1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of the GODIYMODULES 4 Bit 0.36 inch Mini Digital Voltmeter. This device is designed for accurate DC voltage measurement within a range of 0.000V to 100.0V. Please read this manual thoroughly before use to ensure proper functionality and safety.
2. Product Features
- High precision voltage measurement.
- Clear 0.36 inch 4-digit LED display.
- Compact size for easy integration into various projects.
- Wide operating voltage range (4-30V DC).
- Fast refresh rate of 3 times per second.
3. Package Contents
Each package contains the following items:
- 3 x Mini Digital Voltmeters (1 Red, 1 Green, 1 Blue LED display)
Image 3.1: Three mini digital voltmeters included in the package, featuring red, green, and blue LED displays.
4. Specifications
| Measuring Range | DC 0.000V - 100.0V |
| Display Mode | 0.36 inch 4-digit LED digital tube |
| Operating Voltage | DC 4V - 30V (Recommended: 5V - 12V) |
| Power Consumption | ≤20mA |
| Refresh Rate | 3 times / second |
| Test Accuracy | 0.3% (Maximum error = Range x 0.003) |
| Product Dimensions | 40.53mm × 14.43mm × 10.68mm |
| Mounting Aperture | 2.9mm |
| Lead Length | 20cm |
Image 4.1: Detailed dimensions of the voltmeter module and its wiring diagram.
5. Setup and Wiring
The voltmeter features a 3-wire connection system. Proper wiring is crucial for correct operation and to prevent damage to the device.
5.1 Wire Definitions
- Red Wire: Working Power Positive (Connect to the positive terminal of the power supply for the voltmeter itself, typically 4-30V DC).
- Black Wire: Common Negative (Connect to the negative terminal of both the working power supply and the circuit being measured).
- Blue Wire: Test Power Positive (Connect to the positive terminal of the voltage source you wish to measure, 0-100V DC).
5.2 Wiring Diagram
Refer to the diagram below for correct wiring connections:
Image 5.1: Wiring diagram illustrating the connection of the red, black, and blue wires to the meter power and test power sources.
Important: Ensure that the operating voltage for the voltmeter (Red and Black wires) is within the 4-30V DC range. The voltage being measured (Blue and Black wires) can be up to 100V DC. Connect the black wire to the common ground of both power sources if they are separate.
5.3 Calibration Fine-Tuning
The voltmeter includes a calibration fine-tuning potentiometer on the PCB. If minor adjustments to the reading accuracy are required, use a small screwdriver to carefully turn the potentiometer. This should only be done if you have a known accurate voltage reference for comparison.
Image 5.2: View of the voltmeter's circuit board, highlighting the calibration fine-tuning component.
6. Operation
Once properly wired and powered, the voltmeter will automatically display the measured DC voltage on its 4-digit LED screen. No further user interaction is typically required for basic voltage monitoring.
- The display will show the voltage in Volts (V) with three decimal places for precision (e.g., 12.345V).
- Ensure the measured voltage does not exceed 100.0V DC to prevent damage.
Image 6.1: Examples of the voltmeter in operation, displaying readings with red, green, and blue LED colors.
7. Troubleshooting
- No Display:
- Check if the working power supply (Red and Black wires) is connected correctly and providing 4-30V DC.
- Ensure the black wire is properly connected to the negative terminal.
- Verify that the power supply is active.
- Incorrect Reading:
- Confirm that the blue wire is connected to the correct positive terminal of the voltage source being measured.
- Ensure the black wire is common to both the meter's power and the measured voltage source.
- If a slight offset is observed, use the calibration fine-tuning potentiometer (refer to Section 5.3) with a known accurate reference.
- Verify the measured voltage is within the 0-100V DC range.
- Flickering Display:
- Check for unstable power supply to the voltmeter (Red and Black wires).
- Ensure connections are secure and free from intermittent contact.
8. Maintenance
The GODIYMODULES Mini Digital Voltmeter is designed for low maintenance. Follow these guidelines to ensure longevity:
- Keep the device clean and free from dust and moisture.
- Avoid exposing the voltmeter to extreme temperatures or direct sunlight.
- Do not apply excessive force to the wires or the PCB.
- Store in a dry, cool environment when not in use.
9. Warranty and Support
For warranty information or technical support, please contact your retailer or the manufacturer, GODIYMODULES. Keep your purchase receipt as proof of purchase.
Manufacturer: GODIYMODULES
Part Number: 4Bit-036-001