Insulation Testers

Insulation testers help electrical maintenance and testing professionals evaluate insulation resistance in electrical equipment, circuits, and systems. Depending on the model, they can support routine troubleshooting, continuity and AC/DC voltage checks, high-voltage insulation testing, breakdown testing, and documented measurement records.

Product Display:
Helpful Buying Guide

How to Choose an Insulation Tester

Start with the electrical tests you need to perform, then compare available test-voltage options, insulation-resistance capacity, diagnostic functions, data handling, and features that support your working environment.

Visual Guide

Popular examples in this category

10 kV Insulation Resistance Tester with Measurement Storage and PC Interface10 kV Insulation Resistance Tester with Measurement Storage and PC InterfaceWBM15019675 kV Insulation Resistance Tester with Measurement Storage and PC Interface5 kV Insulation Resistance Tester with Measurement Storage and PC InterfaceWBM1501965Autoranging Digital Insulation Resistance TesterAutoranging Digital Insulation Resistance TesterWBB1410692Digital High-Voltage Insulation Tester, GrayDigital High-Voltage Insulation Tester, GrayWBB1642007
Use Cases

Match the tester to the work

Use digital insulation testers for routine insulation-resistance checks and troubleshooting. Higher-voltage models are intended for insulation assessment work where 10 kV testing, breakdown testing, or high-resistance measurement capacity is needed.

How to Choose

Compare voltage and measurement needs

Select a tester with the DC test-voltage choices needed for the job. Represented options include 250 V, 500 V, and 1000 V settings, as well as selectable high-voltage testing up to 10 kV.

Applications

Support electrical maintenance testing

These testers are designed to evaluate insulation resistance in electrical equipment, circuits, and systems. Some models also add continuity and AC/DC voltage measurement functions for broader routine testing.

Additional Information

Consider records and diagnostic tools

For documented testing, compare models with up to 99 stored measurements and PC interfaces. DAR and PI calculations can support insulation-condition analysis, while ramp testing supports controlled-voltage breakdown testing.

10 kVHighest stated test capability

High-voltage testing capability represented on selected insulation testers.

2 TΩHighest stated resistance measurement

Measurement capacity stated for one 10 kV tester.

99Stored measurements

Storage capacity available on selected models for later reference.

250 V–1000 VRoutine selectable DC settings

Selectable DC test voltages available on one digital insulation tester.

Comparison Guide

Compare Insulation Tester Types

Use this overview to narrow the selection based on the capabilities described for the represented products.

Tester TypeRepresented CapabilitiesSelection Considerations
Routine digital insulation testerSelectable 250 V, 500 V, and 1000 V DC tests; autoranging to 2000 MΩ; continuity and AC/DC voltage measurementChoose for routine testing and troubleshooting when additional measurement functions are useful.
High-voltage tester10 kV testing; high insulation-resistance measurement capacity; selected models include DAR, PI, ramp testing, storage, and PC interfaceChoose when high-voltage insulation assessment, diagnostic values, breakdown testing, or documented results are required.
Stored-data 5 kV or 10 kV testerUp to 99 stored measurements and PC interface; selected models include DAR, PI, and ramp testingChoose when test records need to be retained, transferred, and organized.
Planning Guide

Plan the right fit before choosing

Choose Test Capability

Start with required test voltage and resistance range

The available testers range from routine digital models with selectable 250 V, 500 V, and 1000 V DC test voltages to high-voltage models with selectable testing up to 10 kV. For high-resistance work, compare the stated measurement capacity of the tester.

  • Autoranging routine testing is available up to 2000 MΩ on one digital model.
  • A high-voltage tester is described with a 500 Gohm insulation-resistance range.
  • One 10 kV model measures resistance to 2 TΩ.
  • Selectable voltage steps are available from 250 V to 1,000 V in 50 V steps and above 1,000 V in 100 V steps on one model.
Plan Documentation and Analysis

Choose functions that fit your testing process

If results must be reviewed or organized later, choose a model with onboard storage and PC interfacing. Several represented testers store up to 99 measurements. Automatic DAR and PI calculations are available on selected models for insulation-condition evaluation.

  • Measurement storage supports later review and recordkeeping.
  • PC connectivity helps transfer and organize recorded test information.
  • DAR and PI values are automatically calculated on selected models.
  • Timed test functions are available on a 10 kV tester with a hard case.
Review Added Functions

Compare troubleshooting, display, and test features

Some insulation testers combine insulation testing with other electrical measurement capabilities. Other features can help with reading results, managing a test cycle, or conducting breakdown testing.

  • One digital model measures low-resistance continuity and AC/DC voltage in addition to insulation resistance.
  • A backlit dual display can show test-voltage output and insulation resistance at the same time.
  • Automatic discharge is available at the end of a test on one model.
  • Ramp testing functions support controlled-voltage breakdown testing on selected models.
FAQ

Common questions before buying

What does an insulation tester measure?

An insulation tester evaluates insulation resistance. Some represented digital models also measure continuity and AC/DC voltage.

What test voltages are available?

Available options include selectable 250 V, 500 V, and 1000 V DC settings, along with high-voltage testing capabilities up to 10 kV on selected models.

Which testers can store results?

Selected 5 kV and 10 kV insulation resistance testers store up to 99 measurements and include a PC interface for organizing test data.

What are DAR and PI calculations?

DAR and PI are automatically calculated diagnostic values available on selected testers to support insulation-condition analysis.

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