PHOTOMULTIPLIER TUBE
R2248
10mm
×
10mm Square Envelope, Head-On Type
8-Stage, Bialkali Photocathode
GENERAL
Parameter
Spectral Response
Wavelength of Maximum Response
Material
Photocathode
Minimum Useful Area
Window Material
Structure
Dynode
Number of Stages
Base
Weight
Suitable Socket
Description/Value
300 to 650
420
Bialkali
8
×
8
Borosilicate glass
Linear focused
8
11-pin glass base
Approx. 4.5
E678-11N (supplied)
Unit
nm
nm
—
mm
—
—
—
—
g
—
MAXIMUM RATINGS (Absolute Maximum Values)
Supply Voltage
Average Anode Current
Ambient Temperature
Parameter
Between Anode and Cathode
Between Anode and Last Dynode
Value
1500
250
0.03
-80 to +50
Unit
Vdc
Vdc
mA
°C
CHARACTERISTICS (at 25°C)
Cathode Sensitivity
Parameter
Luminous (2856K)
Radiant at 420nm
Blue (CS 5-58 filter)
Luminous (2856K)
Min.
60
—
—
30
—
—
—
Typ.
95
76
9.5
100
1.1
×
10
6
1
0.9
9
Max.
—
—
—
—
—
50
—
—
Unit
µA/lm
mA/W
µA/lm-b
A/lm
—
nA
ns
ns
Anode Sensitivity
Gain
Anode Dark Current (after 30min. storage in darkness)
Anode Pulse Rise Time
Time Response
Electron Transit Time
VOLTAGE DISTRIBUTION RATIO AND SUPPLY VOLTAGE
Electrodes
K
Dy1 Dy2 Dy3 Dy4 Dy5 Dy6 Dy7 Dy8
P
Ratio
2
2
1
1
1
1
1
1
1
Supply Voltage: 1250Vdc, K: Cathode, Dy: Dynode, P: Anode
Subject to local technical requirements and regulations, availability of products included in this promotional material may vary. Please consult with our sales office.
Information furnished by HAMAMATS U 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.
HAMAMATSU [ HAMAMATSU CORPORATION ]
