R2693 查看數據表（PDF） - Hamamatsu Photonics

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R2693

PHOTOMULTlPLlER TUBES

Hamamatsu Photonics 

PHOTOMULTIPLIER TUBES R2693, R2693P

MAXIMUM RATINGS (Absolute Maximum Values)

Parameter

Value

Unit

Supply Voltage

Between Anode and Cathode

Between Anode and Last Dynode

1250

250

V

V

Average Anode Current A

0.1

mA

CHARACTERISTlCS (at 25 °C)

Parameter

Cathode Sensitivity

Anode Sensitivity

Gain D

Quantum Efficiency at 375 nm

Luminous B

Radiant at 375 nm (Peak)

Blue Sensitivity Index C

Luminous D

Radiant at 375 nm (Peak)

Anode Dark Current E (After 30 min Storage in Darkness)

Anode Dark Counts

Pulse Hight Distribution F

at Plateau Voltage G

ENI (Equivalent Noise Input) H

Anode Pulse Rise Time J

Time Response D

Electron Transit Time K

Transit Time Spread (FWHM) L

Anode Current Stability M Current Hysteresis

Voltage Hysteresis

R2693

for General Purpose

Min. Typ. Max.

—

20.5

—

30

50

—

—

62

—

—

7.0

—

100

300

—

— 3.7 × 105 —

—

6 × 106

—

—

0.5

5.0

—

—

—

—

—

—

— 8.6 × 10-17 —

—

1.2

—

—

18

—

—

1.0

—

—

0.5

—

—

1.0

—

R2693P

for Photon Counting

Min. Typ. Max.

—

20.5

—

30

50

—

—

62

—

—

7.0

—

100

300

—

— 3.7 × 105 —

—

6 × 106

—

—

0.1

2.0

—

20

50

—

10

50

— 3.9 × 10-17 —

—

1.2

—

—

18

—

—

1.0

—

—

0.5

—

—

1.0

—

Unit

%

µA/lm

mA/W

µA/lm-b

A/lm

A/W

—

nA

s-1

s-1

W

ns

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 V

between the cathode and all other electrodes connected together

as anode.

C: 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.

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

voltage distribution ratio shown in Table 1 below.

Table 1: Voltage Distribution Ratio

Electrodes K Dy1 Dy2 Dy3 • • • • Dy7 Dy8 Dy9 P

Ratio

1

1

1

1 •••••

1

1

1

SuppIy Voltage: 1000 V, K: Cathode, Dy: Dynode, P: Anode

Pulse Height Distribution

Electrodes K Dy1 Dy2 Dy3 • • • • Dy7 Dy8 Dy9 P

Ratio

1

1

1

1 •••••

1

1

1

SuppIy Voltage: Note F, K: Cathode, Dy: Dynode, P: Anode

Plateau

Electrodes K Dy1 Dy2 Dy3 • • • • Dy7 Dy8 Dy9 P

Ratio

1

1

1

1 •••••

1

2

1

SuppIy Voltage: Plateau Voltage, K: Cathode, Dy: Dynode, P: Anode

E: Measured with the same supply voltage and voltage distribution

ratio as Note D after removal of light.

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

G: Plateau voltage at the test up in HPK

H: 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.

ENI = 2q.ldb.G.∆f

S

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

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

wavelength of peak response.

J: 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.

K: 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 amplitube. In

measurement, the whole photocathode is illuminated.

L: Also called transit time jitter. This is the fluctuation in electron

transit time between individual pulses in the single photoelectron

mode, and may be defined as the FWHM of the frequency

distribution of electron transit times.

M: Hysteresis is temporary instability in anode current after light and

voltage are applied.

Hysteresis =

lmax. lmin. × 100 (%)

li

li

l max.

l min.

TIME

0

5

6

7 (minutes)

TPMSB0002EA

(1)Current Hysteresis

The tube is operated at 750 V with an anode current of 1 µA for 5 minutes.

The light is then removed from the tube for a minute. The tube is then

re-illuminated by the previous light level for a minute to measure the variation.

(2)Voltage Hysteresis

The tube is operated at 300 V with an anode current of 0.1 µA for 5 minutes.

The light is then removed from the tube and the supply voltage is quickly

increased to 800 V. After a minute, the supply voltage is then reduced to the

previous value and the tube is re-illuminated for a minute to measure the variation.

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