1. Introduction
This manual provides detailed instructions for the proper setup, operation, and maintenance of your U.S. Solid 1mg Analytical Balance. Designed for high precision measurements, this digital lab scale features two LCD screens, RS232 and USB interfaces, and a durable glass windshield. Please read this manual thoroughly before use to ensure accurate results and safe operation.
Figure 1: U.S. Solid 1mg Analytical Balance with its dual LCD screens and protective draft shield.
2. Package Contents
Verify that all items are present and undamaged upon unpacking:
- U.S. Solid 1mg Analytical Balance
- Stainless Steel Weighing Pan
- Glass Draft Shield (3 slide-doors)
- Calibration Weight (e.g., 500g for 300g model)
- Power Adapter (AC 100V-240V)
- User Manual
Figure 2: Included components: analytical balance, user manual, calibration weight, and power adapter.
3. Setup
Proper setup is crucial for accurate measurements.
- Placement: Place the balance on a stable, vibration-free surface, away from direct sunlight, air currents, and significant temperature changes.
- Horizontal Adjustment: Use the adjustable leveling feet at the base of the scale to center the bubble in the built-in level indicator. This ensures the weighing pan is perfectly horizontal.
- Assembly: Carefully place the stainless steel weighing pan onto the center of the weighing platform. Ensure the glass draft shield is properly assembled around the weighing area.
- Power Connection: Connect the power adapter to the balance and plug it into an AC 100V-240V power outlet. Alternatively, the scale can be powered by 4x1.5V batteries (not included) for portable use.
- Warm-up Time: After powering on, allow the balance to warm up for at least 30 minutes before making critical measurements. This stabilizes the internal components for optimal accuracy.
Figure 3: Key setup considerations including leveling, environmental factors, and warm-up period.
4. Operating Instructions
4.1 Basic Weighing
- Press the ON/OFF button to power on the balance.
- Wait for the display to show 0.000g.
- Place the item to be weighed on the center of the stainless steel pan.
- Read the stable weight displayed on the LCD screen.
4.2 Tare Function
To subtract the weight of a container:
- Place the empty container on the weighing pan.
- Press the TARE/CAL button. The display will reset to 0.000g.
- Add the substance to be weighed into the container. The display will show the net weight of the substance.
4.3 Unit Conversion
The balance supports 19 measuring units. To change the unit:
- Press the UNIT button repeatedly to cycle through available units (Gram, Kilogram, Carat, Tola, TAR, Dram, PKT, Grain, TMR, gsm, tlJ, mo, Penny weight, Ounce, Pound, Taiwan Tael, Troy-Ounce, Hong Kong Tael, and %).
- You can lock up to 16 different unit packages (e.g., g, t, ct, oz, lb) and hide uncommon units for efficiency. Refer to the full manual for detailed unit locking procedures.
Figure 4: Available measuring units for the analytical balance.
4.4 Piece Counting Function
To count multiple pieces of an item:
- Press the PCS button to enter piece counting mode.
- Follow the on-screen prompts to set a sample quantity (e.g., 10, 20, 50, 100 pieces).
- Place the corresponding number of sample pieces on the pan and confirm.
- Remove the sample pieces. When you place an unknown quantity of the same item, the display will show the count.
Figure 5: Piece counting function in operation.
4.5 Data Output (RS232 & USB)
The lab scale is equipped with RS232 and USB ports for connecting to a computer or printer. It supports three printing modes: continuous print, key print, and command print.
For detailed instructions on configuring continuous output or key output settings, please refer to the video demonstration below.
Video 1: Demonstration of standard calibration, linear calibration, continuous output setting, and key output setting for the U.S. Solid Analytical Balance.
5. Calibration
Calibration ensures the accuracy of your balance. It is recommended to recalibrate after moving the balance or before critical use.
5.1 Manual Calibration
To perform a manual calibration:
- Ensure the weighing pan is empty.
- Press and hold the TARE/CAL button until 'CAL' appears on the display.
- The display will then show the required calibration weight (e.g., 500.000g).
- Carefully place the specified calibration weight onto the center of the weighing pan.
- Wait for the balance to stabilize and confirm the calibration. The display will return to 0.000g once complete.
- Remove the calibration weight.
5.2 Standard and Linear Calibration
For detailed steps on performing standard and linear calibration, please refer to the video demonstration in Section 4.5.
6. Specifications
| Feature | Specification |
|---|---|
| Brand | U.S. Solid |
| Model Number | USS-DBS58-3 |
| Weight Limit | 300 Grams |
| Accuracy | 0.001g (1mg) |
| Display Type | LCD (2 screens) |
| Material | Glass, Stainless Steel |
| Interfaces | RS232, USB |
| Power Supply | AC 100V-240V or 4x1.5V Battery (not included) |
| Product Dimensions | 12.6 x 7.48 x 11.02 inches |
| Item Weight | 8.28 pounds |
| Special Features | Overload protection, checking weighing, piece counting, percentage function, tare function, fault display, manual calibration, glass windshield with 3 slide-doors, 9 cm diameter oversized stainless steel pan. |
7. Maintenance
To ensure the longevity and accuracy of your analytical balance:
- Keep the balance clean. Wipe surfaces with a soft, damp cloth. Avoid abrasive cleaners or solvents.
- Do not overload the balance beyond its maximum capacity.
- Store the balance in a dry, stable environment when not in use.
- Regularly check the leveling bubble and adjust if necessary.
8. Warranty and Support
For warranty information, technical support, or service inquiries, please contact U.S. Solid customer service. Refer to the product packaging or the official U.S. Solid website for contact details.
