GENERAL

Parameter

Description/Value

Unit

Spectral Response

Wavelength of Maximum Response

Photocathode

Window Material

Dynode

Base

Suitable Socket

nm

nm

—

mm dia.

—

—

—

—

—

160 to 320

240

Cs-Te

15

Fused silica

Linear focused

10

12-pin glass base

E678-12L (supplied)

Material

Minimum Effective Area

Structure

Number of Stages

PHOTOMULTIPLIER TUBE

R821

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.

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

Parameter

Min.

Unit

Parameter

Value

Unit

Supply Voltage

Average Anode Current

Ambient Temperature

1250

250

0.01

-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

Electrodes

Ratio

K

Dy1

1.5

Dy2

1

Dy3

1

Dy4

1

Dy5

1

Dy6

1

Dy7

1

Dy8

1

Dy9

11

1

Dy10

P

Radiant at 254nm

Radiant at 254nm

Anode Pulse Rise Time

Electron Transit Time

—

4

—

—

—

—

28

1.0

3.6

0.3

2.5

27

mA/W

A/W

—

nA

ns

ns

—

—

—

0.5

—

—

Typ.

Max.

NOTE: Anode characteristics are measured with the voltage distribution ratio shown below.