UNI-T UT220 Digital Clamp Meter, 2000 A AC, 63 mm Jaw, CAT III 1000 V

The UNI-T UT220 is a digital clamp meter designed to measure alternating current up to 2000 A without disconnecting the conductor. It also measures AC and DC voltage and resistance and provides continuity and diode testing. Its large jaw opening, automatic voltage and resistance ranging, and backlit display make it suitable for electrical installation inspection and equipment maintenance.

Key specifications: AC current up to 2000 A • AC voltage up to 750 V • DC voltage up to 1000 V • 63 mm jaw opening • CAT III 1000 V / CAT IV 600 V

Key features and benefits

• AC current measurement up to 2000 A – selectable 200 A and 2000 A ranges allow different current levels to be measured without disconnecting the conductor.
• 63 mm jaw opening – accommodates conductors up to 60 mm in diameter, including larger electrical cables.
• AC and DC voltage measurement – measures up to 750 V AC and 1000 V DC using test leads.
• Resistance, continuity and diode testing – provides additional functions for checking electrical circuits, wiring connections and electronic components.
• Automatic ranging – automatically selects the appropriate range when measuring voltage and resistance.
• MAX and HOLD functions – capture the highest observed reading or retain the current measurement on the display.
• Backlit LCD – improves readability in poorly illuminated working environments.
• CAT III 1000 V / CAT IV 600 V safety ratings – support measurements in appropriately rated electrical installations when the specified operating limits and safety precautions are observed.

Applications

The UNI-T UT220 is intended for electricians, electrical maintenance technicians and users who need to measure high AC currents. Typical applications include checking electrical distribution equipment, power supply circuits, electric motors and other AC-powered equipment.

The clamp measures current without opening the circuit. Voltage, resistance, continuity and diode measurements are performed using test leads.

Compatibility and limitations

• Clamp current measurement is available for alternating current (AC) only.
• DC current cannot be measured with the clamp.
• The meter does not support True RMS. AC measurements use an average-responding method, so accuracy may differ when measuring distorted waveforms.
• The specified AC current measurement frequency range is 50–60 Hz.
• Clamp current measurements require a single current-carrying conductor rather than an entire multicore cable.
• Frequency, capacitance and temperature measurement functions are not available.

Technical specifications

Parameter	Specification
Product type	Digital clamp meter
AC current ranges	200 A / 2000 A
AC current resolution	0.1 A / 1 A
AC current accuracy	±(2.5% + 5 digits)
AC current frequency range	50–60 Hz
AC current overload protection	2500 A
AC voltage ranges	2 V / 20 V / 200 V / 750 V
AC voltage resolution	0.001 V / 0.01 V / 0.1 V / 1 V
AC voltage accuracy, 2–200 V ranges	±(1.2% + 5 digits)
AC voltage accuracy, 750 V range	±(1.5% + 5 digits)
AC voltage frequency range	40–400 Hz; 50–100 Hz for voltages below 400 mV
DC voltage ranges	2 V / 20 V / 200 V / 1000 V
DC voltage resolution	0.001 V / 0.01 V / 0.1 V / 1 V
DC voltage accuracy, 2 V range	±(0.8% + 3 digits)
DC voltage accuracy, 20–200 V ranges	±(0.8% + 1 digit)
DC voltage accuracy, 1000 V range	±(1.0% + 3 digits)
Resistance ranges	200 Ω / 2 kΩ / 20 kΩ / 200 kΩ / 2 MΩ / 20 MΩ
Resistance resolution	0.1 Ω / 0.001 kΩ / 0.01 kΩ / 0.1 kΩ / 0.001 MΩ / 0.01 MΩ
Resistance accuracy, 200 Ω	±(1.2% + 2 digits)
Resistance accuracy, 2 kΩ – 200 kΩ	±(1.0% + 2 digits)
Resistance accuracy, 2 MΩ	±(1.2% + 2 digits)
Resistance accuracy, 20 MΩ	±(1.5% + 2 digits)
Continuity testing	Audible indication below 10 Ω
Diode testing	Supported; 0.001 V resolution
Diode test open-circuit voltage	Approximately 1.5 V
Voltage measurement input impedance	Greater than 10 MΩ
Display	2000-count LCD
Sampling rate	Approximately 3 readings per second
Range selection	Automatic for voltage and resistance; selectable 200 A / 2000 A current ranges
Additional functions	MAX, HOLD, display backlight, low battery indication
Jaw opening	63 mm
Maximum conductor diameter	60 mm
Safety ratings	CAT III 1000 V / CAT IV 600 V
Safety standards	IEC/EN 61010-1, IEC/EN 61010-2-032, IEC/EN 61010-2-033
Insulation	Double insulation
Pollution degree	2
Operating temperature	0–50 °C
Operating relative humidity	Up to 80% (0–30 °C); up to 75% (30–40 °C); up to 45% (40–50 °C)
Storage temperature	−20 to +60 °C
Maximum operating altitude	2000 m
Power supply	9 V, 6F22-type battery
Display dimensions	43 × 30 mm
Product dimensions	298 × 107 × 47 mm
Weight	Approximately 389 g

Accuracy note: accuracy is expressed as ±(percentage of reading + number of least significant digits), at an ambient temperature of 23 ± 5 °C and relative humidity below 80%.

Design and operation

The meter features a rotary function selector and dedicated function buttons. A trigger opens the clamp jaws to accommodate the conductor, while the protective handle design helps the operator maintain a safe grip.

The backlit LCD displays measurement results, selected functions and status indicators. Voltage, resistance, continuity and diode measurements use the COM and measurement input terminals.

Important operating and safety notes

• Do not exceed the 2000 A current measurement limit or the 750 V AC / 1000 V DC voltage measurement limits.
• Position the conductor as close as possible to the centre of the clamp jaws. Incorrect positioning may introduce an additional measurement error of up to 1%.
• Before measuring resistance, testing diodes or checking continuity, disconnect power from the circuit and discharge all capacitors.
• Avoid continuous high-current measurements for extended periods, as heating of the magnetic circuit may affect measurement accuracy.
• Do not use the meter if the enclosure, insulation or test leads are damaged.

Package contents

• UNI-T UT220 digital clamp meter.
• Pair of test leads.
• Carrying case.