Description

Introduction UNI-T UT502C Insulation Resistance Tester

The UNI-T UT502C Insulation Resistance Tester is the professional-grade megger that electrical engineers, maintenance technicians, and equipment inspectors across Bangladesh rely on to verify the integrity of insulation in transformers, UNI-T UT502C Insulation Resistance Tester motors, cables, switches, and electrical appliances. This advanced UNI-T UT502C Insulation Resistance Tester delivers test voltages of 250V, 500V, 1000V, and 2500V — covering the full range of insulation testing requirements for low-voltage to medium-voltage electrical systems. With a measurement range that reaches up to 20GΩ, the UT502C handles everything from routine motor maintenance checks to high-voltage cable commissioning inspections.

Specifications UNI-T UT502C Insulation Resistance Tester

Parameter	Range / Value	Accuracy
Insulation Resistance (250V)	0.01MΩ – 500MΩ	±(3%+5d)
Insulation Resistance (500V)	0.01MΩ – 2000MΩ	±(3%+5d)
Insulation Resistance (1000V)	0.01MΩ – 5000MΩ	±(3%+5d)
Insulation Resistance (2500V)	0.01MΩ – 20GΩ	±(3%+5d)
AC Voltage Measurement	30V – 750V AC	±(2%+5d)

 

Model	UNI-T UT502C
Brand	UNI-T (Uni-Trend Technology)
Test Voltage Levels	250V / 500V / 1000V / 2500V (4 selectable levels)
Maximum Insulation Range	20GΩ
AC Voltage Range	30V – 750V AC
Buzzer Alarm Threshold	< 4MΩ (sounds alarm when insulation resistance is too low)
Display	Large backlit LCD with MΩ/GΩ units, battery indicator, and functional symbols
Range Selection	Auto-range (automatic)
Data Hold	Yes
Self-Lock TEST Button	Yes (locks button for continuous measurement)
Overrange Indication	Yes (OL display)
Auto Power-Off	Yes (10 minutes of inactivity)
High-Voltage Warning Light	Red LED indicator — ON during high-voltage output
Power Supply	6 × 1.5V AA alkaline batteries; optional external DC 15V 0.6A adapter
Battery Life	Adequate for standard field insulation testing sessions
Safety Category	CAT III 600V, Pollution Degree II
Standard	IEC61010-1 (double-insulation overvoltage)
Operating Temperature	0°C – 35°C
Operating Humidity	≤ 75% RH
Storage Temperature	-20°C – 60°C
Storage Humidity	≤ 80% RH
Altitude	< 2000 m
Weight	Approx. 0.6 kg (including batteries)
Dimensions	Approx. 150 × 100 × 71 mm
Color	Red + Grey
Terminals	LINE, EARTH, GUARD, ACV
Accessories Included	Test leads (2×), alligator clips, user manual, carrying bag, strap
Certifications	CE certified; conforms to IEC61010-1

Key Features UNI-T UT502C Insulation Resistance Tester

1. Four Selectable Test Voltages: Choose 250V, 500V, 1000V, or 2500V via the rotary switch to match the insulation test requirement of any electrical equipment.
2. 20GΩ Maximum Measurement Range: Accurately measures insulation resistance from 0.01MΩ to 20GΩ, covering standard to high-resistance insulation conditions.
3. Auto-Range Function: Automatically selects the correct measurement range without manual input, speeding up the test process for busy technicians.
4. Large Backlit LCD Display: Shows measurement data, units (MΩ / GΩ), battery status, and functional symbols clearly — including in dark or dimly lit work environments UNI-T UT502C Insulation Resistance Tester
5. Buzzer Alarm (< 4MΩ): Sounds an audible alert when insulation resistance drops below 4MΩ, providing immediate warning of insulation degradation or breakdownUNI-T UT502C Insulation Resistance Tester
6. Red High-Voltage Warning Light: Illuminates whenever the tester outputs high voltage, keeping the operator aware of live test conditions at all times.
7. Data Hold Function: Freezes the measurement on the display so the technician can record readings without an assistant.
8. Self-Lock TEST Button: Locks the test button in the active position for continuous measurements — no need to hold the button during extended tests.
9. Auto Power-Off (10 Minutes): Switches off automatically after 10 minutes of inactivity, conserving battery charge during field work.
10. Overrange Indication: Displays an ‘OL’ symbol when the measured value exceeds the current range, preventing misreading of out-of-range values.
11. AC Voltage Measurement (30V–750V): Measures AC voltage in addition to insulation resistance without needing a separate multimeter.
12. CAT III 600V / Pollution Degree II Safety Rating: Meets IEC61010-1 double-insulation overvoltage safety standards for industrial useUNI-T UT502C Insulation Resistance Tester

Applications UNI-T UT502C Insulation Resistance Tester

• Insulation testing of power transformers, distribution transformers, and high-voltage wound components.
• Motor winding insulation verification before commissioning or after rewinding in manufacturing plants.
• Cable insulation resistance testing for low-voltage and medium-voltage power and control cables.
• Switch, contactor, and circuit breaker insulation verification during electrical panel maintenance.
• Household and commercial electrical appliance insulation safety inspection.
• Insulation testing in metallurgy, petroleum, chemical, and telecommunications industries.
• Preventive maintenance programs for power supply circuits and distribution boards.
• Pre-energization insulation checks during new electrical installation commissioning.
• Fault diagnosis and quality control inspection of insulation materials and components.

 

Who Uses This UNI-T UT502C Insulation Resistance Tester

• Electrical Maintenance Technicians: Perform routine insulation checks on motors, cables, and transformers to prevent equipment failure and downtime in factories and power plants.
• Electrical Contractors & Installers: Verify insulation integrity of new wiring and equipment before handing over completed electrical installations to clients.
• Power Plant Engineers: Test generator stator windings and high-voltage cable insulation resistance as part of planned maintenance schedules.
• Telecom & IT Infrastructure Teams: UNI-T UT502C Insulation Resistance Tester
  Test insulation of power feeds and UPS battery cables to maintain reliable uptime in data centers and telecom exchanges.
• Industrial Safety Officers: Conduct mandatory insulation safety audits on production machinery and switchgear to meet occupational safety requirements.
• Petroleum & Chemical Plant Technicians: Verify insulation on motors and cables in explosive or corrosive environments where insulation failure carries severe risk.
• Electrical Engineering Students & Training Institutes: Practice megger testing on laboratory equipment to learn insulation resistance measurement principles.

Frequently Asked Questions (FAQ) UNI-T UT502C Insulation Resistance Tester

Q1: What test voltages does the UNI-T UT502C Insulation Resistance Tester offer?

The UT502C offers four selectable test voltages: 250V, 500V, 1000V, and 2500V. You select the appropriate voltage using the rotary switch on the front panel. Choose the test voltage based on the rated voltage of the equipment you test — for example, 500V for standard motors and 2500V for medium-voltage cables and transformers.

Q2: What is the maximum insulation resistance the UT502C measures?

The UT502C measures insulation resistance up to 20GΩ at the 2500V test voltage setting. This range covers the insulation requirements of most transformers, motors, cables, and switchgear in industrial applications.

Q3: When does the buzzer alarm activate on the UT502C?

The buzzer alarm activates automatically when the measured insulation resistance value falls below 4MΩ. This alarm alerts the technician that the insulation under test is deteriorating and may present a risk of electrical breakdown or shock hazard.

Q4: Does the UT502C measure AC voltage?

Yes. The UT502C includes an AC voltage measurement function for voltages between 30V and 750V AC. Turn the rotary switch to the ACV position and connect the red lead to the ACV terminal and the black lead to the GUARD terminal to measure AC voltage.

Q5: How does the auto-range function work on the UT502C?

The auto-range function automatically selects the most appropriate measurement range within the selected test voltage category. You set the test voltage (250V / 500V / 1000V / 2500V) on the rotary switch, then press the TEST button — the meter automatically selects the correct range and displays the result in MΩ or GΩ without manual range adjustment.

Q6: How many batteries does the UT502C require?

The UT502C uses six 1.5V AA alkaline batteries. You can also power it using an optional external DC adapter (15V, 0.6A). The adapter does not charge the batteries — it only supplies operating power when connected.

Q7: What safety standards does the UT502C meet?

UNI-T designs and manufactures the UT502C to comply with IEC61010-1 safety requirements for electronic measuring apparatus. The tester carries a CAT III 600V rating with Pollution Degree II classification and features double-insulation overvoltage protection.

Q8: What types of electrical equipment can I test with the UT502C?

You can test the insulation resistance of transformers, electric motors, power cables, circuit breakers, contactors, switches, and general electrical appliances. The UT502C suits industries including power generation, manufacturing, petroleum, chemicals, metallurgy, and telecommunications.

Q9: Does the UT502C automatically power off?

Yes. The UT502C activates its auto power-off function after 10 minutes of inactivity. To restart the tester, turn the rotary switch from OFF back to the desired measurement position. This feature preserves battery charge during field inspections.

Why Buy from astzbd

• 100% Genuine Product: astzbd sources the UNI-T UT502C Insulation Resistance Tester from authorized distributors — every unit is original and carries full manufacturer warranty.
• Nationwide Fast Delivery: We deliver to Dhaka, Chittagong, Sylhet, Rajshahi, Khulna, Comilla, and all major districts across Bangladesh with quick dispatch.
• Expert Technical Support: Our team of electrical instrument specialists answers questions about insulation testing procedures, voltage selection, and equipment maintenance.
• Secure & Flexible Payment: Pay via bKash, Nagad, Rocket, credit/debit card, or bank transfer — all transactions use encrypted, secure payment processing.
• Hassle-Free Return Policy: We accept returns for damaged or defective units following our transparent customer protection policy — your investment stays protected.
• Best Price in Bangladesh: astzbd offers competitive pricing for the UNI-T UT502C with no hidden charges or surprise fees at checkout.
• Trusted by Professionals: Hundreds of electrical engineers, maintenance teams, and contractors across Bangladesh source their test and measurement instruments from astzbd for reliable, authentic products.