16
W
Warning
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.
Note:
Connect the leads in a single-phase test to the system line 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 10 when measuring in a 3-phase 500 V system.
L1
L2
L3
L (L1/Red)
N (L3/Blue)
Figure 10. Measuring in a 3-Phase System
Measuring RCD Tripping Time
Figure 11. RCD Tripping Time Display/Switch and Terminal Settings
In this test, a calibrated fault current is induced into the circuit, causing the RCD to trip. The
meter measures and displays the time required for the RCD to trip. You can perform this test
with test leads or using the mains cord. The test is performed with a live circuit.
You can also use the tester to perform the RCD tripping time test in Auto mode, which
makes it easier for one person to perform the test. If the RCD has a special nominal current
setting other than the standard options, 10, 30, 100, 300, 500 1000 mA, you can use a
custom setting with the VAR mode.
Note:
When measuring trip time for any type of RCD, the tester first does a pretest to
determine if the actual test will cause a fault voltage exceeding the limit (25 or 50 V).
To avoid having an inaccurate trip time for S type (time delay) RCDs, a 30 second delay is
activated between the pretest and the actual test. This RCD type needs a delay because it
contains RC circuits that are required to settle before applying the full test.
