Uni-T UT502A Insulation Resistance Tester

Uni-T UT502A Insulation Resistance Tester


An excellent insulation resistance tester used for insulation resistance measurement for insulation materials and various kinds of electric equipment such as transformer, electric machines, cables, switches, electrical appliance, an ideal tool for electric maintenance, testing, and inspection.

UT500 series insulation testers are used to measure the insulation resistance of electrical equipment and household appliances. This is done by measuring the insulation resistance between electrical circuits or between circuits and ground. UT500 series can measure insulation resistance, AC Voltage, low resistance, PI (Polarization Index) and DAR (Dielectric Absorption). These are ideal tools for ensuring transformers, generators, high voltage motors, power capacitors, power cables, arresters and other electrical equipment that can operate in a safe and accurate manner.


  • PI and DAR measurement, auto resistivity calculation
  • 500-2500V
  • 2000 count LCD display
  • Overload indication
  • LCD Backlight
  • AC voltage measurement
  • Alarm Light Display
  • Alarm Buzzer
  • High Voltage Indication
  • Auto power off
  • Auto discharge
  • Continuous measurements mode, red warning light, and buzzer function
  • Test Voltage Vice Display
  • Automatic measurement
  • Low Battery Indication
  • 10MΩ internal resistance test
  • Auto Discharge
  • Continuous low resistance measurement
  • Low resistance returning to zero function to improve accuracy.

1 x UT502a, 1 x Batteries, 1 x Test Leads, 1 x carry case, 1 x set alligator clips, 1 x gallus, 1 x temp probe, 1 x English user manual and 12-month warranty.


Specifications   Range UT501A UT501B UT502A
Insulation resistance (Ω) Test voltages 100V/250V/500V/1000V 0%~10%    
250V/500V/1000V   0%~10%  
500V/1000V/2500V     0%~10%
100V 0MΩ~100MΩ ±(3%+5)    
250V 0MΩ~99.9MΩ ±(3%+5) ±(3%+5)  
100MΩ~5GΩ ±(5%+5) ±(5%+5)  
500V 0MΩ~99.9MΩ ±(3%+5) ±(3%+5) ±(3%+5)
100MΩ~5GΩ ±(5%+5) ±(5%+5) ±(5%+5)
1000V 0MΩ~99.9MΩ ±(3%+5) ±(3%+5) ±(3%+5)
100MΩ~5GΩ ±(5%+5) ±(5%+5) ±(5%+5)
2500V 0MΩ~99.9MΩ     ±(3%+5)
100MΩ~9.9GΩ     ±(5%+5)
10GΩ~20GΩ     ±(10%+5)
Load current 50V (R=50kΩ) 1mA 0%~10% 0%~10% 0%~10%
100V (R=100kΩ) 1mA 0%~10% 0%~10% 0%~10%
250V (R=250kΩ) 1mA 0%~10% 0%~10% 0%~10%
500V (R=500kΩ) 1mA 0%~10% 0%~10% 0%~10%
1000V (R=1MΩ) 1mA 0%~10% 0%~10% 0%~10%
2500V (R=1MΩ) 1mA     0%~10%
Short-circuit current   <2mA <2mA <2mA
Low resistance (Ω) 0.01Ω~200Ω (about 5.0V/>200mA)   ±(2%+3) ±(2%+3)
AC voltage (V) 30V~750V ±(2%+3)    
30V~600V   ±(2%+3) ±(2%+3)
Display count   2000 2000 2000
DAR 60s/15s and 60s/30s  
Auto range/Low battery indication  
LCD backlight/Light alarm  
Buzzer alarm/High voltage indication  
Overload indication/Auto discharge  
Test voltage secondary display  
10MΩ internal resistance test  
Meets IEC 61557 61557-1:2007; 61557-2:2007; 61557-4:2007 (UT502A only)
General Characteristics
Power 1.5V battery (LR6) x 6
Display 70.6mm x 34mm
Product colour Red and grey
Product net weight 500g
Product size 150mm x 100mm x 71mm
Standard accessories Batteries, test leads, alligator clips, gallus, test probes (UT502A)

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