probe check
off
scan frequency off
contrast
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3.2.3
Special functions
Additional functions are available within a second menu level. These can be accessed by pressing
and holding the “SET” button for approximately 2 seconds. Switching between these functions is
accomplished in the manner already described. The menu level can only be exited by pressing the
“START/STOP” key. In doing so, settings and function statuses are carried over and executed.
Check the ultrasonic transducer
Search resonance frequency
Set monitor contrast
Software version and latest start frequency
Check the ultrasonic transducer [probe check]
This function is used for quick veri
fi
cation of whether the ultrasonic transducer is recognised by
and can be correctly activated by the ultrasonic generator. After a change in probe or in operating
conditions it is possible, for example, that the ultrasonic generator cannot synchronise with the
ultrasonic transducer and issues an error message, e.g. Error 011. The ultrasonic frequency is
reset to the base value and the function is restored if no device fault or other cause is present.
The default value is “o
ff
”. In order to activate the function, set the parameter to “start”
using the rotary knob, and then press the “START/STOP” button. See Chapter 6.2.1 for
additional information.
Search for resonance frequency [scan frequency]
This function is an expansion of the above-mentioned “probe check” function. In addition, a
frequency scan is conducted in order to determine the correct HF or ultrasonic frequency for the
ultrasonic transducer. Depending upon the probe used and the operating conditions, the frequency
can
fl
uctuate signi
fi
cantly, to some extent. When switched o
ff
, the ultrasonic generator saves
the current frequency value and uses it as the start value when switched on again. If there are
signi
fi
cant deviations in the current ultrasonic frequency, this can lead to malfunctions.
Please note:
After a successful scan while in continuous operation (pulsation = o
ff
, time > 30 s), start with
an amplitude setting of 50 % and check the operation. Next, set the desired default value.
Setting the monitor contrast [contrast]
With this function, the monitor contrast can be adapted to the local light conditions. The contrast
values range between 1 and 255, and can be set by turning the rotary knob. Smaller values result
in a darker image and larger values result in a lighter image. The default value is 240.
