XQ1395 Datasheet, PDF (4/6 Pages) PerkinElmer Optoelectronics – 1 High Resolution Resistron - Camera Tube

Maximum Ratings (absolute values)
Full size scanning of the 15.0 mm x 20.0 mm area of the photoconductive layer must be assured.
Description
Grid no. 1 voltage positive
Grid no. 1 voltage negative
Grid no. 2 voltage
Grid no. 2 load
Grid no. 3 voltage
Grid no. 4 voltage
Peak heater-cathode voltage
heater negative with respect to cathode
heater positive with respect to cathode
Faceplate temperature
Parameter
max. 0 V
max. –150 V
max. 450 V
max. 0.8 VA
max. 900 V
max. 1000 V
max. 125 Vp
max. 10 Vp
max. 70°C (12)
(1) If the maximum variation of the heater voltage exceeds the absolute limit of ± 5 %, the
operating performance of the tube will be impaired and its life shortened. If series
connection is applied, the heater voltage may not exceed 9.5 V. It is recommended to use a
current limiter. The preheating time of the tube should be 1 minute minimum with beam
current off.
(2) Optimum focusing of the electron beam is obtained by adjusting either the focusing coil
current or varying grid no. 3 voltage. Grid no. 3 voltage should be between 65 and 75 % of
the voltage applied to grid no. 4 voltage. Optimum resolution is obtained by highest grid no.
4 voltage. Higher grid no. 4 voltage requires an increase of deflection current. If grid no. 3
voltage is increased, a higher focusing current will be necessary. The optimum ratio of grid
no. 4 to grid no. 3 voltage depends on the type of focusing and deflection assembly. An
improper voltage ratio may produce brightening or darkening in the faceplate corners.
Generally, grid no. 4 voltage must be higher than grid no. 3 voltage.
(3) This capacitance which is the effective output impedance of the tube (resistive component
approx. 100 MΩ) increases if the tube is mounted in the focusing and deflection assembly.
(4) The upper limit of the signal electrode voltage must be adjusted to the value indicated in
the test sheet. This value applies to a faceplate temperature of 30 ± 2°C. To obtain an
optimum life time the dark current should not exceed the value of 30 nA.
(5) Measured with video amplifier of suitable bandwidth.
(6) At a color temperature of 2856 K.
(7) The signal current is the target output current, measured with an integral measuring
instrument, minus dark current. During the measurement the scanned area is uniformly
illuminated.
(8) Non-uniformity of the signal current depends on the quality of focusing and deflection
assembly, deflection linearity and beam alignment. The black to white transition in the
middle of the test pattern is set as 100 % value. The maximum signal deviations within a
radius of 6.4 mm are measured.
(9) The modulation depth is measured at the faceplate center at 20 lp/mm in comparison with
1.3 lp/mm. The modulation depth depends on the signal current. The signal current
amounts to 200 nA, the beam current is adjusted for stabilising a signal of 500 nA.
(10) The decay lag is measured in percent of the signal current, which is preset at 250 nA. The
beam current is adjusted for stabilising a signal of 500 nA.
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Camera Tube
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