r8486 Hamamatsu Photonics, K.K.,, r8486 Datasheet - Page 2

• Manufacturer Part Number: r8486
• Description: Photomultiplier Tubes
• Manufacturer: Hamamatsu Photonics, K.K.,

A: Averaged over any interval of 30 seconds maximum.
B: Measured with the voltage distribution ratio shown in Table 1 below.
Table 1: Voltage Distribution Ratio
Supply Voltage=1000 V
K: Cathode
C: ENI is an indication of the photon-limited signal-to-noise ratio. It refers
MAXIMUM RATINGS (Absolute Maximum Values)
CHARACTERISTICS (at 25 °C)
NOTES
Supply Voltage
Average Anode Current
Electrode
Distribution
Ratio
where
Cathode Sensitivity
Anode Sensitivity
Gain
Anode Dark Current (After 30 minute storage in darkness)
ENI (Equivalent Noise Input)
Time Response
to the amount of light in watts to produce a signal-to-noise ratio of uni-
ty in the output of a photomultiplier tube.
PHOTOMULTIPLIER TUBES R8486, R8487
Between Anode and Cathode
Between Anode and Last Dynode
Between Successive Dynodes
Between First Dynode and Cathode
Quantum Efficiency at 122 nm
Radiant at 122 nm
Anode Pulse Rise Time
Electron Transit Time
Transit Time Spread
ENI =
ldb =
∆f =
S =
q =
g =
Parameter
at 254 nm
Dy: Dynode
Electronic charge (1.60 × 10
Anode dark current in amperes after 30 minutes storage in darkness.
Gain.
Bandwidth of the system in hertz.
Anode radiant sensitivity in amperes per watt at the
wavelength of interest.
K Dy1 Dy2 Dy3 Dy4 Dy5 Dy6 Dy7 Dy8 Dy9 P
2q·ldb·g·∆f
1
B
S
Parameter
1
A
at 254 nm
F
E
1
P: Anode
D
C
1
at 122 nm
at 254 nm
1
-19
1
coulomb).
1
Rating
1250
250
250
250
0.1
1
1
B
1
Unit
mA
V
V
V
V
1.09 × 10
5.2 × 10
1.0 × 10
R8486
D: The rise time is the time for the output pulse to rise from 10 % to 90 %
E: The electron transit time is the interval between the arrival of delta
F: Also called transit time jitter. This is the fluctuation in electron transit
22.5
25.0
1.0
2.2
1.2
22
—
—
of the peak amplitude when the entire photocathode is illuminated by a
delta function light pulse.
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.
time between individual pulses in the signal photoelectron mode, and
may be defined as the FWHM of the frequency distribution of electron
transit times.
-16
5
7
1.12 × 10
1.0 × 10
3.9 × 10
R8487
26.0
0.1
2.2
1.2
22
—
—
—
-16
5
6
Unit
A/W
A/W
nA
—
W
W
ns
ns
ns
%
%