14
Circuit connection:
The MFT is designed to test the L-PE and the L-N (and L-L) part of the circuit. Selecting the L-PE range on the MFT will enable testing of
the Live to Earth circuit as below:
7.1 Range selection and test leads
7.1.1 Phase to earth L-E circuits:
The main range knob and test leads should be connected as shown:
On the MFT1720 and 1730 the right hand knob should be set to “Z”
Connecting the 3rd (Blue) lead enables the “3 wire loop test 3Lo, as below and “reverse polarity detection”.
Test Options in L-PE mode:
In L-PE mode the MFT1700 series offer 3 types of loop test:
3Lo – A 3-wire low current loop impedance test. This test requires all three connections.
Where to use:
For making L-E measurements on circuits where all three conductors are available AND the Phase – Earth circuit is RCD
protected.
REQUIRES ALL THREE TEST LEADS TO BE CONNECTED
2Hi – A 2-wire high current test. A fast 3-4 second test using high test currents.
Where to use:
On ALL circuits except Phase – Earth measurements on RCD protected circuits.
2Lo – A 2-Wire low current loop test for L-E measurements where the 3rd conductor in not available.
Where to use:
On RCD protected circuits where access to all three conductors is not possible
Note: 2Lo is not available when all three leads are connected, as the 3Lo is the preferred measurement mode.
Selecting the test mode:
To switch between Loop test modes press the Function <-> button, as below:
To Next Page
Loading...
Need help?
General
