UT225B - Measurement Uni-T - Free user manual and instructions
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| Product Type | Digital Clamp Meter |
| Brand | Uni-T |
| Model | UT225B |
| Display | 4000-count LCD with backlight |
| AC Current Range | 0.01A – 400A |
| DC Current Range | 0.01A – 400A |
| AC Voltage Range | 0.1V – 600V |
| DC Voltage Range | 0.1V – 600V |
| Resistance Range | 0.1Ω – 40MΩ |
| Capacitance Range | 0.01nF – 100μF |
| Frequency Range | 10Hz – 10kHz |
| True RMS | Yes |
| Jaw Opening | 30mm |
| Safety Rating | CAT II 600V |
| Power Supply | 2 x 1.5V AAA batteries |
| Dimensions | 220 × 72 × 35 mm |
| Weight | Approximately 220 g |
| Auto Power Off | After 15 minutes of inactivity |
| Data Hold | Yes |
| Overrange Indication | OL displayed |
| Low Battery Indication | Yes |
| Operating Temperature | 0°C to 40°C |
| Storage Temperature | -10°C to 50°C |
| Included Accessories | Test leads, carrying bag, batteries, user manual |
| Cleaning and Maintenance | Wipe with a dry, lint-free cloth. Do not use solvents. |
Frequently Asked Questions - UT225B Uni-T
How do I measure AC current with the Uni-T UT225B?
Rotate the function switch to the AC current (A~) position. Press the trigger to open the clamp and enclose a single conductor. Read the value on the LCD. For best accuracy, center the conductor in the clamp jaws.
How do I measure DC voltage?
Set the rotary switch to DC voltage (V⎓). Connect the black test lead to the COM jack and the red lead to the V/Ω jack. Touch the probes to the circuit in parallel and read the measurement.
What does "OL" mean on the display?
"OL" (overload) indicates the measured value exceeds the selected range. Switch to a higher range if available, or ensure the meter is set to the correct function and range.
How do I replace the batteries in the UT225B?
Turn off the meter and remove the test leads. Use a screwdriver to remove the battery cover screw on the back, open the cover, and replace the 2 AAA batteries observing polarity. Close and reattach the cover securely.
Is the Uni-T UT225B true RMS capable?
Yes, the UT225B is a True RMS clamp meter, allowing accurate measurements of non-sinusoidal AC signals. This is essential when measuring distorted waveforms common in modern power systems.
How can I use the data hold function?
Press the HOLD button to freeze the current reading on the display. Press it again to release. This is useful when taking measurements in awkward positions where the display is not readable.
What safety precautions should I follow when using the clamp meter?
Always observe CAT II 600V safety ratings. Do not exceed the maximum input limits. Inspect test leads for damage before use. Never use the meter if the casing is damaged. Do not measure current on circuits above the rated voltage or current. Use appropriate personal protective equipment.
Why does the meter read zero when measuring current?
Ensure the conductor is fully enclosed by the clamp jaws and not near the jaw opening. Also, check that the function is set to current and the range is appropriate. For AC current, ensure the conductor is not shielded by the clamp gap.
How to maintain the UT225B?
Keep the meter clean and dry. Wipe the exterior with a soft dry cloth, avoiding solvents or abrasive cleaners. Do not immerse in water. Calibrate periodically according to the manufacturer's recommendations to ensure accuracy.
Can the UT225B measure capacitance?
Yes, it includes a capacitance measurement function. To measure, set the dial to the capacitance position, insert the capacitor into the dedicated input jacks (if provided) or use the test leads, and read the value.
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USER MANUAL UT225B Uni-T
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Product information
Brand : Uni-T
Model : UT225B
Category : Measurement