HT instruments SPEED418 - Manual (Page 56)

400 Series
EN - 55
7.2. LEAK: REAL TIME MEASUREMENT OF THE LEAKAGE CURRENT
THROUGH AN EXTERNAL CLAMP
Using an external clamp, this function allows measuring the leakage current.
Fig. 30: Indirect measurement of leakage current in three-phase systems
Fig. 31: Direct measurement of leakage current in three-phase systems
1. Press the MENU key, move the cursor to
LEAK
in the main menu by means of the arrow
keys (,) and confirm with ENTER.
Subsequently the instrument measures in real
time and displays, in a screen similar to the
one reported here to the side, the instant value
of the input parameter, and RUN appears on
the right bottom part of the display
L E A K
I = 0 0 . 0 A
I m a x = 0 0 . 0 A
100A RUN
FS
2. Use the arrow keys ,  to select the clamp full scale among the values:
1A, 10A, 30A, 100A, 200A, 300A, 400A, 1000A, 2000A, 3000A
. the
changes made to the FS value will also be applied to the PWR function (§
8.1). It is not necessary to confirm the selection with ENTER.
3. The FS set on the instrument has always to match the one on the clamp being used.
For the leakage current, the instrument and the clamp are generally set to FS=1A
4. Insert the clamp connector into the instrument input In1
5. For indirect measurements of the leakage current, connect the external clamp
according to Fig. 30. For direct measurements of the leakage current, connect the
external clamp according to Fig. 31 and disconnect possible additional earth
connections which could influence the test results