XP2262 Datasheet, PDF (2/3 Pages) List of Unclassifed Manufacturers – A standard fast, 12-stage, 51mm (2) tube

photomultiplier tubes
product specification
XP2262
Recommended voltage divider
Type A for maximum gain
K D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 A
4 1.1 0.9 1 1
11
1 11111
(total : 16)
Type B for best timing / linearity compromise
K D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 A
4 1.1 0.9 1 1 1 1.25 1.25 1.5 2.25 1.75 2.75 2.5
K: photocathode Dn: dynode A: anode
(total : 22.25)
Limiting values
Anode luminous sensitivity :
Supply voltage :
Continuous anode current :
max.: 2x10⁸
max.: 2500
V
max.: 0.2
mA
Voltage between :
D1 and photocathode :
consecutive dynodes :
anode and D12 :
min.: 300
max.: 800
V
max.: 400
V
min.: 80
max.: 600
V
Ambient temperature :
short operation (< 30 mn) :
min.: -30
max.: +80
°C
continuous operation & storage : min.: -30
max.: +50
°C
Notes
þ Characteristic measured and mentioned on the test ticket of each tube.
• Luminous sensitivity is measured with a tungsten filament lamp with a colour temperature of 2856 ± 5 K. The blue
radiant blue sensitivity expressed in A/lmF ("F" as filtered) is measured with a tungsten filament lamp with a colour
of 2856 ± 5 K transmitted through a blue filter Corning Cs N°5-58, polished to half stock thickness.
‚ Dark current is measured at ambient temperature, after the tube has been in darkness for approximately 1 min. A
lower value can be obtained after a longer stabilisation period in darkness (approx. 30 min.).
ƒ Noise is measured at ambient temperature. After having been stored with its protection hood, the tube is placed in
darkness with Vd set at a value to give a gain of 3 10⁷. After a 30mn stabilisation period, noise pulses above a
threshold of 1 pC (corresponding to 0.2 photoelectron) are recorded.
„ The peak to valley ratio is defined as the single electron peak value divided by the minimum value to the left of the
peak.
… To obtain a peak pulse current greater than that obtainable with divider A, it is necessary to increase the
inter-dynode voltage progressively. Divider circuit B is an example of a progressive divider, giving an optimisation
of speed and linearity. other dividers can be conceived to achieve other compromises. It is generally recommended
that the voltage ratio between two successive stages is less than 2.
† Measured with a pulse light source, with a pulse duration (FWHM) of approximately 1ns., the cathode being
completely illuminated. The rise time is determined between 10 % and 90 % of the anode pulse amplitude. The
signal transit time is measured between the instant at which the illuminating pulse of the cathode becomes
maximum, and the instant at which the anode pulse reaches its maximum. Rise time, pulse duration and transit
time vary with respect to high tension supply voltage Vht as (Vht)-½. Transit Time Difference between centre and
edge (18mm from PK centre) is 0.25 ns at 2500 V with C divider.
Note : The envelope of the tube is covered with a conductive coating connected to the photocathode on top
of which a black paint is applied. This paint is neither guaranteed to be light-tight nor electrically
insulating. Care should be taken to avoid electrical shock.
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18/09/98
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