Date :
1. MOVEMENT DIMENSIONS
Outside diameter
φ
27.60mm (12H-6H)
×
24.00mm (3H-9H)
Casing diameter
φ
27.00mm (12H-6H)
Total height
4.93mm (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 / 1/5 second chronograph (Center)
Small hands
Small second (9H) / Minute chronograph (6H) / 24 Hour (3H)
Calendar
Big size date calendar (12H)
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
: 0.03
μ
N
･
m
24 Hour hand
: 0.03
μ
N
･
m
Minute chronograph hand
: 0.03
μ
N
･
m
1/5 second chronograph hand
: 0.09
μ
N
･
m
Minute hand
: 0.7
μ
N
･
m
Moment of Inertia
1/5 second chronograph hand
: less than 0.2
μ
g
・
m²
5. BATTERY
Type / Size
Silver oxide battery /
φ
9.5mm
×
t 2.73mm
Recommended battery
SR927SW
Nominal voltage
1.55 V
Battery life
Approx. 5 years
(2 hours chronograph operation per day)
Driving current consumption
Approx. 0.80
μ
A
Operation stopping voltage
0.9 V
6. SEPARATED PARTS (Parts code)
Hand setting stem
0351584 (Standard) or 0351585 (Long)
Holding ring for dial
0866854 (Standard)
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''' Big date Center second Chronograph Movement
Cal.
Rev. : 02
30/Jan./'15
YM04A
Specifications
The chronograph can measure up to 60 minutes in 1/5 second
increments, capable of timing 12 hours.
P. 1
