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The UNI-T UT15B PRO is a professional-grade, 6000-count true RMS digital multimeter engineered for electricians, industrial maintenance technicians, and engineers who demand high reliability, precision, and advanced safety features . As part of UNI-T's PRO series, this robust instrument is specifically designed for diagnosing complex electrical systems, including variable frequency drives (VFDs) and industrial control panels.
Engineered with user safety as the absolute priority, the UT15B PRO is certified to the stringent CAT III 1000V and CAT IV 600V safety standards and features full-range 30kVA mis-operation protection . Its rugged design includes a 1-meter drop-proof casing, a built-in flashlight, and an automatic backlight, making it an indispensable tool for troubleshooting in dark or confined industrial environments .
6000-Count True RMS Display: High-resolution backlit LCD with 6000 counts for precise readings. True RMS technology ensures accurate measurement of non-linear or distorted AC waveforms, common with modern electronic loads .
VFC (Variable Frequency Control) Mode: A built-in low-pass filter that blocks high-frequency interference, enabling stable and accurate voltage measurements on variable frequency drives (VFDs), invertors, and other noisy electrical systems .
Wide Measurement Range: Measures DC/AC voltage up to 1000V, DC/AC current up to 10A, resistance up to 60MΩ, and capacitance up to 6000µF (6mF) .
Full-Range Mis-Operation Protection: Engineered to withstand up to 30kVA of fault energy and 8kV transient voltage shocks, providing robust protection against accidental misuse and ensuring user safety .
Auto/Manual Ranging: Offers the convenience of auto-ranging for quick measurements and the control of manual ranging for specific diagnostic tasks .
Comprehensive Testing Functions: Includes diode test, continuity test with acoustic indication, MAX/MIN recording, relative mode, and data hold .
Rugged and User-Friendly Design: Features a 1-meter drop-proof casing, an integrated LED flashlight for working in dark panels, and an auto-backlight LCD that adjusts to ambient light conditions .
High Safety Rating: Certified to CAT III 1000V / CAT IV 600V with cETLus, CE, and UKCA approvals, guaranteeing safety in high-energy environments .
Long Battery Life: Powered by 2 x 1.5V AA batteries, ensuring extended operational time .
The UNI-T UT15B PRO delivers professional-grade accuracy across a comprehensive range of electrical parameters .
| Function | Range(s) | Basic Accuracy |
|---|---|---|
| DC Voltage (V) | 600mV/6V/60V/600V/1000V | ±(0.5% + 3 digits) |
| AC Voltage (V) | 600mV/6V/60V/600V/1000V | ±(1.0% + 3 digits) |
| DC Current (A) | 600μA/6000μA/60mA/600mA/6A/10A | ±(0.8% + 3) to ±(1.2%+5) |
| AC Current (A) | 600μA/6mA/60mA/600mA/6A/10A | ±(1.0%+3) to ±(1.5%+3) |
| Resistance (Ω) | 600Ω/6000Ω/60kΩ/600kΩ/6MΩ/60MΩ | ±(0.5%+2) to ±(2%+5) |
| Capacitance (F) | 6nF to 600μF / 6mF | ±(2.0%+5) to ±10% |
| AC Voltage/Current Frequency Response | 40Hz ~ 500Hz | - |
| Item | Quantity |
|---|---|
| UNI-T UT15B PRO Digital Multimeter | 1x |
| Gold-Plated Test Leads | 1 pair |
| 1.5V AA Batteries | 2x |
| Protective Cloth Bag | 1x |
| User Manual | 1x |
Note: Unlike the UT17B PRO, this model does not include a temperature probe .
This mode activates a low-pass filter, blocking high-frequency noise and carrier signals.
Application: Essential for accurately measuring voltage on variable frequency drives (VFDs), inverters, and motor controls where standard meters often give false or unstable readings .
The UT15B PRO is engineered with advanced input protection circuitry.
Application: Withstands accidental voltage surges up to 8kV and mis-connection of test leads, providing confidence when working on live, high-energy circuits .
Set the rotary switch to the V position.
Press SELECT to choose between DC and AC measurement.
Connect test leads in parallel to the circuit under test.
Input impedance is approximately 10MΩ, minimizing circuit loading .
Set the rotary switch to the appropriate μA, mA, or A position.
Press SELECT to choose between DC and AC current.
Connect test leads in series with the circuit under test.
Set the rotary switch to the capacitance position.
Fully discharge capacitors before testing to avoid damage.
Connect test leads in parallel with the capacitor.
Measures up to 6000μF (6mF) , suitable for many motor start capacitors and power supply filtering .
Set the rotary switch to the **Ω/))) ** position.
For resistance, connect test leads across the component (up to 60MΩ).
For continuity, the buzzer sounds when resistance is low, confirming a complete circuit.
For diode test, connect leads across the diode to measure forward voltage drop.
The meter features an auto-backlight that activates in low-light conditions .
A dedicated LED flashlight button illuminates the work area for safe troubleshooting in dark panels and confined spaces .
Press MAX/MIN to record the highest and lowest readings.
Press REL to set a reference value for comparative measurements (e.g., zeroing test lead resistance).
Press HOLD to freeze the current reading on the display for convenient viewing .
The PRO series offers three models with increasing specialization:
The UNI-T UT15B PRO is an ideal tool for:
Safe high-voltage measurements up to CAT III 1000V.
VFC mode for diagnosing variable frequency drives and motor controls .
Continuity and diode testing for control panels and wiring.
Full-range protection for working on live distribution systems .
Accurately measure distorted waveforms from inverters and drives using the VFC low-pass filter .
Identify issues with IGBT modules and PWM signals that standard meters miss.
General electrical troubleshooting in manufacturing plants.
Capacitance testing for power factor correction and motor start capacitors.
Using the flashlight and auto-backlight for work in dark electrical rooms .
Testing battery voltage and alternator output (12V/24V systems).
Measuring parasitic drain up to 10A.
Sensor testing with frequency response up to 500Hz.
Troubleshooting home electrical systems.
Testing components with 6000-count resolution.
Appliance repair and maintenance.
Users consistently praise the UT15B PRO for its exceptional build quality, advanced safety features, and VFC capability for motor drive work. The full-range mis-operation protection is frequently highlighted as a key differentiator, providing confidence when working on live, high-energy circuits .
Build Quality: "A quick, accurate and robust multimeter" — Verified reseller .
Safety Features: "Due to the mis-operation protection, the meter is protected against damage when the knob is turned in the wrong position" — Verified reseller .
VFC Mode: Enables stable and reliable readings in environments with electrical noise .
Value: Offers professional-grade features at an accessible price point compared to premium brands.
No Temperature Measurement: Unlike the UT17B PRO, this model does not include temperature measurement. For HVAC applications, consider the UT17B PRO .
Limited Capacitance Range: Maximum 6000μF, suitable for many applications but not extremely large capacitors (for higher range, consider the UT89XD or UT139 series).
Weight: At 484g, it's heavier than compact meters, reflecting its industrial build quality .
The UNI-T UT15B PRO is the definitive choice for industrial professionals who need VFC capability for motor drive diagnostics combined with uncompromising safety features. Its VFC mode, full-range 30kVA mis-operation protection, and CAT III 1000V / CAT IV 600V safety rating make it exceptionally well-suited for electricians, maintenance technicians, and engineers working with variable frequency drives, control panels, and high-energy industrial systems .
While it lacks temperature measurement and extended frequency capabilities (available in the UT17B PRO), the UT15B PRO excels where it matters most: safe, accurate, and reliable measurements in demanding industrial environments.
Whether you're an industrial electrician troubleshooting VFDs, a plant maintenance professional diagnosing motor controls, or a technician working on high-voltage distribution systems, the UT15B PRO delivers professional-grade performance with the safety features you can trust.
The UNI-T UT15B PRO: Industrial-grade precision with advanced VFC technology and uncompromising safety.
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