User manual CITIZEN WATCH B877

[. . . ] Once fully charged, the watch will continue to run for about 6 months without further charging. To use this watch comfortably, make sure that the watch is always recharged before it stops. (Overcharge Prevention Function is included) We recommend that you recharge the watch everyday. B. SETTING THE TIME AND DATE Local time hours hand Minute hand Date Date and Hour hand correction position Crown Time (24hour, minute, second) correction position Normal position Second hand Solar cell 24 hour hand *If the crown is of the screw- type, set the time and calendar after first loosening the screw. [. . . ] When you charge the watch with an incandescent lamp, halogen lamp or other light source that generates heat, take a distance about 50cm (20in. ) from the light source to prevent extremely high temperature. 12 13 G. TIME REQUIRED FOR CHARGING Time required for recharging may vary according to the design (color of the dial, etc. ) and operating environment. Illuminance (lux) 500 1000 3000 10000 100000 Time required Environment inside an ordinary office 60-70cm (24-28in. ) under a fluorescent light (30W) 20cm (8in. ) under a fluorescent light (30W) From the stop state to the one second movement * The recharging time is the time when the watch is continuously exposed to radiation. The time required for the watch to run for one day with one second interval movement 22 hours 11 hours 3 hours 30 minutes 1 hour 14 minutes One day usage 1 hour 30 minutes 45 minutes 15 minutes 5 minutes 2 minutes Empty to full 320 hours 158 hours 53 hours 17 hours 6 hours Exterior, cloudy Exterior, summer, sunny 14 15 H. USING THE SLIDE RULE Flying distance and other navigation calculations as well as general calculations can be performed using the slide rule located around the outside of the dial. This slide rule is not able to display decimal places for calculation results, and should only be used as a general reference as an alternative to more accurate calculations. Turning the crown at the 8:00 position allows the slide rule around the dial (Outside Scale) to be rotated. Crown for turning the outer scale Inside scale Outside scale A. Calculation of time required Question: How long does it take an airplane flying at 180 knots to fly a distance of 450 nautical miles?Solution: Set the 18 mark on the outside scale to the SPEED INDEX (Y). At this time, the point on the inside scale that is aligned with 45 on the outside scale indicates (2:30), and the answer is 2 hours and 30 minutes. 16 17 2. Speed (Ground Speed) Calculation Question: What is the speed (ground speed) of an airplane when it takes 1 hour and 20 minutes to fly a distance of 240 nautical miles?Solution: Align the 24 on the outside scale with 1:20 (80) on the inside scale. At this time, 18 is aligned with the SPEED INDEX (Y) on the inside scale, and the answer is 180 Kt. 3. Flying distance calculation Question: What is the flying distance traveled in 40 minutes at a speed of 210 knots?Solution: Align the 21 on the outside scale with the SPEED INDEX (Y) of the inside scale. The 40 of the inside scale is now pointing to 14, and the answer is 140 nautical miles. 18 19 4. Fuel consumption rate calculation Question: If 120 gallons of fuel are consumed in 30 minutes' flying time, what is the fuel consumption rate?Solution: Align the 12 of the outside scale with 30 of the inside scale. The SPEED INDEX (Y) now points to 24, and the answer is 240 gallons per hour. 5. Fuel consumption calculation Question: How much fuel is consumedin 6 hours at a fuel consumption rate of 250 gallons per hour?Solution: Align the 25 of the outside scale with the inside scale's SPEED INDEX (Y) of the inside scale. The 6:00 is aligned with 15, and the answer is 1500 gallons. 20 21 6. [. . . ] Timekeeping may become inaccurate if the watch is exposed to strong static electricity, such as is emitted from a TV screen. · Do NOT subject the watch to a strong shock such as dropping it onto a hard floor. · Avoid using the watch in an environment where it may be exposed to chemicals or corrosive gases. If solvents, such as thinner and benzine, or substances containing such solvents come in contact with the watch, discoloration, melting, cracking, etc. If the watch comes in contact with mercury used in thermometers, the case, band or other parts may become discolored. 32 33 J. [. . . ]