Seiko 7T85 Specifications download pdf (Page 10)

English

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To measure the hourly rate of operation

Use the stopwatch to measure

the time required to complete 1

job.

Tachymeter scale indicated by

STOPWATCH 1/5-secondhand

gives the average number of

jobs accomplished per hour.

Ex. 1

STOP-

WATCH

1/5-second

hand:

20 seconds

Tachymeter

s c a l e : “1 8 0 ”

“180” (tachymeter scale ﬁgure) x 1 job

= 180 jobs/hour

Ex. 2: If 15 jobs are completed in 20 seconds:

“180” (tachymeter scale ﬁgure) x 15 jobs = 2700 jobs/hour

TELEMETER

(for models with telemeter scale)

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.

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Seiko 7T85 Specifications Page 10