1. Introduction
The OWON CP024 is an AC/DC Current Clamp Probe designed for use with digital storage oscilloscopes. It allows for non-invasive measurement of current in electrical circuits, providing a safe and convenient way to analyze current waveforms. This manual provides instructions for the proper setup, operation, and maintenance of the CP024.
2. Features
- Wide Test Range: 4A to 400A (AC/DC)
- Bandwidth: DC 200KHz (-3dB)
- Jaw Size: 23mm maximum opening
- Three-Gear Switch: Selectable ranges for 4A, 40A, and 400A.
- Auto Zero at power on for accurate DC measurements.
- Low battery indication for timely battery replacement.
- Standard insulated BNC interface for broad compatibility with oscilloscopes.
- Error by earth magnetic: ± 30mA max
- Remanence (±100A/10A): ± 30mA max
3. Package Contents
Verify that all items listed below are included in your package. If any items are missing or damaged, please contact your vendor.
- 1 x OWON CP024 AC/DC Current Clamp Probe
- 1 x 9V (6LR61) Battery (optional, may be included depending on region/seller)
- 1 x Quick Guide
- 1 x Soft Bag
- Packaging
4. Setup
4.1 Battery Installation
- Locate the battery compartment on the back of the CP024 unit.
- Open the battery compartment cover.
- Insert a 9V (6LR61) battery, ensuring correct polarity.
- Close the battery compartment cover securely.
4.2 Connecting to an Oscilloscope
- Ensure your oscilloscope is powered off.
- Connect the BNC connector of the CP024 probe cable to an input channel on your digital storage oscilloscope.
- Power on your oscilloscope.
- Adjust the oscilloscope's input settings (e.g., vertical scale) according to the probe's sensitivity (e.g., 1mV/10mA, 1mV/0.1A, 1mV/1A).
5. Operating Instructions
5.1 Powering On and Range Selection
- Slide the power switch to the desired current range (4A, 40A, or 400A). The "POWER" indicator should light up.
- The CP024 features an "Auto Zero" function upon power-on, especially important for DC current measurements.
5.2 Zero Adjustment (for DC measurements)
For accurate DC current measurements, ensure the probe is properly zeroed:
- With the probe powered on and no current flowing through the jaw, press the "ZERO" button.
- Observe the oscilloscope display; the baseline should be at zero volts.
5.3 Taking Measurements
- Open the clamp jaw by pressing the lever.
- Carefully place the conductor carrying the current to be measured within the jaw. Ensure the jaw closes completely around a single conductor.
- Release the lever to close the jaw.
- Observe the current waveform on the connected oscilloscope.
- Use the oscilloscope's vertical scale and offset controls to properly display and measure the current. Remember to account for the probe's sensitivity (e.g., if the oscilloscope reads 100mV on the 40A range, the current is 100mV / (1mV/0.1A) = 10A).
6. Maintenance
6.1 Battery Replacement
When the "LOW BATTERY" indicator illuminates, replace the 9V battery as soon as possible to ensure accurate measurements. Refer to section 4.1 for battery installation steps.
6.2 Cleaning
Wipe the unit with a soft, dry cloth. Do not use abrasive cleaners or solvents. Ensure the unit is powered off before cleaning.
6.3 Storage
Store the CP024 in its soft bag in a cool, dry place away from direct sunlight and extreme temperatures. If storing for extended periods, remove the battery to prevent leakage.
7. Troubleshooting
- No Power / Unit Not Turning On: Check if the 9V battery is installed correctly and has sufficient charge. Replace the battery if necessary.
- Inaccurate DC Readings: Ensure the probe is properly zeroed by pressing the "ZERO" button before measurement, with no current flowing through the jaw.
- No Signal on Oscilloscope:
- Verify the BNC cable is securely connected to both the CP024 and the oscilloscope.
- Check the oscilloscope's input channel settings (e.g., input coupling, vertical scale).
- Ensure the clamp jaw is fully closed around a single conductor.
- Confirm the CP024 is powered on and the correct range is selected.
- "LOW BATTERY" Indicator On: Replace the 9V battery immediately.
8. Specifications
DC Current Measurement
| Range | Sensitivity | Accuracy |
|---|---|---|
| DC 4A | 1 mV/10 mA | ±(1.5%rdg±5d) |
| DC 40A | 1 mV/ 0.1A | ±(1.5%rdg±5d) |
| DC 300A | 1 mV/ 1A | ±(1.5%rdg±5d) |
| DC 300~400A | 1 mV/ 1A | ±(3.0%rdg±5d) |
AC Current Measurement
| Range | Sensitivity | Accuracy |
|---|---|---|
| AC 4A | 1 mV/ 10mA | ±(2.0%rdg±5d) |
| AC 40A | 1 mV/ 0.1A | ±(2.0%rdg±5d) |
| AC 300A | 1 mV/ 1A | ±(2.0%rdg±5d) |
| AC 300A~400A | 1 mV/ 1A | ±(3.0%rdg±5d) |
General Specifications
| Power supply | 9V (6LR61) Battery |
| Dimension (W*H*D) | 180 x 68 x 32 (mm) |
| Device Weight | About 250 g |
| Operating Temperature | 0℃ to 50℃, ≤70%RH |
Specifications subject to change without prior notice.
9. User Tips
- For optimal accuracy, especially with low current measurements, ensure the probe is zeroed correctly before each DC measurement.
- Always select the appropriate current range to get the best resolution on your oscilloscope. Start with a higher range if unsure, then decrease as needed.
- When measuring AC current, ensure the frequency is within the probe's bandwidth (DC 200KHz) for accurate waveform representation.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your original point of purchase or the manufacturer directly. Keep your purchase receipt as proof of purchase.
