4579H_Manuals 4/4/11 8:37 AM Page 1 Automatic Levels Model No. 40-6926, 40-6960, 40-6962 Instruction Manual Congratulations on your choice of this Automatic Level. We suggest you read this instruction manual thoroughly before using the instrument. Save this instruction manual for future use. ©2011 Johnson Level & Tool - Rev.
4579H_Manuals 4/4/11 8:37 AM Page 2 Table of Contents 1. Kit Contents 2. Features and Functions 3. Location of Parts/Components 4. Operating Instructions 5. Calibration 6. 7. 8. 9. 10. Technical Specifications Care and Handling Product Warranty Product Registration Accessories 1. Kit Contents 2 Description for Model 40-6926 26X Automatic Level Instruction Manual with Warranty Card Hard Shell Carrying Case Qty.
4579H_Manuals 4/4/11 8:37 AM Page 3 2.
579H_Manuals 4/4/11 8:37 AM Page 4 3. Location of Part/Components Circular bubble vial observation prism Circular bubble vial Eyepiece cover Eyepiece focusing knob Horizontal circle Adjusting screws for circular bubble vial Compensator check button Optical sight Leveling screw Horizontal circle reference mark Focusing knob Objective lens Horizontal tangent knob Base plate 4 ©2011 Johnson Level & Tool - Rev.
4579H_Manuals 4/4/11 8:37 AM Page 5 4. Operating Instructions IMPORTANT: It is the responsibility of the user to verify the calibration of the instrument before each use. Set-Up Set the tripod up level and in a comfortable position to view through the telescope. Connect the instrument to the tripod with the 5/8”-11 central screw. Using the leveling screws, center the circular bubble. Aiming and Focusing Focus the cross hairs by turning the eyepiece focusing knob until the cross hairs are sharp and black.
4579H_Manuals 4/4/11 8:37 AM Page 6 Reading measurements using a Leveling Rod Height reading Read the rod where it is intersected by the horizontal hair. For example, the height reading in Figure 1 is 2.0 ft. Fig. 1 Distance Measurement Read the rod where it is intersected by the upper and lower stadia hairs. In Figure 1, these readings are at 1.9 ft. and 2.1 ft. The stadia ration is 1:100, therefore the distance from the instrument to the rod is: (2.1-1.9) x 100 = 20ft.
4579H_Manuals 4/4/11 8:37 AM Page 7 5. Calibration 5.1 Compensator Check Button Check the compensator for proper operation before use or anytime the operation of the instrument is in question. Push and release the compensator check button to shake the compensator. The compensator should return to the exact horizontal position sighted before the check button was pressed. 5.2 Circular Bubble Vial Center the vial bubble using the leveling screws, then rotate the instrument 180º.
4579H_Manuals 4/4/11 8:37 AM Page 8 5.3 Line-of-Sight The line-of-sight needs to be horizontal within 3mm of level to be accurate. Set up and level the instrument on a tripod midway between two leveling rods set approximately 100 ft. to 160 ft. (30m to 50m) apart. Sight rods A and B; the height readings are a1 and b1 (Fig. 7). The value “H” is equal to (a1 - b1). Move the instrument to within 6 ft. (2m) of rod A and re-level. Again sight rods A and B; these height readings are a2 and b2 (Fig. 8). Fig.
4579H_Manuals 4/4/11 8:37 AM Page 9 6. Technical Specifications Telescope Magnification Leveling accuracy Working range Clear objective aperture Field of view Shortest focusing distance Stadia ratio Stadia addition Water resistant Sensitivity of bubble Circle graduation Standard deviation for 1km double-run leveling Compensator: Working range Setting accuracy Dimensions Weight Center screw thread ©2011 Johnson Level & Tool - Rev. 1 Erect 26X (40-6926), 30X (40-6960), 32X (40-6962) ± 1/16"/200 ft. (±1.
4579H_Manuals 4/4/11 8:37 AM Page 10 7. Care and Handling Care must be taken to maintain the accuracy of the instrument. • After each use, the instrument should be wiped clean and kept in its carrying case. • Remove dust from the lenses with a soft brush or a nonabrasive wipe. Never touch the lenses with your fingers. • Store the instrument in a dust-free area with low humidity. • A bag of silica gel dryer is included with each instrument. 8.
4579H_Manuals 4/4/11 8:37 AM Page 11 NOTE: The user is responsible for the proper use and care of the product. It is the responsibility of the user to verify the calibration of the instrument before each use. For further assistance, or if you experience problems with this product that are not addressed in this instruction manual, please contact our Customer Service Dept. In the U.S., contact Johnson Level & Tool’s Customer Service Department at 888-9-LEVELS.
4579H_Manuals 4/4/11 8:37 AM Page 12 10. Accessories Johnson® accessories are available for purchase through authorized Johnson® dealers. Use of non-Johnson® accessories will void any applicable limited warranty and there will be NO WARRANTY. If you need any assistance in locating any accessories, please contact our Customer Service Department. In the U.S., contact Johnson Level & Tool’s Customer Service Department at 888-9-LEVELS.
