Single Channel EEG Test System | User Manual
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2.5.7 Special functions
Baseline reset test
(sine wave only):
When checked the parameters are ignored and a large
signal of 1Vpp (0.354Vrms) is applied. It is intended to
test the EE
G’s response to overload, in particular
automated resetting of baseline (due to high pass
filtering). When unchecked, the system reverts to the
previous settings (e.g. 1mVpp 10Hz signal). Mains
frequency of the test can be selected from 50Hz or
60Hz.
Frequency scans:
Sine: may be used to test systems with extended
frequency response. This system uses a fixed sampling
rate of 5kHzwhich has been found to reduce problems
of beating from other digital sources. If beating still
occurs, a separate analogue input at BNC1 is provided
to allow testing with analogue type function
generators.
2.5.8 Special waveforms and load waveform
There are two features on the bottom right frame
: “
Special Waveforms
” and
“
L
oad waveform”.
For these two features, the amplitude and frequency
settings have no effect.
Special Waveforms:
WhaleTeq SEEG can play PhysioNet waveforms with 1 electrode at each time.
This feature will download waveforms from PhysioNet directly. Please check
your internet status before use this feature.
The SEEG built-in databases are as below
:
-
EEG Motor Movement/Imagery Database (eegmmidb)
:
Each volunteer performed different motor/imagery tasks while 64-
channel EEG were recorded.
for more details.
-
CHB-MIT Scalp EEG Database (chbmit)
:
This database, collected at the Children’s Hospital Boston, consists of
EEG recordings from pediatric subjects with intractable seizures. Each
seizure is annotated.
for more details.