1. Product Overview
The ANCEL PB50 is a versatile 12V/24V automotive circuit tester designed for comprehensive electrical diagnostics. It combines multiple testing functions into a single, ergonomic device, allowing users to efficiently diagnose and troubleshoot vehicle electrical systems.

This tool functions as a test light, capable of sending voltage and ground signals to power circuits or provide a known good ground. This eliminates the need for separate alligator clips and jumper wires, streamlining the testing process for various components and circuits.

2. Package Contents
Upon opening the package, ensure all items are present and in good condition:
- ANCEL PB50 Circuit Probe Tester Unit
- Probe Tip
- Battery Clamp Cable (13ft / approx. 4 meters)
- User Manual
3. Setup Instructions
Follow these steps to prepare your ANCEL PB50 for use:
- Install the Probe Tip: Insert the probe tip firmly into the round hole on the top of the detector. Ensure it is securely seated to prevent incorrect readings or disconnections.
- Connect to Vehicle Battery: Connect the red battery clamp to the positive (+) terminal of the vehicle's 12V or 24V battery. Connect the black battery clamp to the negative (-) terminal or a suitable chassis ground point.
- Power On: The device will power on automatically once connected to the vehicle's power source.

4. Operating Instructions
The ANCEL PB50 offers four primary diagnostic modes, accessible via the Mode Button. Cycle through the modes to select the desired test.

4.1. DC Voltage Test
In this mode, contact the probe tip to a DC circuit. The LCD will display the DC voltage with a resolution of 0.1 volt. This is useful for checking power supply to components or voltage drops.

4.2. AC Voltage Test
When the tool is in AC Voltage mode, contact the probe tip to an AC circuit. The LCD will display the maximum voltage, minimum voltage, and frequency of the AC signal. This is useful for testing sensors that output AC signals.
4.3. Resistance Test
In Resistance mode, contact the probe tip to a circuit. The LCD will display the resistance value between the probe tip and the auxiliary ground lead. This helps in checking the continuity and resistance of wires and components.

4.4. Diode Test
In Diode mode, contact the probe tip to the positive terminal of a diode and connect the auxiliary ground lead to the negative terminal. The screen will display the forward voltage drop, indicating forward bias. If the connections are reversed, the screen will not display voltage, indicating reverse bias.

4.5. Other Functions
- Power Injection: The PB50 can inject power into a circuit to activate components.
- Ground Testing: Use the tool to test for good ground connections.
- Polarity Checking: Quickly determine the positive, negative, or open status of a circuit.
- Continuity Testing: Test the continuity of power switches, relays, and diodes.
- Component Activation: Energize electrical components like cooling fans or relays directly.
- Built-in LED Flashlight: The integrated LED flashlight illuminates dark work areas, improving visibility.

5. Maintenance
- Cleaning: Wipe the device with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Storage: Store the PB50 in a dry, cool place, away from direct sunlight and extreme temperatures.
- Probe Tip Care: Ensure the probe tip is clean and free from debris before and after each use to maintain accurate readings.
6. Troubleshooting
- No Power: Ensure the battery clamps are securely connected to the vehicle's 12V/24V battery terminals. Check for corrosion on battery terminals.
- Incorrect Readings: Verify the probe tip is properly installed and making good contact with the circuit. Ensure the auxiliary ground lead is connected to a reliable ground point.
- Short Circuits: The PB50 can help locate short circuits without blowing fuses. Follow the circuit path, using the tool to identify where the short occurs.
- Bad Ground Contacts: Use the ground testing function to verify the integrity of ground connections. A poor ground can lead to various electrical issues.
- Overload Protection: The tool is designed with overload protection. If an overload occurs, disconnect the tool and allow it to cool before resuming use.


7. Specifications
| Feature | Description |
|---|---|
| Operating Voltage | 12V / 24V DC |
| Cable Length | 13 feet (approx. 4 meters) |
| Display | 1.7 inch LCD Screen |
| Functions | DC Voltage, AC Voltage, Resistance, Diode, Power Injection, Ground Testing, Polarity Checking, Continuity Testing, Component Activation |
| Additional Features | Built-in LED Flashlight, Ergonomic Design |
| Certifications | RoHS, FC, CE Compliant |
| Package Dimensions | Length: 26 cm, Width: 22 cm, Height: 7 cm |
| Package Weight | 1.2 kg |
8. Warranty and Support
The ANCEL PB50 comes with a 12-month warranty from the date of purchase. For any technical assistance or support, please contact ANCEL customer service. Lifetime technical support is provided for this product.

The product complies with international certification standards, including RoHS, FC, and CE.

9. User Tips
- Ergonomic Design: The PB50 features a curved ergonomic design for a comfortable and secure grip during extended use.
- Clear Display: The 1.7-inch LCD screen provides clear readings, and the bolder font ensures better visibility, especially in challenging lighting conditions.
- Detecting Bad Grounds: Yes, the PB50 can effectively detect bad ground connections in your vehicle's electrical system, which is a common cause of various electrical faults.
- Cable Length: The included cable is approximately 13 feet (4 meters) long, providing ample reach for testing various points around the vehicle.
