R2658 查看數據表（PDF） - Hamamatsu Photonics

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R2658

PHOTOMULTIPLIER TUBES

Hamamatsu Photonics 

PHOTOMULTIPLIER TUBES

R2658, R2658P (For Photon Counting)

MAXIMUM RATINGS (Absolute Maximum Values)

Parameter

Value Unit

Between Anode and Cathode

Supply Voltage

Between Anode and Last Dynode

1500 Vdc

250

Vdc

Average Anode Current A

1

µA

Ambient Temperature

-30 to +50 °C

CHARACTERISTICS (at 25°C)

Parameter

Min.

Quantum at 330 nm —

Efficiency at 1000 nm 0.02

Luminous B

50

at 194 nm —

Cathode

at 254 nm —

Sensitivity

at 400 nm —

Radiant

at 633 nm —

at 852 nm —

at 1000 nm 0.16

Red / White Ratio C

0.25

Luminous D

5

at 194 nm —

Anode

Sensitivity

at 254 nm —

at 400 nm —

Radiant

at 633 nm —

at 852 nm —

at 1000 nm —

Gain D

—

Anode Dark Current E

—

Anode Dark Count (for the R2658P) F —

ENI (Equivalent Noise Input) G

—

Anode Pulse

Time

Rise Time H

—

Response D

Electron Transit Time J —

Anode Current Current Hysteresis

—

Stability K

Voltage Hysteresis

—

Typ.

14

0.13

100

20

23

40

19

7.6

1

0.4

16

3.2 × 103

3.7 × 103

6.4 × 103

3.0 × 103

1.2 × 103

1.6 × 102

1.6 × 105

1

50

1.1 × 10-15

2.0

20

2

2

Max.

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

10

300

—

—

—

—

—

Unit

%

%

µA/lm

mA/W

mA/W

mA/W

mA/W

mA/W

mA/W

—

A/lm

A/W

A/W

A/W

A/W

A/W

A/W

—

nA

s-1

W

ns

ns

%

%

NOTES

A: Averaged over any interval of 30 seconds maximum.

B: The light source is a tungsten filament lamp operated at

a distribution temperature of 2856 K. Supply voltage is

100 volts between the cathode and all other electrodes

connected together as anode.

C: 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

condition as Note B.

D: Measured with the same light source as Note B and

with the voltage distribution ratio shown in Table 1 below.

E: Measured with the same supply voltage and the voltage

distribution ratio as Note D after 30 minute storage in

the darkness.

F: Measured at the voltage producing the gain of 1 × 106

and the voltage distribution ratio shown in table 1 below.

The photocathode is cooled at -20 °C.

G: ENI is an indication of the photo-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.

ENI = 2q•ldb•G•∆f

S

where q = Electronic charge (1.60 × 10-19 coulomb)

ldb = Anode dark current (after 30 minute 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 wavelength of peak response.

H: The rise time is the time for the output pulse to rise from

10 % to 90 % of the peak amplitude when the entire pho-

tocathode is illuminated by a delta function light pulse.

J: The electron transit time is the interval between the

arrival of delta function light pulse at the entrance

window of the tube and the time when the anode output

reaches the peak amplitude. In measurement, the whole

photocathode is illuminated.

K: Hysteresis is temporary instability in anode current after

light and voltage are applied.

Table 1: Voltage Distribution Ratio

Electrodes K Dy1 Dy2 Dy3 Dy4 Dy5 Dy6 Dy7 Dy8 Dy9 P

Distribution

Ratio

1111111111

Supply Voltage= 1250 Vdc

K: Cathode, Dy: Dynode, P: Anode

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