Sharp Atomic Clock Spc373 User Manual -

The Sharp SPC373 Atomic Clock is a radio-controlled device that automatically synchronizes with the WWVB signal from Fort Collins, Colorado, to maintain precise time. It also provides indoor/outdoor temperature and dual alarm functions. Initial Setup & Quick Start

Batteries: Insert three fresh AAA alkaline batteries into the clock's battery compartment, ensuring they match the polarity (+/-) markings. Outdoor Sensor:

Insert batteries into the remote sensor and set it to Channel 1.

On the back of the clock, use the Channel button to select "1" to match the sensor.

Place the sensor within 30 meters (approx. 100 feet) of the clock.

Time Zone: Press the TIME button once until the time zone flashes. Use the UP/DOWN (or Hour) buttons to cycle to your local zone (e.g., Eastern, Central, Mountain, Pacific) and press TIME again to confirm.

Daylight Saving Time (DST): Ensure the DST switch is set to ON if you are in an area that observes it. Setting Time and Date Manually

If the atomic signal is weak, you can set the clock manually: Enter Mode: Press and hold the TIME button for 2 seconds. sharp atomic clock spc373 user manual

Adjust Values: When the digits flash, use the UP and DOWN buttons to change the Year, Month, Date, Hour, and Minutes.

Confirm: Press TIME after each adjustment to move to the next setting and to save once finished. Alarm Functions

Set Alarm: Press the ALM ON/OFF button to enter Alarm 1 or Alarm 2 mode. Press and hold ALM ON/OFF until the hour flashes, adjust with UP/DOWN, and press again to set minutes.

Activate/Deactivate: Press the ALM ON/OFF button in normal time mode to toggle the alarms on or off.

Temperature Pre-Alarm: This feature sounds the alarm 30 minutes early if the outdoor temperature drops below -3.0∘Cnegative 3.0 raised to the composed with power C ( -26.0∘Fnegative 26.0 raised to the composed with power F ). Troubleshooting

No Atomic Sync: It can take up to 24 hours to synchronize. For better results, place the clock near a window overnight, facing Colorado.

Forced Sync: Press and hold the UP button (or "Wave" button if labeled) for 3 seconds to manually trigger a signal search. Outdoor Temp Not Displaying: Ensure the sensor and clock are on the same channel. The Sharp SPC373 Atomic Clock is a radio-controlled

Reset the connection by removing batteries from both units for 30 minutes, then re-inserting them (clock first, then sensor).

Spinning Hands: In analog models, randomly spinning hands usually indicate a low battery.

For additional assistance, you can contact the manufacturer, M.Z. Berger & Company, at 1-800-221-0131. Sharp atomic clock spc373

The Sharp Atomic Clock SPC373 Go to product viewer dialog for this item.

is a versatile digital clock featuring a contemporary, irregular silver design that functions as both a timekeeper and a thermometer. While it is generally praised for its large, easy-to-read display, some users find the initial setup and sensor maintenance to be technical. Key Features & Performance

Automatic Synchronization: The clock is designed to automatically sync with the WWVB radio signal from Fort Collins, CO, ensuring precise timekeeping without manual adjustment.

Comprehensive Display: It shows the time in large digits alongside the date, day of the week, and both indoor and outdoor temperatures. Temperature range: 32°F to 122°F (0°C to 50°C)

Customizable Settings: Supports seven time zones (Atlantic to Hawaii) and 12/24-hour formats.

Dual Alarms: Features a dual-alarm design with a snooze function and a "temperature pre-alarm" that can sound 30 minutes early if outdoor temperatures drop below -3°C. Operational Highlights from the Manual

According to the Sharp SPC373 instruction manual, effective operation depends on correct initial configuration: Sharp atomic clock spc373

8. Temperature & Humidity Functions

The built-in sensor updates every 30 seconds.

  • Temperature range: 32°F to 122°F (0°C to 50°C)
  • Humidity range: 20% to 95% RH
  • Accuracy: ±2°F / ±1°C; Humidity ±5% RH

Problem: Clock is 7 hours behind

Solution: You are in the wrong time zone. Press and hold SET until you reach the "ZONE" setting. Change from "P" to "E" if you live in New York.

Unboxing & Initial Inspection

When you open the box, verify you have the following components:

  • The main unit (SPC373 display)
  • Instruction manual (often a single sheet – keep this article for reference)
  • Batteries (Usually requires 2-3 x AA or AAA batteries; check your unit’s battery door)

Important: Do not use rechargeable batteries (NiMH) for initial setup, as they provide lower voltage (1.2V vs 1.5V) which can hinder the signal search.

To enable/disable Alarm 1:

  • Press ALARM 1 briefly to view alarm time.
  • While viewing, press + to toggle the alarm ON or OFF. A bell icon appears when on.

11. Care and Maintenance

To ensure your Sharp SPC373 lasts for years:

  • Clean the housing with a soft, dry cloth. Do not use solvents, alcohol, or ammonia.
  • Replace batteries yearly – Even if they work, leaking batteries damage electronics.
  • Avoid extreme temperatures – Do not leave in a car or near a heater.
  • Wall mounting: If mounting on a wall, use a screw (not included) that fits the back keyhole. Ensure the clock is level for accurate temperature reading.
  • Resetting after battery change: Always let the clock sit for 10 minutes after inserting new batteries before touching buttons.

Quick reference — common buttons

  • SET / MODE — enter setting mode
  • UP / DOWN / + / - — change values
  • ALARM — set/enable alarm
  • SNOOZE / LIGHT — snooze alarm or turn on backlight
  • SYNC / RC — force radio synchronization
  • 12/24 or FORMAT — toggle hour format

Problem: Battery icon blinking

Solution: Low battery. Replace immediately. Alkaline batteries only.