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Operators’

Manual

Electronic Theodolite FET 420K

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Содержание FET 420K

Страница 1: ...1 Operators Manual Electronic Theodolite FET 420K ...

Страница 2: ... the carrying case to avoid extrusion crash and shock during the transportation Shockproof cushion should be necessarily put inside the carrying case during the long distance transportation 5 Clean the dirt on the surface of the organic glass and plastic by floss or brush after using the instrument Dry the instrument in time after use in the rain 6 Do not use harsh chemicals to clean the surface o...

Страница 3: ... for measurement 2 Power on 3 Battery state indication 4 Battery replacement 1 Left Right Observation 2 Target Aim 3 Horizontal Angle 0set 0SET 4 Measuring Horizontal and Vertical angle HR VH or HL V USAGE NOMENCLATURE and FUNCTIONS PREPARATION BEFORE MEASUREMENT ANGLE MEASUREMENT ...

Страница 4: ...asurement 8 Repeating Angle Measurement 1 Measuring distance by crosshair of the telescope 2 Incline Correction Function 3 Quadrant Buzzing Function 4 Illumination and Timing Close Function ANGLE MEASUREMENT OTHER FUNCTIONS FUNCTIONS SETTINGS ERRORS LIST ASSEMBLY and DISASSEMBLY of BASE PLATE CHECK and ADJUSTMENT TECHNICAL SPECIFICATIONS ...

Страница 5: ...surement can reach 20 Electronic Digital Theodolite FET 420K can be widely used in 3 4 class national triangle control measurement precise lead measurement engineering measurement for mine railway water conservancy and so on landform measurement and also could be used in the assembly of the large machinery facilities The displays are illuminated so as to make it convenient to operate in the darker...

Страница 6: ...IONS 1 Optical sight 2 Objective lens 3 Horizontal Clamp Knob 4 Horizontal Tangent Screw 5 Display 6 Operating keys 7 Tripod Base Plate 8 Carrying Handle 9 Handle Screw 10 Instrument Center Mark 11 Plate vial 12 Circular vial ...

Страница 7: ...7 1 Focusing Knob 2 Optical plummet 3 Communication Plug 4 Footscrew 5 Battery Compartment 6 Telescopes Eyepiece 7 Vertical Clamp Knob 8 Vertical Tangent Screw 9 Clamp of Tribrach ...

Страница 8: ...f repeated values Vertical angle Number of repeated measurements Average of repeated measurements Right horizontal angle Left horizontal angle 7 8 9 10 11 12 TILT F G REP BAT Incline compensator function Optional Function keys Angle unit GON Vertical slope State of repeated measurement Battery state indication ...

Страница 9: ...tch for display window REP Repeated angle measurement HOLD Hold horizontal angle V Vertical angle display Vertical angle percent display R L Option of left right horizontal angle 0SET 0SET for horizontal angle Power Switch v Move cursor leftward w Move cursor rightward r Alter the number cursor indicated ...

Страница 10: ...ghly level the instrument with the circular vial Use footscrew 1 2 to move the air bubble in the circular vial so it is centered left to right Use footscrew 3 to move the air bubble to the center of the vial d Fine tune level the instrument with the plate level Loosen horizontal clamp knob Turn the instrument to place the plate vial parallel with the footscrew 1 2 Center the bubble using these two...

Страница 11: ...Adjust plate vial if the bubble is not centered in step 4 e Centering the instrument using the optical plummet Adjust the eyepiece according to the observer s eyesight then move the instrument by loosening center screw until the image of the sign on the ground centered in the circle of the reticule Move the instrument carefully in case it appears incline f Final leveling of the instrument Level th...

Страница 12: ...ss a sensor through the zero pointer and start angle measurement The o point is set near the horizontal place so it is easy to set the vertical 0 by rotating the telescope The instrument can measure horizontal angle without 0set for the specification of the vertical plate For the instrument equipped with the automatic compensatory 0 set device the vertical specification can not be compensated 0 se...

Страница 13: ... battery Instrument will shut off automatically shortly Replace batteries immediately Battery operating time will vary depending on type and brand and quality of the battery We suggest always to secure for a 2nd standby battery set For any questions about replacing batteries see this chapter 4 battery replacement BATTERY STATE INDICATION ...

Страница 14: ...k to pull cover board away from the battery compartment Replace the old batteries by new ones Take care of correct polarity Snap the battery cover back into place c Mounting Battery Compartment Slip the projection on the bottom of the battery compartment into the slot Push the press button on top of the battery compartment until it clicks into place ...

Страница 15: ...izontal and vertical angle 2 Target aim Point the telescope at the brightness and focus the eyepiece until the crosshair can be seen clearly Turn the focusing knob in the direction facing the observer t hen focus in reverse direction Aim at the target coarsely using the coarse aiming device The definite space can be kept between the device and the observer when aiming coarsely Focus the target by ...

Страница 16: ...l angle can be set 0 at any time except the holding state HOLD key 4 Measuring horizontal and vertical angle HR V or HL V Horizontal rightward turning increment and Vertical angle measurement HR V OPETATING PROCESS DISPLAY Aim at target A using crosshair of the telescope Press 0SET key once to set reading ofhorizontal angle 0 00 00 Turn instrument clockwise and aim at the second target B to get it...

Страница 17: ...ransform mode HL into mode HR 5 Horizontal angle locked unlocked During the process of level observation press HOLD key once to keep the measuring angle After the horizontal angle held the value of the horizontal angle on the display window blinks There is no change to the horizontal angle even if the instrument is rotated When the direction aimed correctly press HOLD key once again to unlock the ...

Страница 18: ...of zenith distance vertical angle and height angle The vertical angle should be originally set according to the needs before the operation 6 1 ZENITH DISTANCE If choose 0 for the vertical angle as the zenith direction the measured vertical angle V is the zenith angle ZENITH DISTANCE V L 360 R 2 SPECIFICATON ERROR i L R 360 2 6 2 VERTICAL ANGLE If choose 0 for the vertical angle in left direction t...

Страница 19: ...OPE PERCENT MODE slope angle measurement Measuring in angle mode the vertical angle could be transformed into percent of grade The percent of grade value H D 100 The range of grade percent is from the horizontal direction to 45 OPERATING PROCESS DISPLAY Press key to switch from vertical angular measurement shown in degrees to percent Press V key once again back to the angular measurement shown in ...

Страница 20: ...o hold the horizontal angle and store in the instrument Double and average angle value will be shown on the display Repeat step according to measuring requires Back to normal angular measurement press FUNC key then press HOLD key The reading of horizontal angle could reach at least 2000 00 00 when measuring in Plate left or Plate right mode The five seconds reading could reach at least 1999 59 59 ...

Страница 21: ...g 0 Setting 1 Setting 2 Setting 3 3 Unit of angle measurement Change between DEG GON MIL DEG GON MIL DEG Setting 0 Setting 1 Setting 2 Setting 3 4 Auto shut off Set interval for automatic shut off off 10min 20min 30min Setting 0 Setting 1 Setting 2 5 Measuring mode for vertical angle Set 0 point of vertical angle Vertical angle 0 in horizontal Zenith Angle 0 in zenith Height Angle 0 in horizontal ...

Страница 22: ...v and w keys To change to correct parameter use key To store the settings press FUNC key first and then The settings will be stored even if the unit has been shut off Factory settings Minimum reading 10 Quadrant signal tone off Unit of angle measurement 360 Automatic shut off off Vertical angle measuring mode zenith angle Automatic compensation automatic compensation Data transmission off ...

Страница 23: ...erior error of the vertical angle measuring system If error is shown again instrument needs to be repaired E04 Difference between every value exceeds 30 during the angle repeated measurement press 0SET key and measure repeatedly E05 Times of angle repeated measurement exceed 15 press key and measure repeatedly E06 Errors during the process of the vertical angle 0set or adjusting 0set when the clam...

Страница 24: ...he screw after the adjustment The strength applied should be suitable because overtighten will damage the thread After the adjustment do repeat the inspection to make sure that the adjustment has been well done 1 Inspect and Adjust the Plate Vial Inspection Make the plate vial parallel with two footscrews among the three ones Center its bubble by adjusting the two footscrews Turn the instrument 18...

Страница 25: ...oceed with the following adjustment Adjustment There are three adjusting screws on the bottom of the circular vial When adjusting loosen the screw opposite to the bubble s moving direction one or two then tighten the rest screws along the bubble s moving direction to center the bubble The tightening strength of these three screws should be coincided Offset 1 2 Adjusting screw The bottom part Circu...

Страница 26: ... Adjustment is necessary if the point A moves deviated from the vertical hair Adjustment Turn counterclockwise and remove the reticle cover between the eyepiece and focusing knob This will expose four reticle fixing screws Loosen these four fixing screws equably by screwdriver Turn the reticle base around the visual axis to set point A on the vertical hair Tighten these four fixing screws equably ...

Страница 27: ...osshair of the telescope plate leftward Loosen the vertical braking knob Rotate the telescope around the horizontal axis 180 to aim it at the opposite direction Aim at target B with the same distance to target A Rotate the horizontal braking knob to turn the instrument 180 Aim at the target A then lock the knob Rotate the vertical braking knob to turn the instrument 180 Aim at the target C Target ...

Страница 28: ...nic incline sensor device which can compensate the vertical axis Check After mounting and leveling the instrument coincide the point of the telescope with the line between the center of the instrument and its any level screw Then tighten the horizontal braking knob Set zero for indication of the vertical plate after power on Tighten the vertical clamp knob and the instrument displays the current v...

Страница 29: ...set of vertical angle is displayed Rotate the telescope slowly in the horizontal direction of the left vertical plate until the vertical angle is displayed Press FUNC key once then press V key The instrument displays as follows Rotate the instrument and precisely aim at the clear and stable target A as high as the instrument in the distance Press 0SET key the instrument displays as follows Turn th...

Страница 30: ...ical plummet and the cross of the hair keep superposed when turning the collimator adjustment is unnecessary If not adjust it Adjustment Turn counterclockwise and remove the adjusting screw cover between the optical centering device and the focusing knob Fix the sheet of paper with the cross on it and mark the fallen point of the center mark each time when the instrument turns 90º shown as the ill...

Страница 31: ...on 0 4 L Length 157mm Angle measurement Method Incremental Diameter of circle 71mm Minimum reading 10 20 2 5mgon Angle measurement units 360º 400gon 6400mil optional Precision 20 5 mgon Level sensivity Plate vial 30 2mm Circular vial 8 2mm Compensator Electronic incline sensor Vertical angle compensation Compensation range 3 Precision 1 Optical plummet Image erect Magnification 3 Field of focus 0 ...

Страница 32: ...32 Display LCD Display 2 sides Data input and output Plug one RS232 Power supply Alkaline batteries 4 x 1 5 V AA Operating time 15 hrs Operating temperature 20 45 Weight 4 kg 09 2004 ...

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