DWR (Dielectric Withstand Resistance)
What does DWR mean?
DWR (Dielectric Withstand Resistance) is a safety-relevant high-voltage test used to evaluate the insulation strength of assemblies, cables, transformers, power supplies, and much more.
A test-defined high voltage (typically a few hundred volts up to several kilovolts AC/DC) is applied between two conductive points (e.g., primary–secondary, conductor–protective earth, conductor–chassis).
During a dwell/soak time, the tester monitors leakage current and, if required, any arc/breakdown events.
If a limit value (trip current) is exceeded or an arc is detected, the device under test is deemed to have failed.
The DWR/HiPot test is an integral part of many safety standards and production end tests.
Modern instruments offer ramp/discharge, soft shutdown, automation via SCPI/LabVIEW, and sequences together with insulation resistance and protective earth testing.
Result:
- Proof of electrical safety
- Avoidance of latent insulation faults and reproducible quality in production and service.