SIGMA BC 1200 Baseline Computer User Manual

1. Introduction

The SIGMA BC 1200 Baseline Computer is a wired bicycle computer designed to provide essential cycling data. It features functions for speed, time, and distance, helping you track your rides effectively. This manual will guide you through the installation, operation, and care of your device.

Figure 1: Front view of the SIGMA BC 1200 Baseline Computer, displaying current speed, trip time, and other metrics.

2. Setup and Installation

Proper installation is crucial for accurate readings. Follow these steps carefully:

1. Mounting the Bracket: Attach the computer bracket to your handlebar or stem using the provided zip ties or rubber bands. Ensure it is securely fastened and positioned for easy viewing.
2. Installing the Speed Sensor: Mount the speed sensor on the front fork, ensuring it is aligned with the spokes. The sensor should be positioned so that the magnet, when attached to a spoke, passes directly in front of the sensor's marked area.
3. Attaching the Magnet: Securely attach the spoke magnet to one of the spokes on your front wheel. Adjust its position so that it passes within 5mm of the speed sensor with each wheel rotation.
4. Connecting the Cable: Route the sensor cable along the fork and brake cable, securing it with zip ties to prevent interference with moving parts. Plug the cable into the computer bracket.
5. Inserting the Computer: Slide the BC 1200 computer unit into the bracket until it clicks into place.
6. Wheel Size Setting:

   To ensure accurate speed and distance measurements, you must set the correct wheel circumference. Refer to the table below or measure your wheel's circumference in millimeters.

   Common Wheel Circumferences (mm)

   Wheel Size	Circumference (mm)
   16 inch	1272
   20 inch	1596
   26 inch	2070
   27 inch	2155
   28 inch / 700C	2240
   29 inch	2330

   To enter the wheel size, press and hold the main button until the setting mode appears. Use the button to adjust the value and confirm.

Figure 2: Side view of the SIGMA BC 1200, illustrating its compact design and wired connection.

3. Operating Instructions

The SIGMA BC 1200 features a simple interface for easy navigation through its functions.

3.1. Button Functions

• Main Button (usually on the bottom or front): Press to cycle through functions. Press and hold to enter setting mode or reset certain values.

3.2. Available Functions

The BC 1200 provides the following key metrics:

• Current Speed: Displays your real-time speed in km/h or mph.
• Average Speed: Shows the average speed for your current trip.
• Maximum Speed: Records the highest speed achieved during your current trip.
• Speed Trend: Indicates whether your current speed is above or below your average speed.
• Trip Distance: Measures the distance covered for your current ride.
• Total Distance: Accumulates the total distance covered by the computer since its last reset (or battery change).
• Trip Time: Records the duration of your current ride.
• Total Travel Time: Accumulates the total time the computer has been active.
• Clock: Displays the current time.

3.3. Resetting Trip Data

To reset trip-specific data (e.g., Trip Distance, Trip Time, Average Speed, Max Speed), navigate to the desired function and press and hold the main button until the value resets to zero. Total distance and total travel time are typically not reset with this action and require a battery change or specific reset procedure (refer to troubleshooting if needed).

4. Maintenance

To ensure the longevity and accuracy of your SIGMA BC 1200, follow these maintenance guidelines:

• Cleaning: Wipe the computer unit and sensor with a soft, damp cloth. Do not use abrasive cleaners or solvents.
• Battery Replacement: The BC 1200 uses a Lithium Metal battery (included). When the display becomes dim or erratic, it's time to replace the battery. Carefully open the battery compartment, replace the old battery with a new one of the same type, and ensure the seal is properly seated before closing. Note that replacing the battery may reset total distance and time, depending on the model and duration of power loss.
• Cable and Sensor Check: Periodically inspect the sensor cable for any damage or fraying. Ensure the sensor and magnet remain securely mounted and properly aligned.
• Storage: If storing the bicycle for an extended period, remove the computer unit from its bracket to conserve battery life.

Figure 3: Angled view of the SIGMA BC 1200, showing the display and the "1200" model number on the side.

5. Troubleshooting

If you encounter issues with your BC 1200, try the following solutions:

6. Specifications

Key technical specifications for the SIGMA BC 1200 Baseline Computer:

• Model: SIGMA BC 1200 (Model Number: 01950)
• Manufacturer: SIGMA
• Display Type: LCD
• Screen Size: 1.9 Inches
• Sensor Type: Wired Speed Sensor
• Power Source: 1 x Lithium Metal Battery (included)
• Item Weight: Approximately 68 g
• Product Dimensions: Approximately 30 x 30 x 30 cm (computer unit)
• Functions: Current Speed, Average Speed, Maximum Speed, Speed Trend, Trip Distance, Total Distance, Trip Time, Total Travel Time, Clock.

7. Warranty and Support

For warranty information and customer support, please refer to the official SIGMA website or contact your local retailer. Specific warranty terms and conditions may vary by region and purchase date. Please retain your proof of purchase for warranty claims.

For further assistance, you may visit the SIGMA Store on Amazon.