Operation manual ISOTEST 4 S / 4 S
p l u s
Page 37
Ground connection
monitoring
If the grounding plug is not connected to the
grounding jack of the ISOTEST
®
test equipment,
this will be detected electronically and indicated by
an acoustic alarm as well as the LED on the
membrane-switch front panel that will alternately
flash yellow and green. The test voltage cannot be
enabled.
Turn-off reminder
Automatic partial shut-off if the unit was not turned
off within 5 minutes after the last depression of the
safety button. Partial shut-off is indicated by short
flashing of the LED on the membrane-switch front
panel in green and an acoustic alarm.
If the unit should be used again, it must be powered
off and on again.
Load adjustment
To achieve a maximum operating time per battery
charge, the ISOTEST
®
holiday detectors work with
a load-dependent processor-controlled energy
control. By a continuous monitoring of the applied
load, the energy content of the test voltage is
regulated to a value that guarantees a reliable
signal when detecting a pore / void. The energy
control is reflected in the fact that the audible
flashover of the internal spark gap softens under a
lower load. Depending on the load, the intensity of
the spark varies in its degree in the event of a pore /
void. The energy control has no effect on the level
of the set test voltage.
Overload
If the yellow flashing of the LED indicates an unsafe
load on the ISOTEST
®
holiday detector, it is no
longer guaranteed that the chosen test voltage is
applied on the test object. The user has to decide
whether the level of the applied test voltage is
sufficient for a reliable signal in the event of a pore /
void. For the evaluation a sample pore could be
helpful. Measures to reduce the load, see checklist
„Error messages and troubleshooting“
LED
is an abbreviation of "Light-Emitting Diode" (a small
electronic indicator light on the membrane-switch
front panel). Current operating conditions and error
messages are indicated by the LED being lit in
various colors.
