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DISTANCE METER

SHORT-RANGE DISTANCE METER



Kern & Co., Aarau, Switzerland
Model : DM 501
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This Kern DM 501 short-range electro-optical distance meter has the ability to conveniently snap on to the telescope of a Kern theodolite such as the Kern K1-SE

The distance meter slots into holes on the objective side and rests on adjustable screws on the eyepiece side. It is pressed on these screws by springs on the other side. The adjustment of the distance meter's line of sight (to that of the theodolite) was with the aid of these screws, on the eyepiece side.
The EDM consists of two telescopes, a transmitting telescope and a receiving telescope with objective diameters of 28 mm each, and an infrared filter and a diaphragm (for adjustment of the signal strength) is mounted inside the receiver optics. Both telescopes are small enough to still allow the main telescope of the theodolite to rotate a complete revolution about the horizontal (trunnion) axis.
The instrument uses a digital phase measuring method with an infrared 900 nm Ga-As-Diode (Gallium-Arsenide-Diode) as its radiation source. The modulation fine measurement frequency is 15 MHz and the power requirement for distance measurement is 11 Watts. The maximum range of distance measurement for the instrument is approximately 1.0 kilometre using a single prism, and 1.6 kilometres using a triple prism. The standard error of distance measurement is ±(5mm+0.000005D), where D represents the distance measured in kilometres. The instrument also operates in tracking mode, where the slope distance is displayed every 2 seconds.
The power is provided through the wiring for the circle illumination, with the battery attached to the stationary base of the host theodolite. The energy is supplied through slip rings on the axes and contact tongues on the telescope. This means that the theodolite can be used without interference by cables.

Instrument includes a set of 4 reflectors, three of which can be joined together to form a triple reflector (refer to left image)
Also included is a battery power supply set
Weight of instrument is 1.6 kg
Catalogued in 2000

MEDIUM-RANGE DISTANCE METER

AGA, Sweden
Model : Geodimeter 14
Length 220mm, Width 190mm, Height 87mm (excluding handle)

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This Geodimeter 14 is a compact and lightweight electro-optical distance measuring instrument intended for distances up to 10,000 metres, and can be mounted on the telescope of most types of theodolites.
The measuring is made by means of infrared invisible light (IR-GaAs light emitting diode) with an effective light wavelength of 0.91 micrometres. To make the target easy to find, the instrument is directed with the aid of an audio-signal and a control instrument with pointer deflection. There is also a mode selector switch with three positions. When maximum accuracy is wanted, a measurement is first made with the switch in position 1 (Ph 1) and then in position 2 (Ph 2), whereafter the mean of the two results is calculated. The expected accuracy when using this type of measurement is ±(5 to 30 mm + 3 ppm). The third position (Auto) is used when the signal conditions are good and when it is important that the measurement can be done quickly. The accuracy of auto measurement is about ±(5 mm + 10 ppm). The measuring time per distance could be close to 15 seconds in 'Auto' mode and about 40 seconds per phase when using the 'Phase' mode.
The distance meter is equipped with a control knob with which the instrument can be adjusted for the greatest possible accuracy for existing measuring conditions. In addition, the atmospheric correction can be determined (based on measured temperature and pressure) with the aid of a correction scale and the correction factor is dialled in on the instrument, so that the display shows the corrected measuring value.
The maximum effective range of the distance meter using one prism, 3 prisms and 16 prisms is 4 kilometres, 6 kilometres and 10 kilometres respectively, during good atmospheric conditions. The diameter of the objective aperture is 60 mm and the shortest measuring distance is 0.2 metres. A 6V battery is required to operate the instrument and its power consumption is approximately 20 Watts

Weight of instrument is 2.5 kg

ELECTRONIC TACHEOMETER
Hewlett-Packard (USA)
Model : HP 3820A

Length 239mm, Width 162mm, Height 298mm
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This Hewlett-Packard HP 3820A Electronic Tacheometer is a combination of a digital theodolite for angle measurements, an EDM instrument for distance measurements and a microcomputer for basic survey calculations such as determining height differences and calculating horizontal distances from observed slope distances and zenith angles. The microcomputer also has the responsibility of monitoring the measuring systems and preparing the measured values for display. The measured distances can be displayed in either metres or feet.
The optical system serves as transmission and receiving optic, as well as the aiming telescope. The plate and index levels usually found on theodolites, are replaced by a dual-axis level sensor. This dual-axis level sensor automatically checks for dislevelment of the vertical axis and applies the necessary corrections. The plumbline is given by a mercury horizon, dampened with silicone oil.
The instrument uses a digital phase measuring method with an infra-red 830 nm Ga-Al-As-Diode (Gallium-Aluminium-Arsenide-Diode) as its radiation source. The modulation fine measurement frequency is 15 MHz and the power requirement for distance measurement is 15 Watts. The maximum range of distance measurement for the instrument is approximately 1 kilometre using a single prism, and 5 kilometres using 6 prisms. The standard deviation of distance measurement is ±(5mm+0.000001D), where D represents the distance measured in kilometres.
The magnification of the telescope is 30x, the diameter of the objective lens of the telescope is 66 mm, and the shortest pointing (minimum focusing) distance is approximately 5 metres. The instrument uses the method of electronic 'decoding' for circle reading, and provides horizontal and vertical accuracies of ±2" and ±4" respectively. The measured angles can be displayed in either degrees or grads

This is one of the first instruments with a 'dual-axis' level sensor. Instrument was purchased by the School of Surveying, UNSW, in the late 1970's

Upright telescope image
Weight of instrument is 11 kg
In a hard plastic case

SHORT-RANGE DISTANCE METER

Hewlett-Packard (USA)
Model : HP 3800B

Length 330mm, Width 260mm, Height 145mm
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This Hewlett-Packard HP 3800B short-range distance meter is an electro-optical measuring instrument capable of measuring distances up to 3 kilometres using three reflectors (in ideal conditions).
The distance meter itself is supported by a yoke which allows it to rotate either upwards or downwards about the horizontal axis, and it can also be removed from this yoke by unscrewing the holding screw. Similar to a theodolite, the yoke also features vertical and horizontal clamps and tangent screws for accurate pointing of the instrument.
The objective end of the distance meter features the 'transmitter' and 'receiver' lenses. The transmitter lens has a smaller diameter and is positioned inside the receiver lens. The sighting telescope, located on top of the instrument, is used to point the instrument at the reflector. The instrument is pointed at the reflector by sighting through the telescope and adjusting the horizontal and vertical tangent screws until the cross hairs intersect a point approximately 70mm above the reflector. The telescope features internal focusing, stadia cross hairs and 18x magnification.
An external power unit can be attached to the instrument, which operates from an internal 12 volt rechargeable battery good for 8 hours of operation when fully charged. The precision of distance measurement is ±(3mm+0.00001D), where D represents the distance measured in kilometres.
When measuring long distances during poor atmospheric conditions, the measuring time of the distance meter can be as long as 2 minutes. The distance measurement is not fully automatic. The operator has to zero an ammeter at different frequencies

Weight of distance meter is 7.7 kg
Weight of external power unit is 6 kg

MICROWAVE DISTANCE METER

Tellurometer, South Africa
Model : MRA 101
Length 381mm, Width 368mm, Height 184mm
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This Tellurometer Model MRA 101 is a long-range microwave distance meter capable of measuring distances up to 50 kilometres. Due to its large parabolic antenna (330 mm in diameter) located on the transmitter end, and a beam width of only 6º, it is particularly useful for accurate short-range urban applications, since the reflections from passing traffic are held to a minimum. Long range performance is also of a high standard and multipath reflections are reduced.
Two identical Tellurometer units are used when measuring a line, with one placed at one end of the line to be measured and the other at the opposite end. These two units are known respectively as the "Master" and the "Remote" units and each one can be switched to operate as either unit.
The instrument uses microwaves (radio waves) of 10 centimetre wave lengths for distance measurement, which is read at the master station, with the read-out being calibrated directly in units of length. The read-out tuning knob is rotated until the pointer on an adjacent meter is brought to its centre-scale position. The actual distance being measured is then read from a circular scale in metres (coarse reading) and, by means of a vernier, in centimetres (fine reading). By operating only one switch and a read-out control, the operator can obtain a distance reading in about a minute. In favourable circumstances, a distance precision of ±(1.5cm+3ppm) can be obtained.
A continuous microwave carrier wave, variable within the frequency range 10.05-10.45 GHz is transmitted by the master instrument and is produced by an electronic component known as a klystron. The average power consumption of the instrument is 3.2A at 12 Volts. It's modulation frequency is 7.5 MHz.
An interesting and highly efficient feature of this Tellurometer is that it incorporates a duplex, frequency modulated speech facility, allowing communication between the two stations simply by flicking a switch labelled "speak" located on the right of the control panel and using the headset provided with the unit.

A glass-fibre carrying case (Length 476mm, Width 406mm, Height 216mm)

Instrument features a 'headset' for communication (pictured in image above)
Weight of instrument is 7.3 kg
Weight of carrying case is 4.1 kg

PRECISION DISTANCE METER
Tellurometer, South Africa
Model : MA 100

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This precision electro-optical Tellurometer Model MA 100 is specifically designed for short-range high-accuracy distance measurement. The instrument can be used for precise traversing, constructional surveys, mining surveys, cadastral surveys, control for aerial photography and valuation surveys in urban and semi-urban areas. It is capable of measuring distances up to 3 kilometres or more with an instrumental accuracy of a few millimetres. Meteorological errors will not contribute more than 2 parts per million of the range being measured, hence the overall accuracy can be expected to vary from a few millimetres at short range to about 1 cm at 3 kilometres.
The instrument makes use of phase comparison techniques to determine the distance and the actual phase measurement is performed digitally using a pulse counting system and a clock oscillator. A measuring frequency of about 75 MHz is modulated on to a light source (Gallium Arsenide diode) emitting at near infra-red with wavelengths of 0.92 micrometres and the returned light is detected by a photo diode.
The instrument consists of a magnesium alloy barrel containing the optics, and is mounted on a cast alloy yoke above the instrument body which contains the electronic circuitry, control panel and readout. The optical barrel is completely sealed and has a cartridge of silica gel which provides further protection against possible ingress of moisture. Vertical clamp and tangent screws are mounted in the yoke while the horizontal clamp and tangent screws are an integral part of the azimuth mount assembly below the instrument body. The instrument is carried by means of a heavy duty leather strap which is slung across the yoke.
A telescope, used for lining up on the aiming target, is usually mounted at eyelevel on top of the optical barrel, however, it is unfortunately missing from the collection. A data output socket on the front panel provides range information in binary-coded-decimal form for direct input into a tape punch or other recording device.
For distance measurement, under favourable atmospheric conditions, 1 km can normally be measured using a triple prism reflector and 2 km distances require four triple prism reflectors. The standard deviation of a single determination of distance due to instrumental errors is 1.5 mm and the scale error due to atmospheric refractive index determination is usually less than ±2 ppm.
The instrument requires a 12 V D. C. power supply and the average power consumption of the
distance meter is 15 W

Total weight of instrument (without case) is 17.3 kg

MICROWAVE DISTANCE METER
Tellurometer, South Africa
Model : CA 1000

Length 305mm, Width 145mm, Height 76mm
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This Tellurometer CA 1000 is an electronic microwave distance measuring system capable of measuring distances from approximately 50 metres to 30 kilometres.
The complete system comprises of two instruments, termed the "Master" (S/N 6250E) and the "Remote" (S/N 6249E) which are tripod mounted at each end of the line to be measured, and the slope distance is obtained from readings taken by the operator of the Master instrument only. The two images shown above are separate views of the "Remote" unit. Both units radiate an X-band microwave carrier tuneable between 10.10 and 10.45 GHz which is frequency modulated in the 19 to 25 MHz range. The Remote unit receives the transmission and re-transmits it to the Master, which measures the phase difference between the transmitted and received signals.
The size, weight and power consumption of the CA 1000 has been kept to a minimum due to the use of miniature, solid-state components in the design. An optional battery tray can be mounted integrally with the instrument, providing power for about 200 measurements between charges. The operating procedure of this instrument has been made as simple as possible since there is no necessity, except under abnormal circumstances, for any tuning to be carried out by the Remote operator, as automatic frequency tracking is employed.
An interesting and highly efficient feature of this Tellurometer is that it incorporates a duplex speech facility, allowing radio communication between the two instruments during measurements, and thus eliminating the necessity for "walkie-talkies" or field telephones. Also, there is no warm-up period required, since the quartz-oscillator inside the instrument is largely independent of the temperature, and therefore does not need to be thermostat controlled.
The unusually shaped, four-sided horn antenna attached to the end of the distance meter, on the opposite side of the control panel, is the standard range (10 km) microwave antenna, which is used to project the microwaves from one instrument to the other. There is also a long range (30 km) horn antenna available with the instrument.
The probable error of a single determination of distance is less than 1.5 centimetres, and the scale error due to atmospheric refractive index determination and crystal frequency drift is usually less than 5 ppm. The instrument requires a 12 Volt D. C. power supply and the current consumption of the distance meter is 0.38 Amps

Weight of instrument is 1.7 kg
Weight of battery tray with batteries is 2 kg

MEDIUM-RANGE DISTANCE METER AGA, Sweden
Model : Geodimeter NASM-2A

Measuring unit (Length 880mm, Width 430mm, Height 350mm)
Optical unit (Length 870mm, Width 460mm, Height 530mm)

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This Geodimeter NASM-2A is an electronic-optical instrument for first-order geodetic distance measuring purposes, and is capable of measuring distances up to 50 kilometres. The instrument consists physically of two units, the 'measuring unit', housing the electronic equipment, and the 'optical unit', containing the light conductor and the two large spherical mirrors. With the two units combined, the instrument weighs approximately 100 kilograms.
The first image above shows the front control panel view of the assembled instrument consisting of the two units. The second image shows the side view of the instrument, and here the two units can be clearly differentiated with the measuring unit on the left side of the image and the optical unit on the right. The third image represents a rear view of the Geodimeter (opposite side of control panel) where the two large "transmitting" and "receiving" spherical mirrors are clearly visible.
The mirror lenses with their focusing devices are mounted on a beam attached to the front of the optical unit by means of ball links. This makes the position of the complete optical system fixed with regard to the measuring unit and hence adjustments are reduced to a minimum. In order to protect the aluminised glass surfaces of the mirrors they are covered with a very thin layer of silicium-monoxide.
The "electronic system" is mounted inside the measuring unit and contains the crystal oscillator with power amplifier for the light modulator, the photo multiplier with associated circuits for detecting and indicating the zero points and the power supply converting mains voltage to operating voltages for the electronic tubes. The purpose of the "optical system", which is housed inside the optical unit, is to project the modulated light on the reflector and to concentrate the reflected light on the phototube. The built-in light conductor offers a possibility of an internal calibration of the instrument which considerably increases its precision.
The primary power required to run the Geodimeter is about 140 Watts, which is supplied by a 220 Volt petrol generator. The instrumental accuracy is primarily limited by the accuracy of the modulation frequency, as this directly determines the unit length. Experience has shown that after a few months running-in-time, the frequency error will be smaller than one part per million (1 ppm).

There are two types of reflectors used with the Geodimeter, and these include the 'Plane Mirror Reflector' and the 'Spherical Mirror Reflector' (both are shown in the images on the left).
When using the Geodimeter, the observations can only be made in low light conditions (eg. at night)
Weight of Measuring Unit is 46 kg
Weight of Optical Unit is 48 k