Erbe ICC 200, Service Manual

Page: 106 / 266

1 TEST PROGRAMS AND ADJUSTMENTS 106
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Adjustment of Neurotest
board
Neurotest board
EE 30128-070
Jumper JP4 on the front panel is used to activate the display of the feedback frequency of output current
measurement and display of the feedback frequency of the remote control are activated.
ATTENTION
On the ZMK version, there is a display only during activation and if the Neurotest circuit is closed. On the
TUR version there is a display as soon as the NT LED lights up on the remote control.
AUTO CUT AUTO COAG 1 AUTO COAG 2 AUTO BIPOLAR
SPH Intensity no. Frequency measurement Current measurement
SPH: The Neurotest program is activated.
Intensity no. Set intensity number is 1…5. It corresponds to the intensity number which has been set
on the remote control.
Frequency measurement Measurement of feedback frequency of the remote control.
Current measurement Measurement of feedback frequency of the output current measurement.
Setting the feedback frequency of output current measurement
(trimming potentiometer TP 1: Setting the feedback frequency)
The Neurotest board is isolated and actuated via optocoupler. The feedback frequency of the output current
measurement also takes place via an optocoupler. The output current pulse is converted into a frequency.
This frequency can be measured at test point MP7. Test point MP6 is reference ground. Test points MP6 and
MP7 relate to the electronic circuitry of the ICC unit. Without activation, the feedback frequency is 0 Hz.
After the pulse time, the feedback frequency is only available at MP7 for a brief period.
Test setup
At the Neurotest output, connect up a test resistor of 1 kOhm, 0.5 W and 1%. On the TUR version, the
Neurotest output is between the neutral electrode and the CUT/COAG 2 output. The TUR version is activated
with the yellow pedal of the dual-pedal footswitch. On the ZMK version the Neurotest output is between the
neutral electrode and the Neurotest output. The ZMK version is activated with the ZMK fingerswitch.
The setting is performed at intensity 3. For this setting the set feedback frequency must be adjusted to 73. If
the electronic fuse trips, the display of feedback frequency is approx. 40.