NIKON DTM-520 (01) PDF Document

For your safety when using the NIKON DTM-520, please adhere to the following warnings:

• Never look at the sun through the telescope. Doing so may cause the loss of your eyesight.

• The NIKON DTM-520 does not have an explosion-protected construction. Do not use it in coal mines, areas with coal dust, or near other flammable substances.

• Never disassemble, modify, or repair the instrument. This could cause fire, electric shock, or burns.

• Only use the specified charger Q-75U/E for the battery pack BC-80. Using other chargers may cause fire or rupture. (Note: BC-80 cannot be charged with Q-7U/E or Q7C.)

• When recharging the battery pack, do not cover the charger with any blanket or clothing to prevent overheating. Ensure the charger can dissipate heat adequately.

• Avoid recharging in humid, dusty places, direct sunlight, or near heaters. Do not recharge when wet to prevent electric shock, overheating, or fire.

• Although the battery pack BC-80 has an auto-reset circuit breaker, avoid shorting the contacts to prevent fire or burns.

• Never burn or heat the battery, as it may cause rupture or injury.

• When storing the battery pack or charger, prevent short circuits by putting insulating tape on the contact points or using other protective methods. Failure to do so can result in a fire, burn, or instrument damage.

Please observe the following cautions when handling the tripod and carrying case for your NIKON DTM-520:

• The top of the tripod ferrule is very sharp. Be careful when handling or carrying the tripod to avoid injury.

• Always check the shoulder strap and its clasp before carrying the instrument in its case. A damaged strap or improper clasping can cause it to fall.

• Before setting up the tripod, ensure no one’s hands or feet are in the way to prevent them from being pierced by the tripod legs.

• Firmly fasten the thumb screws of the tripod legs after mounting the instrument. An unsecured tripod may collapse, causing injury or instrument damage.

• Securely fasten the clamp screw on the tripod after installing the instrument. Failure to do this may cause the instrument to fall.

• Fasten the leveling base clamp knob securely. If not, the leveling base may fall when you grasp the carrying handle, resulting in injury or damage.

• Do not move the instrument by grasping the carrying handle battery without first setting the mounting buttons to the LOCK position. The main unit could come loose and fall. Ensure the battery pack is securely clamped and the buttons are in the LOCK position.

• Do not use the carrying case as a stool. It is slippery and unstable, which could lead to a fall and injury.

• Do not swing or throw the plumb bob, as it may hit and injure another person.

• Read the instructions for the Quick Charger Q-75U/E before starting the charging operation.

To ensure the longevity and accuracy of your NIKON DTM-520, follow these maintenance guidelines:

• Avoid prolonged exposure to the sun or the heat of a closed vehicle.

• If the instrument has been used in wet conditions, wipe off all moisture and dry it completely before returning it to its case to prevent damage to the electronic assemblies.

• Sudden temperature changes can cloud the lenses or cause electrical failure. If this happens, leave the instrument in a warm location with the case closed until its temperature returns to room temperature.

• Avoid storing the instrument in hot, humid locations. Store the battery pack in a dry location at a temperature below 30°C to prevent mold growth and electronic deterioration.

• Store the battery pack discharged.

• When storing the instrument in very low temperatures, leave the carrying case open.

• Do not overtighten any of the clamp screws.

• When adjusting tangent or leveling screws, stay as close to the center of the screw’s range as possible. Use a clockwise rotation for final adjustments.

• If the leveling base will be unused for a long period, lock down the leveling base clamp knob and tighten its safety screw.

• To clean non-metallic parts like the keyboard or painted surfaces, use a soft cloth lightly moistened with water or mild detergent. Do not use organic solvents (like ether or paint thinner).

• Clean optical lenses by lightly wiping them with a soft cloth or lens tissue moistened with alcohol.

Handle the NIKON DTM-520 gently to avoid shocks or excessive vibration.

Unpacking:

Hold the carrying-handle and lift the instrument out of its case.

Packing:

1. Ensure the instrument is packed with the battery pack attached.

2. Set the telescope in the horizontal “face-left” position.

3. Align the storage mark (●) on the bottom of the face-left keyboard with the mark (▼) on the leveling base clamp knob.

4. Lightly fasten the clamp knobs and then place the instrument back in its case.

Recharging Procedure:

1. Insert the power plug of the charger into an AC outlet.

2. Connect the charging plug to the battery pack’s charging connector.

3. Quick charging will start automatically. The charging indicator will light up.

4. When charging is complete, the charging indicator will go out.

Discharging Procedure (to refresh battery capacity):

The battery is designed for repetitive use. If it is recharged while still having sufficient power (memory effect), its operational time may shorten. Discharging it first can refresh its capacity.

1. Insert the power plug into an AC outlet.

2. Connect the charging plug to the battery pack’s charging connector.

3. Press the discharge starting switch to begin discharging. The discharging indicator will light up.

4. When discharging is complete, the indicator goes out, and quick charging begins automatically. The charging indicator will light up.

To stop discharging before completion, press the discharge starting switch again. It is effective to discharge the battery pack once every 10 recharging cycles.

Always turn off the [PWR] key before attaching or detaching the battery pack. Avoid touching the battery pack contacts.

Detaching the BC-80:

1. Release the LOCK by turning the battery mounting buttons in the opposite direction of the arrow mark until they stop in the horizontal (UNLOCKED) position.

2. While depressing the battery mounting buttons, raise the battery pack to remove it from the main body.

Attaching the BC-80:

1. Ensure the battery mounting buttons are in the horizontal (UNLOCKED) position.

2. Align the mark (●) on the battery mounting button with the mark (●) on the main body.

3. While depressing the battery mounting buttons, fit the battery pack onto the connecting pins on top of the main body.

4. Release your fingers from the buttons, allowing the battery pack to settle into position.

5. Turn the mounting buttons in the direction of the arrow mark to the limit (vertical position) to engage the LOCK. A slight opening between the battery and the main body is normal and part of the design to maintain precision.

1. Open the tripod legs sufficiently to ensure the instrument is stable.

2. Make sure the station point on the ground is located directly beneath the center hole in the tripod head.

3. Firmly press the tripod ferrules into the ground.

4. Level the top surface of the tripod head. Precise leveling is necessary if a plumb bob will be used for centering.

5. Firmly fasten the thumb screws on the tripod legs.

6. Place the NIKON DTM-520 on the tripod head. Insert the tripod mounting screw into the center hole of the instrument’s base plate and tighten it securely.

Note: Do not carry the instrument while it is attached to the tripod.

Centering aligns the instrument’s central axis over the station point. This can be done using a plumb bob or the optical plummet.

Using a Plumb Bob:

1. Place the instrument on the tripod head and tighten the mounting screw.

2. Hang the plumb line on the hook of the mounting screw and adjust its length so the tip is approximately level with the station point.

3. Slightly loosen the tripod mounting screw. Carefully slide the instrument on the tripod head until the tip of the plumb bob is perfectly over the center of the station point. Confirm alignment by viewing from two directions at right angles to each other.

Using the Optical Plummet:

1. Place the instrument on the tripod and tighten the mounting screw.

2. Look through the optical plummet and turn the leveling screws to align the center mark (⊕) of the reticle with the station point image.

3. While supporting the tripod head, loosen the tripod leg clamps and adjust the leg lengths to center the bubble in the circular level. Then tighten the leg clamps.

4. Proceed to level the instrument using the plate level as described in the “Leveling” procedure.

5. Look through the optical plummet again to confirm the station point is still centered. If there is a slight displacement, loosen the tripod mounting screw and correct the position by sliding the instrument (not rotating). If the displacement is major, repeat the steps from step 2.

Leveling refers to the precise vertical alignment of the instrument’s axis using the plate level.

1. Loosen the upper plate clamp. Rotate the alidade (the upper part of the instrument) to position the plate level parallel with any two of the leveling screws (e.g., B and C).

2. Using these two screws, turn them in opposite directions to move the bubble to the center of the level.

3. Rotate the alidade approximately 90°. Move the bubble to the center of the level by turning the remaining leveling screw (A).

4. Repeat steps 1 through 3 until the bubble remains centered in both positions.

5. Rotate the alidade 180°. If the bubble in the plate level remains centered, leveling is complete.

6. If the bubble moves off-center, the plate level needs adjustment. Refer to the “CHECKING AND ADJUSTMENT of Plate Level” section.

Sighting involves aiming the telescope at the target, bringing the image into focus, and aligning it with the center crosshairs of the reticle.

Diopter Adjustment:

1. Direct the telescope towards a blank area, such as the sky or a piece of paper.

2. Look through the eyepiece and rotate the diopter ring until the reticle crosshairs are in sharp focus.

Elimination of Parallax:

1. Aim the telescope at your target.

2. Rotate the focusing ring to bring the target image into focus on the reticle crosshairs.

3. Move your eye vertically and laterally while looking through the eyepiece. If the target image appears to move in relation to the crosshairs, parallax is present.

4. If parallax exists, rotate the telescope focusing ring to eliminate this movement.

1. Sight a prism reflector: Sight the telescope crosshairs on the center of the prism reflector. When the reflected light is detected, the signal level will be indicated on the display.

2. Measure distances: Press the [MSR] or [TRK] key on the Basic Measurement Screen (BMS) or any other observation screen to take a measurement. To abort, press the key again or the [ESC] key.

• If the Average count is set to 0, measurements are taken continuously until stopped.

• If the Average count is 1-99, the averaged distance is displayed at the end. The header “SD:” changes to “SDx”.

• If the signal level is insufficient, the signal icon will blink.

3. Measurement mode settings: Hold down the [MSR] or [TRK] key to show the measurement mode settings. You can change the following:

• Mode: Precise (Prec) or Normal.

• Resolution (Reso): High or Low.

• Average count: 0 (Continuous) to 99.

• Target: Prism or Reflective Sheet (Sheet).

Press the [STN] key to display the menu. Select the desired method.

1. Known (Station with known coordinates or azimuth):

1. Press [1] for Known. Input the station point number/name. If the point exists, its coordinates are displayed. If new, you will input the coordinates.

2. Input the instrument height (HI) and press [ENT].

3. The Backsight menu appears. Choose either 1:Coord or 2:Angle.

• For Coord: Input the backsight point name and coordinates. Sight the backsight point and press [ENT]. The azimuth is calculated from the coordinates.

• For Angle: Input the backsight point name (optional) and then the backsight azimuth. Sight the backsight point and press [ENT].

2. 2-Point Resection:

1. Press [2] for Resection. Input the name/number of the first known point and its target height.

2. Sight the first known point and press [MSR] or [TRK].

3. Input the details for the second known point.

4. Sight the second point and measure. An observation error screen will display the difference in horizontal distance (dHD) and elevation (dZ).

5. Press [4:OK] or [ENT] to proceed. Input the instrument height to store the station data.

3. 3-Point Resection: Similar to 2-point, but you will measure angles to three known points to determine the station coordinates.

4. Default Station (Setup without coordinates):

1. Press [4] for Default. A default station point (ST) and backsight (BS) are provided.

2. Sight the backsight point and press [ENT]. The current horizontal circle reading (HA) is regarded as the backsight azimuth. No coordinate will be stored for this function.

Press the [S-O] key to display the stakeout menu. Select the desired method.

1. Ang-Dist (by Angle and Distance):

1. Press [1]. Input the horizontal distance (HD), vertical distance (dVD), and horizontal angle (HA) to the stakeout point.

2. Rotate the instrument until the difference in horizontal angle (dHA) is close to 0°00’00”.

3. Sight the target (prism) and press [MSR] or [TRK].

4. The screen will display the errors: dHA (horizontal angle difference), R/L (lateral error), and IN/OUT (longitudinal error). Guide the rodman to adjust the prism position until the errors are within tolerance (e.g., 0.000m).

2. XYZ (by Coordinates):

1. Press [2]. Input the point number/name to be staked. If the point is in the database, its details will be used. You can also search for points by code or radius.

2. The instrument displays the angle and distance to the target point.

3. Rotate the instrument until dHA is close to 0°00’00”.

4. Press [MSR] or [TRK] to measure to the prism.

5. The screen displays the errors. Guide the rodman to adjust the prism position until the displayed errors are negligible.

To record the staked-out point, press the [REC] key.

This procedure aligns the optical axis of the plummet with the instrument’s vertical axis.

Checking:

1. Place the instrument on the tripod. Leveling is not necessary for this check.

2. Place a thick sheet of paper with an ‘X’ marked on it on the ground directly below the instrument.

3. Look through the optical plummet and use the leveling screws to bring the image of the ‘X’ to the center of the reticle mark (⊕).

4. Rotate the alidade approximately 180°.

5. Observe the position of the ‘X’ image. If it remains in the center of the reticle mark, no adjustment is needed. If it has moved, an adjustment is required.

Adjustment:

1. Using the supplied minus screwdriver, turn the adjustment screws to move the reticle and align the ‘X’ marking halfway back to the center of the reticle mark. (For example, if the ‘X’ is at position X, and the reticle center is at O, move the ‘X’ to position P, which is the midpoint of the line connecting X and O).

2. Recheck the alignment by repeating the checking steps (3 to 5). Repeat the adjustment until the ‘X’ remains centered after rotating 180°.

Checking:

1. Set up and level the instrument.

2. In the face-left position, sight a target (P) positioned within ±45° of the horizontal plane and read the vertical angle (Vr).

3. Rotate the instrument to its face-right position and take another vertical angle reading (VI) of the same target P.

4. For a “Zenith” vertical angle setting, the sum Vr + VI should equal 360°. For a “Horizon” setting, the sum should be 180° or 540°. If it does not, an adjustment is necessary.

Adjustment (Calibration):

1. Press the [MENU] key and then [7] to enter the calibration screen.

2. Perform a face-left measurement to a prism and press the [ENT] key.

3. The screen will display the face-left values (Vr, Hr, Xr, Yr).

4. Perform a face-right measurement to the same prism and press [ENT].

5. The instrument will display the calculated correction values (ACV, ACH). If they are within tolerance, the process is complete. If “OVER” is displayed for any value, it is out of the acceptable range of ±6 minutes, and you should press any key to return and repeat the measurement.