
18
Specifications
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
μ
A 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.
Metal Package PMT with Cooler
Photosensor Modules H7422 Series
Heatsink with fan (A7423) sold separately
Product Variations
*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 M
,
Load capacitance = 22 pF
*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.
Type No.
H7422-40
H7422P-40
H7422-50
H7422P-50
H7422-01
H7422-02
H7422-20
300 nm to 720 nm
380 nm to 890 nm
300 nm to 850 nm
300 nm to 870 nm
300 nm to 890 nm
2
μ
A
100
μ
A
GaAsP photocathode, QE 40 % at peak
wavelength, high gain (P type)
GaAs photocathode, QE 12 % at peak
wavelength, high gain (P type)
Multialkali photocathode
Infrared-extended multialkali photocathode
Infrared-extended high-sensitivity multialkali photocathode
For photon counting
For photon counting
Spectral Response
Max. Output Signal Current
Features
Parameter
H7422
Series
-01
+11.5 to +15.5
+18
Suffix
Input Voltage
Max. Input Voltage for Main Unit
Max. Input Current
for Main Unit
Max. Input Voltage for Thermoelectric Cooler
Max. Input Current for Thermoelectric Cooler
Max. Output Signal Current
Max. Control Voltage
Recommended Control Voltage Adjustment Range
Effective Area
Sensitivity Adjustment Range
Peak Sensitivity Wavelength
C
Rise Time *
1
Ripple Noise *
1
*
4
(peak to peak)
Settling Time *
5
Operating Ambient Temperature
Storage Temperature
Weight
-40
580
108
176
—
8.8
×
10
4
0.4
1.0
1.8
×
10
5
100
300
-50
800
15
50
90
2.5
×
10
4
0.5
1.3
5.0
×
10
4
125
375
2.6
2.2
+0.9 (Input impedance 100 k
)
400
56
36
1.2
1.8
×
10
4
0.03
0.08
—
—
—
0.6
0.2
+5 to +35
-20 to +50
Approx. 400
-20
630
40
72
46
3.6
×
10
4
0.1
0.25
—
—
—
62
2
+0.5 to +0.8
5
1: 50
1.00
-02
30
100
+0.25 to +0.8
7
1: 10
4
500
40
56
6.4
2.8
×
10
4
0.08
0.2
—
—
—
0.78
Unit
—
V
V
mA
V
A
μ
A
V
V
mm
—
nm
mA/W
A/W
nA
A/W
s
-1
ns
mV
s
°
C
°
C
g
Radiant Sensitivity
Radiant Sensitivity *
1
Dark Current *
1
*
2
Radiant Sensitivity *
3
Dark Count *
2
*
3
420 nm
550 nm
800 nm
550 nm
Typ.
Max.
550 nm
Typ.
Max.
Max.
A
P
S