Seiko Telemeter Handleiding

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English

English

TELEMETER

(for models with telemeter scale on the dial)

● The telemeter can provide a rough indication of the distance to the source of light

and sound.

● The telemeter indicates the distance from your location to an object that emits both

light and sound. For example, it can indicate the distance to the place where

lightning struck by measuring the time elapsed after you see a flash of lightning

until you hear the sound.

● A flash of lightning reaches you almost immediately while the sound travels to you

at a speed of 0.33 km/second. The distance to the source of the light and sound can

be calculated on the basis of this difference.

● The telemeter scale is so graduated that the sound travels at a speed of 1 km in 3

seconds.*

*Under the condition of temperature of 20

°

C(68

°

F).

CAUTION

The telemeter provides only a rough indication of the distance to the place where

lightning struck, and therefore, the indication cannot be used as the guideline to

avoid the danger of lightning. It should also be noted that the speed of the sound

differs depending on the temperature of the atmosphere where it travels.

HOW TO USE THE TELEMETER

Before beginning, check that the stopwatch has been reset.

START

(Flash of light)

STOP

(Crash of thunder)

Press button A to start the

stopwatch as soon as you

see the light.

When you hear the sound,

press button A to stop the

stopwatch.

Read the telemeter scale

that the stopwatch second

hand points to.

Approx. 3 km

Please note that the stopwatch second hand moves in 1/5 second increments and does not

always point exactly to the graduations of the telemeter scale. The telemeter scale can be used

only when the measured time is less than 60 seconds.

A

3

2

1

Product specificaties