Specifications

Click to Enlarge - Schematic Diagram ( 2200 x 2200 px )

Click to Enlarge – Schematic Diagram ( 2200 x 2200 px )

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 :)

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

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 ( Silwer oxide )

Parts No. : 280-30 (1 unit ), Ag20/ KOH

Cell code : SR1120W

Voltage : 1,55V

Capacity : 55mAh ( High capacity product )

Size (mm) : 11.6 ( diameter ) x 2,1 ( high )

Lifetime : About 2 years

* ( 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 )

 

 

 

 

 

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