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Details, datasheet, quote on part number:R928
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| Part: | R928 |
| Category: | Optoelectronics => Photosensors => Photomultipliers => Photomultiplier Tubes |
| Description: | |
| Company: | Hamamatsu Photonic Systems |
| Datasheet: | Download R928 datasheet File size : 82 kB |
| Request For quote: | Find where to buy R928
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Datasheet text preview:
PHOTOMULTlPLlER TUBES
R928, R955
Extended Red, High Sensitivity, Multialkali Photocathode 28mm (1-1/8 Inch) Diameter, 9-Stage, Side-On
FEATURES
Wide Spectral Response R928 ........ 185 to 900 nm R955 ........ 160 to 900 nm High Cathode Sensitivity Luminous ...... 250 A/lm Radiant at 400nm ............ 74mA/W High Anode Sensitivity (at 1000V) Luminous ........ 2500A/lm Radiant at 400nm .... 7.4 105 A/W Low Drift and Hysteresis The R928 and R955 feature extremely high quantum efficiency, high current amplification, good S/N ratio and wide spectral response from UV to near infrared. The R928 employs a UV glass envelope and the R955 has a fused silica envelope for UV sensitivity extension. The R928 and R955 are well suited for use in broad-band spectrophotometers, atomic absorption spectrophotometers, emiss i o n spectrophotometers and other precision photometric instruments.
GENERAL
Parameter
Spectral Response R928 R955 Wavelength of Maximum Response Photocathode MateriaI Minimum Effective Area Window Material R928 R955 Dynode Secondary Emitting Surface Structure Number of Stages Direct Interelectrode Capacitances Anode to Last Dynode Anode to All Other Electrodes Base Weight SuitabIe Socket SuitabIe Socket Assembly Multialkali Circular-cage 9 Approx. 4 Approx. 6 11-pin base JEDEC No. B11-88 Approx. 45 E67811A (option) E71721 (option) pF pF
Figure 1: Typical Spectral Response
Description/Value Unit
100
TPMSB0001EB
185 to 900 160 to 900 400 Multialkali 8 24 UV glass Fused silica
nm nm nm
CATHODE RADIANT SENSITIVITY (mA/W) QUANTUM EFFICIENCY (%) 10
R955
CATHODE RADIANT SENSITIVITY
R928
mm
QUANTUM EFFICIENCY
1
0.1
0.01 100 200
300 400
500 600
700 800
900 1000
g
WAVELENGTH (nm)
S u b j e c t to local technical requirements and regulations, availability of products included in this promotional material may vary. Please consult with our sales office. l n f o r m a t i o n furnished by HAMAMATS U is believed to be reliabIe. However, no responsibility is assumed for possibIe inaccuracies or ommissions. Specifications are subject to change without notice. No patent right are granted to any of the circuits described herein. © 1997 Hamamatsu Photonics K.K.
PHOTO M U LTlPLlER TUBES R928, R955
MAXIMUM RATINGS (Absolute Maximum Values)
Parameter
Supply Voltage Between Anode and Cathode Between Anode and Last Dynode Average Anode Current Ambient Temperature 1250 250 0.1 80 to +50 Vdc Vdc mA
Value
Unit
CHARACTERISTlCS (at 25
Parameter
)
Min. R928 Typ.
25.4 (at 260nm) 250 18 52 74 41 3.5 0.3 8 2500 1.8 105 5.2 105 7.4 105 4.1 105 3.5 104 1.0 3 1.3 10-16 2.2 22 1.2 0.1 1.0 107 50 1.3
Max.
Min.
R955 Typ.
29.0 (at 220nm) 250 43 56 74 41 3.5 0.3 8 2500 4.3 105 5.6 105 7.4 105 4.1 105 3.5 104 1.0 3 10-16 2.2 22 1.2 0.1 1.0 107
Max.
Unit
% A/lm mA/W mA/W mA/W mA/W mA/W A/lm-b A/lm A/W A/W A/W A/W A/W
Cathode Sensitivity Quantum Efficiency at Peak Wavelength Luminous B Radiant at 194nm 254nm 400nm 633nm 852nm Red/White Ratio C Blue D Anode Sensitivity Luminous E Radiant at 194nm 254nm 400nm 633nm 852nm Gain E Anode Dark Current F After 30 minute Storage in the darkness ENI(Equivalent Noise Input) H Time Response E Anode Pulse Rise Time I Electron Transit Time J Transit Time Spread (TTS) K Anode Current Stability Current Hysteresis Voltage Hysteresis
L
140
140
0.2
0.2
400
400
50
nA W ns ns ns % %
NOTES
A: Averaged over any interval of 30 seconds maximum. B: The light source is a tungsten filament lamp operated at a distribution temperature of 2856K. Supply voltage is 100 volts between the cathode and all other electrodes connected together as anode. C: Red/White ratio is the quotient of the cathode current measured using a red filter(Toshiba R-68) interposed between the light source and the tube by the cathode current measured with the filter removed under the same conditions as Note B. D: The value is cathode output current when a blue filter(Corning CS-5-58 polished to 1/2 stock thickness) is interposed between the light source and the tube under the same condition as Note B. E: Measured with the same light source as Note B and with the voltage distribution ratio shown in Table 1 below. Table 1:Voltage Distribution Ratio
Electrode Distribution Ratio K 1 Dy1 Dy2 Dy3 Dy4 Dy5 Dy6 Dy7 Dy8 Dy9 1 1 1 1 1 1 1 1 1 P
F: Measured with the same supply voltage and voltage distribution ratio as Note E after removal of light. G:Measured at a supply voltage adjusted to provide an anode sensitivity of 100 A/lm. H: ENI is an indication of the photon-limited signal-to-noise ratio. It refers to the amount of light in watts to produce a signal-to-noise ratio of unity in the output of a photomultiplier tube. ENI = where 2q.ldb.G. f S q = Electronic charge (1.60 10-19 coulomb). ldb = Anode dark current(after 30 minute storage) in amperes. G = Gain. f = Bandwidth of the system in hertz. 1 hertz is used. S = Anode radiant sensitivity in amperes per watt at the wavelength of peak response. I: The rise time is the time for the output pulse to rise from 10% to 90% of the peak amplitude when the entire photocathode is illuminated by a delta function light pulse.
SuppIy Voltage : 1000Vdc K : Cathode, Dy : Dynode,
P : Anode
J: The electron transit time is the interval between the arrival of delta function light pulse at the entrance window of the tube and the time when the anode output reaches the peak amplitude. In measurement, the whole photocathode is illuminated. K: Also called transit time jitter. This is the fluctuation in electron transit time between individual pulses in the signal photoelectron mode, and may be defined as the FWHM of the frequency distribution of electron transit times. L: Hysteresis is temporary instability in anode current after light and voltage are applied.
Hysteresis =
lmax. li
lmin.
100(%)
(1)Current Hysteresis The tube is operated at 750 volts with an anode current of 1 micro-ampere for 5 minutes. The light is then removed from the tube for a minute. The tube is then re-illuminated by the previous light level for a minute to measure the variation. (2)Voltage Hysteresis The tube is operated at 300 volts with an anode current of 0.1 micro-ampere for 5 minutes. The light is then removed from the tube and the supply voltage is quickly increased to 800 volts. After a minute, the supply voltage is then reduced to the previous value and the tube is re-illuminated for a minute to measure the variation.
ANODE CURRENT
li
l max. l min. TIME
0
5
6
7 (minutes)
TPMSB0002EA
Figure 2: Anode Luminous Sensitivity and Gain Characteristics
104
TPMSB0003EB
F i g u r e 3: Typical Time Response
100 80 60
TPMSB0004EB
108
ANODE LUMINOUS SENSITIVITY (A/lm)
NS
103
IT
IV
IT
Y
107
Y
40
IV
TRAN
SE
IT
E
OD
AN
L
IN
CA
GA
E
SE
102
NS
IT
SIT T
IME
106
20
TY
101
105
TIME (ns)
OD
GAIN
PI
L
CA
AN
PI
UM
10 8 6
TY
100
M
IN
IM
104
4
RISE
TIME
101
103
2
102 200
300
500
700
1000
102 1500
1
300
500
700
1000
1500
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
Figure 4: Typical Temperature Coefficient of Anode Sensitivity
TPMSB0005EA
F i g u r e 5: Typical Temperature Characteristic of Dark Current (at 1000V, after 30minute storage)
TPMSB0006EA
160
100
800nm
140
600nm
10
120
400nm
100
80
ANODE DARK CURRENT (nA)
ANODE SENSITIVITY (%)
1
60
40
0.1
20
0
40 20
0.01
0 +20 +40 TEMPERATURE (°C)
40
20
0
+20
+40
TEMPERATURE (°C)
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