Erbe ERBOTOM ICC 350 M, Instruction Manual

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5-3
If the knob for this remote control is set to switch position 0, the Neurotest device is switched
off. This is indicated by the signal lamp labelled HF. For switch positions 1-5, the Neurotest
device is switched on and can be activated via the Neurotest electrode handle. This is indicated
by the signal lamp labelled NT.
The stimulation current pulses from the NEUROTEST device are transmitted via the electrode
handle with electrode connected to the NEUROTEST socket. It is activated via the key on the
Neurotest electrode handle.
The Neurotest device can only be activated in switch positions 1-5 on the remote control.
Setting the intensity of the current pulses
The intensity of the current pulses can be set from 5 to 25 mA in five steps of 5 mA each. The
respectively set intensity is automatically and constantly controlled within the practically expected
resistance range.
Step 1 = 05 mA from 0 to 20.0 kOhm
Step 2 = 10 mA from 0 to 10.0 kOhm
Step 3 = 15 mA from 0 to 6.6 kOhm
Step 4 = 20 mA from 0 to 5.0 kOhm
Step 5 = 25 mA from 0 to 4.0 kOhm
Signaling of the current pulses
It is a prerequisite for clear identification of electrically stimulable tissue structures that current
pulses are actually present. If the unit did not provide any current pulses, for example due to an
interruption in the cables unnoticed by the user, and consequently no stimulation occurs, this
could erroneously lead to the belief that no electrically stimulable tissue structures are present in
the affected area.
For this reason, the NEUROTEST device only produces acoustic signals (beeps) if the current
pulses are flowing with at least 3 mA. Current pulses can only flow if the stimulation electrode
is in contact with electrically conductive tissue and the circuit is closed by the patient via the
neutral electrode.
Safety of the NEUROTEST device
The following safety-related functions of the NEUROTEST device in the ERBOTOM ICC 350 Z
are automatically monitored:
a) When activating the NEUROTEST device, a test is first made as to whether a neutral electrode
is connected to the unit and to the patient (the latter only if a neutral electrode with two
contact surfaces is used). If there is an error, this is signaled visually and acoustically.
b) During every activation of the NEUROTEST device, the pulse generator is monitored for
unit-related output error. Here, every pulse is automatically monitored. If the amplitude of
a pulse is greater or less than the currently set amplitude, the unit produces warning signals.
If the amplitude of a pulse exceeds a maximum value, the output circuit is automatically
switched off immediately. If the amplitude was so high that the electronic fuse was triggered,
this error is indicated by error no. 90.
c) Every time after switching on the NEUROTEST device, the function of the electronic fuse
hardware is automatically tested. If an error in the electronic fuse hardware is determined,
this is indicated for a few seconds by error no. 91.