Johnson 40-6926 User manual

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.

4579H_Manuals 4/4/11 8:37 AM Page 1

Table of Contents

1. it Contents

2. Features and Functions

3. Location of Parts/Components

4. Operating Instructions

5. Calibration

6. Technical Specifications

7. Care and Handling

8. Product Warranty

9. Product Registration

10. Accessories

1. Kit Contents

Description for Model 40-6926 ty.

26X Automatic Level 1

Instruction Manual with Warranty Card 1

Hard Shell Carrying Case 1

Description for Model 40-6960 ty.

30X Automatic Level 1

Instruction Manual with Warranty Card 1

Hard Shell Carrying Case 1

Description for Model 40-6962 ty.

32X Automatic Level 1

Instruction Manual with Warranty Card 1

Hard Shell Carrying Case 1

4579H_Manuals 4/4/11 8:37 AM Page 2

2. Features and Functions

• Water resistant, sealed construction for use in most weather

conditions

• Wire-hung, magnetically dampened compensator

• Large, easy-to-use focusing knob

• 360º horizontal circle

• Penta prism for bubble viewing

• Top-mounted optical sight for quick reference

• Fine adjustment knobs on left and right sides with endless

horizontal drive

• 1:100 stadia for distance estimation

• 5/8” x 11 threads to fit standard tripods

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3. Location of Part/Components

Circular bubble vial

observation prism

Circular bubble vial

Adjusting screws for

circular bubble vial

Eyepiece cover

Eyepiece

focusing knob

Horizontal circle

Leveling screw

Horizontal circle

reference mark

Compensator

check button

Optical sight

Base plate

Focusing knob

Objective lens

Horizontal tangent knob

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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.

Focus the telescope by locating a target, such as a leveling rod, using

the optical sight. Looking through the eyepiece, use the focusing

knob to bring the target into sharp focus. Center the cross hair

to the target using the horizontal tangent knobs on either side of

the instrument.

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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.

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.

Angle Measurement

As shown in figure 2, sight point A and note the reading on the

horizontal circle. Rotate the level and sight point B. The angle turned

is the difference between A and B. The angle A0B = xº = A - B.

Fig. 1

Fig. 2

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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 compen-

sator 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. The bubble should remain centered (Fig. 3). If the

bubble moved from the center, the vial needs adjustment (Fig. 4).

Turn the leveling screws to bring the bubble halfway to center (Fig. 5).

Using the allen wrench, turn the two vial adjustment screws to center

the bubble (Fig. 6).

Repeat the above procedure until the bubble remain centered when

the level is rotated 180º.

Fig. 3 Fig. 4

Fig. 5 Fig. 6

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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).

If a1 - b1 = a2 - b2 = H, the line-of sight is horizontal. If not, the level

should be adjusted as follows.

Because the instrument is set halfway between A and B, any error in the

line-of-sight causes both readings to be erroneous by the same amount.

Error e cancels out, so the value a1 - b1 = H is correct. Therefore,

a2 - H = b3, the adjusting value.

To adjust, unscrew the eyepiece cover.

Turn the adjusting screw with the

adjusting pin (Fig. 9) until the horizontal

cross hair gives the reading b3 on rod B.

Repeat the above procedure until

{(a1 - b1) - (a2 - b2)} ≤ 3mm.

Fig. 7 Fig. 8

Fig. 9

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6. Technical Specifications

Telescope Erect

Magnification 26X (40-6926), 30X (40-6960),

32X (40-6962)

Leveling accuracy ± 1/16"/200 ft. (±1.5mm/160m)

Working range Up to 350’ (100m) (40-6926)

Up to 400’ (120m) (40-6960)

Up to 450’ (130m) (40-6962)

Clear objective aperture 40 mm

Field of view 1º 30’

Shortest focusing distance 0.0315” (0.8m)

Stadia ratio 100

Stadia addition 0

Water resistant Yes

Sensitivity of bubble 8’ (2mm)

Circle graduation 1º

Standard deviation for

1km double-run leveling 0.0689” (1.75mm)

Compensator:

Working range ± 15’

Setting accuracy ± 0.8”

Dimensions 7.520” x 5.197” x 5.394”

(191 x 132 x 137mm)

Weight 3.395 lbs (1.54 g)

Center screw thread 5/8” - 11

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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. Product Warranty

Johnson Level & Tool offers a three year limited warranty on each of its

products. You can obtain a copy of the limited warranty for a

Johnson Level & Tool product by contacting Johnson Level & Tool's

Customer Service Department, as provided below, or by visiting our

web site at www.johnsonlevel.com. The limited warranty for each

product contains various limitations and exclusions.

Do not return this product to the store/retailer or place of purchase.

Non-warranty repairs and course calibration must be done by an

authorized Johnson®service center or Johnson Level & Tool's limited

warranty, if applicable, will be void and there will be NO WARRANTY.

Contact one of our service centers for all non-warranty repairs. A

list of service centers can be found on our web site at

www.johnsonlevel.com or by calling our Customer Service

Department. Contact our Customer Service Department for Return

Material Authorization (RMA) for warranty repairs (manufacturing

defects only). Proof of purchase is required.

4579H_Manuals 4/4/11 8:37 AM Page 10

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