{{unref, date=April 2012
A multifunction tester or MFT is an electronic device used by electricians to test electrical circuits that use the "
low
Low or LOW or lows, may refer to:
People
* Low (surname), listing people surnamed Low
Places
* Low, Quebec, Canada
* Low, Utah, United States
* Lo Wu station (MTR code LOW), Hong Kong; a rail station
* Salzburg Airport (ICAO airport code: LO ...
" and "
extra-low voltage
Extra-low voltage (ELV) is an electricity supply voltage and is a part of the Low voltage bandIEC 61140:2016 Chapter 4.2 in a range which carries a low risk of dangerous electrical shock. There are various standards that define extra-low voltage. ...
s" typically used by consumers in domestic, commercial and agricultural settings.
Multifunction testers are able to perform continuity tests (or low ohms resistance tests) and insulation resistance tests (or high ohms resistance tests) and they may also be able to perform
earth fault loop impedance tests,
prospective short-circuit current
The prospective short-circuit current (PSCC), available fault current, or short-circuit making current is the highest electric current which can exist in a particular electrical system under short-circuit conditions. It is determined by the voltag ...
tests,
earth electrode tests and
RCD tests.
Electrical circuits