5.5 Switch probe (SP5)
In the CONTINUITY/RESISTANCE mode all measurements can be made with the remote switch probe (SP5). Tests are
automatic and do not require the TEST button to be pressed.
1. Connect the switch probe to the switch probe socket L1 (+ve). The switch probe replaces the standard RED test
lead. Test as in “5.2 Making a CONTINUITY measurement” on page 22.
5.6 Buzzer threshold
If the measured resistance is less than the buzzer threshold, the buzzer will sound. The resistance at which the buzzer
stops sounding can be changed to meet individual test requirements. See “11. Setup options” on page 53.
Selectable limits of 0.5 Ω, 1 Ω, 2 Ω, 5 Ω, 10 Ω, 20 Ω, 50 Ω, 100 Ω, (depending on model) are available.
This setting is stored even when the instrument is switched off.
5.7 Measurement methods and sources of error
Method of measurement
The 2-wire lead set must be used for this measurement. A DC voltage of nominally 4.4 V with a current limit
of >200 mA is used to measure resistance less than 2 Ω.
Possible sources of error
Measurement results can be affected by the following:
The presence of circuits connected in parallel.
Presence of AC voltages on the circuit being measured
A poor connection to the circuit under test
Incorrectly nulled test leads
Use of fused leads
www.megger.com MFT1800 series
23
Continuity / resistance measurement
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