.3 Connect the test leads to the Phase (L1) and Earth (L2) or Phase (L1) and Neutral (L3) terminals on the tester
depending on the selection in (.1) above.
.4 Connect the test leads to the Phase and Earth conductors or Phase and Neutral conductors as required. If using the
mains plug test lead connect to the first supply outlet.
.5 Press the TEST button. The loop impedance will be displayed in the large readout and the small readout.
.6 Move to the 2nd socket to be tested and make another loop test. If the result is less than the first the large readout
will show the new value but the small readout will remain unchanged. If the new value is higher, the small readout
will be updated accordingly, as below:
2nd result lower than 1st result 2nd result higher than first result
.7 Repeat the loop impedance test at each of the remaining sockets. At the conclusion of testing simply read off the
Zmax value from the upper display readout.
This value is retained until the instrument is switched off (or automatically switches off)
7.7 Making an R1+R2 Loop impedance measurement (MFT1720 and MFT1730 only)
The R1+R2 mode requires a reference measurement to be made, typically Ze or Zdb. This is then automatically subtracted from
the circuit loop impedance when measurements are made in the R1+R2 mode.
.1 Set the RIGHT rotary range knob to the
range.
.2 Make a loop measurement using either the Phase to Neutral or Phase to Earth methods above. This value is
automatically stored as the reference value. This can repeated if necessary.
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