XQ1395

(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 M) 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. 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.

XQ1395 Camera Tubes are the key component of High Performance X-ray TV systems in medical applications. Their high sensitivity and high dynamic range combined with high resolution allows real-time x-ray imaging for any type of medical imaging as during critical surgeries. The Resistron^® camera tube XQ 1395 is a 1" diameter image tube with magnetic focusing and magnetic deflection method for camera installations adapted through optics to X-ray image intensifiers.