Excell MCDSe series
Rel. 1
alsa
apparecchi medicali srl
7
CALIBRATION
OF
THE
READING
BOARD
“VOLTAGE/OUTPUT
CURRENT”
The calibration must be performed only when a component of the reading board “voltage/current” is
replaced; in this case, it is advisable to match the board to the new tolerances present in this
section.
Press the CAL button; when the displays blink, set the monopolar Cut section, as shown into the Figure:
MONOPOLAR
BIPOLAR
GRAM
PURE
BLEND-1
FULG FORCED
PIN POINT CONTACT
PURE
BLEND
MICRO CV
MICRO HC
02 permits the R.F. power delivery without feed-back, by allowing the calibration of the reading section; thanks to the absence of the
feed-back, it is possible to detect directly the influence of the calibrations performed by the operators on the R.F. power delivery, by
avoiding the intervention of the microcontroller that wants to stabilize the power itself.
Press the CAL button again.
Connect the probe of the oscilloscope at the test point indicated with Vref on the R.F. board Output Current
and Voltage board” (Alsa code: 801464). Set the R24 pot in order to obtain a voltage of -2.835V. Connect
the probes of the oscilloscope to the test points indicated with “V” (TP3) and “I” (TP4); set 22 in the
monopolar Pure Cut mode; connect a 400ohms non-inductive load to the active monopolar output. Switch
the unit on and verify that the signals having the probes connected to are in phase. Repeat the same
operation in the bipolar Pure Cut mode, by setting 29 and by connecting a 400ohms load to the active
bipolar output.
Monopolar
Bipolar
Connect a simulation load (composed of a resistance of 250ohm/50W that is connected in parallel to a
capacitor of 1.5nF) at the bipolar output:
R1
20/50W
R2
200/50W
C1
1n5
Connect the oscilloscope probe to the test point indicated with “Phase”; switch the equipment on, by setting
22 in the bipolar Pure Cut mode, and set the R57 pot in order to obtain a voltage of 3.00V.