1. Introduction
The uxcell 91C4 DC 0-10V Analog Panel Voltage Gauge is designed for measuring direct current (DC) voltage within a range of 0 to 10 volts. This instruction manual provides essential information for the safe installation, operation, and maintenance of the device. Please read this manual thoroughly before use.
2. Safety Information
Always observe the following safety precautions to prevent personal injury or damage to the meter and other equipment:
- Ensure the power supply to the circuit being measured is disconnected before installation or wiring.
- Verify that the voltage to be measured does not exceed the meter's specified range (DC 0-10V).
- Connect the meter correctly according to the wiring diagram. Incorrect polarity can damage the meter.
- Do not use the meter in environments with excessive moisture, dust, or corrosive gases.
- This meter is designed for DC voltage measurement only. Do not connect to AC circuits.
- Only qualified personnel should perform installation and maintenance.
3. Product Overview
The uxcell 91C4 is a compact analog panel voltmeter featuring a clear scale and a moving coil mechanism. It is designed for flush panel mounting.

Figure 1: Front view of the uxcell 91C4 DC 0-10V Analog Panel Voltmeter. This image displays the meter's face with its scale from 0 to 10 volts, the 'V' unit, the model number '91C4', and the accuracy class '2.5A'. The needle is positioned at zero, indicating no voltage input.

Figure 2: Front and side view of the uxcell 91C4 DC 0-10V Analog Panel Voltmeter with key dimensions. The image shows the meter's width and height as 45mm (1.77 inches) and its depth as 36mm (1.42 inches), providing essential information for panel cutout and mounting.
4. Specifications
| Model | 91C4 |
| Measurement Range | DC 0-10V |
| Accuracy Class | 2.5 (Error Margin: ± 2.5%) |
| Graduation | 0.4V |
| Dimensions (L×W×T) | 45mm × 45mm × 36mm (1.77in × 1.77in × 1.42in) |
| Net Weight | 33g (1.16 oz) |
| Casing Material | High-grade ABS Plastic |
| Shunt Resistor | Not Required |
| Mounting Type | Panel Mount |
5. Setup and Installation
Follow these steps for proper installation of the voltage gauge:
- Prepare Panel Cutout: Create a square cutout in your panel with dimensions appropriate for the meter (approximately 45mm x 45mm). Ensure the cutout is clean and free of burrs.
- Insert Meter: Carefully insert the meter into the prepared panel cutout from the front.
- Secure Meter: From the rear of the panel, use the provided bolts and screws to secure the meter in place. Tighten them evenly to prevent damage to the meter casing.
- Wiring:
- Identify the positive (+) and negative (-) terminals on the back of the meter.
- Connect the positive lead from the DC circuit to be measured to the meter's positive (+) terminal.
- Connect the negative lead from the DC circuit to be measured to the meter's negative (-) terminal.
- Ensure all connections are secure and insulated to prevent short circuits.
- Verify Connections: Double-check all wiring before applying power to the circuit.

Figure 3: Rear view of the uxcell 91C4 DC 0-10V Analog Panel Voltmeter, illustrating the terminal posts and the included mounting hardware. This hardware, consisting of nuts, washers, and screws, is used to secure the meter firmly to a panel.
6. Operating Instructions
Once installed and wired correctly, operating the uxcell 91C4 voltage gauge is straightforward:
- Apply Power: Turn on the power supply to the DC circuit being monitored.
- Read Measurement: The meter's needle will move across the scale to indicate the current DC voltage. Read the value directly from the scale.
- Observe Range: Ensure the needle remains within the 0-10V range. Continuous operation above the maximum rated voltage may damage the meter.

Figure 4: Close-up view of the meter's face, emphasizing the clear voltage scale, the red needle, and the model markings. This detailed view assists users in accurately reading the measured voltage.
7. Maintenance
The uxcell 91C4 voltage gauge requires minimal maintenance:
- Cleaning: Wipe the meter's front panel with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Inspection: Periodically check the wiring connections for tightness and signs of corrosion.
- Environment: Ensure the operating environment remains within suitable conditions (e.g., avoid extreme temperatures or humidity).
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Meter needle does not move. | No power to the circuit; incorrect wiring; meter malfunction. | Verify power supply; check wiring for correct polarity and secure connections; if issues persist, meter may be faulty. |
| Meter needle shows incorrect reading. | Incorrect wiring; meter calibration issue; external interference. | Recheck wiring; ensure the measured voltage is within the meter's range; if possible, compare with a known accurate voltmeter. |
| Meter needle is stuck or erratic. | Physical damage; internal component failure. | Inspect for visible damage; if internal, meter may need replacement. |
If troubleshooting steps do not resolve the issue, contact uxcell customer support.
9. Warranty and Support
For warranty information and technical support, please refer to the uxcell official website or contact their customer service department. Keep your purchase receipt for warranty claims.
Contact Information:
- Visit the uxcell Store on Amazon for product information and support.
- Refer to your product packaging or uxcell's official website for specific warranty terms and contact details.
