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Nikon’s NPL-821 pulse laser station boasts a significant advance — a reflectorless EDM. This makes it possible to survey points previously inaccessible with conventional systems, thus offering a major improvement in field productivity. The NPL-821 drastically reduces time requirements for most jobs. It is an impressive fusion of Nikon’s world-renowned laser and optics technologies with the advanced, field-proven on-board data recording system of the DTM-800 Series. MAJOR FEATURES Coaxial focusing system reflectorless EDM Diameter of laser beam is etched into the reticle High-precision ±(3+3ppm x D)mm reflectorless EDM 0.5 sec. high-speed tracking measurement time Can be used with standard prisms and reflector sheets Long distance measurement possible (5km/16,400 ft. for a single prism) Offers the field-proven features of Nikon’s DTM-820: • Open system architecture (built-in MS-DOS® compatible system) • World industry standard PCMCIA memory cards • Large, high-contrast 256 x 80 pixel graphic LCD • Lumi-Guide tracking light • Advanced power management system • Unique security features including auto backup of all record data • DIN 3" (1mgon) accuracy with dual-axis tilt sensor • Powerful selection of on-board applications designed for practical field use • Easy-to-use, sophisticated on-board data recording

World’s first coaxial focusing system reflectorless EDM The NPL-821 combines the features of the DTM-820 field station with the world’s first high-precision coaxial, focusing, reflectorless EDM. Because measurement is achieved after focusing, the reflectorless EDM assures greater precision when the measurement beam is oblique to the target surface. Also, with the NPL-821, the diameter of the laser beam is etched into the reticle so that the size of the measuring beam can be evaluated, avoiding erroneous target recognition. This makes it easy to confirm that the beam does not extend beyond the target. Even when the beam does extend beyond the target, adverse effects on distance measurement accuracy are not nearly as great when compared to non-focusing devices. Naturally, this reflectorless surveying system offers benefits to a wide range of applications. These include surveying

of building walls, mine faces, street utilities, indoor locations and other inaccessible areas. Measurement of long distances is also possible when used with a prism. The focusing design assures a high degree of measurement precision at all times. And when used in combination with the optional application software, AP-800/FM-700/TDS 800, the NPL-821 offers an almost limitless range of uses.

Sample of AP-800 LCD screen

Sample of FM-700 LCD screen

Sample of TDS 800 LCD screen

Class I Laser The NPL-821 measures the flight time of a pulse laser to determine distance to the target. This is a Class I product, so there are no operational requirements for laser safety or supervision.


Two measurement modes To prevent erroneous measurement, two measurement modes are provided for different types of targets: prism and non-prism. The desired mode can be activated by a simple switch on the telescope. Mode status can be confirmed at a glance. Distance measurement accuracy PMSR mode ±(3+3ppm x D)mm m.s.e. MSR mode ±(5+3ppm x D)mm m.s.e. TRK mode ±(10+3ppm x D)mm m.s.e. Distance measurement range



N P L- 8 2 1

• Steel marking Marking on H-beams, steel piles, etc. • Slope determination Pile-driving • Surveying management Strip-mining, ore collection, mounding, partitioning • Tunnels Cavern measurement • Control of large machinery Shield machine control, positioning

Under good atmospheric conditions (no haze with visibility over 40km/25 miles)

Reflectorless mode With white target* 2 to 100m/7 to 330 ft. With reflector sheet (10 x 10cm) 2 to 500m/7 to 1,650 ft. With mini prism** 2 to 4,000m/7 to 13,150 ft. With single prism** 2 to 5,000m/7 to 16,400 ft. Prism mode With reflector sheet (10 x 10cm) 2 to 200m/7 to 650 ft. With mini prism** 2 to 1,500m/7 to 4,950 ft. With single prism** 2 to 2,000m/7 to 6,600 ft. * The term white target here refers to a material which has a reflectivity of more than 90%. ** Distance ranges are given for Nikon specified prisms.

The NPL-821 reflectorless EDM cannot measure all surfaces in all situations. However, greater range and flexibility can be obtained with paper, spray, tape and spot-paint targets. We recommend the use of reflective sheets with difficult-tocapture targets like wire fences, for example.

Concrete field applications for reflectorless EDM Surveying • Architectural surveying Building periphery, heights, positions (3D measurement) • Structural measurement Bridges, towers • Real estate measurement Building line identification • Tunnels Internal section displacement, shield machine control • Measurements in inaccessible areas Dangerous sites, high-temperature targets • Monitoring Distortion monitoring for large structures Instrumentation • Measurements in inaccessible places Dangerous sites, high-temperature targets • Monitoring Distortion monitoring for large structures • Control of large machinery Positioning • Shipbuilding Cell positioning for large vessels Civil engineering and construction sites • Chalk-lining Framework positioning, steel reinforcement alignment • Partition chalk-lining Wall position, partition positioning

Distance range in reflectorless mode

Unit: m

(without prism/reflector sheet) Traffic sign White paper

Electric wire (dark)


Metal nail


Stone (bright color)

Tree trunk

Wood (rough surface)

Broadleaf foliage

Utility pole Painted surface

Distance range changes according to the surveying conditions




N P L- 8 2 1

Specifications Telescope

Angle measurement

Dual-axis tilt sensor

Distance measurement Distance range with Nikon specified target and prism


Measurement intervals

Least count

Temperature compensation range Barometric pressure compensation range Prism offset correction Laser source Lumi-Guide

Leveling base Level vial sensitivity Front display/key Rear display/key Connections in the base of instrument Communications On-board Ni-MH battery BC-80

External Ni-Cd battery B4E

Internal computer

Environmental performance Dimensions Weight

Tube length Magnification Effective diameter of objective Image Field of view Resolving power Focusing distance Reticle illumination Reading system Circle diameter (reading) Minimum display increment (360°) (400G) (MIL6000/MIL6400) DIN18723 accuracy Method Compensation range Setting accuracy

155mm/6.1 in. 26x (16x, 32x with optional eyepiece) 40mm/1.57 in. (50mm/1.97 in. for EDM) Erect 1°30' 2.5" 2.0m/6.56 ft. to infinity 3-level variable Photoelectric incremental encoder (Diametrical detection for H/V circles) V: 76mm/2.99 in. (67mm/2.64 in.), H: 88mm/3.46 in. (79mm/3.11 in.) 1"/5" 0.2mgon/1mgon 0.005mil/0.02mil 3"/1mgon Liquid-electric detection ±3' ±1"/±0.2mgon Under good atmospheric conditions (no haze with visibility over 40km/25 miles)

Reflectorless mode With white target With reflector sheet (10 x 10cm) With mini prism With single prism Prism mode With reflector sheet (10 x 10cm) With mini prism With single prism Precise mode (PMSR) Normal mode (MSR) Tracking mode (TRK) Precise mode (PMSR) Normal mode (MSR) Fast tracking mode (TRK) Precise mode (PMSR) Normal mode (MSR) Tracking mode (TRK) (hPa) (mmHg) (in.Hg)

Light source Visible range Positioning accuracy Beam spread Plate level vial Circular level vial Type Heater Type Type Baud rate Output voltage Continuous operation time Recharge time Discharge time Output voltage Continuous operation time Recharge time Operating system Internal data backup memory External card drive Operating temperature range W x D x H (approx.) Main unit (approx.) Battery (BC-80) (approx.) Battery charger (approx.) Carrying case (approx.)

2 2 2 2

to to to to

100m/7 to 330 ft. 500m/7 to 1,650 ft. 4,000m/7 to 13,150 ft. 5,000m/7 to 16,400 ft.

2 to 200m/7 to 650 ft. 2 to 1,500m/7 to 4,950 ft. 2 to 2,000m/7 to 6,600 ft. ±(3+3ppm x D)mm m.s.e. ±(5+3ppm x D)mm m.s.e. ±(10+3ppm x D)mm m.s.e. 7.5 sec. (initial 8.5 sec.) 2.5 sec. (initial 3.5 sec.) 0.5 sec. (initial 1.5 sec.) 0.2mm/0.001 ft. (switchable to 1mm/0.002 ft.) 1mm/0.002 ft. 10mm/0.02 ft. –40°C to +55°C/–40°F to +131°F 533 to 1,332hPa (1hPa step) 400 to 999mmHg (1mmHg step) 15.8 in.Hg to 39.3 in.Hg (0.1 in.Hg step) –999 to +999mm (1mm step) Class I (wavelength 850nm) High-luminescence LED Over 100m/330 ft. Approx. 6cm/2.4 in. at 100m/330 ft. About 1.5° (2.6m/8.5 ft. at 100m/330 ft. point) Detachable 30"/2mm 10'/2mm Graphic (256 x 80 pixel) LCD with 7-level adjustable backlight illumination and 20 keys Automatic sensor control 16-character x 4-line dot matrix LCD with backlight illumination and 5 keys RS-232C 19,200 max. ASYNC 7.2V DC, rechargeable 3.8 hours/approx. 1,680 measurements (continuous distance/angle measurements) 7.8 hours (angle measurement only) 1.5 hours quick recharge with Charger Q-75U/E Approx. 7.5 hours with Q-75U/E 8.4V DC, rechargeable 8.0 hours (continuous angle/distance measurements with display heater off) 12.0 hours (angle measurement only with display heater off) 8 hours recharge with Charger Q-B4U/E MS-DOS ® compatible 128K One –20°C to +50°C/–4°F to +122°F 166 x 168 x 365mm/6.5 x 6.6 x 14.4 in. 5.9kg/13.0 lbs. (with BC-80 battery ) 0.6kg/1.3 lbs. 0.6kg/1.3 lbs. 3.4kg/7.5 lbs.

Specifications and equipment are subject to change without any notice or obligation on the part of the manufacturer. June 2000 ©2000 NIKON GEOTECS CO., LTD. NIKON GEOTECS CO., LTD. Technoport Mitsui Seimei Bldg. 16-2 Minamikamata 2-chome, Ota-ku, Tokyo 144-0035, Japan Phone: +81-3-5710-2511 Telefax: +81-3-5710-2513

NIKON EUROPE B.V. Schipholweg 321, 1171 PL Badhoevedorp, The Netherlands Phone: +31-20-4496222 Telefax: +31-20-4496298

NIKON INC. Instrument Group, Surveying Dept. 1300 Walt Whitman Road, Melville, NY 11747-3064, U.S.A. Phone: +1-631-547-4200 Telefax: +1-631-547-8669

Printed in Japan

Code No. 2CE-HVXH-1 (0006-10) K




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