UNI-T UT501A Insulation Resistance Tester
The UNI-T UT501A is a benchtop/handheld style insulation resistance tester designed to assess the integrity of insulation in electrical systems. It combines digital circuits with classic measurement functions to offer reliable performance under various working conditions. The tester includes multiple test voltage settings, allowing the user to apply insulation test voltages from low to high (100V up to 1000V DC), depending on the sensitivity required. A rotary dial selects the test voltage or switches to AC voltage mode, while a large “TEST” button initiates insulation resistance measurement. The device is built with sturdiness in mind for field or workshop usage.
Its interface features a sizable LCD display with backlight, making readings legible even in dim or poorly lit environments. Visual cues accompany the higher test voltages a red warning light is activated when high voltage is output ensuring the user is aware of potentially dangerous conditions. The unit also offers data-hold functionality, allowing freeze of readings for easier recording or inspection. Overload and low-battery alerts are part of its design, enhancing safety and user awareness. There is also an automatic discharge function, which safely bleeds off test voltage after measurement, reducing risk.
In terms of form, the UT501A is sizable: its chassis is relatively large with grip friendly size, and it is designed to tolerate field usage. The tester runs off six 1.5V alkaline batteries, giving it portability, though it is somewhat heavy with the battery installed. The knob and jacks are clearly marked (ACV, insulation ranges, etc.), facilitating straightforward operation by electricians or maintenance personnel. Overall, the UT501A aims to deliver insulation resistance testing with a mix of safety, versatility, and ease of reading, suited for electrical inspection or preventive maintenance.
Features:
- 2000 count LCD display, overload indication, backlight
- AC voltage measurement, auto power off
- Auto discharge
- Continuous low resistance measurement
- Continuous measurements mode, red warning light and buzzer function
- PI and DAR measurement, auto resistivity calculation
- Low resistance returning to zero function to improve accuracy
Specifications:
| Specifications | Range | UT501A | |
| Insulation resistance (Ω) | Test voltages | 100V/250V/500V/1000V | 0%~10% |
| 100V | 0MΩ~100MΩ | ±(3%+5) | |
| 250V | 0MΩ~99.9MΩ | ±(3%+5) | |
| 100MΩ~5GΩ | ±(5%+5) | ||
| 500V | 0MΩ~99.9MΩ | ±(3%+5) | |
| 100MΩ~5GΩ | ±(5%+5) | ||
| 1000V | 0MΩ~99.9MΩ | ±(3%+5) | |
| 100MΩ~5GΩ | ±(5%+5) | ||
| Load current | 50V (R=50kΩ) 1mA | 0%~10% | |
| 100V (R=100kΩ) 1mA | 0%~10% | ||
| 250V (R=250kΩ) 1mA | 0%~10% | ||
| 500V (R=500kΩ) 1mA | 0%~10% | ||
| 1000V (R=1MΩ) 1mA | 0%~10% | ||
| Short-circuit current | <2mA | ||
| AC voltage (V) | 30V~750V | ±(2%+3) | |
| Features | |||
| Display count | 2000 | ||
| Auto range/Low battery indication | √ | ||
| LCD backlight/Light alarm | √ | ||
| Buzzer alarm/High voltage indication | √ | ||
| Over load indication/Auto discharge | √ | ||
| Test voltage secondary display | √ | ||
| 10MΩ internal resistance test | √ | ||
| General Characteristics | |||
| Power | 1.5V battery (LR6) x 6 | ||
| Display | 70.6mm x 34mm | ||
| Product color | Red and grey | ||
| Product net weight | 500g | ||
| Product size | 150mm x 100mm x 71mm | ||
Applications:
- Transformer insulation testing.
- Motor winding insulation assessments.
- Cable insulation diagnostics.
- Switchgear and electrical equipment maintenance.
- Household appliance insulation inspection.
Package Contents:
- 1x Insulation Resistance Tester UT501A
- 1x Test leads
- 1x Alligator clips
- 1x Instruction manual
- 1x Carrying case (or bag)
- 1x Gallus / strap / neck strap
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