
GENERAL
Parameter
Description/Value
300 to 650
375
High temp. bialkali
15
Borosilicate glass
Circular-cage
10
Unit
nm
nm
—
mm dia.
—
—
—
Spectral Response
Wavelength of Maximum Response
Photocathode
Window Material
Dynode
Material
Minimum Effective Area
Structure
Number of Stages
PHOTOMULTIPLIER TUBE
R3991
MAXIMUM RATINGS (Absolute Maximum Values)
Parameter
Between Anode and Cathode
Between Anode and Last Dynode
Information furnished by HAMAMATSU 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.
1999 Hamamatsu Photonics K.K.
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Ruggedized, High Temperature (175
°
C) PMT for Oil Well Logging (MWD)
19 mm (3/4 Inch) Diameter, 10-stage, Head-On Type
CHARACTERISTICS (at 25
°
C)
Parameter
Luminous (2856K)
Blue (CS-5-58 filter)
Luminous (2856K)
Min.
20
4
5
—
—
—
—
Unit
μ
A/lm
μ
A/lm-b
A/lm
—
nA
ns
ns
Value
1800
250
0.02
-80 to +175
Unit
Vdc
Vdc
mA
°
C
Supply Voltage
Average Anode Current
Ambient Temperature
Cathode Sensitivity
Anode Sensitivity
Gain
Anode Dark Current (after 30min. storage in darkness)
Time Response
Anode Pulse Rise Time
Electron Transit Time
40
6
15
3.75
×
10
5
0.1
*
1.0
13
—
—
—
—
10
—
—
Typ.
Max.
Supply Voltage: 1500Vdc, K: Cathode, Dy: Dynode, P: Anode
Shock
1000g's, 0.5ms, 3 impact shocks per direction (6 directions)
Vibration
30g's, 50 to 2000Hz, 1 oct per minute, 3 sweeps per axis (3 axes)
VOLTAGE DISTRIBUTION RATIO AND SUPPLY VOLTAGE
Electrodes
Ratio
3
1
1
ENVIRONMENTAL TESTING
K
Dy1
Dy2
Dy3
Dy4
1
Dy5
1
Dy6
1
Dy7
1
1
Dy8
Dy9
Dy10
P
1
1
1
1000nA at 175
°
C
NOTE:
Anode characteristics are measured with the voltage distribution ratio shown below.