1. Introduction
The Kawish NC008 VI Curve Tester is a versatile diagnostic tool designed for testing electronic circuit boards. It allows for the visualization of voltage-current (VI) characteristics of components, aiding in fault detection and analysis. This device supports both dual-channel alternating and simultaneous display modes, offers adjustable internal resistance, and operates across multiple test frequencies. It is compatible with both analog and digital oscilloscopes, making it a valuable addition to any electronics workbench.
2. Safety Warnings
- Use only intact tools; do not use cracked, deformed, or damaged tools.
- Wear appropriate personal protective equipment, such as safety goggles, during operation.
- Use the device for its intended purpose only; do not misuse or overload it.
- Operate the device in clean, dry, well-lit, and non-flammable areas.
- Keep the device away from children and untrained users.
- WARNING: Do not measure with power applied to the circuit under test. Ensure the circuit is completely de-energized before connecting the VI Curve Tester.
3. Package Contents
Please check the package for the following items:
- VI Curve Tester Unit (Model NC008)
- Power Adapter
- BNC Cables (2 pieces)
- Test Leads (1 set, red and black)
4. Product Overview
The VI Curve Tester features a user-friendly interface with clearly labeled controls and connection points.
4.1 Front Panel Controls
- Internal Resistance Buttons (LOW, MED1, MED2, HIGH): These buttons adjust the internal resistance of the test signal, allowing for different sensitivity levels when analyzing components.
- Frequency Adjustment Knobs: These knobs (or buttons on some models) allow selection of various test frequencies (e.g., 60Hz, 400Hz, 2000Hz, SCAN on Professional Edition).
- Display Mode Switch (A/B): Toggles between alternating and simultaneous display modes for dual-channel operation.
- Test Terminals (A, COM, B, G): These are the connection points for the test leads. 'A' and 'B' are for the two test channels, 'COM' is the common ground, and 'G' is for ground reference.
4.2 Rear/Side Panel
- Power Input: Connects to the provided power adapter.
- BNC Outputs: Connects to the input channels of an oscilloscope using BNC cables.
5. Setup
- Power Connection: Connect the provided power adapter to the power input jack on the VI Curve Tester and then plug it into a suitable power outlet.
- Oscilloscope Connection: Use the two BNC cables to connect the BNC outputs of the VI Curve Tester to the input channels (e.g., Channel 1 and Channel 2) of your oscilloscope.
- Test Lead Connection: Connect the red and black test leads to the 'A', 'COM', 'B', and 'G' terminals on the front panel as required for your test setup. Typically, 'COM' is for the common ground, 'A' and 'B' for the test points, and 'G' for an additional ground reference.
6. Operating Instructions
Before operating, ensure the device is properly set up and all safety warnings are observed.
- Prepare the Circuit: Ensure the circuit board or component you intend to test is completely de-energized and disconnected from any power source.
- Connect Test Leads: Connect the test leads from the VI Curve Tester to the specific points on the circuit board or component you wish to analyze.
- Select Internal Resistance: Choose an appropriate internal resistance setting (LOW, MED1, MED2, HIGH) based on the component's characteristics. Lower resistance is suitable for low-impedance components, while higher resistance is for high-impedance components.
- Select Test Frequency: Adjust the test frequency (e.g., 60Hz, 400Hz, 2000Hz, or SCAN) to best suit the component under test. Different frequencies can reveal different characteristics.
- Choose Display Mode: Use the A/B switch to select your preferred display mode:
- Dual Channel Alternating Display: Displays the VI curve for channel A, then switches to channel B. Useful for comparing two components sequentially.
- Dual Channel Simultaneous Display: Displays both channel A and channel B VI curves concurrently on the oscilloscope. Ideal for direct comparison of two components or two points on a circuit.
- Professional Version Voltage Adjustment: If using the Professional Edition, select the desired voltage level (0.6V, 4V, 8V, 16V) to match the component's operating voltage or to observe its behavior under different voltage stresses.
- Observe Waveforms: Observe the VI curves on your oscilloscope. Analyze the shape, size, and position of the curves to identify faults or characterize components.
- Handle Gently: Handle the device and its connections smoothly and gently; avoid sudden impacts.
7. Maintenance & Storage
- Cleaning: Wipe the device clean and dry after each use. Ensure all connectors and terminals are free of dirt, dust, and oil.
- Storage: Store the VI Curve Tester in a dry, ventilated area, preferably in a toolbox, away from moisture, corrosion, and extreme temperatures.
- Inspection: Regularly inspect cables and connections for wear or damage. Replace worn or damaged cables or components promptly to ensure accurate and safe operation.
8. Troubleshooting
- No Display on Oscilloscope:
- Check if the VI Curve Tester is powered on.
- Verify that the BNC cables are securely connected between the tester and the oscilloscope.
- Ensure the oscilloscope is set to the correct input channels and display mode (e.g., XY mode for VI curves).
- Check the oscilloscope's vertical and horizontal scale settings.
- Incorrect or Distorted Waveforms:
- Confirm the circuit under test is completely de-energized.
- Check for loose or faulty test lead connections.
- Adjust the internal resistance and test frequency settings on the VI Curve Tester.
- Ensure the oscilloscope's settings (e.g., coupling, bandwidth) are appropriate for the signal.
- Device Not Powering On:
- Verify the power adapter is correctly plugged into both the device and the wall outlet.
- Check the power outlet for functionality.
9. Specifications
| Feature | Specification |
|---|---|
| Brand Name | Kawish |
| Model Name | NC008 |
| Item Type | Mechanical Testers (VI Curve Tester) |
| Feature | VI Curve Tester |
| Material | Metal and Plastic |
| Voltage | 220V (Input for power adapter) |
| Power (W) | 100W |
| Item Length | 20cm |
| Item Width | 18cm |
| Item Height | 16cm |
| Item Weight | 5kg |
| External Testing Certification | CCC |
| Is Batteries Included | No |
| Use | Not Telecommunication |
| Electronic | No |
| High-concerned chemical | None |
| Origin | Mainland China |
| Package Length | 22 cm |
| Package Width | 26 cm |
| Package Height | 22 cm |
| Package Weight | 0.4 kg |
10. User Tips
- Oscilloscope Compatibility: The VI Curve Tester is designed to be compatible with a wide range of oscilloscopes, including models like the Fluke 190. Ensure your oscilloscope is set to XY mode for proper VI curve display.
- Component Comparison: Utilize the dual-channel simultaneous display mode to directly compare the VI characteristics of a known good component with a suspect component. This can quickly highlight discrepancies.
- Voltage and Frequency Selection: Experiment with different voltage and frequency settings to thoroughly test components. Some faults may only become apparent under specific test conditions.
- Documentation: Keep a record of typical VI curves for common components to use as a reference for future troubleshooting.
11. Warranty & Support
For any quality issues or technical support, please contact your supplier with proof of purchase. Do not attempt to modify or repair the tool without authorization, as this may void your warranty and could lead to further damage or injury.
A comprehensive user manual in PDF format is available for download. Please refer to it for detailed instructions, advanced usage, and specific warranty terms: User Manual (PDF)
