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(一)选择最佳方案 按五机部207所要求,试制产品技术指标如下:分辨力>20(?)/cm,偏转灵敏度(x,y)>0.25inm/V显示字符1cm×1cm,(失真<5％),并适当兼顾字符4cm×4cm时的失真(<15％),全管长度<480mm。 首先按偏转灵敏度要求算出Ax,Ay。 对PDAL(1)+GVN(7)测得电子枪偏转灵敏度x:0.6956mm/V。 y:07922mm/V所以要Ax>0.36,Ay>0.32 对PDAL(2)+GVN(5)算得电子枪偏转灵敏度x:0.44mm/V,y:0.46mm/V,所以要Ax>0.57,Ay>0.54。 这些技术指标中,这里以分辨力为最重要。 由于发射系统没有进行计算,对应20(?)/cm的M值无法算出,虽然20(?)/cm的指标不高,考虑到电子枪性能较差,确定M≤12.5。
(A) choose the best program According to the requirements of the five machine 207, trial product technical indicators are as follows: Resolution> 20 (?) / Cm, deflection sensitivity (x, y)> 0.25inm / V Display characters 1cm × 1cm, Distortion <5%), and take into account the characters when the characters 4cm × 4cm distortion (<15%), the total tube length <480mm. First, according to deflection sensitivity requirements calculated Ax, Ay. For PDAL (1) + GVN (7), the deflection sensitivity of the electron gun x: 0.6956 mm / V was measured. y: 07922mm / V So to Ax> 0.36, Ay> 0.32 For PDAL (2) + GVN (5) the deflection sensitivity of the gun x: 0.44mm / V, y: 0.46mm / 0.54. Among these technical indicators, resolution is the most important here. Since the launch system is not calculated, the value of M corresponding to 20 (?) / Cm can not be calculated. Although the index of 20 (?) / Cm is not high, considering the poor performance of the electron gun, it is determined that M?