HAMAMATSU R6925 Datasheet
High Sensitivity Bialkali Photocathode
28mm (1-1/8 Inch) Diameter, 9-Stage, Side-On Type
FEATURES
Spectral Response ............................ 185 to 730 nm
Cathode Sensitivity
Luminous........................................70 µA/lm Typ.
Radiant at 410 nm .......................... 68mA/W Typ.
Anode Sensitivity (at 1000V)
Luminous.........................................500A/lm Typ.
Radiant at 410 nm ................... 4.8 × 105A/W Typ.
APPLICATIONS
Fluorescence Spectrophotometers
Emission Spectrophotometers
Atomic Absorption Spectrophotometers
PHOTOMULTIPLIER TUBE
R6925
TPMSF0073
GENERAL
Parameter
Spectral Response 185 to 730 nm
Wavelength of Maximum Response 410 nm
Photocathode
Material Bialkali —
Minimum Effective Area 8 × 24 mm
Window Material UV glass
Dynode
Secondary Emitting Surface Bialkali —
Structure Circular-cage —
Number of Stages 9 —
Direct Interelectrode Capacitances
Anode to Last Dynode 4 pF
Anode to All Other Electrodes 6 pF
Base 11-pin base
Weight 45 g
Suitable Socket E678-11A(option) —
Suitable Socket Assembly E717-21(option) —
Description/Value
JEDEC No.B11-88
Unit
Figure 1: Typical Spectral Response
TPMSB0123EA
100
10
QUANTUM EFFICIENCY
1
CATHODE RADIANT
SENSITIVITY
QUANTUM EFFICIENCY (%)
0.1
CATHODE RADIANT SENSITIVITY (mA/W)
0.01
100 300200 400 500 600 700 800
WAVELENGTH (nm)
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subject to change without notice. No patent rights are granted to any of the circuits described herein. ©1997 Hamamatsu Photonics K.K
PHOTOMULTIPLIER TUBE R6925
MAXIMUM RATINGS (Absolute Maximum Values)
Parameter
Rating
Supply Voltage
Between Anode and Cathode Vdc
Between Anode and Last Dynode Vdc
Average Anode Current
A
1250
250
0.1
CHARACTERISTICS (at 25°C)
Parameter
Cathode sensitivity
Quantum Efficiency at Peak Wavelength
Luminous
Radiant at 410nm
Red/White Ratio
Blue
Anode Sensitivity
Luminous
Radiant at 410nm
Gain
Anode Dark Current
ENI (Equivalent Noise Input)
Time Response
Anode Pulse Rise Time
Electron Transit Time
Transit Time Spread (TTS)
Anode Current Stability
Light Hysteresis
Voltage Hysteresis
B
D
C
E
F
(After 30 minutes storage in the darkness)
G
E
H
I
J
K
Unit
mA
Min.
—
40
—
—
—
200
—
—
—
—
—
—
—
—
—
Max.Typ.
23
(at 250nm)
70
68
0.02
7
500
5
4.8 × 10
6
7.1 × 10
550
-16
2.2 × 10
2.2
22
1.2
0.1
1.0
Unit
—
—
—
—
—
—
—
—
%
µ A/lm
mA/W
—
µ A/lm-blue
A/lm
A/W
—
nA
—
—
—
—
—
—
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 2856K. 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 us-
ing 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.
D: 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.
E: 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
Electrode
Distribution
Ratio
Supply Voltage=1000Vdc
K:Cathode Dy:Dynode P:Anode
K Dy1 Dy2 Dy3 Dy4 Dy5 Dy6 Dy7 Dy8 Dy9 P
1111111111
F: Measured with the same supply voltage and voltage distribution ratio
as Note E after removal of light.
G: ENI is an indication of the photon-limited signal-to-noise ratio. It re-
fers to the amount of light in watts to produce a signal-to-noise ratio
of unity in the output of a photomultiplier tube.
ENI =
where q = Electronic charge (1.60 × 10
2q·ldb·G·∆f
S
-19
coulomb).
ldb = Anode dark current(after 30 minutes storage) in am-
peres.
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 photocathode is illuminated by
a delta function light pulse.
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