Believe it or not this watch consists of more than one hundred elements. The Schematic Diagram above ( 2200 x 2200 px ) shows the General Construction of the watch .
The following Specification ( List of All Watch Functions ) has been prepared by me on the data sheet provided by Citizen – including the service manual. However, I have supplemented it with a few items not mentioned by the manufacturer but deserving of attention. I made two bug fixes – that do not know why Citizen posted. That is, the temperature measurement resolution is 0.1 * C not 1 * C (which means 1 * F accuracy) as reported by Citizen. And the accuracy of the stopwatch is 0.001 sec. not 0.01 sec. – as the producer said.
Although in the introduction Citizen gave correct values – it is no longer in the specification. Why? We can only guess. It is probably an oversight because never before has any manufacturer ( including Citizen ) manufactured a watch with such a precise thermometer and such a precise stopwatch. In 1981, stopwatches with an accuracy of 1/100 sec. were standard. Which admits Citizen himself. And so it remained until today 🙂
Interesting facts: such as how many transistors did the microprocessor in this watch contain and many more can now be found at : History of Ana Digi Temp 2
SPECIFICATIONS
Type : Combination of Quartz Watch
Accuracy : +/- 15 sec per month ( +/- 0,5 sec. per day ) at normal temperature
Oscillation : 32,768 Hz
Display method : FE-type nematic LC ( liquid crystal ) & 3-split multiplex drive
Converter : Bipolar step motor
Integrated circuit C.MOS – LSI ( 1 unit )
Effective temp range : – 10*C ~ + 60*C ( 14*F – 140*F )
Adjustment of time rate : BY TRIMMER CONDENSER
DISPLAY FUNCTIONS
Normal Time : AM/PM, hour, minute & seconds
Calendar ( Measurement of temp. ) : Day, date & temp. ( See thermometer )
Alarm ( Temp. memory ) : AM/PM, hour, minutes & storage of temp.
Dual time : AM/PM, hour, minute, seconds & L ( local time mark )
Stopwatch : Hour ( 2nd analog ) : minute, seconds & 1/1000 sec.
( Unit time of measurement: 1/1000 sec. with 12-hour display )
ADDITIONAL FUNCTIONS
Fully automatic calendar ( 1980 – 2019 ) – see How to Extend
Power cell life indicator – See For More Detail
Electromagnetic correction system
Illumination lamp
Alarm ( witch alarm monitor )
Chime function ( WITCH CHIME SET MARK )
12/24 hour switching function
1/1000 sec. stopwatch
Lap Time function ( with sound confirmation )
Temp Memory function
Centigrade / Fahrenheit switching function ( with Cal. No. 8980 and 8984 only )
Instant manual return
Auto return
Water-resistance of Case up to 100 m / 328 feet ( 10 atmospheres of pressure )
Power Cell ( SILVER OXIDE )
Parts No. : 280-30 (1 unit ), Ag20/ KOH
Cell code : SR1120W ( Round Silver Cell with a diameter of 11.6 mm and a height of 2.1 mm ).
Voltage : 1,55V
Capacity : 55mAh ( High capacity product )
Size (mm) : 11.6 ( diameter ) x 2,1 ( high )
Lifetime : About 2 years ( SEE MORE )
* ( 20 sec. alarm, 24 hourly chimes & 3 sec. illumination of lamp per day in second mode of 2nd analog watch )
Sensor Part :
Use of thermistor
Measurement range of temp. :
-9.9*C ~ +59.9*C ( 14*F ~ 139*F )
Accuracy :
+/- 1*C (+/- 2*F ) at +20*C ~ +30*C ( 36*F ~ 86*F )
+/- 2*C (+/- 4*F ) at -5*C ~ +40*C ( 23*F ~ 104*F )
Resolution :
0.1*C (1*F)
Remarks :
Product code No. : A – Reflecting plate is ( silver color )
Product code No. : B – Reflecting plate is ( gold color )
