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The UNI-T UT207A is a professional-grade, 3999-count digital clamp meter engineered for electricians, industrial maintenance technicians, and professionals who need to measure high currents up to 1000A AC/DC on large conductors . As part of UNI-T's respected UT200 series, this rugged instrument is specifically designed to handle demanding measurements in power distribution, industrial machinery, and heavy electrical equipment.
The standout feature of the UT207A is its massive 55mm jaw opening, allowing it to clamp around thick industrial cables, busbars, and multiple conductors with ease—making it the ideal choice for work in switchgear, panel boards, and manufacturing environments . With the ability to measure both AC and DC current up to 1000A and DC voltage up to 1000V, this meter delivers professional-grade performance for heavy industrial applications.
Engineered with user safety as a priority, the UT207A is designed to meet CAT II 600V and CAT III 300V safety standards with full-range overload protection, ensuring reliable operation when working on distribution circuits and permanently installed equipment . Its rugged construction, large backlit LCD display, and comprehensive feature set make it the ideal choice for demanding work environments.
Massive 55mm Jaw Opening: Accommodates large industrial cables, busbars, and multiple conductors with ease—significantly larger than standard clamp meters .
High Current Capacity: Measures both AC and DC current up to 1000A with ±(2.5%+8) accuracy (AC) and ±(1.5%+5) accuracy (DC) .
Wide Voltage Range: Measures DC voltage up to 1000V and AC voltage up to 750V with basic DC accuracy of ±(0.8%+1) .
Comprehensive Testing: Includes resistance measurement up to 40MΩ, frequency up to 10MHz, duty cycle (0.1%~99.9%), diode test, and continuity test .
3999-Count LCD Display: Large 47mm × 30mm backlit display for clear readings in any lighting condition .
User-Friendly Features: Auto-ranging, data hold, ZERO mode for offset calibration, and auto power-off after 15 minutes of inactivity .
ZERO Calibration Button: Dedicated button for zeroing the display before DC current measurement and small resistance testing, improving accuracy .
Rugged Construction: 1-meter drop-proof design with durable ABS housing, weighing approximately 533g .
Safety Certified: Designed to IEC 61010 standards with CAT II 600V / CAT III 300V ratings and double insulation .
The UNI-T UT207A delivers professional-grade accuracy across a comprehensive range of electrical parameters.
| Item | Quantity |
|---|---|
| UNI-T UT207A Digital Clamp Meter | 1x |
| Test Leads | 1 pair |
| 9V Battery (6F22) | 1x |
| Tool Box / Carrying Case | 1x |
| User Manual | 1x |
| Warranty Card | 1x |
Note: Unlike the UT208A model, the UT207A does not include a temperature probe or capacitance measurement capability .
The UT200 series offers three distinct models with varying capabilities, with the UT207A serving as the entry-level high-current model :
| Feature | UT207A | UT208A | UT209A |
|---|---|---|---|
| Display Count | 3999 | 3999 | 3999 |
| AC/DC Current | 1000A | 1000A | 1000A |
| Temperature | No | Yes (-40°C~1000°C) | No |
| Capacitance | No | Yes (4nF~100μF) | No |
| AC Conversion | Average-responding | Average-responding | True RMS |
| Jaw Opening | 55mm | 55mm | 55mm |
| Best For | High-current industrial applications | HVAC + temperature + capacitance | True RMS measurements |
Set the rotary switch to the appropriate 40A, 400A, or 1000A position .
Press SELECT to switch between DC and AC measurement mode (DC is default) .
Press the trigger to open the 55mm clamp jaws and clamp around one conductor only—measuring multiple conductors will produce incorrect readings .
Center the conductor within the jaws for best accuracy; off-center placement can cause ±1.0% additional error .
For DC current measurement, press ZERO before measurement to null out any residual magnetism .
Note: When measuring AC current >1A, pressing the Hz button can measure frequency/duty cycle (reading for reference only) .
Set the rotary switch to the appropriate voltage position.
Connect test leads: red to the input terminal, black to the COM terminal .
Connect test leads in parallel to the circuit under test.
The meter has an input impedance of ≥10MΩ, minimizing circuit loading effects .
Connect test leads across the resistor.
For low-resistance measurements, short the test leads and press ZERO to subtract lead resistance .
Continuity Test: Press SELECT to select continuity mode. The buzzer sounds when resistance is <10Ω, confirming a complete circuit .
Diode Test: Press SELECT to select diode mode. Displays forward voltage drop (approx. 1.5V open circuit voltage) .
Always disconnect circuit power and discharge capacitors before testing.
Connect test leads to the signal source.
Duty cycle measurement ranges from 0.1% to 99.9% (for reference only) .
Press ZERO to store the current reading as a reference value .
Subsequent readings display the difference from the stored value.
Essential for:
Press again to release, or turn the rotary switch to exit hold mode.
Useful for capturing readings in difficult-to-see locations.
Press the HOLD button (or designated backlight button) to turn the LCD backlight on/off .
The backlight automatically turns off after approximately 15 seconds to conserve battery.
Meter automatically shuts down after approximately 15 minutes of inactivity to conserve battery life .
Press any button or turn the rotary switch to wake the meter.
To disable the sleep mode function, press and hold SELECT while turning the meter on .
The UT207A uses AC-coupled and average-responding conversion for AC measurements . For non-sine wave inputs, additional accuracy adjustments apply:
Peak factor 1.4~2.0: Add 1.0% to stated accuracy
Peak factor 2.0~2.5: Add 2.5% to stated accuracy
Peak factor 2.5~3.0: Add 4.0% to stated accuracy
For True RMS measurements, consider the UT209A model .
The UT207A incorporates multiple advanced safety features to protect users :
CAT II 600V / CAT III 300V Rating: Suitable for measurements on distribution circuits and permanently installed equipment .
Full-Range Overload Protection: Comprehensive protection on all measurement ranges .
Input Impedance: ≥10MΩ minimizes circuit loading for accurate readings.
Low Battery Indication: Battery symbol appears when voltage drops below operating level to prevent false readings .
Double Insulation: Complies with international double insulation requirements .
1-Meter Drop Protection: Withstands accidental falls from workbenches .
Finger Guards: Test leads include finger guards for safe handling .
The UNI-T UT207A's massive 55mm jaw opening and 1000A capacity make it uniquely suited for:
Troubleshooting motor control centers (MCCs) and switchgear.
Monitoring load currents on manufacturing equipment.
Measuring currents on transformers and main service entrances.
Checking feeder cables in substations.
Verifying phase loads on three-phase systems.
Commissioning new electrical installations.
Verifying load currents during plant start-ups.
Working in electrical rooms with large conductors.
Monitoring main distribution panel loads.
Troubleshooting large HVAC equipment and chillers.
Generator output verification.
Average Responding (Not True RMS): Uses average-responding AC conversion. For True RMS, consider UT209A .
No Temperature Measurement: Does not include temperature measurement (available on UT208A) .
No Capacitance: Does not measure capacitance (available on UT208A) .
AC Current Bandwidth: Limited to 50Hz-60Hz frequency response .
9V Battery: Uses 9V battery (6F22) instead of AAA batteries .
Continuity Voltage: Open circuit voltage for continuity is only 0.4V, which may not reliably trigger some solid-state circuits .
The UNI-T UT207A is the definitive choice for professionals who need a purpose-built tool for high-current AC/DC measurement in industrial environments. Its 55mm jaw opening is its standout feature—allowing measurements on large conductors and busbars that standard clamp meters simply cannot accommodate.
While it lacks the advanced features of its siblings (True RMS, temperature, capacitance), the UT207A excels at its primary mission: safe, reliable AC/DC current measurement up to 1000A with an exceptionally large jaw opening. This makes it the ideal tool for electricians working in manufacturing facilities, power distribution centers, and heavy industrial applications.
The inclusion of DC current measurement and a dedicated ZERO calibration button adds significant value for automotive, battery, and industrial applications where AC-only meters fall short.
Backed by CAT II 600V safety certification, 1-meter drop protection, and UNI-T's reputation for durability, the UT207A is a specialized workhorse that delivers where it counts—providing access to the largest conductors while maintaining professional-grade safety standards.
The UNI-T UT207A: Massive jaw, massive current, massive capability—for the toughest industrial applications.
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