MAXIMUM RATINGS (Absolute Maximum Values)

Parameter

Value

Supply Voltage

Between Anode and Cathode

Between Anode and Last Dynode

1250

250

0.1

Vdc

Vdc

mA

Unit

CHARACTERISTlCS (at 25

)

NOTES

Parameter

Min.

Max.

R3788

Typ.

Cathode Sensitivity

(After 30minutes Storage in the darkness)

550

A:

B:

C:

D:

E:

Averaged over any interval of 30 seconds maximum.

The light source is a tungsten filament lamp operated at a distribution tem-

perature of 2856K. Supply voltage is 100 volts between the cathode and

all other electrodes connected together as anode.

Red/White ratio is the quotient of the cathode current measured using a

red filter(Toshiba R-68) interposed between the light source and the tube

by the cathode current measured with the filter removed under the same

conditions as Note B.

The value is cathode output current when a blue filter(Corning CS-5-58

polished to 1/2 stock thickness) is interposed between the light source and

the tube under the same condition as Note B.

Measured with the same light source as Note B and with the voltage distri-

bution ratio shown in Table 1 below.

F:

G:

H:

Measured with the same supply voltage and voltage distribution ratio as

Note E after removal of light.

ENI is an indication of the photon-limited signal-to-noise ratio. It refers to

the amount of light in watts to produce a signal-to-noise ratio of unity in the

output of a photomultiplier tube.

where

q = Electronic charge (1.60

ldb = Anode dark current(after 30 minutes storage) in amperes.

G = Gain.

f = Bandwidth of the system in hertz. 1 hertz is used.

S = Anode radiant sensitivity in amperes per watt at the wave-

length of peak response.

The rise time is the time for the output pulse to rise from 10% to 90% of the

peak amplitude when the entire photocathode is illuminated by a delta

function light pulse.

ENI =

S

2q.ldb.G. f

Light Hysteresis

Voltage Hysteresis

0.1

1.0

Radiant at 194nm

31

0.01

10

210nm

50

420nm

90

2.2

22

1.2

Electrodes

K

Dy1 Dy2 Dy3 Dy4 Dy5 Dy6 Dy7 Dy8 Dy9

P

Distribution

Ratio

1

111

1

1

1111

SuppIy Voltage : 1000Vdc

K : Cathode,

Dy : Dynode,

P : Anode

Quantum Efficiency at Peak Wavelength

100

120

30

(at 250nm)

Anode Sensitivity

Unit

PHOTOMULTlPLlER TUBES R3788, R4332

Radiant at 194nm

210nm

420nm

1200

500

5.0

9.0

1.0

1.4

Min.

Max.

R4332

Typ.

550

nA

0.1

1.0

%

%

60

mA/W

0.01

10

A/lm-b

68

mA/W

90

mA/W

2.2

22

1.2

ns

ns

ns

100

120

A/lm

40

(at 210nm)

%

6.0

A/W

1200

A/lm

500

6.8

A/W

9.0

A/W

1.0

1.4

W

Table 1:Voltage Distribution Ratio

3.1