Operation manual ISOTEST 4 S / 4 S
p l u s
Page 35
Additional information
Below, please find a list of terms with explanations that allows
better understanding of the operation of the ISOTEST
®
test
equipment
1. Definitions of terms
Terms
Explanations
Test object
The object that is to be subject to testing.
Voids
Pinholes or connects in the material to be tested.
During tests, voids are indicated by an acoustic and
a visual (red LED on the membrane-switch front
panel) alarm.
Testing electrodes
Electrically conductive spiral or fan brushes
applying the test voltage to the test object.
Capacitive load
The capacitive load depends on the type and
thickness of the coating as well as on the contact
area of the testing electrode. Thin coatings and
large contact areas result in high capacitive load.
Whenever the maximum allowable capacitive load
is exceeded, the LED on the membrane-switch front
panel illuminates yellow.
Ground potential
The reference potential for testing.
Ground potential is available through:
-
all parts of a building electrically connected to
foundation ground
-
all building parts electrically connected to the
potential compensation bus
-
PE power line conductor
-
Separate grounding stick (part number
0174200000)
Low-resistance
Contact resistance of less than 10 Ohm.
Prerequisite:
-
Contact surfaces should be free from
contamination and stain
-
Short grounding cable (length of less than 15 m)
-
Cable a cross-section equal to or greater than
2.5 mm
2
