Johnson Level 40-6935 User Manual

WARNING:

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Electronic Digital Theodolite

Model No. 40-6932 and 40-6935

Instruction Manual

Congratulations on your choice of this Electronic Digital Theodolite. We suggest you read this instruction manual thoroughly before using the instrument. Save this instruction manual for future use.

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Table of Contents

1. Kit Contents

2. Features and Functions

3. Location of Parts/Components

4. Operating Instructions

5. Using the Product

6. Self-Check & Fine Calibration

7. Technical Specifications

8. Care and Handling

9. Product Warranty

10. Warranty Registration

11. Accessories

1. Kit Contents

Description for Model 40-6932 & 40-6935 Qty.

Electronic Digital Theodolite

Alkaline Battery Pack (batteries not included) 1

NiMH Rechargeable Battery Pack 1

NiMH Battery Charger 1

Rain Hood 1

Adjustment Tools 1

Instruction Manual with Warranty Card 1

Hard-Shell Carrying Case 1

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2. Features and Functions

• 2” or 5” angular accuracy - accurate enough for any construction job

• Vertical axis compensation - tilt sensor provides the highest level of accuracy and can be turned on or off depending on job requirements

• Dual LCD with large characters - easy to see angle readings eliminate errors and reduces eye fatigue

• Backlit LCD screen and telescope reticle - allows work in low light conditions including indoors and extended hours near dawn and dusk

• Simple six button keypad - quick setups and simple operation with low operator learning curve

• Large suite of programmable settings - provide multiple options for various users and job requirements including zero position of vertical angle

• Measurement units in degrees, gon, or mils

• 90 degree angle audible notification - for quick turning and set out of right angles

• Instant conversion of vertical angles to percent of grade convenient for slope work

• Ni-MH rechargeable battery pack and charger - lower operating cost with reusable batteries

• Alkaline battery pack standard - provides backup and eliminates downtime if the charge is lost in the middle of a job

• Battery status indicator - no power surprises and allows for better planning

• Automatic shutoff - conserves battery life when not in use - can be disabled if desired

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3. Location of Part/Components

Targeting Sight

Objective Lens

LCD Display

Operating Keys

Circular Vial

Tripod Base Plate

Focusing Ring

Optical Plummet

Communication Port

Leveling Screw

Handle

Handle Screw

Center Mark & Vertical Plate

Horizontal Fine Motion

Horizontal Clamp

Tubular Vial

Battery Case

Eyepiece

Telescope Fine Motion

Telescope Clamp

Tribrach Locking Lever

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4. Operating Instructions

101112

5 6

Display and Display Explanation

1. Ht - Total value of repeated angles measured

2. V - Vertical angle

3. Number of repeated measurements

4. AVG - Value of repeated angle measurements

5. HR - Angle increases with clockwise turning

6. HL - Angle increases with counterclockwise turning

7. TILT - Tilt sensor

8. F - Function mode

9. G - Angle unit GON

10. % - Vertical slope in percent

11. REP - Repeated angle measurement mode

12. Battery power indication

Note: If the display shows “b” after activating the tilt sensor, the instrument exceeds its compensation range and the instrument should be leveled.

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Operating Panel and Operating Keys

Function key selection

Hold horizontal angle reading

Set horizontal-angle rotation direction

lluminating the display

Moving the cursor to the left

Moving the cursor to the right

Change the number indicated by the cursor

Power key

Zero the horizontal angle reading

Change vertical angle to percent of grade

Repeated angle measurement

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Preparation Before Measurement

Centering and Leveling with Optical Plummet

• Level and center the instrument precisely to ensure its best

performance.

• Extend the tripod legs to a suitable working height with equal length

legs. Spread the tripod legs and make the tripod head as level as possible while at the same time placing the center of the tripod head directly over the ground point. Press the leg feet firmly into the ground and make sure the tripod legs are locked.

• Set the instrument carefully on the center of the tripod head

orientating the leveling screws centered with each tripod leg. Attach the instrument to the tripod. Make sure the center mark is visible on all three leveling screws (this ensures a complete leveling range).

• Adjust the Optical Plummet Eyepiece to focus the bullseye. Adjust the

Optical Plummet telescope focus to see the ground clearly. If you can not see the ground point while looking through the optical plummet, carefully lift two of the tripod legs, then pivot on the third leg, carefully moving the tripod until the ground point is within one inch of the reticule. Press the two tripod feet back into the ground and recheck the optical plummet alignment. Repeat if necessary until the ground point can be seen in the optical plummet field. Complete the alignment by turning the leveling screws (you will not be level but you are pointed correctly).

• Now center the instruments Circular Vial by carefully extending or

shortening the tripod legs closest to the bubble. Note: Use only two legs. Repeat until alignment is within 6mm (1/4 inch) or better.

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• Rotate the leveling screw 1, 2 to move the bubble to the center line of circular level which is perpendicular to the connection line 1,2.

• Rotate the leveling screw 3 to move the bubble to the center of the circular level.

• Next use the Tubular Vial to accurately level the instrument. Unlock and turn the instrument so that the tubular vial is parallel to BC, any two leveling screws. Note the direction to turn the leveling screws in the graphic. When turning the two screws, adjust them equally. The bubble will move in the direction that your left thumb turns. To move the bubble to the right, turn the B leveling screw in and simultaneously turn the C leveling screw in. To move the bubble left, move both screws out simultaneously. Once centered turn the instrument 90º over A leveling screw and turn screw A in or out until bubble is centered. Go back to the first position BC, and repeat until the bubble is centered in both positions. Then from position BC turn 180º to check the adjustment. If the bubble stays centered or within 1/4 division, you are level.

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• Now check the ground point centering. If you are not directly on the point, carefully loosen the tripod fastener and move the instrument on the tripod head in an x - y direction. Do not rotate the instrument. Recheck leveling and repeat until instrument is level and over the ground point at the same time. With practice, this becomes easier.

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5. Using the Product

Turning on the Instrument

Press the power key on the instrument for 2 seconds and all the symbols will be displayed on the LCD. The buzzer will sound twice and the horizontal angle value and “0-set” will be displayed. When “0-set” is displayed none of the key pads operate except for the power key. Rotate the telescope 360º to activate the vertical measuring mode and to activate the keypad.

Battery Strength Indicator

The battery symbol on the LCD window displays the current battery strength.

Full power

Effective battery

Weak voltage but still effective, suggest changing battery packs

Powers off automatically after symbol blinks. Replace the battery pack or recharge it.

Battery Strength

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Battery Replacement

Remove Battery Box

Battery Box Button

Push down to remove the battery box

Replace Alkaline Batteries

• Push down the battery cover tab and pull the battery cover away from the battery box.

• Take the old batteries out and put the new batteries in paying attention to the “+” and “-” pole.

• Snap the battery cover back into place.

Placing the Battery Box on the Instrument

Place the projection on the bottom

Hook

of the battery box into the slot on the instrument. Push the top of the battery box until it clicks into place.

Battery Cover Battery Cover

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