. Applications The NETH503 series Electronic Theodolite has an optical incremental grading system which features digital angle measurements. It can achieve measurement, calculating, display and memory etc. It can display measuring results of horizontal and vertical angle at the same time. Furthermore, vertical angle can refer to zenith angle or grade and so on.
. Introduction 2.1 Instrument encasement Please refer to the following figure to encase. See also packing list. 1. Instrument 2. Instruction manual 3. Alkaline Battery pack 4. Adjusting tools 5. Rain cover 6. Silica gel Warning! Please loosen the clamp system when the instrument is in the case Fig.
2.2 Nomenclature Carrying handle Optical sight Battery clamp Objective lens Battery pack Vertical motion clamp Plate level Vertical tangent knob Keyboard Display Circular level Fig.
Handle fixing screw Focusing ring Telescope eyepiece Horizontal motion clamp Horizontal tangent knob Optical/laser plummet Leveling screw Tribrach Fig.
2.3 Display Fig.
2.
Lock lever Fig. 5 Fig. 6 3. Battery 3.1 Mounting the battery Insert the battery by aligning the battery guide with the guide hole on the instrument. Press the top of the battery until you hear a click. 3.2 Removing the battery Push the lock lever downward and pull out the battery. 3.3 Battery indicator display A battery figure is displayed at bottom right corner of the LCD panel. All black indicates that the battery is full.
AA battery Battery pack Fig. 8 3.4 Replace the AA alkaline batteries Open the cover of the AA battery pack, take out the old batteries and put 4 new AA alkaline batteries as illustration shows in the direction of + and -, and then close the cover. Note: 1. Replace all 4 batteries with new ones at the same time. Don’t mix the old batteries with new ones. 2. If the instrument is not used for a long period of time, please remove the batteries.
Screw A Screw B Fig. 9 Screw C Screw A Screw B Fig. 10 4. Surveying preparation 4.1 Setting up the instrument (1)Setting up the tripod Adjust the tripod legs so that a height suitable for surveying is gained. Tighten the lock screws. (2)Setting up instrument on the tripod Put the instrument on the head and attach it to the base plate by the center screw. 4.2 Leveling the instrument (1)Leveling with the bubble By adjusting leveling screws A and B, position the bubble in the center of vial(Fig.9).
Screw B Screw A Plate level Bubble Screw C Fig. 11 Screw A Screw B Screw C Fig. 12 Adjust the leveling screw C, position the bubble in the center of circle. (2)Leveling precisely by the Plate level. Loosen horizontal clamp screw, Place the plate level in parallel with a line joining leveling screws A and B. Adjust the leveling screws A and B, position the bubble in the center of the plate level. (Fig11) Loosen horizontal clamp screw, rotate the Plate level through 90°around the vertical axis.
Cross mark Plummet center Fig. 13 4.3 Centering 4.3.1 Centering with the optical plummet 4.3.1.1 Three-jaw tribrach Rotate the focusing knob of the optical plummet and adjust the focus to the ground mark point. Then loosen the center screw of the tripod. Look through the optical plummet, and move the base plate on the tripod head until the center mark coincides with the ground mark point. Tighten the center screw.
4.4 Focusing and Sighting Telescope plate (1) Reticle Cross Hairs Point telescope to sky or a uniformly light surface, turn eyepiece until cross hairs are sharp and black. The dioptric scale now indicates the correct setting for the observer’s eye. (2)Target Image Focusing Loosen horizontal and vertical clamps. Point telescope to target by means of optical sight. Fig. 16 Tighten clamps. Look through telescope eyepiece and turn focusing ring until target is seen.
5. Setting mode Before beginning any work with this instrument, you must set the parameters, but in the future, if your demand doesn’t change, it will not be necessary to set again. 5.1 Enter into the setting mode Press the key and R/L key to turn on the power. The current data will be shown, and the first digit will be blinking. 5.
Digit No. 1 2 Setting value Description On/off of horizontal angle absolute encoder mode On/off of vertical compensator 0 1 Off On Off On Off On Set power auto-off when it is 3 without any operation for 10 minutes Digit No. Description 4-5 Choose minimum reading 6-7 Choose baud rate Setting value 00 01 10 11 1″ 5″ 10″ 20″ 0.
5.3 How to set the selecting mode The all parameters could be set in the same interface due to the setting mode is used code. [Example] Power auto-off; minimum reading: 5″. Operating procedure Operation Display 1.Turn the power ON and pressing Power on [R/L] key. + The current data is shown with the [R/L] 0100000 Digit No.1 Digit No.7 first digit is blinking. 2. Press [▲] key and make the digit [▲] 0100000 No. 3 blinking Blinking 3.
Operating procedure Operation 4. Press [▲] key and make the digit [▲] Display 0110000 No. 5 blinking Blinking 5. Press [ ] key to set “1” [ ] 0110100 Vz SET 0 6. Press [ ], the instrument enter into [ ] HR 000°00′00″ angle measurement mode NOTE: 1. Pressing [▲] key, blinking digit moves towards the right direction 2. Pressing [ ] key, the blinking digit shows “0” or “1” After these operations, the minimum reading of current setting is 5″, and power auto-off setting is on.
6. Instrument operation 6.1 Switch on（ ） Press the key. All the segments on LCD will display. Release the key, and the instrument will enter into initialization mode. Rotate the telescope up and down to initialize the vertical angle. If the horizontal angle is in absolute encoder mode, then turn the instrument one circle on horizontal direction to initialize it, and enter into angle measurement mode. It will display horizontal angle, vertical angle, battery indicator, series number and so on.
Vz: 075°52′37″ HR: 175°12′03″ Press R/L key Vz: 075°52′37″ HL: 184°47′ 57″ Flow chart for horizontal R/L 6.3 Switching horizontal angle right/left（R/L） After instrument is switched on and initialized, the horizontal angle display is “HR xxx°xx′xx″”, it shows horizontal angle and will increase by turning the instrument clockwise. (“HR” mode) Press the R/L key and release it.
Vz: 058°52′20″ HR: 175°12′00″ V%: 0.6039 HR: 175°12′00″ Flow chart for Vertical angle mode 0° 270° 90° 180° Zenith mode 100% 100% 6.5 Switching vertical angle zenith/grade（ V/%） (1)Zenith mode（Vz） After the instrument is switched on and initialized， vertical angle measurement mode enters the Zenith mode automatically. The angle value range is 0°/ 360°. (2)Grade mode（V%） Press the V/% key and release it under the Zenith mode (Vz), vertical angle measurement becomes grade mode (V% ).
Vz: 075°52′37″ HR: 175°12′03″ Press R/L key Vz: 075°52′37″ HR: 175°12′03″ Hold Press R/L key Vz: 075°52′37″ HR: 175°12′03″ Flow chart for hold angle 6.6 Holding the horizontal angle value and set to arbitrary value（ HOLD） ⑴Holding the horizontal angle value Press the HOLD key and release it，the buzzer will ring, the LCD displays “Hold” at the last line. At this status the horizontal angle reading remains unchanged when you rotate the alidade.
Vz: 075°52′37″ HR: 175°12′03″ Press Shift key Vz: 075°52′37″ HR: 175°12′03″ Shift Flow chart for shift key function mode 6.7 Enter into the second function key mode Some keys on the board have two functions. The first function is marked on the key, and the second function is marked above the key. At normal mode, the first function is active, and at shift mode, the second function is active. Press the SHIFT key and release it. The buzzer will ring, and the LCD display “Shift” on the last line.
Vz: 075°52′37″ HR: 175°12′03″ Press Shift key Vz: 075°52′37″ HR: 175°12′03″ Shift Press R/L key Vz: 083.9152 g HR: 194.5781 g Shift the instrument come into normal mode, and the illumination will still be on. Follow the same way to turn off illumination. 6.9 Select angle unit 360°/ 400gon（UNIT） The default setting of angle measurement is in 360°system. The procedure of changing it to 400gon system is as follows: Press SHIFT key to enter the second function key mode, and the LCD will display “Shift”.
7. Angle measurement 7.1 Horizontal angle measurement (1)Switch on, rotating the telescope and alidade to initialize the instrument.( (2)Check battery indicator. (3)Check LCD illumination is ON or OFF. (4)Select direction of angle measurement (HR or HL). (5)Select unit of angle (360°or 400gon). (6)Set horizontal angle to 0°or set to arbitrary value.（0SETor HOLD） (7)Aim target. (8)Read the displayed value. (9)Go on next measurement item. (10)Complete measurement and turn off.
7.2 Vertical angle measurement (1)Switch on, rotating the telescope in order to initialization. ( ) (2)Check battery indicator. (3)Check LCD illumination is ON or OFF. (4)Select unit of angle (360°or 400gon). (5)Select vertical angle measurement mode (zenith Vz, grade V%). (6)Aim target. (7)Read the displayed value. (8)Go on next measurement item. (9)Complete measurement and turn off. ( ) Note: Both of horizontal and vertical angle can be measurement at the same time.
Stadia hairs 8.Distance measurement with the stadia hairs l Staff l L=100 x l Fig. 17 Distance measurement could be done as follow: (1)Set the instrument and level it at the measurement station. (2)Set the staff in the Station point. (3)Readout the distance (l). (4)Calculation the distance from target to instrument L=100×l. Note: l: Distance between top line and bottom line in the cross hairs. L: The distance from target to instrument. 100: Multiplication factor of telescope.
Screw A Screw B Plate level Bubble Mark Screw C Bubble Adj-screw Turn the instrument 180° 9.Check and adjustment 9.1 Check/adjustment the plate level Check (1)Set-up the instrument on stable equipment such as a tripod or adjustment platform. (2)Leveling the instrument, place the plate level parallel to a line of two leveling screws. Adjust the leveling screws and position the bubble in the center of the plate level. (3)Rotate the instrument through 180° (200g), confirm if the bubble is in the center.
Adjustment (1)Set-up the instrument on stable equipment. (2)Level the instrument. (3)Rotate instrument, place the plate level parallel to a line of two leveling screws. Adjust the leveling screws, position the bubble in the center of the plate level. (4)Rotate the instrument 180° (200g),bring the bubble half way back to the center by adjusting the bubble adjustment screw with the adjusting pin. (5)Repeat the procedures of (3) and (4) until the bubble always in the center by rotating the instrument.
9.2 Check/adjustment the circular level (1)Set-up the instrument on stable equipment and fix it. (2)Leveling the instrument accurately by plate level; Confirm if the bubble of circular level is in the center. No adjustment is necessary if the bubble of the plate level is in the center. If the bubble moves, proceed with the following adjustment. Adjustment (1)Set-up the instrument on stable equipment and fix it. (2)Leveling the instrument accurately by the plate level.
9.3 Optical sight Check (1)Set-up the instrument on tripod and fix it. (2)Place a cross-hairs target from instrument 50m. (3)Aim at the cross hair on the target through telescope. (4)Confirm if optical sight aim at the cross hair. No adjustment is necessary if the optical sight aim at the cross hair. If the cross hair moves, proceed with the following adjustment. Adjustment (1)Set-up the instrument on tripod and fix it. (2)Place a cross-hairs target from instrument 50m.
9.4 Optical Plummet Check (1)Set-up the instrument on tripod and fix it. (2)Place a cross-mark under the instrument directly. (3)Rotate the leveling screws, make the intersection of cross hair superpose to the Point. (4)Rotate the instrument 180°(200g), Confirm if intersection of cross hair superpose to the Point. No adjustment is necessary if the intersection of cross hair superpose to the Point. If not, proceed with the following adjustment. Fig. 21 (1)Set-up the instrument on tripod and fix it.
A A′ A A′ Focusing ring Adjustment screw Eyepiece Fig. 23 9.5 Vertical Hairs of telescope’s reticle Check (1)Set-up the instrument on tripod and level it accurately. (2)Place a point mark A from instrument 50m. (3)Aim at the point mark A, turn the vertical tangent screw. If point A moves along the vertical hairs, no adjustment will be necessary. If point A moves deviation from the vertical hairs, proceed with the following adjustment.
For example: Face left angle H(l)=000°00′00″ Face right angle H(r)=180°00′30″ Horizontal collimation error C is: C=(H(l) – H(r)±180°)/2 = -15″ If C is out of tolerance, need to adjust Focusing ring Adjustment screw Eyepiece Fig. 24 9.6 Horizontal collimation error C Check (1)Set-up the instrument and level it accurately. (2)Aim at the cross-hairs of collimator or the obvious target at a distance. Get the face left angle reading H(l) and the face right angle reading H(r).
Switch on Vz: SET HR: SET 0 0 Press and holding down SHIFT key, about 2 seconds laser, release it Vz: SET 0 H R: 1 Initialize vertical angle and aim target, press and hold down ① key, about 2 seconds later, release it 9.7 Check and adjustment of the vertical index error i Check (1)Set-up the instrument on tripod or platform and level it accurately. (2)Aim at the cross-hairs of collimator or the target which is not apart away from horizontal line ±10°.
vertical index error adjustment mode. The instrument displays vertical angle on the second line and “1” on the third line. (3)Rotate the telescope up and down to initialize the Turn 180°and aim the same vertical angle, aim the cross-hairs of collimator or the target.
10. Assembling and disassembling for three-jaw tribrach Instrument Tribrach Clamp button Fixed screw Relax Clamp knob Lock screw Fig. 25 Disassembling (1) Tighten the fixed screw. (2)Rotate the clamp knob 180°(200g) anticlockwise. (3)One hand hold up the tribrach, another hand hold the carry handle of the instrument and lift out the instrument from the tribrach. Assembling (1)Confirm the tribrach clamp knob is loosened.
11. Optional Accessories Diagonal eyepiece FJ13A-1 Eyepiece cover Clamp cover Eyepiece Fig. 26 The telescope diagonal eyepiece can be applied to the instrument in order to observe the larger elevation and zenith. Assembling (1)Loosen the eyepiece clamp cover counter-clockwise, then take out the eyepiece. (2)Put the diagonal eyepiece into corresponding eyepiece site, tighten the eyepiece clamp cover clockwise.
12. Specifications NETH503 Objective lens: 42 mm Magnification: 30x Image: Erect Field of view: 1°20′ Minimum focus: 2m/1m*(selectable) Accuracy: 5″ Minimum reading: 1″(0.
Serial interface: RS232C Standard Warranty Terms The warranty period for the NETH503 is 12 months from the date of purchase. Northwest Instrument, Inc. (Seller) warrants that this instrument made by Northwest Instrument is free from manufacturing defects in materials and workmanship. For claims to be made under this warranty the instrument must be inspected by the seller and the defect must be proven to Seller’s satisfaction.
Limitations and Exclusions A. This warranty does not apply to instruments subject to negligence, abuse, accident, improper operation, damaged in transit or damaged due to unauthorized service repairs made by someone other than Northwest or any other Northwest authorized service personnel. Circumstances beyond Northwest Instrument’s control cannot be warranted. B.
