Acu-Rite 615 Atomic Clock, Set the Time & Date, Select Measurement Units, U.S. Standard Units

Atomic Clock

AcuRite atomic clocks use a radio-controlled signal to synchronize to the correct time broadcast by the National Institute of Standards and Technology (NIST) Radio Station WWVB, located near Fort Collins, Colorado. WWVB broadcasts the current time and date with split-second accuracy.

The atomic clock and calendar will maintain the correct time and date, and automatically update for daylight saving time to provide the most accurate timekeeping standard possible.

Please note: Signal reception is normally better at night and when the weather is clear. The atomic signal generally takes a few hours to synchronize, so it is important to manually set the time and date after powering on the display.

Set the Time & Date

Press and hold the “SET” button, located on the back of the display unit, for 3 seconds to enter SET MODE. Once in set mode, the preference you are currently setting will blink on the display.

To adjust the currently selected (flashing) item, press and release the “+” or “–“ buttons (press and HOLD to fast adjust).

To save your adjustments, press and release the “SET” button again to adjust the next preference. The preference set order is as follows:

TIME ZONE ( EST AST HAT AKT PST MST CST ) DST (Daylight Saving Time ON or OFF)

CLOCK HOUR

CLOCK MINUTE

CALENDAR YEAR CALENDAR MONTH CALENDAR DATE

You will automatically exit SET MODE if no buttons are pressed for 30 seconds. Enter setup mode at any time by pressing and holding the “SET” button.

Select Measurement Units

To select between U.S. standard units or imperial units, press the “SCALE” button, located on the back of the display unit.

Measurement	U.S. Standard Units	Imperial Units
Temperature	Degrees Fahrenheit (ºF)	Degrees Celsius (ºC)
Barometric Pressure	inHg (inches of mercury)	hPa (Hectopascal)
Wind Speed	Miles per hour (mph)	Kilometers per hour (kph)

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