UNI-T 1000A True RMS Digital Clamp Meter

Preface

Thank you for purchasing the new clamp meter. To ensure safe and correct usage, please read this manual thoroughly, paying special attention to the Safety Instructions section. After reading, keep this manual in an easily accessible location, preferably near the device, for future reference.

Safety Instructions

Warning:

Before each use, verify meter operation by measuring a known voltage. If the meter is used in a manner not specified by the manufacturer, the protection provided by the equipment may not be guaranteed.

1. Before use, check for any damaged or abnormal items (e.g., bare test lead, damaged meter casing, broken LCD). If found, or if the meter is malfunctioning, do not continue to use it.
2. Do not use the meter if the rear cover or battery cover is not completely closed, as this may pose a shock hazard.
3. When using the meter, keep fingers behind the finger guards of the test leads and avoid touching exposed wires, connectors, unused inputs, or circuits being measured to prevent electric shock.
4. The function dial should be set to the correct position before measurement.
5. Do not apply voltage over 1000V between any meter terminal and earth ground to prevent electric shock or damage.
6. Use caution when working with voltage above AC 30Vrms, 42Vpeak, or DC 60V, as such voltages pose a shock hazard.
7. Never input voltage or current exceeding the specified limit. If the measured value range is unknown, select the maximum range.
8. Before measuring resistance, diode, and continuity, switch off the circuit's power supply and fully discharge all capacitors to avoid inaccurate measurements.
9. When the low battery symbol appears on the LCD, replace the batteries promptly to ensure measurement accuracy. If the meter is not used for a long time, remove the batteries.
10. Do not alter the meter's internal circuit to avoid damage to the meter and user.
11. Do not use or store the meter in high temperature, high humidity, flammable, explosive, or strong magnetic field environments.
12. Clean the meter casing with a soft cloth and mild detergent. Do not use abrasives or solvents.

Electrical Symbols

Product Overview

The UNI-T UT205E/UT206B/UT207B/UT208B is a 6000-count handheld True RMS clamp meter with auto-ranging capabilities. It features full-scale overload protection and offers a wide range of measurement functions.

Key Features:

• AC/DC voltage, AC current, resistance, diode, continuity, capacitance, frequency, duty ratio, data hold, MAX/MIN, relative measurements.
• DC current measurement (UT207B/UT208B models).
• Temperature measurement (UT206B/UT208B models).
• LPF (low pass filter) and LoZ (low impedance) voltage measurement (UT206B/UT207B/UT208B models).
• Inrush current measurement (UT206B/UT207B/UT208B models).
• Analog bar display (UT206B/UT207B/UT208B models).
• Flashlight, NCV (Non-Contact Voltage), low battery indication, and auto power off.
• The UT206B/UT208B models can be equipped with a flexible current probe to extend the AC current measurement range up to 3000A (optional accessory).

Accessories

Upon opening the package, please verify that the following items are included and undamaged:

• User manual (1 pc)
• Test leads (1 pair)
• K-type thermocouple (1 pc) (Only for UT206B/UT208B)
• Cloth bag (1 pc)
• 1.5V AAA batteries (3 pcs)
• Flexible current probe (optional accessory) (Only for UT206B/UT208B)

If any item is missing or damaged, contact your supplier immediately.

Image: Product family portrait, illustrating the clamp meter and its included accessories.

External Structure

Image: Labeled diagram of the clamp meter's external components.

1. Clamp jaws: Used to clamp around a conductor for current measurement.
2. Hand guard: Provides protection for the user's hand.
3. LED indicator light: Illuminates for various indications, such as NCV detection.
4. Jaw opening trigger: Used to open the clamp jaws.
5. Function dial: Rotary switch to select measurement functions.
6. LCD display: Shows measurement readings and other indicators.
7. Function buttons: Buttons for selecting ranges, modes, and other features.
8. NCV sensor: Detects non-contact AC voltage.
9. FLIGHT button: Activates the flashlight.
10. Flashlight LED light: Provides illumination in dark environments.
11. Battery cover: Access to the battery compartment.
12. Input jacks: Ports for connecting test leads.

Image: The clamp meter features large jaws, opening up to 42mm, suitable for measuring multiple conductors.

Image: High-tech induction clamp head for accurate small current sensing.

LCD Display

The large LCD provides a high-definition display with auto backlight for easy reading in dark environments.

Common Display Indicators:

• Low battery: Indicates when batteries need replacement.
• Diode test: Symbol for diode measurement mode.
• High voltage: Indicates detection of high voltage.
• Auto power off: Indicates the auto power off function is active.
• AC signal: Indicates AC measurement.
• DC signal: Indicates DC measurement.
• Data hold: Indicates that the current reading is held on the display.
• Relative value: Indicates relative measurement mode.
• Continuity test: Symbol for continuity measurement mode.
• Unit: Displays the unit of measurement (e.g., V, A, Ω, F, Hz, °C/°F).
• Auto range: Indicates auto-ranging is active.
• Max/Min measurement: Displays maximum or minimum recorded values.
• NCV: Indicates Non-Contact Voltage detection mode.
• Inrush current measurement: Indicates inrush current measurement mode.
• Low impedance measurement: Indicates LoZ mode.
• Analog bar: Provides a visual representation of the measured value.
• Flexible current probe range indicator: Shows the range when using the flexible current probe.
• Temperature measurement: Indicates temperature measurement mode.
• Low pass filter measurement: Indicates LPF mode.

Function Switch Dial and Buttons

Function Dial Positions:

Function Buttons:

Note: Short press: pressing a button for less than 2 seconds. Long press: pressing a button for more than 2 seconds.

• SELECT Button: Short press to switch between functions for each dial position. Long press to enable/disable the LPF function in voltage mode.
• HOLD/☀ Button: Short press to turn on/off data hold. Long press to turn on/off backlight.
• MAX/MIN Button: Short press to enter maximum/minimum measurement mode (auto power off is disabled in this mode). Long press to exit MAX/MIN mode. Valid for ACV, LoZ V∽, DCV, ACA, DCA, Ω, CAP, °C/°F, and flexible current probe measurements.
• REL or REL ZERO Button: Short press to enter/exit relative value measurement mode. LCD displays "∆". Displayed value = measured value - reference value. Valid for ACV, DCV, ACA, Ω, and CAP (for CAP, REL clears the base). In DCA mode, short press REL ZERO to enter/exit zero mode.
• RANGE Button: Short press to enter manual range mode and change the range. Long press to exit manual range mode. Valid for ACV, LPF ACV, LoZ V∽, DCV, ACA, DCA, CAP (UT205E only), and Ω.
• Hz/INRUSH Button: Short press to enter/exit frequency measurement mode. Valid for ACV, LPF ACV, LoZ V∽, ACA, and flexible current probe measurements. Long press to enter inrush current measurement mode (~100ms measurement time). Long press again to exit.
• FLIGHT Button: Short press to turn on/off the flashlight.

Operating Instructions

1. AC Current Measurement

1. Turn the function dial to the A∽, A∽, or A— position.
2. Press the trigger to open the clamp jaws and fully enclose one conductor (only one conductor can be measured at a time). For optimal results, center the conductor in the jaws.

Note:

• Current measurement should be taken within 0°C∼40°C. Avoid suddenly releasing the trigger, as impact may change the reading.
• To ensure accuracy, center the conductor within the jaws. Otherwise, ±1.0% additional error may occur.
• When testing high current, slight vibration of the clamp is normal.

Image: Clamp meter measuring current on an electrical panel.

2. Current Frequency Measurement (AC Current)

1. When the function dial is in the AC current position, short press the Hz or Hz/INRUSH button to enter frequency measurement mode.
2. Short press the Hz or Hz/INRUSH button again to exit frequency measurement mode.

3. Inrush Current Measurement (for AC current)

1. Select the proper range with the RANGE button, or long press the Hz/INRUSH button to enter inrush current measurement mode.
2. Start the appliance under test and measure its instantaneous inrush current.
3. Long press the Hz/INRUSH button again to exit inrush current measurement mode.

4. DC Current Measurement

1. Turn the function dial to the A— or A∽ position.
2. Short press the SELECT button to switch to DC current measurement. If the LCD display is not zero, short press the REL ZERO button to clear it.
3. Press the trigger to open the clamp jaws and fully enclose one conductor. For optimal results, center the conductor within the jaws.

Note:

• DC current measurement must be taken within 0°C∼40°C. If the reading is positive, the current direction is from top to bottom (from panel to cover).
• After large DC current measurement, the open circuit base may be too large. Perform an AC current test to eliminate residual magnetic signals from the jaws.

5. Measurement by Flexible Current Probe (UT206B/UT208B)

1. Turn the function dial to the 📌A∽ or 📌A— position.
2. Insert the flexible current probe into the VΩHz%°C°F and COM jacks.
3. The meter will automatically switch to the flexible current probe with the extended current range, displayed on the LCD.

6. AC Voltage and LPF ACV Measurement

1. Insert the red test lead into the VΩHz%°C°F jack and the black test lead into the COM jack.
2. Turn the function dial to V∽ or V— position.
3. Short press the SELECT button to switch to AC voltage measurement if required, and connect the test leads to the measured load or power supply in parallel.

Note:

• Do not input voltage above 1000V. It may damage the meter.
• Be cautious to avoid electric shock when measuring high voltage.
• After measurement, disconnect test leads from the circuit.
• If measured voltage is above 30V, the LCD will display the high voltage alarm prompt "⚠".

7. DC Voltage Measurement

1. Insert the red test lead into the VΩHz%°C°F jack and the black test lead into the COM jack.
2. Turn the function dial to V∽ or V— position.
3. Short press the SELECT button to switch to DC voltage measurement if required, and connect the test leads to the measured load or power supply in parallel.
4. Read the voltage value on the display.

Note:

• When measuring at 600mV range, use "REL" mode for accurate readings. Short-circuit test leads, then short press REL or REL ZERO. Read the measured voltage after the short-circuited test leads' voltage is subtracted.

8. LoZ Measurement

1. Insert the red test lead into the VΩHz%°C°F jack and the black test lead into the COM jack.
2. Turn the function dial to the LoZ V∽ position, and connect the test leads to the measured load or power supply in parallel.

Note:

• Test known voltage before use to verify correct function.
• After using LoZ function, let the meter rest for 3 minutes before next use.
• LoZ voltage measurement eliminates ghost voltage for more accurate measurement.

9. Resistance Measurement

1. Insert the red test lead into the VΩHz%°C°F jack and the black test lead into the COM jack.
2. Turn the function dial to the Ω position, and short press the SELECT button to switch to resistance measurement if required. Connect test leads to both ends of the measured resistance in parallel.

Note:

• If the measured resistor is open or resistance exceeds maximum range, LCD displays "OL".
• Before measuring resistance online, switch off power supply and fully discharge capacitors.
• When measuring low resistance, test leads produce 0.1Ω∼0.2Ω error. Use "REL" mode. Short-circuit test leads, then short press REL or REL ZERO.
• If resistance is not less than 0.5Ω when test leads are short-circuited, check test leads for abnormalities.
• When measuring resistance above 1MΩ, it may take a few seconds to stabilize.

10. Continuity Test

1. Insert the red test lead into the VΩHz%°C°F jack and the black test lead into the COM jack.
2. Turn the function dial to the 🔊 position, short press SELECT to switch to continuity test. Connect test leads to both ends of measured load in parallel.
3. If measured resistance ≤30Ω, the circuit is in good conduction and the buzzer beeps continuously. If resistance ≥70Ω, there will be no beep.

11. Diode Test

1. Insert the red test lead into the VΩHz%°C°F jack and the black test lead into the COM jack. Red lead is "+", black lead is "-".
2. Turn the function dial to the →| position, and short press SELECT to switch to diode test.
3. Connect the red probe to the diode anode and black to the diode cathode.
4. Read the approximate forward voltage of the diode. For silicon PN junction, normal value is 500∼800 mV.

Note:

• If the diode is open or polarity is reversed, LCD displays "OL".
• Before measuring diode online, switch off power supply and fully discharge capacitors.

12. Capacitance Measurement

1. Insert the red test lead into the VΩHz%°C°F jack and the black test lead into the COM jack.
2. Turn the function dial to the ⊤ position, short press SELECT to switch to capacitance measurement. Connect test leads to both ends of the measured capacitance in parallel.

Note:

• If the measured capacitor is short-circuited or capacitance exceeds maximum range, LCD displays "OL".
• Analog bar pointer is disabled in capacitance measurement mode. For capacitance >600µF, it may take time to stabilize readings.
• Before measuring, fully discharge all capacitors (especially high-voltage capacitors) to avoid damage.

13. Frequency/Duty Ratio Measurement

1. Insert the red test lead into the VΩHz%°C°F jack and the black test lead into the COM jack.
2. Turn the function dial to the Hz% position, and connect the test leads to both ends of the measured signal source in parallel.
3. Short press the SELECT button to switch to frequency/duty ratio measurement.

14. Temperature Measurement (UT206B/UT208B)

1. Turn the function dial to the °C/°F position. The LCD will display "OL". Ambient temperature will be displayed if test leads are short-circuited.
2. Insert the K-type thermocouple into the meter.
3. Use the temperature sensor to measure the object surface and read the Celsius temperature value on the LCD.
4. Short press the SELECT button to switch to Fahrenheit temperature measurement.

Note:

• The meter's ambient temperature should be 18-28°C; otherwise, measurement error may occur, especially in low temperatures.
• After completing measurement, remove the thermocouple.

15. Non-contact AC Voltage Sensing (NCV)

1. Turn the function dial to the NCV position, and bring the NCV sensor close to the wire under test.
2. If AC voltage or an electromagnetic field is present, the LCD will display sensing intensity from weak to strong by "-". The buzzer will beep intermittently, and the LED indicator will be on. If no voltage is sensed, the LCD displays "EF".

Image: NCV non-contact measurement in progress.

Specifications

General Specifications:

• Max Display: 6000 counts
• Polarity Display: Auto
• Overload Display: "OL" or "-OL"
• Low Battery Indication: ⚠ is displayed.
• Sampling Rate: 3 times/s
• Sensor Type: Coil induction (UT205E/UT206B), Hall effect sensor (UT207B/UT208B)
• Test Position Error: If the source under test is not placed at the center of the clamp jaws when measuring current, ±1.0% additional error in reading may be produced.
• Jaw Opening: 42mm
• Battery: 3×1.5V AAA
• Auto Power Off: 15 minutes (can be disabled)
• Dimensions: 272mm×81mm×43.5mm
• Weight (including batteries): About 492g (UT205E/UT206B), 447g (UT207B/UT208B)

Environmental Specifications:

• Operating Altitude: 2000m
• Safety Standards: IEC61010-1, IEC61010-2-032, IEC61010-2-033; CAT III 1000V, CAT IV 600V
• Pollution Degree: 2
• Operating Temperature and Humidity: 0°C∼30°C (≤80%RH), 30°C∼40°C (≤75%RH), 40°C∼50°C (≤45%RH)
• Storage Temperature and Humidity: -10°C∼60°C (≤80%RH)
• Electromagnetic Compatibility: When RF=1V/m, overall accuracy = specified accuracy + 5% of range. When RF>1V/m: not specified.

Electrical Specifications:

Accuracy: ±(a% of reading + b digits), 1 year calibration cycle

Ambient Temperature: 23°C±5°C

Ambient Humidity: ≤80%RH

Note:

To ensure measurement accuracy, the operating temperature should be within 18°C∼28°C and the fluctuation range should be within ±1°C. When the temperature is <18°C or >28°C, add temperature coefficient error 0.1 x (specified accuracy)/°C.

AC Current (∽A)

Inrush Current (A)

DC Current (—A)

AC Voltage (∽V)

LPF ACV

LoZ V∽

DC Voltage (—V)

Resistance (Ω)

Capacitance (⊤)

Temperature (°C/°F)

Frequency/Duty Ratio (Hz%)

Maintenance

Warning:

Before opening the rear cover of the meter, remove the test leads to avoid electric shock.

1. General Maintenance

1. Maintenance and service must be performed by qualified professionals or designated departments.
2. Clean the meter casing with a soft cloth and mild detergent. Do not use abrasives or solvents.

2. Battery Replacement

1. Turn off the meter and remove the test leads from the input jacks.
2. Unscrew and remove the battery cover.
3. Replace with 3 standard AAA batteries according to the polarity indication.
4. Secure the battery cover and tighten the screw.

Image: Battery replacement diagram.

3. Test Lead Replacement

If the insulation on the test lead is damaged, replace it.

Warning:

Test leads used for MAINS measurement should meet EN 61010-031 standard, rated CAT III 1000V, 10A or better.

Troubleshooting

• No display or faint display: Check battery level and replace if necessary. Ensure batteries are inserted with correct polarity.
• Inaccurate readings: Verify correct function selection and range. Ensure test leads are properly connected and not damaged. For current measurements, ensure the conductor is centered in the clamp jaws. For resistance/capacitance, ensure components are discharged.
• "OL" displayed: Indicates overload or open circuit. Select a higher range or check for open connections.
• "EF" displayed in NCV mode: No AC voltage detected.
• Meter does not turn on: Check battery installation. If auto power off is enabled, press any button (except FLIGHT) to wake it up.

User Tips

• The large jaw size of the clamp meter may limit access in tight spaces. Consider the application environment before use.
• The NCV (Non-Contact Voltage) function requires the sensor to be brought very close to the wire for detection.
• The included thin needle probes can be very useful for precise measurements in small terminals or circuits.

Warranty and Support

Limited Warranty and Liability

Uni-Trend guarantees that the product is free from any defect in material and workmanship for one year from the purchase date. This warranty does not cover damages caused by accident, negligence, misuse, modification, contamination, or mishandling. The dealer is not authorized to provide any other warranty on behalf of Uni-Trend.

For warranty service within the warranty period, please contact your seller directly.

Uni-Trend will not be responsible for any special, indirect, incidental, or subsequent damage or loss caused by the use of this device.

Manufacturer Contact: