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The UNI-T UT61D+ is a professional-grade, 6000-count true RMS digital multimeter representing the next generation of the popular UT61 series . Designed for HVAC technicians, electricians, electronics engineers, and serious enthusiasts, this meter combines high-precision measurement capabilities with enhanced features specifically tailored for temperature-critical applications .
As the most HVAC-focused model in the UT61+ lineup, the UT61D+ distinguishes itself by including a K-type temperature probe as a standard accessory and offering an extended 40Hz-1kHz frequency response for more accurate measurements on variable frequency drives and motor controls . Built with a rugged, impact-resistant casing and certified to CAT III 1000V / CAT IV 600V safety standards, it is engineered to withstand the rigors of daily professional use while providing reliable measurements across a comprehensive range of electrical parameters .
6000-Count True RMS Display: High-resolution backlit LCD with 31-segment analog bar graph for precise readings and trend observation .
Extended Frequency Response: 40Hz to 1kHz bandwidth for accurate AC voltage and current measurements on variable frequency drives and motor controls—significantly wider than the UT61B+ model .
Temperature Measurement Included: Comes standard with a K-type thermocouple probe for readings from -40°C to 1000°C (-40°F to 1832°F), making it ideal for HVAC diagnostics .
Wide Measurement Range: Measures DC/AC voltage up to 1000V, DC/AC current up to 20A, resistance up to 60MΩ, and capacitance up to 60mF .
LoZ (Low Impedance) Mode: Eliminates ghost voltages for accurate AC voltage measurements, a feature not available on the UT61B+ model .
Peak Hold Function: Captures and displays peak voltage/current values for analyzing transient signals .
Comprehensive Functionality: Includes frequency measurement up to 10MHz, duty cycle (0.1%-99.9%), diode test, continuity test (<50Ω buzzer), and NCV (non-contact voltage) detection .
USB PC Connectivity: Built-in USB interface allows connection to a computer for data logging and analysis (cable included) .
Advanced Safety Features: Full-range overload protection with audible and visible alarms for high voltage/current and temperature warnings .
User-Friendly Interface: Auto/manual ranging, data hold, MAX/MIN recording, relative (REL) mode, and auto power off .
High Safety Rating: Certified to CAT III 1000V / CAT IV 600V safety standards .
The UNI-T UT61D+ delivers professional-grade accuracy across an extensive range of electrical and environmental parameters .
| Function | Range(s) | Basic Accuracy |
|---|---|---|
| DC Voltage (V) | 60mV/600mV/6V/60V/600V/1000V | ±(0.5% + 3 digits) |
| AC Voltage (V) | 60mV/600mV/6V/60V/600V/1000V | ±(1.0% + 3 digits) |
| AC Voltage (LoZ) | 600V/1000V | ±(2.0% + 5 digits) |
| DC Current (A) | 600μA/6000μA/60mA/600mA/6A/20A | ±(1.0% + 2 digits) |
| AC Current (A) | 600μA/6000μA/60mA/600mA/6A/20A | ±(1.2% + 5 digits) |
| Resistance (Ω) | 600Ω/6kΩ/60kΩ/600kΩ/6MΩ/60MΩ | ±(1.0% + 2 digits) |
| Capacitance (F) | 60nF/600nF/6μF/60μF/600μF/6mF/60mF | ±(3.0% + 5 digits) |
| Frequency (Hz) | 10Hz ~ 10MHz | ±(0.1% + 4 digits) |
| Duty Cycle | 0.1% ~ 99.9% | ±(2.0% + 5 digits) |
| Temperature (°C) | -40°C ~ 1000°C | ±(1.0% + 3 digits) |
| Temperature (°F) | -40°F ~ 1832°F | ±(1.0% + 6 digits) |
The UT61+ series offers three distinct models, with the UT61D+ positioned as the HVAC-focused mid-range option :
Set the rotary switch to the °C or °F position .
Connect the included K-type thermocouple to the meter, observing correct polarity .
Place the probe on the object to measure temperature from -40°C to 1000°C .
Application: Essential for HVAC diagnostics, furnace troubleshooting, refrigeration maintenance, and appliance repair .
This mode uses low input impedance to eliminate "ghost voltages"—capacitively coupled voltages that can cause false readings .
Application: Ideal for verifying whether a circuit is truly de-energized before working on it .
Set the rotary switch to the V position .
The meter defaults to DC; press the function button to switch between DC and AC measurement .
Connect test leads in parallel to the circuit under test .
High-voltage alarm provides audible and visual warnings when measuring above 990V .
Set the rotary switch to the appropriate μA, mA, or A position .
Use the SEL button to choose between DC and AC current .
Connect the test leads in series with the circuit under test .
The UT61D+ supports current measurement up to 20A, compared to 10A on the UT61B+ .
Press the PEAK button to capture and display peak voltage or current values .
Application: Ideal for analyzing transient signals, inrush currents, and voltage spikes .
Set the rotary switch to the **Ω/))) ** position .
For resistance, connect test leads across the component (up to 60MΩ) .
For continuity, press SEL to select the continuity test. The buzzer sounds when resistance is <50Ω, confirming a complete circuit .
For diode test, connect leads across the diode to measure forward voltage drop .
Set the rotary switch to the capacitance position .
Fully discharge capacitors before testing to avoid damage to the meter .
Connect test leads in parallel with the capacitor .
Measures up to 60mF for motor start capacitors and power supply filtering .
Set the rotary switch to the Hz/% position .
Connect test leads to the signal source .
Measure frequencies up to 10MHz and duty cycles from 0.1% to 99.9% .
Bring the top of the meter near a live conductor .
The meter provides audio and visual alarms to indicate the presence of an AC electric field (>100V), enhancing safety .
Connect the included USB cable to transfer measurement data to a computer .
Ideal for data logging, analysis, and documentation in professional and educational settings .
Data Hold: Freeze the current reading on the display .
MAX/MIN: Record and display the highest and lowest readings during a measurement period .
REL Mode: Zero out test lead resistance or set a reference value for comparative measurements .
Auto Power Off: Conserves battery life by shutting down after approximately 15 minutes of inactivity .
The UT61D+ incorporates multiple advanced safety features to protect users :
CAT III 1000V / CAT IV 600V Rating: Suitable for measurements on distribution circuits and primary power supplies .
Full-Range Overload Protection: Comprehensive protection on all measurement ranges .
Audible and Visible Alarms: Provides warnings when measuring high voltage/current and temperature .
High Current Overheating Alarm: Triggers when input current exceeds safe levels .
Input Protection: High-energy fuse protection on current ranges .
Input Impedance: ≥10MΩ for DCV measurements minimizes circuit loading .
Low Battery Indication: Alerts user when batteries need replacement .
The UNI-T UT61D+ is an ideal all-in-one tool for:
Measuring vent temperatures, superheat, and subcooling with the included thermocouple .
Troubleshooting furnaces, air conditioners, and refrigeration systems .
Using LoZ mode to eliminate ghost voltages when verifying de-energized circuits .
Diagnosing motor drives and variable frequency drives with extended 1kHz bandwidth .
Verifying wiring and phase conditions .
Precision component testing with 6000-count resolution .
Frequency analysis for signal generators and oscillators up to 10MHz .
Diode and continuity testing for PCB troubleshooting .
Testing battery voltage and alternator output .
Sensor signal frequency analysis .
Temperature monitoring of engine components (with thermocouple) .
Robust and accurate meter for teaching and conducting experiments .
USB connectivity enables data collection for student projects .
Comprehensive functionality for diverse measurement needs .
Users consistently praise the UT61D+ for its excellent build quality, accuracy, and comprehensive feature set, particularly noting the value of the included temperature probe for HVAC work . The extended 1kHz bandwidth and LoZ mode are frequently highlighted as key differentiators from the UT61B+ model .
The UNI-T UT61D+ is the definitive choice for HVAC technicians and professionals who need temperature measurement capability combined with extended bandwidth for motor and drive diagnostics . Its included K-type thermocouple, 40Hz-1kHz frequency response, LoZ mode, and 20A current range make it exceptionally well-suited for HVAC work, industrial maintenance, and general electrical troubleshooting
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