Citizen H461 User Manual

2
WThis watch is a radio wave watch that W
receives the standard time radio wave
transmitted in Germany.
This radio wave watch is equipped with a regular automatic reception
function that sets the time and date by automatically receiving radio
waves twice a day at 3:00 AM and 4:00 AM, and a free reception
function that allows the time to be set arbitrarily by receiving radio
waves. A time difference can also be set in 1 hour units based on
German standard time.
3
English
The design may differ according to the model.
Hour hand
Button (B)
Minute hand
H,M,L:
Reception level/
Reception result
Second hand
No: Reception result
SET:
Indicated when a
time difference has
been set
±0:
Indicated when
no time
difference has
been set
Button (A)
Crown
Shorter end of
second hand
RX:Reception standby
(start of radio wave reception)
Crown for turning
the outer scale
L This watch indicates the reception level and reception result with the shorter end of the second hand.

Citizen H461 Specifications

Operating Environment

timekeeping accuracy	±15 seconds per month
operating temperature range	-10°C to +60°C

Power and Battery

continuous operation time with power save	Approx. 2 years
continuous operation time without power save	Approx. 6 months
insufficient charge warning display time	Approx. 6 days

Summary

Watch Introduction and Core Features

Radio Wave Reception Capability

Describes the watch's ability to receive standard time radio waves.

Time Difference Setting

Allows setting time differences in 1-hour units based on German standard time.

Essential Charging and Usage Instructions

Low Charge Indicator

The second hand moving at two-second intervals indicates insufficient charge.

Recharging Procedure

Place the watch under direct sunlight for about 8 hours to recharge.

Pre-Use Checks and Reception Confirmation

Second Hand Movement Check

Confirms normal operation by checking the second hand's 1-second movement.

Verifying Reception Status

Press Button (A) to check reception result (H, M, L, or NO).

Radio Wave Reception Best Practices

Regular Automatic Reception

Automatic reception occurs daily at 3:00 AM and 4:00 AM.

Free Reception Function

Allows manual reception of radio waves at any desired time.

Reception Procedures and Long-Term Storage

Reception Process States

Illustrates second hand positions for standby, in progress, and completed reception.

Storing in Darkness

Watch enters Power Save mode; cancel by exposing to light and performing Free Reception.

Overview of Watch Capabilities

Automatic Time Correction

Automatically corrects time and date using German standard time radio waves.

Eco-Drive and Power Save Features

Powered by light (Eco-Drive); has a power save function to reduce consumption.

Optimizing Radio Wave Reception

Antenna Orientation and Placement

Face the 9:00 position towards the transmitter, place near a window for best results.

Difficult Reception Locations

Lists environments prone to poor reception, like inside buildings or near electronics.

Radio Wave Reception Modes

Regular Automatic Reception Details

Watch automatically receives waves twice daily at 3:00 AM and 4:00 AM.

Free Reception Step-by-Step

Detailed steps to initiate and perform manual radio wave reception.

Advanced Reception and Status Indicators

Recovery Automatic Reception

Automatic reception occurs after charging from a stopped state due to low power.

Reception Process Visualization

Shows second hand movement for standby, in-progress, and completed reception.

Confirming Reception Success

Checking Reception Result

Press Button (A) to view result (H, M, L, or NO) for 10 seconds.

Interpreting Reception Outcomes

Successful reception corrects time/date; failed reception reverts to previous time.

Understanding Reception Levels and Areas

Reception Level Indicators (H, M, L)

Second hand positions indicate high (H), moderate (M), or low (L) reception levels.

Receiving Area Information

Details on transmitter station and general areas where reception is possible.

Manual Time and Date Setting Basics

Screw-Lock Crown Operation

Instructions for loosening, operating, and tightening the screw-lock crown.

Securing Crown After Adjustments

Ensure the crown is tightened after setting to prevent errors.

Correcting Watch Hands

Setting Second and Minute Hands

Procedure to set second and minute hands to the 00 seconds position.

Adjusting the Minute Hand

How to advance or move back the minute hand using the crown.

Correcting Month and Year

Reading Month Indicators

Explains how the second hand indicates the month by its position.

Reading Year Indicators (Leap Year)

Details how dial graduations indicate leap years and subsequent years.

Month and Year Correction Procedures

Month and Year Zones Explained

Clarifies hour zones corresponding to specific months and years.

Performing Month/Year Correction

Steps to set the month and year using the crown.

Correcting Hour Hand and Date

Hour Hand and Date Interrelation

Date changes with hour hand movement; they cannot be set independently.

Hour Hand Adjustment Process

Procedure to move the hour hand, which also adjusts the date.

Hour Hand and Date Adjustment Details

Advancing Hour Hand and Date

Moving the hour hand clockwise adjusts the date by one day per two revolutions.

Time Setting Accuracy (AM/PM)

Emphasizes paying attention to AM/PM when setting time for accuracy.

Time Difference Correction Function

Setting the Time Difference

Adjust the hour hand using the crown to set the desired time difference.

Time Difference Setting Indicator

Second hand indicates SET status (difference set) or ±0 (not set).

Time Difference Correction Example

Setting London Time from Germany

Example of adjusting for a time difference between Germany and London.

London Time Adjustment Steps

Specific procedure to set the time difference for London.

Confirming and Canceling Time Difference

Confirming Time Difference Status

Check second hand position (SET or ±0) to confirm difference setting.

Canceling Time Difference Setting

Reverse the hour hand movement to return the time difference to zero.

Visualizing Time Difference Adjustments

Time Difference Set State

Illustrates second hand pointing to SET when a time difference is active.

Time Difference Canceled State

Illustrates second hand pointing to ±0 when the time difference is canceled.

Solar Power Management and Charging

Optimal Charging Practices

Keep watch charged by exposing dial to direct sunlight or strong fluorescent light.

Maintaining Charge Levels

Avoid covering the watch; place in bright locations to ensure continuous charging.

Solar Watch Functions: Power Save and Warnings

Power Save Mode Activation

Hands stop at 12:00; watch enters Power Save mode when not exposed to light.

Insufficient Charge Warning

Second hand moves at 2-second intervals to signal low battery capacity.

Charge Warnings and Prevention Features

Low Battery Warning Details

Watch stops after ~6 days of 2-second interval movement if not charged.

Overcharging Prevention

Automatically prevents battery damage from overcharging when fully charged.

Solar Watch Charging Time Reference

Charging Time by Light Intensity

Table provides charging times based on illuminance (lx) and environment.

Charging Time Definitions

Clarifies times for 1 day of operation vs. full charge from stopped state.

Handling and Charging Precautions

Charging Temperature Guidelines

Avoid charging at high temperatures to prevent watch damage.

Secondary Battery Safety

Never remove the battery; consult a physician if swallowed; use specified battery.

Setting the Watch Reference Position

Checking the Reference Position

Verify if watch hands and date are correctly aligned at their reference points.

Procedure to Set Reference Position

Steps to correct hand and date positions if they are misaligned.

Reference Position Correction Steps

Adjusting Hour Hand and Date

Set date to 31/1 and hour hand to 12:00; continuous turning moves hands.

Adjusting Second and Minute Hands

Set second and minute hands to 00:00:00 after pulling crown to second position.

All-Reset Procedure for Watch Malfunctions

Executing the All-Reset

Pull crown to second position, press (A) and (B) simultaneously to reset.

Setting Reference Position Post-Reset

Crucial step after all-reset to ensure correct time display.

Post All-Reset Procedures and Cautions

Ensuring Correct Reference Alignment

Correct reference position setting is vital for accurate time display.

Manual Time Setting After Reset

Set time to 0:00 AM and date manually, paying attention to AM/PM.

Troubleshooting Radio Wave Reception Problems

Watch Fails to Start Reception

Check for RX standby, blocking objects, or window proximity.

Unable to Receive Waves (Within Range)

Try near window, change orientation, check reference position for issues.

Advanced Reception Troubleshooting

Stuck at Reception Standby (RX)

Check time difference setting; reset reference position if necessary.

Time Mismatch with Service

Verify reference position and correct time difference if hour hand is off.

Introduction to Slide Rule Functions

Slide Rule Overview and Operation

Used for navigation/calculations; outer scale rotated with crown.

Calculating Time Required

Example calculation for determining flight time based on speed and distance.

Slide Rule Calculation Examples (Speed, Distance)

Calculating Ground Speed

Example: calculating airplane speed given distance and flight time.

Calculating Flying Distance

Example: calculating distance flown based on speed and duration.

Slide Rule Calculations (Fuel, Flight Hours)

Calculating Fuel Consumption Rate

Example: determining fuel used per hour from total fuel and time.

Calculating Maximum Flying Hours

Example: determining total flight time based on fuel capacity and consumption.

Slide Rule for Conversions and Basic Math

Converting Statute Miles

Example: converting miles to nautical miles and kilometers.

General Multiplication and Division

Demonstrates performing multiplication and division using the slide rule.

Slide Rule for Ratios and Square Roots

Reading Proportional Ratios

Shows how to read ratios and proportions on the scales.

Calculating Square Roots

Example of finding the square root of a number using the slide rule.

Watch Precautions and Water Resistance Guide

Water Resistance Ratings

Table detailing water resistance levels and their corresponding use cases.

Examples of Water Use

Visual guide showing acceptable vs. unacceptable water exposure for each rating.

Water Resistance Details and Cleaning Advice

Understanding Water Resistance Levels

Explains resistance for daily use (3 atm), upgraded (5 atm), and skin diving (10/20 atm).

Watch Cleaning Instructions

How to clean the watch case, crystal, and bands; avoid solvents.

Operating Environment and Maintenance Cautions

Temperature and Environment Limits

Use within specified temperature range; avoid magnets and static electricity.

Periodic Inspection and Servicing

Recommends inspections every 2-3 years for safety and continued water resistance.

Technical Specifications Summary

Model, Type, and Timekeeping Accuracy

Specifies model (H461), type (analog solar), and accuracy (±15 sec/month).

Key Functions and Operating Range

Lists operating temperature (-10°C to +60°C) and major functions.