Epson YM82A Guide

Watch Movement Specification and Drawing

CHRONOGRAPH

Cal. YM82A

Movement Size

Casing Diameter

Height

Battery Life

12’’’

Ø27.0mm

3.7mm

3 years

Date: 30/Jan./'15

Cal. YM82A

Items Rev. Page

Specifications 01 1

Appearance 01 2

Casing 01 3

Hand fitting 01 4

Hand setting stem 01 5

Magnetic shield plate 01 6

Dial-01 01 7-01

Dial-02 01 7-02

Holding ring for dial-01 02 8-01

Holding ring for dial-02 02 8-02

Attention for assembly 01 9

Attention of casing part structure 01 10

Attention of dial design 01 11

Operation-01 01 12-01

Operation-02 01 12-02

Date :

1. MOVEMENT DIMENSIONS

Outside diameter

27.60mm (12H-6H)

24.00mm (3H-9H)

Casing diameter

27.00mm (12H-6H)

Total height

3.7mm (including battery)

2. TIME STANDARD

Type of quartz oscillator

Tuning fork

Frequency of quartz oscillator

32,768 Hz

Accuracy

20 seconds per month (on wrist)

Operating temperature range

−

℃

＋

℃

Regulation device

Nil (Pre-adjusted)

3. INDICATOR / FUNCTIONS

3 Hands

Hour / Minute / Second chronograph (Center)

Small hands

1/100 second chronograph / 1/10 second chronograph (12H)

40 minute chronograph (6H) / Small second (9H)

Calendar

Instant setting device for date calendar

Reset switch

System-reset switch

Power depletion warning function (BLD)

(Small second hand moves at 2-second intervals)

Chronograph

4. FEATURES

Jewels

0 Jewels

Anti-magnetism

Over 1600A/m (Direct current magnetic field)

Maximum unbalance of hands

Small second hand

: 0.03

・

1/100 second chronograph hand

: 0.005

・

1/10 second chronograph hand

: 0.025

・

40 minute chronograph hand

: 0.03

・

Second chronograph hand

: 0.06

・

Minute hand

: 0.70

・

Moment of Inertia

Second chronograph hand

: less than 0.2

μ

・

m²

5. BATTERY

Type / Size

Silver oxide battery /

9.5mm

t 2.73mm

Recommended battery

SR927W

Nominal voltage

1.55 V

Battery life

Approx. 3 years

(120 minutes chronograph operation per day)

Driving current consumption

Approx. 0.80

Operation stopping voltage

0.9 V

6. SEPARATED PARTS (Parts code)

Hand setting stem

0351584 (Standard) or 0351585 (Long)

Holding ring for dial

0866650 (Standard) or 0866789 (Special)

Battery

SR927W

Magnetic shield plate

4259519

A.C. comment seal

0110705

7. TEST OF ACCURACY

Equipment to be used

SEIKO quartz tester QT-99, QT2100

Greiner quartz timer-C , Witschi Q-tester 4000

Duration of measurement

10 seconds

Microphone to be used

Electromagnetic detection type

All specifications are subject to change without notice.

Cal.

Rev. : 01

30/Jan./'15

YM82A Specifications

Analog Quartz 12''' Center second Chronograph Movement

The chronograph can measure up to 41 minutes in 1/100 second

increments, capable of timing 120 minutes.

P. 1

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