Proper use
27
Table 3. Continued
Trouble Symptom
Cause
Way of Removal
High
electromagnetic
interference in the recorded
signal (frequency
– 50 Hz or
divisible to it
– 100 Hz, 150
Hz, etc.).
The electrodes not used at
the moment are connected to
the
amplifier
(i.e.
the
electrodes are not applied on
the examined animal but
“hang in the air” and cause
interference).
Disconnect the electrodes not
used at the moment from the
amplifier.
Improper
placement
of
electrodes.
Start
the
impedance
measurement and obtain the
accepted value. In case of
electrode
failure,
replace
them (for example, in the
event of a break).
Bad grounding of the system. Ground the system properly.
The presence of powerful
noise
sources
(X-ray
equipment, physiotherapeutic
room, powerful refrigerating
systems,
electric
motors,
electric welding, etc.).
Try to switch off or move off
these powerful devices on the
bigger
distance.
If
it
is
impossible, try to obtain better
parameters of the system
grounding.
There is no stimulus during
the
acquisition
with
stimulation.
The stimulation device is not
connected (or connected
unsafe) to the stimulator unit.
Make sure that the stimulation
device is connected to the
stimulator unit safely.
The connection between
stimulator and computer is
broken.
Execute the
Setup|Hardware
reset
menu command and try
the start again. If it fails,
restart the computer.
