1 1. Contents 2. Nomenclature page 3 3. Care and maintenance page 4 4. Using your instrument 4.1 setting up your instrument page 5 4.2 stadia measurement page 5 4.3 measuring height difference page 6 4.4 horizontal circle and vernier reading page 7 4.5 compensator lock page 8 5. Checking and adjusti...
2 2. Nomenclature base plate horizontal circle compensator lock eyepiece quick sight bubble reflector focus knob horizontal tangent knob leveling screw sun shade circular vial.
3 3. Care and maintenance your northwest automatic levels are designed to be used generally in civil engineering and construction as well as for farm, mining and forestry industries. With the appropriate care, your instrument will need only minimal routine maintenance and minor adjustments under nor...
4 4. Using your instrument 4.1 setting up your instrument 1) loosen the straps around the tripod legs. Lift the extension quick-release clamps. With the tripod closed extend the legs to roughly eye level and re-tighten the quick clamps. 2) position the legs in a triangular position, making sure the ...
5 4.2 stadia measurement your northwest instrument automatic level is equipped with a stadia reticle so you can make simple distance measurements. The stadia lines are located in the reticle as shown in diagram 4.2a below. Sight the rod, read the two observations at the stadia lines, take the differ...
6 4.3 measuring height difference (1) set up the instrument at a point approximately halfway between points a and b (fig 4.3a). Note: the reticle stadia lines can be used to optically compare the distances. See (fig 4.2a) (2) position the rod vertically at point a. Take the reading a (backsight) on ...
7 4.4 horizontal circle and vernier reading your instrument is equipped with a easy to read horizontal circle for simple angle turning. You can find the circle and index line above the circle-positioning ring. The horizontal ring is easy to use. It is graduated every single degree and is numbered ev...
8 5. Checking and adjusting your instrument 5.1 circular level set up your instrument properly on the tripod. Adjust the leveling screws to center the bubble into the circle vial. Turn the telescope 180 degree clockwise, check the bubble position, and then, turn the telescope 180 degree counterclock...
9 5.3 crosshair level the instrument. Observe the horizontal hair while moving the telescope left and right, making sure the horizontal hair stays on a point. If it does not remain on point, the diaphragm should be rotated until it will stand this test. Loosen the screws holding crosshair ring and g...
10 6. Specifications / selection guide model no. Ncl-22 ncl-26 ncl-32 magnification 22x 26x 32x leveling accuracy 1/16" @ 100' 1/16" @ 200' 1/16” @ 300 working range w/rod 200' 300' 400 telescope image erect objective aperture 1.2" field of view 1.5 resolution 3.5" minimum focus 3.3' stadia ratio 1:...
11 standard warranty terms northwest instrument, inc. (seller) warrants this instrument made by northwest instrument to be free from manufacturing defects in materials and workmanship. For claims to be made under this warranty the instrument must be inspected by northwest and the defect must be prov...
