Test Instrument Reference

Data record instr.insulation-resistance-tester.guard-terminal

Verified 2026-10-27 Confidence: High

The guard terminal of an insulation resistance tester is connected, usually through a bare wire wrapped tightly around the surface of the test object, so that surface leakage current bypasses the measuring circuit and the reading reflects the insulation itself rather than dirt or moisture on its surface; a reading taken with and without the guard shows whether an insulator only needs cleaning.

ProvenanceMegger Electrical Tester article supports data record instr.insulation-resistance-tester.guard-terminal, which is cited on the entry Insulation resistance tester.SOURCEMegger Electrical Tester articleMegger Electrical Tester..Manufacturer pageDATA RECORDinstr.insulation-resistance-tester.guard-terminalinstr.insulation-resista..Verified 2026-10-27ENTRYInsulation resistance testerInsulation resistance te..1 revision
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StepItemDetail
SourceMegger Electrical Tester articleManufacturer page
Data recordinstr.insulation-resistance-tester.guard-terminalVerified 2026-10-27
EntryInsulation resistance tester1 revision
Subject
Insulation resistance tester (Instrument classes)
Kind
Instrument fact
Source
Megger Electrical Tester article, January 2015 edition, Seven Tips for Insulation Resistance Testing, Megger. Publisher page

History

Every recorded change to this data record, oldest first.
DateChange
2026-10-27created
2026-10-27review_status unreviewed -> software_reviewed

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"Data record instr.insulation-resistance-tester.guard-terminal." Test Instrument Reference. 2026-10-27. https://www.testinstrumentreference.com/data/instr.insulation-resistance-tester.guard-terminal/.