Suunto 1520 User manual
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PM-5 / PM-5/1520
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Suunto PM-5, PM-5/1520
USER'S GUIDE
EN
3
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
4
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 instrument’s 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.
5
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
6
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.
7
Important notice
The axes of the eyes of some people are
not parallel, a condition called heteropho-
ria. This can even vary in time and be
dependent on different factors too. There-
fore, in order to be sure that said phenom-
enon 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.
Uphill
Base reading
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
2
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
m
Apparent height
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
m
Corrected height
L-20
m
Downhill
8
PM-5
OPTICAL READING CLINOMETER
The sturdy pocket-size construction renders the
SUUNTO CLINOMETER most suitable for every type of
work. Easy for rapid reading through a parallax-free
lens is incorporated into the design.
Sighting and scale reading are done simultaneously.
There are no screws to turn, no bubbles to center, and
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
contour or surface of the formation and reading the
angle directly through the side window.
Construction features
The framework is of corrosion resistant light-weight
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.
+ and –
ft. scales
Additional
degree scale
in side window
Cross-hair
extended by
optical illusion
+ and –
degree scales
9
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.
This manual suits for next models
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