GENERAL

Parameter

Description/Value

Unit

Spectral Response

Wavelength of Maximum Response

Photocathode

Window Material

Dynode

Base

Weight

Suitable Socket

nm

nm

—

mm

—

—

—

—

g

—

300 to 650

420

Bialkali

8

× 8

Borosilicate glass

Linear focused

8

11-pin glass base

Approx. 4.5

E678-11N (supplied)

Material

Minimum Useful Area

Structure

Number of Stages

PHOTOMULTIPLIER TUBE

R2248

MAXIMUM RATINGS (Absolute Maximum Values)

Information furnished by HA MAM ATS 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.

Subject to local technical requirements and regulations, availability of products included in this promotional material may var y. Please consult with our sales office.

10mm

× 10mm Square Envelope, Head-On Type

8-Stage, Bialkali Photocathode

CHARACTERISTICS (at 25

°C)

Parameter

Min.

Unit

Parameter

Value

Unit

Supply Voltage

Average Anode Current

Ambient Temperature

1500

250

0.03

-80 to +50

Vdc

Vdc

mA

°C

Between Anode and Cathode

Between Anode and Last Dynode

Cathode Sensitivity

Anode Sensitivity

Gain

Anode Dark Current (after 30min. storage in darkness)

Time Response

Luminous (2856K)

Radiant at 420nm

Blue (CS 5-58 filter)

Luminous (2856K)

Anode Pulse Rise Time

Electron Transit Time

60

—

—

30

—

—

—

95

76

9.5

100

1.1

1

0.9

9

µA/lm

mA/W

µA/lm-b

A/lm

—

nA

ns

ns

—

—

—

—

—

50

—

—

Typ.

Max.

Supply Voltage: 1250Vdc, K: Cathode, Dy: Dynode, P: Anode

VOLTAGE DISTRIBUTION RATIO AND SUPPLY VOLTAGE

Electrodes

Ratio

K

Dy1

2

Dy2

2

Dy3

1

Dy4

1

Dy5

1

Dy6

1

Dy7

1

Dy8

1

P

1