UNI-T UT595 Multifunction Tester User Manual

1. Overview

The UNI-T UT593/UT595 is a comprehensive digital multifunctional electrical safety test instrument. It features a new design with large-scale integrated analog circuits, digital circuits, and microcomputer chip combination. This instrument is primarily used for measuring parameters such as RCD (Residual Current Device) electric leakage protection, loop circuit/line impedance, grounding continuity, insulation resistance, DC voltage, AC voltage, and phase sequence judgment. It offers high accuracy, stable performance, and is reliable and convenient to operate. The UT593/UT595 is an ideal choice for maintenance, testing, and inspection of electric protectors in various electrical equipment.

Key Features:

• 9999-count LCD display with analogue bar.
• 250V~1000V DC insulation resistance test.
• 200mA earth-resistance continuity test.
• Loop impedance/Prospective Fault Current (PFC)/Prospective Short Current (PSC) test.
• Lock test function.
• RCD trip time test with data storage.
• Full/Half wave and countdown (30s) test mode selectable.
• 0°/180° phase angle option for detecting the fastest trigger time.
• RCD trip current test (X2).
• RCD trip trigger current test.
• Phase sequence and missing test.
• AC/DC voltage auto check and test.
• Connection check with real-time status display.
• White backlight and auto power off.

2. Safety Warnings

This instrument is designed, manufactured, and inspected in accordance with IEC 61010 safety standards. To ensure safe operation and status of the instrument, users must follow the warnings and safety rules outlined below. Read these instructions carefully before use.

⚠ Danger

• Do not measure circuits with voltage above AC 440 V / DC 440V.
• Do not conduct tests in combustible environments where sparks could cause an explosion.
• Do not operate this instrument if its surface or the operator's hands are wet.
• During measurement, do not touch the conductive part of the test pen.
• Do not open the battery cover during measurement.
• Do not touch the circuit under test when conducting insulation measurement and electric leakage protector measurement.

⚠ Warning

• If any abnormality occurs (e.g., instrument damage, exposed metal parts), stop using it immediately.
• Exercise caution when working with voltages exceeding 33Vrms, 46.7Vacrms, or 70 Vdc, as this can cause electric shock.
• After high resistance measurement, ensure that electric charges stored in the circuits under test are fully released.
• Do not change the battery when the instrument is wet.
• Ensure all test wires are firmly connected to the instrument's test ports.
• Ensure the instrument is shut down before opening the battery cover.

ⓘ Notice

• Before resistance measurement, the circuits must be completely discharged and isolated from power supply circuits.
• If a test pen is damaged, replace it with one of the same model and electrical specification.
• When the battery indicator shows low power, do not use the instrument.
• If the instrument will not be used for a long time, remove the batteries for storage.
• Do not store or operate this instrument in high temperature, high humidity, inflammable/explosive conditions, or strong electromagnetic fields.
• Clean the instrument's shell with a wet cloth and cleaning agent; avoid abrasive objects or solvents.
• If the instrument becomes wet, dry it thoroughly before storage.

3. Definition of Symbols

The instrument's design and production adhere strictly to IEC 61010 safety standards, complying with and passing voltage safety standard (CAT III 300V) and pollution class II standard. It also features an automatic voltage discharge function.

4. Setup and Preparation Before Measurement

Before commencing any measurement, ensure the instrument is properly prepared and safe to use.

4.1 Battery Installation

The instrument requires 8 pieces of 1.5V (AA) alkaline batteries. If the LCD displays the low battery symbol (⎕), the batteries need replacement.

1. Turn off the power by setting the rotary switch to OFF.
2. Remove all test leads from the instrument.
3. Unscrew the screws on the battery compartment cover and remove the cover.
4. Replace the 8 pieces of 1.5V (AA) batteries, ensuring correct polarity.
5. Replace the battery cover and tighten the screws securely.

4.2 Initial Checks

• Verify that the instrument is clean and dry.
• Inspect test leads for any damage or wear. Replace if necessary.
• Ensure the battery level is sufficient for the planned measurements.

5. Operating Instructions

This section details the operation of the UNI-T UT595 for various measurement functions.

5.1 Rotary Switch Functions

The rotary switch selects the desired measurement mode:

1. Phase-sequence measurement
2. Voltage/frequency measurement
3. 250V insulation resistance measurement
4. 500V insulation resistance measurement
5. 1000V insulation resistance measurement
6. Measurement of maximum 200mA grounding continuity (Ω)
7. Shutdown (OFF)
8. Measurement of loop circuit/expected fault current/line circuit impedance/expected short-circuit current (LOOP)
9. Automatic RCD measurement (AUTO RCD)
10. RCD tripping time 50% action current measurement
11. RCD tripping time 100% action current measurement
12. RCD tripping time 200% action current measurement (UT595 only)
13. RCD tripping time 500% action current measurement
14. RCD tripping action trigger current measurement (▲ Ramp)

5.2 Function Keys (F1-F4)

5.3 Grounding Continuity Measurement (Ω)

To measure grounding continuity:

1. Insert the red test lead into the "Red" input port and the black test lead into the "Black" input port.
2. Connect the red and black alligator clips or test probes to the circuit under test.
3. Set the rotary switch to the Ω position.
4. Press the TEST key to start the measurement.

5.4 Insulation Resistance Measurement

Before measuring insulation resistance, ensure the circuit is completely discharged and isolated from the power supply.

1. Insert the red test lead (or special pen with TEST key) into the "Red" input port, and the black test lead into the "Black" input port.
2. Connect the red and black alligator clips or test probes to the circuit under test.
3. Set the rotary switch to the desired insulation voltage (250V, 500V, or 1000V).
4. Press the TEST key to start the measurement.

5.5 Voltage/Frequency Measurement

To measure voltage and frequency:

1. Set the rotary switch to "Volts".
2. Insert the red test lead into the "Red" input port and the black test lead into the "Black" input port.
3. Connect the red and black alligator clips or probes to the circuit under test. The instrument will automatically identify AC/DC voltage and display the measured voltage and frequency on the LCD.
4. Alternatively, for power plug connections, insert special red, green, and black test lines with power plugs into the corresponding input ends on the side of the instrument. Insert the plugs into the circuit socket. The instrument will automatically identify AC/DC voltages and display the measured voltage and frequency.

5.6 Phase Sequence and Phase Loss Measurement

To measure phase sequence and detect phase loss:

1. Set the rotary switch to "Phase Rotary".
2. Connect the black test pen to L1, the green test pen to L2, and the red test pen to L3.
3. After connection, the LCD will immediately display the phase sequence.

5.7 Loop Impedance / Fault Expected Short-Circuit Current Measurement

To measure loop impedance and fault expected short-circuit current:

1. Set the rotary switch to "LOOP".
2. Insert special red, green, and black lines with power plugs and test probes into the corresponding input ends on the side of the instrument.
3. Connect the plugs or test probes into a power frequency civil 220V socket or circuit.
4. Press the TEST key to start the measurement.

5.8 Automatic RCD Sequence Test

This test performs a sequence of RCD tripping time measurements automatically.

1. Set the rotary switch to "AUTO RCD".
2. Insert special red, green, and black lines with power plugs into the corresponding input ends.
3. Connect the plugs into a power frequency civil 220V socket.
4. Press the TEST key to start the automatic RCD sequence test.

The instrument will measure 6 items of RCD tripping time in sequence. Press F3 to view stored data after completion.

Sequence of RCD tests:

• 1/2*IΔn / 0°
• 1/2*IΔn / 180°
• 1*IΔn / 0°
• 1*IΔn / 180°
• 5*IΔn / 0°
• 5*IΔn / 180°

5.9 General RCD Test

This allows for individual RCD tripping time tests at specific current multiples.

1. Set the rotary switch to the desired RCD test item (e.g., 1/2*IΔn, 1*IΔn, 2*IΔn, 5*IΔn).
2. Connect the test leads as described for automatic RCD test.
3. Press F1 to switch between 0° and 180° phase angles.
4. Press F2 to switch between RCD test type (full-wave/half-wave) and countdown mode.
5. Press F4 to select the rated leakage current (10mA, 30mA, 100mA, 300mA, 500mA).
6. Press the TEST key to start the RCD test.

5.10 Test of RCD Tripping Action Trigger Current (▲ Ramp)

This test determines the actual tripping current of an RCD.

1. Set the rotary switch to the "▲ Ramp" test item in RCD.
2. Connect the test leads as described for automatic RCD test.
3. Press F1 to switch between 0° and 180° phase angles.
4. Press F2 to switch between RCD test type (full-wave/half-wave) and countdown mode.
5. Press F4 to select the rated leakage current.
6. Press the TEST key to start the RCD tripping action trigger current test.

6. Specifications

The following tables detail the technical specifications of the UNI-T UT595 Multifunction Tester.

6.1 General Characteristics

• Display: Liquid-crystal display, maximum reading 9999
• Low battery warning: Diagram of battery
• Overrun indication: "OL"
• Automatic range function: Yes
• Unit display: Function and symbol of quantity of electric charge unit
• Working conditions: 0°C~40°C, relative humidity 85% or below
• Storage conditions: -20°C~60°C, relative humidity 90% or below
• Physical dimension: 210mm (L) x 175mm (W) x 90mm (D)
• Current consumption: About 50mA (at max output of 1000V), normally about 10 mA
• Power supply: 8 x 1.5V (AA) alkaline batteries
• Weight: 1kg (including battery)

6.2 Product Properties

7. Maintenance

7.1 Cleaning

• Clean the instrument's shell with a soft, damp cloth and a mild cleaning agent.
• Do not immerse the instrument in water to avoid damage.
• If the instrument becomes wet, dry it thoroughly before storage.

7.2 Storage

• Store the instrument in a dry, cool place, away from direct sunlight and extreme temperatures.
• If storing for an extended period, remove the batteries to prevent leakage.

7.3 Professional Service

For calibration, inspection, or maintenance beyond basic cleaning, hand the instrument over to competent professional maintenance personnel or the specified maintenance department.

8. Troubleshooting

This section provides guidance for common issues you might encounter.

9. User Tips

• Always perform a ZERO calibration (using F3) before critical resistance or continuity measurements for optimal accuracy.
• Utilize the 'Test Lock' function (F2) for extended measurements where continuous monitoring is required, reducing user fatigue.
• When conducting RCD tests, experiment with both 0° and 180° phase angles to identify the fastest trip time, which is crucial for safety compliance.
• For clear visibility in various lighting conditions, remember to use the backlight function (press and hold F1).
• Regularly check the battery indicator and replace batteries proactively to avoid interruptions during important tests.
• Keep the test leads organized and free from tangles to prevent damage and ensure quick setup.

10. Warranty and Support

This product is manufactured by Uni-Trend Technology (CHINA) Limited. For technical support, service, or warranty inquiries, please contact the manufacturer directly.

Manufacturer Contact Information:

Uni-Trend Technology (CHINA) Limited
Dong Fang Da Dao, Bei Shan Dong Fang Industrial District,
Hu Men Town, Dongguan City, Guang Dong Province, China
Postal Code: 523 925

Headquarters Contact Information:

Uni-Trend Group Limited
Rm901, 9/F, Nanyang Plaza,
57 Hung To Road, Kwun Tong,
Kowloon, Hong Kong
Tel: (852) 2950 9168
Fax: (852) 2950 9303
Email: info@uni-trend.com
Website: http://www.uni-trend.com

For a complete digital version of this manual, please refer to the official PDF document: UNI-T UT593/595 Operating Manual (PDF).