Epson YM92A Guide

Watch Movement Specification and Drawing
CHRONOGRAPH
Cal. YM92A
Movement Size
Casing Diameter
Height
Battery Life
12’’’
Ø 27.0mm
3.7mm
3 years

Date: 11/Jan./'19
Cal. YM92A
Items Rev. Page
Specifications 05 1
Appearance 01 2
Casing 05 3
Hand fitting 03 4
Hand setting stem 02 5
Dial-01 02 6-01
Dial-02 01 6-02
Dial-03 01 6-03
Dial-04 01 6-04
Holding ring for dial-01 03 7-01
Holding ring for dial-02 02 7-02
Attention for assembly 03 8
Attention of casing part structure 02 9
Operation-01 03 10-01
Operation-02 02 10-02

Date :
1. MOVEMENT DIMENSIONS
Outside diameter φ27.60mm(12H-6H) ×24.00mm(3H-9H)
Casing diameter φ27.00mm(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 −5℃to ＋50℃
Regulation device Nil (Pre-adjusted)
3. INDICATOR / FUNCTIONS
3 Hands Hour / Minute / Second chronograph (Center)
Small hands Hour and minute chronograph (6H) / Small second (9H)
1/20 second chronograph (12H)
Calendar Instant setting device for date calendar
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 : 0.03μN・m
1/20 second chronograph hand : 0.03μN・m
Minute chronograph hand : 0.03μN・m
Second chronograph hand : 0.06μN・m
Minute hand : 0.70μN・m
Moment of Inertia Second chronograph hand : less than 0.2μg・m²
5. BATTERY
Type / Size Silver oxide battery /φ9.5mm ×t 2.73mm
Recommended battery SR927SW
Nominal voltage 1.55 V
Battery life Approx. 3 years
(2 hours chronograph operation per day)
Driving current consumption Approx. 0.80μA
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 SR927SW
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.
Analog Quartz 12''' Center second Chronograph Movement
Cal.
Rev. : 05
30/Jan./'15
YM92A Specifications
The chronograph can measure up to 12 hours in 1/20 second
increments.
P. 1