English
Language : 

H8259_15 Datasheet, PDF (1/2 Pages) Hamamatsu Corporation – Side-on PMT
Side-on PMT
Photon Counting Head H8259 Series
The H8259 series is a photon counting head device containing a 28-mm (1-
1/8") 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 extrane-
ous light such as excitation light from the measurement.
Product Variations
Type No. Spectral Response
Features
H8259
185 nm to 680 nm Low dark count in UV to visible range
H8259-01
185 nm to 850 nm Low dark count in UV to near IR range
H8259-02
185 nm to 900 nm 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
Parameter
H8259
H8259-01
H8259-02
Input Voltage
+4.5 to +5.5
Max. Input Voltage
+6
Max. Input Current
80
Effective Area
4 × 20
4×6
Peak Sensitivity Wavelength
400
430
400
300 nm
2.1 × 105
2.7 × 105
2.5 × 105
400 nm
2.6 × 105
3.3 × 105
3.0 × 105
Count
Typ.
Sensitivity
500 nm
600 nm
700 nm
1.9 × 105
7.5 × 104
1.5 × 103
3.2 × 105
2.3 × 105
6.8 × 104
2.5 × 105
2.0 × 105
1.4 × 105
800 nm
—
1.6 × 104
7.5 × 104
900 nm
—
—
3.0 × 102
Count Linearity *1
2.5 × 106
Typ.
30
Dark Count *2
Max.
80
80
400
200
800
Mode
Normally ON
Switching Ratio
1/1000
Level
C-MOS (High level: +3.5 V to +5.0 V)
Input Impedance
Gate Width (FWHM)
1
50 µs to ∞
Repetition Rate Max.
10
Pulse-pair Resolution
35
Output Pulse Width
30
Min.
2.0
Output Pulse Height *3
Typ.
2.2
Recommended Load Resistance
50
Signal Output Logic
Positive logic
Operating Ambient Temperature *4
+5 to +40
Storage Temperature *4
-20 to +50
Weight
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) *4: No condensation
56
(at +25 °C)
Unit
V
V
mA
mm
nm
s-1·pW-1
s-1
s-1
—
—
—
kΩ
—
kHz
ns
ns
V
Ω
—
°C
°C
g
 ▷