Excell MCDSe series
Rel. 1
alsa apparecchi medicali srl 8
Set 5 in the monopolar Pure Cut mode, and connect a load 400ohms to the selected monopolar output;
connect the current probe in series to the load, and a voltage probe to the test point indicated with “I-IN”
(TP1). Switch the equipment on, and set the R54 pot: the value read by the voltage probe must be exactly
the double of the current measured by the probe connected in series to the load.
The main aim of this check consists in obtaining an output current of 500mA (in other words, 1.00V at the
test point “I-IN”): to do that, it is necessary to find the better “compromise” between the value of the power
set and the load connected to the output that permits the delivery of this current.
Start by setting 71 in the monopolar Pure Cut mode: switch the equipment on, and change the load at the
output until the current flowing in the load reaches 500mA; connect a probe of the oscilloscope at the test
point indicated with “I-IN” (TP1), and a second probe at the test point “IdB”. Switch the equipment on: the
signal “I-IN” must be 1V. Set the R49 pot: “IdB” must be 0.00V (± 1%). In order to obtain the maximum
reading reliability, set the vertical sensibility at 20mV/div for the reading of “IdB”.
Set 0A in the monopolar Pure Cut mode; switch the equipment on, and set the R61 pot: at the test point
“IdB”, the value must correspond to the logarithm of the voltage measured at the point “I-IN”:
)ln(
INIdB
VI
−
if, for example, the operator obtains a voltage of 110mV when activating the unit, the value to set R61 will
be:
2021100 ,),ln(
dB
I
Set again in the monopolar Pure Cut mode the value that had permitted before to obtain 500mA of current,
and verify that “IdB” still is 0.00V.
Connect the probes to the test points indicated with “V-IN” and “VdB”; set 52 in the monopolar Pure Cut
mode. By switching the equipment on, the measured value in “V-IN” must be 1.00V; just in case the voltage
is different from this value, change the setting of the power in order to obtain the specified value. Once this
setting has been completed, set the R50 pot to have on “VdB” a signal at 0.00V in correspondence of 1.00V
on “V-IN”. Also in this case, it is advisable to set the sensibility of the oscilloscope at 20mV/div in order to
obtain the maximum reading reliability; moreover, for the measurement of the signals with continuous wave
shape, the operator must reduce the bandwidth on the channel of the oscilloscope in order to eliminate as
much as possible the noises on the low amplitude signals.
Set 05 in the monopolar Pure Cut mode; switch the equipment on, and measure the value at the test point
“V-IN”. Now, activate the unit and set the R62 pot in order to obtain at the test point “VdB” a value that
corresponds to the natural logarithm of “V-IN”:
)ln(
INVdB
VV
−
At the end, verify again if, by setting the power in the Pure Cut mode in order to have “V-IN” at 1.00V, “VdB”
still is 0.00V.
Exit from the calibration mode by pressing the combination of the three buttons: calibration, selection of the
bipolar coagulation mode and monopolar coagulation power increase. The operator can also exit by
switching off and then switching on the equipment without pressing any button. Set 100 into the SPRAY
coagulation mode; connect at the selected monopolar output a 350ohms load with the current probe placed
in series to the load. Switch the equipment on, and set the R81 pot in order to calibrate the value of the
power supplied according to what had been set. Notably, a power of 100W corresponds to a current of
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