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PM-5 / PM-5/1520

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Suunto PM-5, PM-5/1520 USER'S GUIDE
TABLE OF CONTENTS PM-5/1520.... 4 OPTICAL HEIGHT METER... 4 INSTRUCTIONS FOR USE... 4 MEASUREMENT OF HEIGHT... 5 INSTRUCTIONS FOR USE OF NOMOGRAM.. 6 ESTABLISHING THE BASIC DISTANCE... 6 PM-5.... 8 OPTICAL READING CLINOMETER... 8 AVAILABLE PM-5 VERSIONS... 9 INSTRUCTIONS FOR USE.... 10 NOMOGRAPHICAL HEIGHT CORRECTION.. 15 INSTRUMENT BODY COVER FOR SUUNTO KB-14 AND PM-5. 16

PM-5/1520

OPTICAL HEIGHT METER Suunto Height Meter PM-5/1520 is an instrument for measuring heights, especially heights of trees, with great accuracy and speed. The body of the instrument is corrosion-resistant anodized aluminium-alloy. The scale card runs on a special bearing in a hermetically sealed plastic container filled with a liquid which guarantees that it runs freely and stops quickly. The liquid will not freeze, retains full damping properties in working conditions and eliminates irritating scale vibrations. INSTRUCTIONS FOR USE When measured from distances of 15 m and 20 m, tree heights can be read straight off the instruments scales. The readings should be doubled when measuring from distances of 30 m and 40 m. The Suunto Height Meter can also be used to determine the angle of a gradient. This is done by taking a sighting along the line of a gradient using the 20 m scale on the left of the instrument. The reading obtained can be checked in the conversion table on the back of the instrument to obtain the angle.
MEASUREMENT OF HEIGHT The actual measurement of the height of the tree should be done from the distance measured in the following way: the observer sights the top of the tree with both eyes open. The object sighted, the hair line and the scale will all be simultaneously visible in the instrument`s field of vision. As soon as the hairline coincides with the top of the tree, the tree height can be read off (in this example, from the 20 m scale on the left of the instrument). The reading obtained is the height of the tree measured from the eye level of the observer. The base of the tree remains to be sighted. If this is situated below the eye level of the observer, then the actual height of the tree is obtained by adding the two readings together. If it is above the observer`s eye level, the tree height is obtained by taking the difference between the two readings. In fact, in the latter case the distance cannot be measured horizontally. Thus, to get
exactly correct result you have to proceed as stated below. On level ground, the tree top readings is usually sufficient: one only has to add the height of the observer`s eye level (1.60 m in this case), which is already known. INSTRUCTIONS FOR USE OF NOMOGRAM If the distance, because of very uneven ground, cannot de determined horizontally as stated above, the nomogram on page 7 should be used.

ESTABLISHING THE BASIC DISTANCE Because this instrument does not incorporate a prism, the basic distance e.g. 15 m has to be determined using a tape measure along the ground. Take the top and base readings and add or subtract them to get the apparent height. On the nomogram on page 7, locate the apparent height on the right hand scale. On the double scale on the left, locate the reading obtained from sighting the base of the tree. Note that readings for falling and rising gradients should be taken from different sides of the scale. Connect these two points of the nomogram with a straight line. The centre scale of the nomogram now indicates the true height of the tree.
Important notice The axes of the eyes of some people are not parallel, a condition called heterophoria. This can even vary in time and be dependent on different factors too. Therefore, in order to be sure that said phenomenon does not affect the accuracy of readings, it is suggested that the user checks this possibility before taking the actual readings as follows: Take a reading with both eyes open and then close the free eye. If the reading does not change appreciably there is no disalignment of the eye axes, and both eyes can be kept open. Should there be a difference in the readings, keep the other eye closed and sight halfway to the side of the instrument body. This will create an optical illusion whereby the hairline continues past the instrument body and is seen against the target.

Downhill

m 14 13

Uphill

Corrected height

Base reading

Apparent height
OPTICAL READING CLINOMETER The sturdy pocket-size construction renders the + and SUUNTO CLINOMETER most suitable for every type of ft. scales work. Easy for rapid reading through a parallax-free lens is incorporated into the design. Sighting and scale reading are done simultaneously. + and There are no screws to turn, no bubbles to center, and degree scales nothing to adjust. Where space is limited, as in geological and mineralogical work, the inclination of strata and other formations can be read placing the instrument along the Cross-hair extended by contour or surface of the formation and reading the optical illusion angle directly through the side window. Construction features Additional The framework is of corrosion resistant light-weight degree scale in side window aluminum. The scale card is supported by a jewel bearing assembly and all moving parts are immersed in a damping liquid inside a high strength hermetically sealed plastic container. The liquid dampens all undue scale vibrations and permits a smooth shockless movement of the scale card. The material of the container is not attacked by sunlight or water. The liquid does not freeze in the arctic or evaporate in the tropics.

Specifications Weight: 120 g / 4.2 oz. Dimensions: 74 x 52 x 15 mm / 2 3/4" x 2" x 5/8". The optical scales are graduated in degrees from 0 to 90, and 0 % to 150 %. A table of cosines is imprinted on the back of the instrument. Resolution Can be read directly to one degree or one per cent. Can be estimated to 10 minutes or 1/5 of 1 per cent, the latter naturally applying to readings around the zero level. AVAILABLE PM-5 VERSIONS The basic PM-5/360 PC has been modified by fitting it with different scale combinations for special uses. Thus there is available a version with a new degree or grade scale. Here, instead of the normal 360-degree division, the full circle is divided into 400 grades (g). The per cent scale there alongside is normal. The model is PM-5/400 PC.
INSTRUCTIONS FOR USE Readings are usually taken with the right eye. Owing to differences in the keenness of the sight of the eyes and because of personal preferences the use of the left eye is sometimes easier. It is of prime importance that both eyes are kept open. The supporting hand must not obstruct the vision of the other eye. The instrument is held before the reading eye so that the scale can be read through the optics, and the round side-window faces to the left. The instrument is aimed at the object by raising or lowering it until the hairline is sighted against the point to be measured. At the same time the position of the hair line against the scale gives the reading. Owing to an optical illusion the hair line (crosshair) seems to continue outside the frame and is thus easily observed against the terrain or the object. The left-hand scale gives the slope angle in degrees from the horizontal plane at eye level. The right-hand scale gives the height of the point of sight from the same horizontal eye level, and it is expressed in per cent of the horizontal distance. The following example illustrates the procedure:
The task is to measure the height of a tree at a distance of 25 m / 82 ft. on level ground. The instrument is tilted so that the hair line is seen against the tree-top (apex). The reading obtained will be 48 per cent (ca 25.5). As the distance is 25 m / 82 ft. the height of the tree is 48 / 100 x 25 m = ca. 12 m or equally 48 / 100 x 25 m = ca. 12 m or equally 48 / 100 x 82 ft. = ca. 39 ft. To this must be added the eyes height from the ground, e.g. 1.6 m or 5 ft. Their sum is 13.6 m or 44 ft, the height of the tree. In very exact measurements, and particularly on sloping ground two readings are taken, one to the top, the other to the base of the trunk. When the trunk base is below eye level the percentages obtained are added. The total height is the sum percentage of the horizontal distance. For example, it the apex reading is 41 % and the ground reading 13 %, the total height of the tree measured from a distance of 25 m / 82 ft. is (41 + 13) / 100 x 25 m = 54 / 100 x 25 m = ca. 13.5 m or equally in feet (41 + 13) / 100 x 82 ft = 54 / 100 x 82 ft = ca. 44 ft.

When the trunk base is above eye level, the base reading is subtracted from the apex reading, and the total height is the difference percentage of the horizontal distance. For example, if the apex reading is 65 % and the base reading 14 %, the total height is (64 14) / 100 x 25 m = 50 / 100 x 25 m = 12.5 m or equally in feet (64 14) / 100 x 82 ft = 50 / 100 x 82 ft = 41 ft. When calculations are made mentally it is advisable to use measuring distance of 50, 100 or 200 m / ft. for the sake of simplicity. All readings of the percentage scale are based on the horizontal distance. This means that if the distance on sloping terrain is measured along the ground an error is introduced, and this must be corrected for accurate results. The error is insignificant for most purposes at small ground slope angles but increases progressively as the angle increases.
The trigonometrical correlation is H = h x cos Where H is the true or corrected height, h is the observed height and (alpha) is the ground slope angle. With the aid of the above equation the correction can also be made in the distance. In this case h means the distance measured along the ground and H is the horizontal distance sought. If the corrected distance is used no correction in the height observed is needed. When calculating the horizontal distance by using the ground distance and the slope, it must be pointed out that an error is introduced if the slope is measured from eye level to the trunk base. Measuring the slope along the ground would be cumbersome and inconvenient. No error is introduced, however, when the slope angle is measured from eye level to sighting mark made or placed on the trunk at eye level whereby the two lines of measurement become parallel. The true angle of slope is 9 degrees. The example shown in the following figure illustrates both methods of calculation. Method 1. Measure the ground distance. This is found to be 25 m / 82 ft. Then measure the slope angle. This is 9 degrees. Read percentages of top and ground points. These are 29 and 23 per cent.

Calculate:

23- 29- 52-------- + -------- = -------100
Take 52 per cent of 25 m / 82 ft. This is 13 m / 42.6 ft. Multiply this by the cosine of 9 degrees. 0.987 x 13 m = 12.8 m or equally in feet 0.987 x 42.6 ft. = 42 ft. Method 2. Multiply the ground distance by the slope angle cosine. 0.987 x 25 m = 24.6 m or equally in feet 0.987 x 82 ft. = 80.9 ft. Add percentage readings as above and take the sum percentage of the corrected distance.

52-------- 24 ,6m = 12 ,8m 100

or equally in feet

52-------- 80 ,9ft = 42ft 100
This example shows that a slope angle of 9 degrees causes a correction of only 2.3 per cent but when the slope angle is 35 degrees the correction means a reduction of about 18 per cent in the observed height.
NOMOGRAPHICAL HEIGHT CORRECTION When the nomogram is used, all correction calculation becomes unnecessary. Only a ruler or some other convenient object with a straight edge is needed to obtain the nomographical solution. The nomogram is used by placing the ruler so that its edge intersects the angle scale on the left at the slope angle point and the observed height scale (on the right) at the pertinent point. The corrected height (or distance) is read at the point where the edge intersects the corrected height scale in the middle. When using a measuring distance of 100 m / ft. along the ground the correction procedure becomes very simple. No slope angle measurement is then necessary. One needs only the reading of the top point and that of the ground point. Depending on the situation their sum or difference gives the apparent height directly in feet. This is then corrected as follows: First, find on the right-hand scale in the nomogram the point indicating the apparent height. Secondly find on the left-hand double scale the point indicating the ground point reading. Thirdly, connect these points. The corrected reading will be found from the pertinent middle scale at the point of intersection. In this procedure the slope angle can be neglected as the left-hand ground point scale has been constructed so that slope angle and the average eye level height of 1.6 m / 5.5 ft. have been taken into account.
INSTRUMENT BODY COVER FOR SUUNTO KB-14 AND PM-5 The instrument body cover is suited to the following KB and PM models: KB-14 (all models) and PM-5.
Suunto PM-5, PM-5/1520 GUIDE DE L'UTILISATEUR FR
TABLE DES MATIRES PM-5/1520.... 4 ALTIMTRE OPTIQUE... 4 MODE DEMPLOI.... 4 MESURE DES HAUTEURS... 5 MODE DEMPLOI DU NOMOGRAMME.. 6 DTERMINATION DE LA DISTANCE DE BASE... 6 PM-5.... 8 CLINOMTRE LECTURE OPTIQUE... 8 VERSIONS DE PM-5 DISPONIBLES... 9 MODE DEMPLOI... 10 CORRECTION DE LA HAUTEUR NOMOGRAPHIQUE.. 15 PROTECTION DU CORPS DES KB-14 ET PM-5 DE SUUNTO. 16
ALTIMTRE OPTIQUE Laltimtre PM-5/1520 de Suunto est un instrument destin mesurer des hauteurs et plus particulirement des hauteurs darbres, avec prcision et rapidit. Le corps de linstrument est en aluminium anodis rsistant la corrosion. Le disque gradu repose sur un palier spcial dans une capsule en plastique tanche et toutes les parties mobiles sont immerges dans un liquide, ce qui permet au cadran de se dplacer librement et de s'arrter rapidement. Le liquide ne gle pas, conserve lensemble de ses proprits damortissement dans des conditions de travail et limine les vibrations irritantes de la calamine. MODE DEMPLOI En cas de mesure dune hauteur une distance de 15 ou 20 mtres, trois hauteurs peuvent tre lues directement sur lchelle de laltimtre. En cas de mesure dune hauteur une distance de 30 ou 40 mtres, le chiffre obtenu doit tre doubl. Laltimtre de Suunto peut galement tre utilis pour dterminer langle dune pente. Pour ce faire, il convient de visualiser la ligne de la pente laide de lchelle de 20 mtres gauche de linstrument. Le relev obtenu permettant dobtenir langle peut tre compar aux chiffres indiqus dans le tableau de conversion situ larrire de linstrument.

SUUNTO PM-5

Height meter, clinometers and combined height and clinometers Suunto PM-5 provides you with a large selection of height meters, clinometers and combined height- and clinometers.

Product Features

Suunto height meters are instruments for measuring the heights, especially the height of trees, with great accuracy and speed. The height meters can also be used to determine the angle of a gradient. Suunto hand-held clinometers are precision instruments used all over the world by surveyors, engineers, cartographers, geologists, miners and architects and many others to measure heights, vertical angles and slopes quickly and easily.
Suunto PM-5 Story Combined height and clinometers
PM-5/1520 PC: Scales: %, 15 m and 20 m, conversion table 20 m - degrees, optical adjustment for reading
PM-5/1520 D: Scales: %, 15 m and 20 m, cosines 0 - 45, optical adjustment for reading
Both height meters and clinometers have sturdy housing bodies made from corrosion resistant anodized aluminum alloy. The scale cards run on special bearings in hermetically sealed plastic containers filled with a liquid which guarantees that they run smoothly and stop quickly. The liquid will not freeze or evaporate, retains full damping properties in all working conditions and eliminates irritating scale vibrations. There is a large selection of scales to choose from. These include normal linear angle scales, i.e. degrees, gons and mils as well as per cent scales, topographic scales, metric or American and special secant scales.