Operation manual ISOTEST 4 S / 4 S
p l u s
Page 31
Error message:
No acoustic signal after pressing the safety button
Possible Causes
Remedy
The unit is not turned
on
Turn the unit on
Automatic shut-off for
energy savings was
enabled
●↔○
The LED flashes green
over a short period of time
The unit must be turned on again
Low voltage of the
battery in the handle
Replace the battery
(refer to Chapter "Replacing The Lithium
Battery")
Error message:
Acoustic signal approx. 3 seconds after pressing the
safety button without contacting the test object with the electrode
Error Message
Possible Causes
Remedy
●↔○
The LED flashes green
Low battery charge
Replace or charge the
rechargeable battery
●↔○
The LED flashes red
(safety shut-off)
The safety mode is
enabled
Press the safety button
to exceed the first
trigger point,
or select the standard
mode for the safety
button.
●↔○
The LED flashes red
(safety shut-off)
Readjusting the
magnitude of the test
voltage with the safety
button depressed
Release the safety
button After calibrating
to the newly adjusted
voltage, the LED
illuminates green and
the unit is ready for use.
