Fluke 1652C User Manual page 35

At this step, be careful not to select L-PE because a high current
loop test will take place. Any RCDs in the system will trip if you
proceed.
Connect the leads in a single-phase test to the system live and
neutral. To measure line-to-line impedance in a 3-phase system,
connect the leads to 2 phases.
7. Press and release . Wait for the test to complete.
The primary (upper) display shows the line impedance.
The secondary (lower) display shows the Prospective Short Circuit
Current (PSC).
8. If the mains is too noisy, Err 5 will be displayed. (The measured value
accuracy is degraded by the noise). Press the down arrow  to display
the measured value. Press the up arrow  to return to the Err 5
display.
Use the connection shown in Figure 15 when measuring in a 3-phase 500 V
system.
Figure 15. Measuring in a 3-Phase System
Warning

Note
N (L3/Blue)
Electrical Installation Tester
Making Measurements
L (L1/Red)
L1
L2
L3
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