UT255C - Measurement Uni-T - Free user manual and instructions
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| Product Type | Digital Clamp Meter |
| Brand | Uni-T |
| Model | UT255C |
| Measurement Functions | AC/DC Current, AC/DC Voltage, Resistance, Frequency, Capacitance, Temperature |
| AC Current Range | 0.1 A to 1000 A |
| DC Current Range | 0.1 A to 1000 A |
| AC Voltage Range | 1 V to 750 V |
| DC Voltage Range | 0.1 V to 1000 V |
| Resistance Range | 0.1 Ω to 40 MΩ |
| Display | 3-3/4 digit LCD with backlight (3999 counts) |
| True RMS | Yes |
| Safety Rating | CAT III 1000 V, CAT IV 600 V |
| Power Supply | 9 V battery (6F22) |
| Dimensions | 260 x 97 x 44 mm (approx.) |
| Weight | 380 g (approx.) |
| Auto Power Off | Yes |
| Maintenance and Cleaning | Wipe with a dry cloth; do not use solvents or abrasives |
| Safety Precautions | Use proper PPE; obey category ratings; disconnect from test points when changing modes |
| Spare Parts and Repairability | No user-serviceable parts; contact certified technician for service |
| General Information | Annual calibration recommended for accurate readings |
Frequently Asked Questions - UT255C Uni-T
How do I measure AC current with the UT255C?
Set the rotary switch to the AC A position, press the trigger to open the clamp, and clamp around a single conductor. The measured value appears on the display. For best results, ensure the conductor is centered in the clamp.
What does True RMS mean?
True RMS is an accurate measurement for non-sinusoidal waveforms. It allows the UT255C to read true effective voltage and current, even in distorted signals common in modern electrical systems.
Can the UT255C measure DC current?
Yes, the UT255C measures DC current. Select the DC A range and use the same clamping procedure. The display shows the polarity relative to the clamp alignment.
How do I replace the battery?
Turn off the meter, remove the screw from the battery cover, and replace the 9V battery with a new one. Observe polarity and ensure the cover is secured before restarting.
What is the safety rating of this clamp meter?
The UT255C is rated CAT III 1000V and CAT IV 600V, designed for distribution circuits and primary supply levels. Always follow safety guidelines.
Why does the display show 'OL'?
OL means overload; the reading exceeds the selected range. Switch to a higher range or disconnect the input to avoid damage.
How do I use the data hold function?
Press the HOLD button to freeze the current reading on the display. Press it again to resume live measurements. This is useful for recording readings in awkward positions.
What should I do if the meter does not power on?
First, check the battery and replace if needed. If the problem persists, open the fuse compartment and inspect the fuses. Contact a qualified technician if the issue continues.
Can I measure temperature with this device?
Yes, the UT255C supports temperature measurement with a type-K thermocouple. Connect the thermocouple to the V/Ω jack and select the °C/°F mode.
How should I maintain the clamp meter?
Clean the housing with a dry, lint-free cloth. Do not use solvents. Calibrate the meter annually to ensure measurement accuracy.
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USER MANUAL UT255C Uni-T
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Product information
Brand : Uni-T
Model : UT255C
Category : Measurement