Test Instrument Reference

Data record gloss.guard-terminal.usage

Verified 2026-10-27 Confidence: High

A maker's article on insulation testing describes the guard terminal as a third connection to the asset under test that provides a return path for surface leakage current, so that the instrument measures only the leakage current through the insulating material rather than the sum of the two. It notes that a test made with the guard and one made without it, when the readings differ greatly, show that surface contamination rather than degradation of the insulation is the cause of a low reading.

ProvenanceMegger Electrical Tester article supports data record gloss.guard-terminal.usage, which is cited on the entry Guard terminal.SOURCEMegger Electrical Tester articleMegger Electrical Tester..Manufacturer pageDATA RECORDgloss.guard-terminal.usagegloss.guard-terminal.usageVerified 2026-10-27ENTRYGuard terminalGuard terminalNo revisions
Provenance. Where this record comes from and where it is used: the cited source, the record itself and the entry that cites it.
Provenance: the chain from source to entry.
StepItemDetail
SourceMegger Electrical Tester articleManufacturer page
Data recordgloss.guard-terminal.usageVerified 2026-10-27
EntryGuard terminalNo revisions
Subject
Guard terminal (Glossary)
Kind
Definition
Source
Megger Electrical Tester article, Electrical Tester, 1 April 2019 edition, The importance of the guard terminal in insulation 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 gloss.guard-terminal.usage." Test Instrument Reference. 2026-10-27. https://www.testinstrumentreference.com/data/gloss.guard-terminal.usage/.