Unitron MEC4 Manual

Contents

Unitron MEC4 Manual Manual pdf 14 page image

MEC4 INVERTED METALLURGICAL MICROSCOPEUNITRON 14Operation (continued)Adjusting the Field Diaphragm (Fig. 14 & 15)By limiting the diameter of the light entering thecondenser, the field diaphragm can prevent stray lightand improve the image contrast. When the image isjust on the edge of the field of view, the objective canshow the best performance and obtain the clearestimage.Move the field diaphragm lever (FS) ① in or out toadjust the field diaphragm.The image of the field diaphragm can be seen whenobserving through the eyepiece.Adjust the right and left centering screws ② until thefield diaphragm is centered in the field of view.Using the Aperture Diaphragm (Fig. 14)The iris diaphragm determines the numerical aperture(N.A.) of the illumination system in bright fieldobservation. When the N.A. of the objective and theillumination system match, you can obtain higherimage resolution and contrast, as well as anincreased depth of focus.Move the aperture diaphragm lever (AS) ③ in or outto adjust the aperture diaphragm.Fig. 14①②Fig. 15③