
GENERAL
Parameter
Description/Value
160 to 320
240
Cs-Te
15
Fused silica
Linear focused
10
12-pin glass base
E678-12L (supplied)
Unit
nm
nm
—
mm dia.
—
—
—
—
—
Spectral Response
Wavelength of Maximum Response
Photocathode
Window Material
Dynode
Base
Suitable Socket
Material
Minimum Effective Area
Structure
Number of Stages
PHOTOMULTIPLIER TUBE
R821
MAXIMUM RATINGS (Absolute Maximum Values)
Parameter
Between Anode and Cathode
Between Anode and Last Dynode
Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications are
subject to change without notice. No patent rights are granted to any of the circuits described herein.
1998 Hamamatsu Photonics K.K.
Subject to local technical requirements and regulations, availability of products included in this promotional material may vary. Please consult with our sales office.
Supply Voltage: 1000Vdc, K: Cathode, Dy: Dynode, P: Anode
For Astro-physics and Other Ultraviolet Radiation Detection
Solar Blind Response (160nm to 320nm), Cs-Te Photocathode
19mm (3/4 Inch) Diameter, 10-stage, Head-On
CHARACTERISTICS (at 25
°
C)
VOLTAGE DISTRIBUTION RATIO AND SUPPLY VOLTAGE
Electrodes
Ratio
1.5
1
1
Parameter
Radiant at 254nm
Radiant at 254nm
Min.
—
4
×
10
3
—
—
—
—
Unit
mA/W
A/W
—
nA
ns
ns
Value
1250
250
0.01
-80 to +50
Unit
Vdc
Vdc
mA
°
C
Supply Voltage
Average Anode Current
Ambient Temperature
Cathode Sensitivity
Anode Sensitivity
Gain
Anode Dark Current (after 30min. storage in darkness)
Time Response
K
Dy1
Dy2
Dy3
Dy4
1
Dy5
1
Dy6
1
Dy7
1
Dy8
1
Dy9
1
1
1
Dy10
P
Anode Pulse Rise Time
Electron Transit Time
28
1.0
×
10
4
3.6
×
10
5
0.3
2.5
27
—
—
—
0.5
—
—
Typ.
Max.
NOTE:
Anode characteristics are measured with the voltage distribution ratio shown below.