Digital AC panel voltmeter — precise readings, hassle-free installation
Need to monitor voltage in your electrical distribution board without the clutter of extra power cables? This digital AC panel voltmeter is designed specifically for that purpose. It draws power directly from the line being measured, provides clear readings on a bright blue LED display, and is equally effective in both single-phase and three-phase systems.
Note: This model measures AC voltage exclusively. In three-phase systems, it connects between two phases (line voltage). In single-phase systems, it connects between phase and neutral.
Why choose this model? (Key benefits):
- No external power supply required — it powers itself directly from the measured voltage, eliminating the need for extra wiring in your board.
- ±1% Accuracy — with an error margin of less than 2–4V at 230V, it is highly reliable for continuous monitoring in professional applications.
- Single and three-phase compatible — the same device measures 230V phase-to-neutral or 380–400V phase-to-phase without any modifications.
- 0.56-inch blue LED display — large, high-contrast digits that are easy to read from a distance or in poorly lit electrical cabinets.
- Fine-tuning via trimmer — if the displayed value deviates, you can calibrate it in seconds using a precision screwdriver.
- Reverse polarity protection — accidental miswiring will not damage the unit.
Details and Performance
The input impedance of over 1 MΩ ensures the voltmeter draws virtually no current from the measured circuit, meaning it won’t interfere with your installation. The included 20 cm leads are perfect for standard distribution board setups, and the compact 4.8 x 2.9 x 2.2 cm housing fits into any standard panel cutout. It operates reliably between -20°C and +65°C, making it suitable for outdoor enclosures or industrial environments with significant temperature fluctuations.
| Parameter | Value / Detail |
|---|---|
| Measurement Type | Alternating Current (AC) |
| System Compatibility | Single-phase and Three-phase |
| Power Supply | Self-powered via measured voltage (no external supply) |
| Accuracy | ±1% |
| Input Impedance | > 1 MΩ |
| Display | Blue LED, 0.56-inch digits (14.22 mm) |
| Lead Length | 20 cm (red + / black -) |
| Calibration | Integrated trimmer potentiometer |
| Protection | Reverse polarity protection |
| Product Dimensions | 4.8 x 2.9 x 2.2 cm |
| Mounting Cutout | 4.6 x 2.7 cm |
| Net Weight | 18 g |
| Operating Temperature | -20°C … +65°C |
Installation and Usage Instructions
- Isolate the circuit power supply before performing any work.
- Cut the mounting hole in your panel: 4.6 x 2.7 cm.
- Insert the voltmeter and secure it using the side clips.
- Connect the red (+) and black (-) wires to the measurement points: phase–neutral (single-phase) or phase–phase (three-phase).
- Restore power and read the voltage directly on the LED display.
- If the reading differs from a reference meter, adjust the trimmer potentiometer on the back with a fine screwdriver until they match.
- Ensure all connections are properly insulated before final use.
Package Contents
- 1 x Digital AC panel voltmeter with blue LED display
- Integrated connection leads (20 cm, red and black)
Frequently Asked Questions
Can it measure Direct Current (DC)?
No. This model is designed exclusively for AC voltage. For DC applications, you will need a dedicated DC model.
Does it require a separate power supply?
No. It is powered directly by the voltage it measures, saving you from extra wiring compared to other panel voltmeters.
How do I connect it in a three-phase system?
Connect the red and black wires between any two phases. You will read the line voltage — typically 380–400V AC.
What happens if I accidentally reverse the wires?
Internal reverse polarity protection prevents damage to the unit. However, always observe polarity markings for correct operation.
How do I calibrate it if the reading is inaccurate?
Use a precision screwdriver to adjust the trimmer potentiometer on the back until the displayed value matches that of a calibrated reference meter.
Will it fit in standard electrical boards?
Yes. The required 4.6 x 2.7 cm cutout is compatible with the vast majority of electrical distribution boards and control panels.
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