13
USING THE VERTICAL TUBE -
MODELS AY11230/11234
1. The vertical tube can be used for  
     instructional viewing or to 
photograph      the image witrh a 
digital camera or       micro TV 
unit.
2. Loosen the retention screw, then rotate  
    the adjustment ring to change the  
     length of the vertical tube.
3. Make sure that both the images in 
OPERATION (cont.)
SELECTING OBJECTIVE 
MAGNIFICATION  
1. There are two objectives. The lower  
    magnification objective has a greater  
    depth of field and view.
2. In order to observe the specimen  
    easily use the lower magnification  
    objective first. Then, by rotating the  
    case, the magnification can be   
    changed.
CHANGING THE INTERPUPILLARY 
DISTANCE
1. The distance between the observer's  
    pupils is the interpupillary distance.   
2. To adjust the interpupillary distance  
    rotate the prism caps until both eyes  
    coincide with the image in the   
    eyepiece. 
 
FOCUSING
1. Remove the lens protective cover.
2. Place the specimen on the working  
    stage.
3. Focus the specimen with the left eye  
    first while turning the focus knob until  
    the image appears clear and sharp.
4. Rotate the right eyepiece ring until the  
    images in each eyepiece coincide and  
    are sharp and clear.
CHANGING THE BULB
1. Disconnect the power cord.
2. When the bulb is cool, remove the  
    oblique illuminator cap and remove  
    the halogen bulb with cap.
3. Replace with a new halogen bulb.
4. Open the window in the base plate and  
    replace the halogen lamp or   
    fluorescent lamp of transmitted   
    illuminator.
FOCUSING
1. Turn the focusing knob away or toward  
    you until a clear image is viewed.
2. If the image is unclear, adjust the  
    height of the elevator up or down,  
    then turn the focusing knob again.
ZOOM MAGNIFICATION
1. Turn the zoom magnification knob to  
    the desired magnification and field of  
    view.
2. In most situations, it is recommended  
    that you focus at the lowest   
    magnification, then move to a higher  
    magnification and re-focus as   
    necessary.
3. If the image is not clear to both eyes  
    at the same time, the diopter ring may  
    need adjustment.
DIOPTER RING ADJUSTMENT
1. To adjust the eyepiece for viewing with  
    or without eyeglasses and for   
    differences in acuity between the right  
    and left eyes, follow the following  
    steps:
    a. Observe an image through the left  
        eyepiece and bring a specific point  
        into focus using the focus knob.
    b. By turning the diopter ring   
        adjustment for the left eyepiece,  
        bring the same point into sharp  
        focus.
     c.Then bring the same point into  
        focus through the right eyepiece   
        by turning the right diopter ring.
     d.With more than one viewer, each  
        viewer should note their own   
        diopter ring position for the left   
        and right eyepieces, then before  
        viewing set the diopter ring   
        adjustments to that setting.
CHANGING THE BULB
1. Disconnect the power cord from the  
    electrical outlet.
2. When the bulb is cool, remove the  
    oblique illuminator cap and remove  
    the halogen bulb with cap.
3. Replace with a new halogen bulb.
4. Open the window in the base plate   
    and replace the halogen lamp or  
    fluorescent lamp of transmitted   
    illuminator.
     
Model AY11230 Model AY11234
14
Objectives
Revolving Turret
Coarse 
Adjustment
Knob
MODEL AY11236
MICROSCOPE USAGE
BARSKA Model AY11236 is a powerful fixed power compound 
microscope designed for biological studies such as specimen 
examination. It can also be used for examining bacteria and          
for general clinical and medical studies and other scientific uses. 
CONSTRUCTION
BARSKA Model AY11236 is a fixed power compound microscope.   
It is constructed with two optical paths at the same angle. It is