R8486 데이터 시트보기 (PDF) - Hamamatsu Photonics
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R8486 Datasheet PDF : 4 Pages
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PHOTOMULTIPLIER TUBES R8486, R8487
MAXIMUM RATINGS (Absolute Maximum Values)
Parameter
Supply Voltage
Between Anode and Cathode
Between Anode and Last Dynode
Between Successive Dynodes
Between First Dynode and Cathode
Average Anode Current A
Ambient Temperature
Rating
1250
250
250
250
0.1
-30 to +50
Unit
V dc
V dc
V dc
V dc
V dc
°C
CHARACTERISTICS (at 25 °C)
Parameter
Cathode Sensitivity
Quantum Efficiency at 121 nm
at 254 nm
Anode Sensitivity B
Radiant at 121 nm
at 254 nm
Gain
Anode Dark Current (After 30 minute storage in darkness) C
ENI (Equivalent Noise Input) D at 121 nm
at 254 nm
Time Response
Anode Pulse Rise Time E
Electron Transit Time F
Transit Time Spread G
R8486
22.5
25.0
—
5.2 × 105
1.0 × 107
1.0
—
1.09 × 10-16
2.2
22
1.2
R8487
26.0
—
1.0 × 105
—
3.9 × 106
0.1
1.12 × 10-16
—
2.2
22
1.2
Unit
%
%
A/W
A/W
—
nA
W
W
ns
ns
ns
NOTES
A: Averaged over any interval of 30 seconds maximum.
B: 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 K Dy1 Dy2 Dy3 Dy4 Dy5 Dy6 Dy7 Dy8 Dy9 P
Distribution
Ratio
1111111111
Supply Voltage=1000 V dc
K: Cathode Dy: Dynode P: Anode
C: Measured with the same supply voltage and voltage distribution ratio
as Note E after removal of light.
D: 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 uni-
ty in the output of a photomultiplier tube.
ENI = 2q·ldb·G·∆f
s
where q = Electronic charge (1.60 × 10-19 coulomb).
ldb = Anode dark current(after 30 minutes 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.
E: 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.
F: The electron transit time is the interval between the arrival of delta func-
tion 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.
G: 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.
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