Megger MFT-X1 - Loop Impedance Settings; Allow Reverse Polarity; Maximum Touch Voltage; AUTO Test Start

15.8 Loop impedance settings
1. Select the Loop Impedance page from the set-up page.
2. Turn the right-hand knob to highlight the setting you want to change.
The options are
 Allow reverse polarity
 Max touch voltage
 Auto-test start
15.8.1 Allow reverse polarity
This mode allows a Loop Impedance test to either prevent or allow a Loop Impedance test when it detects a reversed
phase and neutral condition.
If this option is on, the instrument will allow Loop Impedance tests to continue even if it detects that the live and
neutral connections are reversed, but it will still provide a warning. If this option is off, the instrument will inhibit
Loop Impedance tests if it detects that the live and neutral connections are reversed.
1. Select the allow reverse polarity option using the right-hand range knob.
2. Press Hot key 3 to change the behavior on detecting a reverse L-N connection from allowed ON to allowed OFF.
The MFT will state the change will also apply to the Loop Impedance testing. Press green check button (Hot key
4) to accept or red cross (Hot key 2) to decline.
3. Your choice is stored automatically.
15.8.2 Maximum touch voltage
1. Select the maximum touch voltage option using the right-hand range knob.
2. Press Hot key 3 to change the maximum touch voltage from 50 V to 25 V and back.
3. The instrument will ask if you also want this change to apply to the RCD testing also.
4. Press the green check button (Hot key 5) to accept or the red cross button (Hot key 2) to prevent the change also
affecting RCD testing mode.
15.8.3 AUTO test start
If this option is on, the operator can press the TEST button to “prime” the auto test mode.
Once the test is primed, the test will start as soon as you connect the test-leads to the live circuit under test. If this
option is off, you will need to press the test button to start a Loop Impedance test after connecting the test-leads to a
live circuit.
1. Select the AUTO Start Test option on the right-hand range knob.
2. Press Hot key 3 to turn AUTO test start on or off.
3. Your choice is stored automatically.
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