Northwest NSL500B Owner's Manual
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Northwest NSL500B Owner's Manual

Builders level/transit level
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NSL100B BUILDERS LEVEL
NSL500B TRANSIT LEVEL
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Summary of Contents for Northwest NSL500B

  • Page 1 Owner's Manual Owner's Manual Owner's Manual Owner's Manual NSL100B BUILDERS LEVEL NSL500B TRANSIT LEVEL...

  • Page 2: Table Of Contents

    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 7 4.3 Measuring Height Difference page 8 4.4 Horizontal Circle and Vernier Reading page 9 5.

  • Page 3: Nomenclature

    Cover w/ Sun Shade Horizontal Tangent Knob Horizontal Circle Leveling Base Plate Screw NSL100B Focus Knob Vertical Clamp Screw Objective Vertical Tangent Lens Cover Screw w/ Sun Shade Plate Vial Vertical Dial Horizontal Tangent Knob Leveling Screw Horizontal Circle Base Plate NSL500B...

  • Page 4: Care And Maintenance

    3. CARE AND MAINTENANCE Your Northwest Siteline Levels and Transit Levels are designed for use 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 normal field use.

  • Page 5: Setting Up Your Instrument

    8. Make sure not to over-tighten the leveling screw, clamp screw or adjusting screw. 9. It is recommended that you have a qualified service technician check your instrument periodically...

  • Page 6: Using Your Instrument

    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 tripod head is approximately level.

  • Page 7: Stadia Measurement

    Turn the knob slowly to avoid moving past a focused image. 4.2 Stadia Measurement Your Northwest Instrument Siteline Level is equipped with a stadia reticle so you can make distance estimates. The stadia lines are located in the reticle as shown in Diagram 4.2A below.

  • Page 8: Measuring Height Difference

    4.3 Measuring Height Difference (1) Set up the instrument at a point approximately halfway between points A and B. See (Fig 4.3A). NOTE: The reticle stadia lines can be used to optically estimate the distances. See (Fig 4.2A) (2) Position the rod vertically at point A. Take the reading a (backsight) on the rod at point A.

  • Page 9: Horizontal Circle And Vernier Reading

    negative if point B is lower than point A.) When the distance between points A and B is large or if the height distance is great: (1) Divide the distance into a number of sections and determine the height difference of each section. (2) The height difference between points A and B is the total of the height differences of all the sections.
  • Page 10 NSL500B TRANSIT LEVEL USES AND APPLICATIONS The NSL500B transit level has all the same functions and capabilities as the NSL100B level. By unlocking the lock lever, you make the instrument capable of measuring vertical angles.

  • Page 11: Checking And Adjusting Your Instrument

    5. Checking and Adjusting Your Instrument Although this instrument has been calibrated and adjusted before shipping out of NWI, instruments may come out of calibration during shipping. Because of this, we strongly suggest that you have this instrument checked before use. The following procedures may help to fulfill this purpose.

  • Page 12: Crosshairs

    Level the instrument. Set up a vertical line with plumb bob 20 feet away from instrument. Observe the vertical line against the cross hair. If vertical lines do not match, instrument needs to be calibrated by a technician. For calibration and adjustment, call NORTHWEST INSTRUMENT, INC. to find a service center near you.

  • Page 13: Specifications

    6. SPECIFICATIONS NSL100B NSL500B Telescope Magnification Working Range >200 ft >200 ft Objective Aperture 22mm 22mm Minimum Focus 3.5 ft 3.5 ft Stadia Ratio 1:100 1:100 Transit Capabilities +/- 45° Leveling Head 3 screws 3 screws Tripod Thread 5/8 x 11 5/8 x 11 Approx.
  • Page 14 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 proven to Seller’s satisfaction. At the time that it is proven to the Seller’s satisfaction that the instrument is defective, it shall be repaired or replaced, at the Seller’s option and returned to the original purchaser at no cost to...
  • Page 15 Seller shall notify the Buyer of such repair charges and proceed only after authorization has been received. This warranty does not apply to instruments damaged in transit to or from Northwest Instrument or any authorized repair center. Other remedies may or may not be available for transportation damages.

This manual is also suitable for:

Nsl100b

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