Insulation Resistance Testers Selection Guide: Technical Criteria & Application Standards
Insulation Resistance Testers selection guide: technical parameters, mounting and compliance standards, and Unit comparison.
An insulation resistance tester, also known as a megohmmeter or megger, is a device that measures insulation resistance at the MΩ and GΩ level by applying a DC test voltage between conductors or between a conductor and earth. It is used to find out whether the insulation of cables, motors, transformers and panels is sound before commissioning and during periodic maintenance, and whether it is weakening because of moisture or aging. This category includes Unit models; the product data states test voltages such as 250 V, 500 V, 1000 V, 2500 V and 5000 V, PI and DAR tests, AC and DC voltage measurement, and battery or lithium battery power. Choose a device by test voltage steps appropriate to the rated voltage of the equipment you will test, the highest resistance it can measure, the PI and DAR tests, the short-circuit current and the supply type. PI is the ratio of the resistance at the tenth minute to the resistance at the first minute; DAR is the ratio of the value at 60 seconds to the value at 15 or 30 seconds. The resistance range of a multimeter measures with a low voltage and therefore does not replace an insulation resistance tester. The Insulation Resistance Testers category on Welibaba includes 17 active models from leading manufacturers such as Unit.
Key Technical Parameters for Selecting Insulation Resistance Testers
To specify the right Insulation Resistance Testers model for your panel or installation, verify the following parameters against your engineering schedule:
| Parameter | Typical Catalog Values | Verification Note |
|---|---|---|
| AC Voltage Measurement | 0V~600V (doğruluk: ±(1.5%+5)), 0V~600V (doğruluk: ±(2%+3)), 30 V – 600 V · ±(%2+3), 30 V – 750 V · ±(%2+3) | Verify against project schedule and load calculation |
| Power Source | 1.5V alkalin pil (LR14) X 10, güç adaptörü, 1.5V pil (LR6) x 6, 11.1V/2600mAh lityum pil | Verify against project schedule and load calculation |
| Gram | 1.2 kg, 1.8 kg, 2 kg, 500 g | Verify against project schedule and load calculation |
| DAR Test | 0.00~999, 60s/15s ve 60s/30s, Var, otomatik gösterim | Verify against project schedule and load calculation |
Installation, Compatibility, and Commissioning Checklist
- Electrical & Mechanical Matching: Confirm that rated voltage, current capacity, and mounting dimensions align with the upstream and downstream components in Electrical and Electronic Testers.
- Environmental & Enclosure Rating: Check IP protection class, housing material, and terminal capacity for dusty, humid, or high-vibration industrial environments.
- Related Product Groups: If your application calls for a different form factor or rating, compare sibling categories such as Voltage and Continuity Testers, Cable Testers and Tracers, Fiber Optic Testers.
Frequently Asked Questions
What is the first parameter to check when selecting Insulation Resistance Testers?
Start by confirming the circuit's rated electrical values and physical mounting dimensions, then use the technical attribute filters on the Insulation Resistance Testers page to narrow down compatible series.
Which Insulation Resistance Testers brands are available on Welibaba?
Welibaba currently stocks 17 active models in this category from manufacturers including Unit, complete with verified specifications and unit pricing.
How can I compare Insulation Resistance Testers models by manufacturer part number?
You can search directly by manufacturer SKU/order code or use the category filter panel to compare equivalent models across brands side by side.