H7422 Datasheet, PDF (1/4 Pages) Hamamatsu Corporation – Photosensor Modules

Metal Package PMT with Cooler
Photosensor Modules H7422 Series
Heatsink with fan (A7423) sold separately
The H7422 series are photosensor modules with an internal high-voltage power
supply circuit and a cooler installed to the metal package photomultiplier tube. Effi-
cient cooling was achieved by placing the cooler near the photomultiplier tube to
reduce thermal noise emitted from the photocathode and a high S/N ratio can be
obtained even at extremely low light levels.
The H7422-40 has high sensitivity in the 300 nm to 720 nm wavelengths. The
H7422-50 is sensitive along a wide spectral range from 380 nm to 890 nm. The
H7422-01, H7422-02 and H7422-20 have a maximum output current value of 100
µA and so are extremely effective when measurements are needed over a wide
dynamic range. The photomultiplier tube is maintained at a constant temperature
by monitoring the output from a thermistor installed near the photomultiplier and
then regulating the current to the thermoelectric cooler.
Product Variations
Type No.
H7422-40
H7422P-40
H7422-50
H7422P-50
H7422-01
H7422-02
H7422-20
Spectral Response Max. Output Signal Current
300 nm to 720 nm
380 nm to 890 nm
2 µA
300 nm to 850 nm
300 nm to 870 nm
300 nm to 890 nm
100 µA
Features
GaAsP photocathode, QE 40 % at peak
wavelength, high gain (P type)
For photon counting
GaAs photocathode, QE 12 % at peak
wavelength, high gain (P type)
For photon counting
Multialkali photocathode
Infrared-extended multialkali photocathode
Infrared-extended high-sensitivity multialkali photocathode
Specifications
Parameter
H7422 Series
Suffix
-40
-50
-01
-02
-20
Input Voltage
+11.5 to +15.5
Max. Input Voltage for Main Unit
+18
Max. Input Current for Main Unit
62
30
Max. Input Voltage for Thermoelectric Cooler
2.6
Max. Input Current for Thermoelectric Cooler
2.2
Max. Output Signal Current
2
100
Max. Control Voltage
+0.9 (Input impedance 100 kΩ)
Recommended Control Voltage Adjustment Range
+0.5 to +0.8
+0.25 to +0.8
Effective Area
5
7
Sensitivity Adjustment Range
1: 50
1: 10⁴
Peak Sensitivity Wavelength
580
800
400
500
630
420 nm
108
15
56
40
40
Radiant Sensitivity
550 nm
176
50
36
56
72
800 nm
—
90
1.2
6.4
46
Radiant Sensitivity *¹ 550 nm 8.8 × 10⁴
2.5 × 10⁴
1.8 × 10⁴
2.8 × 10⁴
3.6 × 10⁴
Dark Current *¹ *^{2 Typ.}
0.4
Max.
1.0
0.5
0.03
0.08
0.1
1.3
0.08
0.2
0.25
Radiant Sensitivity *³ 550 nm 1.8 × 10⁵
5.0 × 10⁴
—
—
—
Dark Count *² *³
Typ.
100
125
—
—
—
Max.
300
375
—
—
—
Rise Time *¹
1.00
0.78
Ripple Noise *¹ *⁴ (peak to peak) Max.
0.6
Settling Time *⁵
0.2
Operating Ambient Temperature
+5 to +35
Storage Temperature
-20 to +50
Weight
Approx. 400
*1: Control voltage = +0.8 V PMT setting temperature 0 °C, used with C8137-02 and A7432 *2: After 30 minute storage in darkness
*3: Plateau voltage, PMT setting temperature 0 °C, used with C8137-02 and A7423
*4: Cable RG-174/U, Cable length 450 mm, Load resistance = 1 MΩ, Load capacitance = 22 pF
18^{*5: The time required for the output to reach a stable level following a change in the control voltage from +1.0 V to +0.5 V.}
Unit
—
V
V
mA
V
A
µA
V
V
mm
—
nm
mA/W
A/W
nA
A/W
s^-1
ns
mV
s
°C
°C
g