Q: How often does the SPC373 sync with the atomic clock?
A: It attempts syncing at 12:00 AM, 1:00 AM, 2:00 AM, and 3:00 AM. It will also retry if the signal is weak.
Q: Can I disable the atomic sync and use only manual mode?
A: Yes. Set the clock manually, and it will not overwrite until you force a WWVB search.
Q: Does the clock work internationally?
A: The WWVB signal is only for North America (USA and parts of Canada). Outside this range, use manual mode. sharp atomic clock spc373 user manual
Q: Why is my humidity reading higher than my other hygrometer?
A: The sensor takes time to stabilize after battery change (24 hours). Also, ensure the clock is not near a humidifier or bathroom.
Q: The snooze is too short. Can I change it?
A: No. The SPC373 snooze is fixed at 5 minutes. Q: How often does the SPC373 sync with the atomic clock
Solution: Low battery. Replace immediately. Alkaline batteries only.
The Sharp SPC373 is a radio-controlled (atomic) mantel clock that automatically synchronizes time using the standard WWVB/NIST signal (North America) or similar longwave time signals where supported. This guide summarizes setup, daily use, features, maintenance, and troubleshooting so you can quickly get accurate timekeeping. Solution: Low battery
While the clock will set itself automatically, you must input your Time Zone and Daylight Saving Time preference manually.
If you cannot receive the atomic signal (e.g., remote area, interference), set the time manually.
Button reference (exact labels may vary slightly – typical for Sharp):