3.3 Test inhibit
Each test mode has conditions under which testing will be inhibited, as below:
3.3.1. Insulation
Detection of a circuit voltage above 50 V (a warning is displayed at 25 V)
3.3.2. Continuity
Detection of a circuit voltage above that used by the instrument will inhibit testing
3.3.3. Earth loop impedance
Touch voltage exceeds 50 V (or 25 V depending on instrument configuration)
Supply voltage over range or under range
Supply frequency out of specification
3.3.4. RCD/GFCI testing
Touch voltage detected or predicted to exceed 50 V (or 25 V depending on instrument configuration)
Supply voltage over range or under range
Supply Frequency out of specification
3.3.5. Earth testing
External voltage greater than 25 V present
Leads not connected as per the test requirements
Potential stake not within range (Rp)
Current stake not within range (Rc)
Other conditions that will inhibit testing include:
3.3.6. Battery exhausted
All testing will be inhibited in the event of a flat battery, refer to “2.1.5. Battery and fuse location, fitting and
replacement” on page 13.
www.megger.com MFT1800 series
17
Operation
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