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Overview
A mini 3-wire voltmeter measures a DC (Direct Current) voltage ranging from 0 to 30V DC and has a 0.36 inch LED display. The 3-wire configuration has a red, black and white (or yellow) wires. It is a commonly used configuration for measuring electrical potential difference across two points in a circuit which gives better accuracy compared to 2-wire configuration.
This additional wire enables the meter to compensate for voltage drops across the connecting wires, resulting in more precise readings.
Specification
| Model | DSN-DVM-368L-3 |
|---|---|
| Measuring Range | 0 - 30V DC |
| Power Supply | Red: 4.5 - 30V DC Green: 4.7 - 30V DC Blue: 5.0 - 30V DC |
| Tolerance | ±1% |
| Input Impedance | >100K |
| Current | Red: < 23mA Green: < 18mA Blue: < 13mA |
| Refresh Rate | 300 milliseconds |
| Display | 3 Digit, 0.36 inch LED |
| Display Color | Red, Green or Blue |
| Wire Length | 15cm |
| Dimensions | 23mm x 15mm x 10mm |
| Mounting Holes | 2x 2.8mm |
Connection & Pinout
Connection and pinout for 3-wire voltmeter
| Red Wire | Positive Terminal Connects to the positive terminal of the power supply. |
|---|---|
| Black Wire | Negative Terminal Connects to the negative terminal of the power supply. |
| White / Yellow Wire | Common or Sense Terminal The third wire, which allows the voltmeter to measure the actual voltage at the point of interest in the circuit, bypassing any voltage drop across the wires due to resistance. |
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