WELDRIC DSN-VC288 DC Voltmeter Ammeter User Manual

1. Introduction

Thank you for choosing the WELDRIC DSN-VC288 DC Voltmeter Ammeter. This device is a compact, high-precision digital meter designed for simultaneously displaying DC voltage and current. It features a clear LED display and is suitable for various applications including electrical circuits, machinery, and DIY projects. Please read this manual thoroughly before installation and operation to ensure safe and correct usage.

2. Safety Information

Always observe the following safety precautions to prevent injury or damage to the device:

• Ensure the power supply is disconnected before making any wiring connections.
• Do not exceed the maximum specified voltage (DC 100V) or current (10A/50A/100A depending on model variant).
• This device is designed for DC circuits only. Do not connect to AC power.
• Handle with care to avoid physical damage.
• Keep out of reach of children.
• If the device appears damaged or malfunctions, discontinue use immediately.

3. Product Overview

The WELDRIC DSN-VC288 is a dual-display digital meter. It typically features two LED displays, one for voltage (V) and one for current (A), along with connection terminals for power and measurement.

Figure 3.1: Front view of the WELDRIC DSN-VC288 DC Voltmeter Ammeter, showing the dual LED display for voltage and current.

Figure 3.2: The DSN-VC288 meter with its associated wiring harnesses for power and measurement connections.

Figure 3.3: Example of the dual LED display, showing voltage in red and current in blue (color may vary by model variant).

4. Specifications

The following table outlines the technical specifications for the WELDRIC DSN-VC288 DC Voltmeter Ammeter:

Figure 4.1: Typical dimensions of the DSN-VC288 DC Voltmeter Ammeter (measurements in millimeters).

5. Setup and Wiring

Proper wiring is crucial for the correct and safe operation of the DSN-VC288. The meter typically comes with two wiring harnesses: a thin three-wire cable for power supply and voltage measurement, and a thick two-wire cable for current measurement (shunt connection).

Figure 5.1: The two wiring harnesses: thin three-wire for power/voltage, thick two-wire for current shunt.

5.1 Wiring Diagram (General)

While specific wiring can vary slightly by model variant (especially for current ranges), the general principle is as follows:

• Thin Three-Wire Cable:
  • Red (thin): Positive power supply for the meter (DC 4.5-30V).
  • Black (thin): Negative power supply for the meter and common ground for voltage measurement.
  • Yellow (thin): Positive voltage input for measurement (DC 0-100V).
• Thick Two-Wire Cable (Current Shunt):
  • Red (thick): Connect to the load side of the current path.
  • Black (thick): Connect to the power supply side of the current path.

Important: The current measurement circuit (thick wires) must be connected in series with the load. The voltage measurement circuit (yellow and black thin wires) must be connected in parallel with the circuit being measured. Do not connect the thick red wire directly to the power supply positive if the current exceeds the meter's internal shunt capacity (typically 10A models use an internal shunt, 50A/100A models require an external shunt, though this specific model appears to have an integrated shunt for its stated ranges).

5.2 Installation Steps

1. Prepare the Mounting Hole: Refer to the dimensions in Figure 4.1 to cut an appropriate rectangular opening in your panel or enclosure.
2. Insert the Meter: Gently push the meter into the prepared opening until it snaps into place.
3. Connect Power (Thin Wires):
   • Connect the thin red wire to the positive (+) terminal of your DC power supply (4.5-30V).
   • Connect the thin black wire to the negative (-) terminal of your DC power supply. This also serves as the common ground.
4. Connect Voltage Measurement (Thin Yellow Wire):
   • Connect the thin yellow wire to the positive (+) point of the circuit where you want to measure voltage. The thin black wire is already connected to the negative/ground of the circuit.
5. Connect Current Measurement (Thick Wires):
   • Disconnect the main positive (+) power line of the circuit you wish to measure current in.
   • Connect the thick red wire to the positive (+) terminal of the load.
   • Connect the thick black wire to the positive (+) terminal of the power source (where the main positive line was disconnected). This effectively places the meter's internal shunt in series with the load.
6. Verify Connections: Double-check all wiring for correct polarity and secure connections before applying power.

6. Operating Instructions

Once properly installed and wired, operating the DSN-VC288 is straightforward:

1. Apply Power: Turn on the DC power supply connected to the meter's thin red and black wires. The LED display should illuminate.
2. Observe Readings: The upper display will show the measured DC voltage in Volts (V), and the lower display will show the measured DC current in Amperes (A).
3. Interpretation: The readings are real-time. If the current reading is 0.00A, ensure the load is connected and drawing current, and that the thick current wires are correctly installed in series.

7. Maintenance

The WELDRIC DSN-VC288 is designed for low maintenance. Follow these guidelines to ensure its longevity:

• Cleaning: Use a soft, dry cloth to clean the display and casing. Do not use abrasive cleaners or solvents.
• Environment: Operate and store the meter in a dry environment, away from direct sunlight, extreme temperatures, and corrosive gases.
• Inspection: Periodically check the wiring connections for any signs of wear, corrosion, or looseness.
• No User-Serviceable Parts: Do not attempt to open or repair the device. Doing so will void any warranty and may cause damage or injury.

8. Troubleshooting

If you encounter issues with your DSN-VC288, refer to the following troubleshooting steps: