Operating Manual
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CHALLENGER-35
· Operating Manual 01 / 2021
Malfunction
Possible reason
Correction
The thermal imager
cannot be switched on.
The battery is
completely discharged.
Charge the battery.
Can‘t be powered by an
external power source.
USB cable is damaged.
Replace USB cable.
The external power
source is discharged
Charge the external
power source (if nec-
essary).
The image is blurred,
with vertical lines and
an uneven background.
Calibration needed.
Perform image cali-
bration as described in
section 15. "Calibration
Function (FCC)".
The image is too dark.
The brightness setting is
too low.
Set the display
brightness.
Coloured lines appear
The unit has been
After the unit has been
on the display or no
exposed to static
exposed to static elec-
image is shown.
electricity during
operation.
tricity, the unit will either
restart automatically or
you will have to switch
it off and on again
manually.
Low image quality/re-
duced detection range.
These problems can occur when an observation is
carried out on a day with difficult weather condi-
tions (high humidity, snowfall, rain, fog etc.).
The smartphone or
tablet PC cannot be
connected to the unit.
The unit’s password has
been changed.
Delete the network and
reconnect using the
existing password.
The unit is located in an
area with a large num-
ber of WiFi networks that
may cause interference.
To ensure stable WiFi
operation, place the
unit in another location
with fewer or no WiFi
networks at all.
No WiFi signal available
or interrupted.
The unit is outside the
WiFi range. There are
obstacles between the
unit and the receiver
(e.g. concrete walls).
Place the unit within line
of sight and range of the
WiFi signal.
When the unit is used at
low temperatures, the
image quality of the
surroundings is worse
than at temperatures
above freezing.
At temperatures above freezing, the observed ob-
jects (surroundings and background) are different
temperatures due to thermal conductivity
, resulting in a high temperature contrast. Thus, the
picture quality achieved by the unit is higher.
At low outdoor temperatures, the observed
objects (background) usually cool down to about
the same temperature, so that the temperature
contrast is considerably reduced and the image
quality (details) is lower as a result. This is a property
of thermal imagers.