUIT TO PULSE COUNTER GATE SIGNAL INPUT PMT OPERATION 0V ON OFF DELAY TIME: 600 ns MAX. GND +5 V POWER INPUT DELAY TIME: 500 ns MAX. MIN. GATE "OFF" TIME: 50 µs GATE INPUT TPHOC0044EB TPHOC0023ED Dimensional Outlines (Unit: mm) DETAILS OF INPUT WINDOW SIGNAL OUTPUT BNC-R MOUNTING THREADED HOLE (4-M3 DEPTH: 10) MOUNTING THREADED HOLE (2 × 2-M3 DEPTH: 10) FRONT VIEW SIDE VIEW +2 20 -0 8 WINDOW PHOTOCATHODE TOP VIEW REAR VIEW WINDOW 55.0 ± 0.5 4.5 ± 0.3 *Internal Connection (Do not use) +0.5 1.5 - 0 EFFECTIVE AREA (H8259, -01: 4 × 20) (H8259-02: 4 × 6) 17.2 ± 0.5 85.0 ± 0.5 POWER INPUT HIROSE HR10A-7R-6P 1: GND 2: LOW VOLTAGE INPUT (+5 V) 3: IC* 4: IC* 5: GND 6: GATE 0 V: OPEN, +5 V: CLOSE +1.0 2.5 -0 6 10.0 ± 0.5 23.0 ± 0.8 5.0 ± 0.5 50.0 ± 0.5 38.0 ± 0.8 8.0 +0.5 -0 95.0 ± 1.0 27.0 ± 0.5 24.0 +0.5 -0 87.0 ± 0.5 R3 EFFECTIVE AREA (H8259, -01: 4 × 20) (H8259-02 : 4 × 6) 55.0 ± 0.5 (H8259, -01) 55.0 ± 1.0 (H8259-02) 38.0 ± 0.5 FRONT VIEW TPMOC0167EA Power cable with connector (HIROSE HR10A-7P-6S) is supplied with the H8259 series 700 ± 20 BLACK : GND RED : LOW VOLTAGE INPUT (+5 V) GREEN: GATE SIGNAL INPUT (0 V or GND: OPEN, +5 V: CLOSE) WHITE : NC BLUE : NC TPHOA0027EB 57