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Casio 5242, Operation Manual, Page: 8 / 11

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E-56

Calibrating the Barometric Pressure Sensor Reading

The pressure sensor of this watch is adjusted at the factory and so further adjustment is not required by 
you. However, if you notice that the pressure readings produced by the watch are different from readings 
produced by another instrument, you can use the procedure in this section to make corrections.

Important!

The watch will not be able to produce correct pressure readings if you make a mistake during the 
correction procedure. Check to make sure that the value you use for correction produces correct pressure 
readings.

To calibrate the Barometric Pressure Sensor Reading

1. In the Barometer Mode, loosen the crown and then pull it out.

•

 If the watch is currently performing a barometric pressure reading 

operation, the hands will move to indicate the current barometric 
pressure.

•

 If the hands do not indicate a barometric pressure, pulling out the 

crown will take a barometric pressure reading. The 

z

z

Hour Hand

,

x

x

Minute Hand

, and 

c

c

Second hand

 will indicate the result after 

about 10 seconds.

30

Example:

 999 hPa

30

Example:

 999 hPa

E-57

2. Rotate the crown to move the hands so they match the barometric 

pressure reading produced by another instrument.

•

 Rotating the crown causes the 

c

c

Second Hand

 to move in 1 hPa 

(0.1 inHg) increments.

•

 After you calibrate the barometric pressure sensor reading, you 

can clear calibration settings any time by performing step 1 of this 
procedure and then pressing 

A

 and 

C

 at the same time. This 

will cause the hands to move to the result of the last barometric 
pressure reading the watch performed.

•

 You can toggle the barometric pressure unit between hPa and inHg 

at this time by holding down 

C

 for two seconds.

3. After the setting is the way you want, push the crown back in and then 

lock it.

•

 For information about the barometric pressure calibration value 

range, see the barometric pressure display range on page E-53.

Barometric Pressure Reading Precautions

•

 Sudden changes in temperature can affect the pressure sensor and produce errors in reading values.

30

Example:

 1000 hPa

30

Example:

 1000 hPa

E-58

Taking Temperature Readings

The Thermometer Mode uses a temperature sensor to take temperature readings. The result of a 
temperature reading is indicated by the hands of the watch.

Hand Indicators

z

Hour Hand:

When the unit is Celsius (°C), indicates the 10s digit value. When the unit is Fahrenheit (°F), 
indicates the 100s digit value.

x

Minute Hand:

When the unit is Celsius (°C), indicates the 1s digit value. When the unit is Fahrenheit (°F), 
indicates the 10s digit value.

c

Second Hand:

When the unit is Celsius (°C), indicates the fi rst digit value to the right of the decimal 
point. When the unit is Fahrenheit (°F), indicates the 1s digit value.

v

Mode Hand:

When the unit is Celsius (°C) and the reading is 0°C or above, points to 

THERMO °C

.

When the reading is below 0°C, points to 

THERMO [–]

. When the unit is Fahrenheit (°F), 

points to 

THERMO °F

.

30

30

Example:

 25.3°C

Example:

 62°F

E-59

To take a temperature reading

1. Enter the Timekeeping Mode.

•

 For information about changing modes, see “Selecting a Mode” 

(page E-24).

2. Press 

B

 twice.

•

 The 

v

v

Mode Hand

 will move to 

THERMO °C

 or 

THERMO °F

.

This indicates the currently selected temperature unit setting. 
For information about how to change the setting, see “To specify 
altitude, barometric pressure, and temperature units” (page E-62).

•

 The 

c

c

Second Hand

 will move to 0 indicating that the temperature 

reading operation has started. The reading result will appear within 
eight seconds.

Note

•

 The unit for temperature readings by this watch is 0.1°C (1°F).

•

 The measurement range for temperature readings by this watch is 

–10.0°C to 60.0°C (14°F to 140°F).

•

 Whenever a temperature reading is outside the allowable measurement 

range, the hands of the watches will move to the positions below.

z

z

Hour Hand, 

x

x

Minute Hand, 

c

c

Second Hand: 

11 o’clock

v

v

Mode Hand: 

THERMO °C

 or 

THERMO °F

30

30

30

30

E-60

Calibrating the Temperature Sensor Reading

The temperature sensor of this watch is adjusted at the factory and so further adjustment is not required 
by you. However, if you notice that the readings produced by the watch are different from readings 
produced by another instrument, you can use the procedure in this section to make corrections.

Important!

•

 The watch will not be able to produce correct temperature readings if you make a mistake during the 

correction procedure. Check to make sure that the value you use for correction produces correct 
temperature readings.

•

 Before performing the procedure below, remove the watch from your wrist leave it in the area where 

you will take the reading for about 20 to 30 minutes to allow the case temperature to become the same 
as surrounding air temperature.

To calibrate the temperature sensor reading

1. In the Thermometer Mode, loosen the crown and then pull it out.

•

 If the watch is currently performing a temperature reading operation, the hands will move to indicate 

the current temperature.

•

 If the hands do not indicate a temperature, pulling out the crown will take a temperature reading. 

The hands will indicate the result after about 8 seconds.

2. Rotate the crown to move the hands so they match the temperature reading produced by another 

instrument.

•

 Rotating the crown causes the 

c

c

Second Hand

 to move in 0.1°C (1°F) increments.

•

 After you calibrate the temperature sensor reading, you can clear it any time by performing step 1 of 

this procedure and then pressing 

A

 and 

C

 at the same time. This will cause the hands to move to 

the result of the last temperature reading the watch performed.

•

 You can toggle the temperature unit between Celsius (°C) and Fahrenheit (°F) at this time by holding 

down

C

 for two seconds.

E-61

30

30

Example:

 29.9°C

Example:

 30.0°C

3. After the setting is the way you want, push the crown back in and then lock it.

For information about the temperature calibration value range, see the temperature display range on 
page E-59.

Temperature Reading Precautions

•

 Temperature readings are affected by your body temperature, direct sunlight, and moisture. To achieve 

a more accurate temperature readings, remove the watch from your wrist, place it in a well ventilated 
location out of direct sunlight, and wipe all moisture from the case. It takes approximately 20 to 30 
minutes for the case of the watch to reach the actual surrounding temperature.

E-62

Specifying Altitude, Barometric Pressure, and Temperature Units

Use the procedure below to specify the altitude, barometric pressure, and temperature units to be used in 
the Altimeter Mode, Barometer Mode and the Thermometer Mode.

To specify altitude, barometric pressure, and temperature units

1. Make sure the watch is the the mode for the type of unit you want to 

specify (Altimeter, Barometer, or Thermometer Mode).

•

 For information about changing modes, see “Selecting a Mode” 

(page E-24).

2. After loosening the crown, pull it out.

•

 The 

v

Mode Hand

 will move to the currently selected unit setting.

3. Hold down 

C

 for about two seconds to toggle between the available 

unit settings.

When specifying this type of unit:

Press 

C

 to toggle between these settings:

Altitude

m

 (meters) and 

ft

 (feet)

Barometric Pressure

hPa

 (hectopascals) and 

inHg

 (inches of mercury)

Temperature

°C

 (Celsius) and 

°F

 (Fahrenheit)

4. After the setting is the way you want, push the crown back in and lock it.

30

30

E-63

Using the Alarm

When the alarm is turned on, an alarm will sound for about 10 seconds each day when the time in the 
Timekeeping Mode reaches the preset alarm time. This is true even if the watch is not in the Timekeeping 
Mode.

Hand Indicators

z

Hour Hand: 

Indicates the currently set alarm time hour.

x

Minute Hand: 

Indicates the currently set alarm time minute.

c

Second Hand: 

Indicates the current a.m. (

A

) and p.m. (

P

) setting.

v

Mode Hand:

Indicates the current alarm on (

ALM ON

) and off 

(

ALM OFF

) setting.

To change the alarm time setting

1. Use 

B

 to select the Alarm Mode (ALM) as shown on page E-24.

•

 The 

v

Mode Hand

 will move to 

ALM ON

 or 

ALM OFF

 to indicate 

the current setting. The 

c

Second Hand

 indicates the current 

A

 (a.m.) 

or

P

 (p.m.) setting.

2. After loosening the crown, pull it out.

•

 The 

v

Mode Hand

 will move to 

ALM ON

.

•

 You can toggle between the hour and minute setting mode, and the 

hour only setting mode by pressing 

B

.

30

30

Operation Guide 5242

Summary of Contents for 5242

Page 1: ...nearby illustration Outer ring Outer ring Inner ring Inner ring E 4 To pull the crown out After loosening the crown pull it out The watch will beep when you pull the crown out To rotate the crown Rotating the crown after you pull it out will move the watch s hands You also can move the hands at high speed by performing the operation described below To start high speed hand movement With the crown ...

Page 2: ...o light can cause power to run down Make sure that the watch is exposed to bright light whenever possible Power Levels You can get an idea of the watch s power level by observing the movement of the c c Second Hand in the Timekeeping Mode If the c c Second Hand is moving smoothly at one second intervals power is at Level 1 If the c c Second Hand is jumping at two second intervals power is at Level...

Page 3: ...performs the receive operation each day automatically up to six times up to five times for the Chinese calibration signal between the hours of midnight and 5 a m When any receive operation is successful none of the other receive operations for that day are performed When a calibration time is reached the watch will perform the receive operation The receive operation is not performed if a calibratio...

Page 4: ...alibration signal you need to switch manually Note Daylight saving time DST or summer time as it is known in some countries calls for setting clocks ahead one hour from standard time during the summer season Note that the period during which and the areas where Daylight saving time is applied depend on each country Some countries or geographic areas may not use summer time Standard Time and Daylig...

Page 5: ...th For information about magnetic north see Compass Precautions page E 41 The c c Second Hand will continue to move for about 20 seconds after you start the digital compass operation as it adjusts its magnetic north reading After that the hand will stop at the final reading To update a reading press C again 3 Press B to return to the Timekeeping Mode Calibrating the Bearing Sensor Reading You shoul...

Page 6: ...titude value 400 A B 400 A B E 43 Hand Indicators z z Hour Hand Indicates the 1000s digit value x x Minute Hand Indicates the 100s digit value c c Second Hand Indicates the 10s digit value v v Mode Hand Indicates the altitude unit as meters ALTIMETER m or feet ALTIMETER ft The hand will point to ALTIMETER in the case of a negative reading or to ALTIMETER 1 x 10000 for 10 000 feet 2 x 10000 for 20 ...

Page 7: ...re reading 1 Enter the Timekeeping Mode For information about changing modes see Selecting a Mode page E 24 2 Press B once The v v Mode Hand will move to BAROMETER hPa or BAROMETER inHg This indicates the currently selected barometric pressure unit setting For information about how to change the setting see To specify altitude barometric pressure and temperature units page E 62 The c c Second Hand...

Page 8: ...y and so further adjustment is not required by you However if you notice that the readings produced by the watch are different from readings produced by another instrument you can use the procedure in this section to make corrections Important The watch will not be able to produce correct temperature readings if you make a mistake during the correction procedure Check to make sure that the value y...

Page 9: ...is not centered in the b b Day Indicator window rotate the crown to center it Quickly rotating the crown at this time will cause high speed movement of the b b Day Indicator Note that high speed reverse movement is also supported To stop high speed movement rotate the crown again in the opposite direction 4 After the b b Day Indicator setting is the way you want push the crown back in and then loc...

Page 10: ...tions nearby strong magnetism can cause an error to be indicated If the error is indicated during a measurement restart the measurement If an error is indicated when you restart the measurement it probably means that there is a problem with the sensor or internal circuitry Whenever you have a sensor malfunction take the watch to your original dealer or nearest authorized CASIO distributor as soon ...

Page 11: ...l 2 90 ft ft Effect of variable temperature 0 to 6000 m 0 to 19680 ft 50 m every 10 C 170 ft every 50 F 5 hPa every 10 C 0 148 inHg every 50 F 6000 to 10000 m 19680 to 32800 ft 70 m every 10 C 230 ft every 50 F Values are guaranteed for a temperature range of 10 C to 40 C 14 F to 104 F Precision is lessened by strong impact to either the watch or the sensor and by temperature extremes Temperature ...

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