HAMAMATSU H7421-50, H7421-40 Datasheet
Metal package PMT with Cooler
Photon Counting Head H7421 Series
The H7421 series are photon counting head devices containing a metal
package photomultiplier tube having a GaAsP/GaAs photocathode and a
thermoelectric cooler. The thermoelectric cooler reduces thermal noise generated from the photocathode which also offers a high quantum efficiency, allowing measurement to be made with a good S/N ratio even at very low light
levels.
The H7421-40 has high sensitivity on wavelength from 300 nm to 720 nm.
The H7421-50 is sensitive over a wide spectral range from 380 nm to 890 nm.
The photomultiplier tube is maintained at a constant temperature by monitoring the output from a thermistor installed near the photomultiplier tube and
regulating the current to the thermoelectric cooler.
Heatsink with fan (A7423) sold separately
Product Variations
Type No.
H7421-40
H7421-50
Spectral Response
300 nm to 720 nm
380 nm to 890 nm
GaAsP photocathode, QE 40 % at peak wavelength
GaAs photocathode, QE 12 % at peak wavelength
Features
Specifications
Parameter
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
Effective Area
Peak Sensitivity Wavelength
Count Sensitivity
Count Linearity *
Dark Count *2 *
1
3
Ty p.
Max.
Pulse-pair Resolution
Output Pulse Width
Ty p.
Output Pulse Height *
4
Min.
Recommended Load Resistance
Signal Output Logic
Operating Ambient Temperature
Storage Temperature
Weight
*1: Random pulse, at 10 % count loss
*2: PMT setting temperature 0 °C, used with C8137, M9011 and A7432
*3: After 30 minute storage in darkness
*4: With input voltage +5 V, Load resistance 50 Ω and Coaxial cable RG-174/U (450 mm)
H7421-40
580
7.8 × 10
1.5 × 10
100
300
+4.5 to +5.5
5
6
Positive logic
+5 to +35
-20 to +50
+6
50
2.6
2.2
5
70
30
3.6
3.0
50
340
H7421-50
800
3.9 × 10
1.5 × 10
125
375
Unit
V
V
mA
V
A
mm
nm
5
6
-1
-1
s
·pW
-1
s
-1
s
ns
ns
V
Ω
—
°C
°C
g
Cooling Specifications
Parameter
Cooling Method
Max. Cooling Temperature (∆T) *
Cooling Time *
*5: Input current to thermoelectric cooler = 2.0 A
5
40
5
H7421-40/H7421-50 Unit
Thermoelectric cooling
35
Approx. 5
—
°C
min
Characteristics (Count sensitivity, Dark count)
TPHOB0042ED TPHOB0046EB
6
10
)
-1
5
10
·pW
-1
4
10
3
10
COUNT SENSITIVITY (s
2
10
300 400 500 600
WAVELENGTH (nm)
H7421-40
H7421-50
700 800 900 1000
)
-1
DARK COUNT (s
Photon Counting Heads
1000
100
H7421-40 (when used wih C8137, A7423)
10
510
15 20 25
AMBIENT TEMPERATURE (°C)
H7421-50 (when used
with C8137, A7423)
30 35 40 45
Block Diagram
POWER INPUT for
THERMOELECTRIC
COOLER
THERMOELECTRIC
COOLER
THERMISTOR
PMT
HV POWER SUPPLY
VOLTAGE DIVIDER
CIRCUIT
AMP
GND
COMPARATOR
+
–
LLD.
+5 V
Dimensional Outlines
8-M3 DEPTH: 2
22.2 ± 0.2
53.6 ± 0.225.4 ± 0.2
O-RING GROOVE
(S-28 O-RING INCLUDED)
4-M2 DEPTH: 2
9.5 ± 0.1
44.0 ± 0.2
56.0 ± 0.3
M25.4 P = 1/32"
C-MOUNT
4-M3B
20.0 ± 0.2
36.0 ± 0.3
18.5 ± 0.2
PHOTOCATHODE 5
20.0 ± 0.2
16.3 ± 0.2
19.0 ± 0.2
TOP VIEW
8-M3CA
25.0 ± 0.2
104 ± 1
SIDE VIEWFRONT VIEW
PULSE
SHAPER
(Unit: mm)
POWER INPUT
TAJIMI PRC03-23A10-7M
SIGNAL OUTPUT
BNC-R
OUTPUT
POSITIVE
LOGIC
RL = 50 Ω
ACROSS SECTION
WINDOW
10.2
C-MOUNT
M25.4 P=1/32"
4.0 ± 0.1
6.4 ± 0.2
15.0 ± 0.2 26.0 ± 0.2
TAJIMI PRC03-23A10-7M
7.4 ± 0.2
CROSS SECTIONCCROSS SECTION
B
6.5 ± 0.2
M3
DEPTH: 4.0 Max.
FA
G
EB
D
TO
PULSE COUNTER
TPHOC0042ED
PHOTOCATHODE
5
7.2
GUIDE MARK
C
PMT
14.8 ± 0.2
16.3 ± 0.2
2.0
± 0.2
M3
DEPTH: 4.0 Max.
A: THERMISTOR 1
B: THERMISTOR 2
C: THERMOELECTRIC COOLER +
D: THERMOELECTRIC COOLER –
E: Vcc LOW VOLTAGE
INPUT(+5 V)
F: IC*
G: GND
*IC: Internal Connection (Do not use)
TPHOA0021EC
41
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