COMBI521
EN - 80
6.10. LEAK: LEAKAGE CURRENT MEASUREMENT
This function allows measuring leakage current by means of an external clamp (optional
accessory HT96U) or measuring AC TRMS current by using other transducers connected
to input
In1
.
Fig. 33: Indirect measurement of leakage current in three-phase systems
Fig. 34: 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
shows a screen similar to the one on the side. It shows:
MAX
maximum value of current detected during
the whole measuring time
Current measured in real time
Date/time of the maximum current value detected
while measuring
LEAK
15/10 – 18:04
M A X = - - - m A
- - - m A
- -/ - -/ -
-
- - | - -
| - -
1A
30mA
FS
Lim.
2. Use the arrow keys
,
to select the parameter to be modified, and keys
,
to
change the parameter's value
:
FS
This key allows setting the full scale of the clamp transducer connected to
input
In1
.
The following values can be selected
:
1A, 5A, 10A, 30A, 40A, 100A,
200A, 300A, 400A, 1000A, 2000A, 3000A
Lim
This key allows selecting the limit threshold for the measurement of the
maximum value of current according to the used clamp's FS, which also defines its
resolution, to be considered positive
.
3. Connect the external clamp to the instrument's input In1
4. For indirect measurements of leakage current, connect the external clamp according to
Fig. 33. For direct measurements of leakage current, connect the external clamp
according to Fig. 34 and disconnect possible additional earth connections which could
influence the test results.
