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A few examples will be given to illustrate whether or not detection is reliable.
Example 1:
A small treated object placed on an insulating table, and connected to the
ground terminal by a short cable. Once the sponge makes contact with the
object, the earth will be detected. Once the sponge disconnects, nothing will be
detected. In this case, the earth detection will work exactly as intended.
Example 2:
The earth clamp is connected to a (large) chassis of a vehicle which is isolated
from the floor . The ground cable is (partially) on sheet metal of the chassis.
Once the sponge makes contact with the object earth will be detected. If the
clamp comes loose, a signal might still be detected through the cable, and the
detection is not 100% reliable.
Example 3:
The earth clamp is connected to an object that is embedded in a concrete floor
and the long cable is on this floor. In this case, it may be that the earth
detection already detects earth after switching on the device. In this case, the
earth detection is NOT reliable, and extra attention should be paid whether or
not the earth clamp is still connected properly.
WARNING: Risk of electric shock
The TQC Low Voltage Pinhole Detector
(possibly) uses tensions that may cause
a mild electric shock. The earth clamp
detection will switch off the voltage of the
device once it is removed from the
substrate, yet the risk of electric shock
remains, particularly if the device isn’t
used properly. It is strongly recommended
at all times to hold the device UNDER the
button and avoid each contact with the
top plate (the live part) The use of gloves is also recommended.
DANGER
People with for instance a pacemaker or heart problems should completely avoid the
use of this device.
EN