本仪器用于测量视度值在±6.6个视度范围内的光学仪器的视度。二、 原理本仪器是在4×视度前置镜的基础上增设一套（十块）已知视度值（分别为±1，±2，±3，±4，±5个视度）的视度透镜构成的。测量时根据被测仪器的视度，选取对应的一块视度透镜拧在视度筒的外管上，置于4×视度前置镜的物镜前。视度透镜将被测仪器的视度先抵消一部分，致使被测视度值剩余部分在±1.5个视度范围内，便可利用4×视度前置镜视度刻尺测出其剩余视度数值。由视度透镜的视度值与4×视度前置镜测得之视度值得到被测仪器视度值。这样，就扩大了视度的测量范围。??? 增设的十块视度透镜分别装在透镜框内，透镜柜上分别刻有 5D， 4D， 3D， 2D， 1D，-1D，-2D，-3D，-4D，-5D的符号和数字。三、 仪器诸元目镜焦距??????????????????????????? 20.86mm物镜焦距??????????????????????????? 79.9mm物镜有效孔径??????????????????????? 17mm视度透镜透镜焦距（mm） -200.04 -250.09 -333.51 -500.10 -1000.19 1000.19 500.10 333.51 250.09 200.04所用透镜框的标记 5D 4D 3D 2D 1D -1D -2D -3D -4D -5D视度透镜有效孔径??????????????????? 14mm视度标尺分划格值??????????????????? 0.25个视度视度标尺分革刻度范围??????????????? ±1.5个视度测量范围??????????? ????????????????±6.5个视度外管刻线格值??????????????????????? 1mm外管刻线范围??????????????????????? 25mm var taFace = null; function FaceInit() { taFace = document.getElementsByTagName('textarea')[0]; taFace.setAttribute("onkeydown", "TraceCursorPosition(this)"); taFace.setAttribute("onkeypress", "TraceCursorPosition(this)"); taFace.setAttribute("onfocus", "TraceCursorPosition(this)"); taFace.setAttribute("onselect", "TraceCursorPosition(this)"); taFace.setAttribute("onmouseover", "TraceCursorPosition(this)"); taFace.setAttribute("onmousedown", "TraceCursorPosition(this)"); } function FaceShow() { if(taFace == null) FaceInit(); if (document.getElementById('dFace').style.display == 'none') { document.getElementById('dFace').style.display = 'block'; } else FaceHide(); } function FaceHide() { document.getElementById('dFace').style.display = 'none'; } var pFace; function Face(text) { if (!pFace) TraceCursorPosition(taFace); taFace.value = taFace.value.slice(0, pFace.start) +"[:" + text + ":]" + taFace.value.slice(pFace.end); FaceHide(); } function TraceCursorPosition(obj) { pFace = $CursorPosition(obj); } function $CursorPosition(textBox) { var start = 0, end = 0; if (typeof (textBox.selectionStart) == "number") { start = textBox.selectionStart; end = textBox.selectionEnd; } else if (document.selection) { var range = document.selection.createRange(); if (range.parentElement().id == textBox.id) { var range_all = document.body.createTextRange(); range_all.moveToElementText(textBox); for (start = 0; range_all.compareEndPoints("StartToStart", range) < 0; start++) range_all.moveStart('character', 1); var i; for (i = 0; i 以上是大量程视度管的详细信息，如果您对大量程视度管的价格、厂家、型号、图片有什么疑问，请联系我们获取大量程视度管的新信息。