Analog Input
The
Analog Input
channels (Fig.
) acquire from the
Analog Input
BNC connector ports. For these channels,
Se-
quence Options
are replaced by
Global Options
concerning the acquisition of data. These
Global Options
are applied
to all
Analog input
channels. They use different
Channel Modes
unique to the
Analog Input
channels.
Figure 3.13:
Channel(s) configuration window, Analog Input Linear
There are two
Global Options
available to all
Analog-in Modes
.
1. The
Acquisition Rate
(Fig.
) is measured in kilosamples per second. A rate of 1 kSps will acquire 1,000 samples
per second per channel. During an acquisition, a maximal amount of 3.6 * rate [in kSps] MB/min of data are created.
2. The
Trigger Options
defines the trigger source and mode.
a) The
Trigger Source
is either
Manual
or a
Digital I/O
channels.
b) The
Trigger Mode
is either
Triggered
or
Gated
.
Gated
mode is only available when the trigger source isn’t
Manual
.
Each
Analog-In Mode
has a specific set of paramters. The function of each
Mode
is described here.
• The
Linear
channel mode (Fig.
) allows the direct measurement of signal received by a channel. The linear
mode has the option of a frequency filter, found in the
Filter Options
box.
1. When the
Activate Filter
checkbox is selected, the defined filter is applied on all input data and displayed on
a new trace. The filtered data is for display only, and will not be saved.
2. The
Filter Family
drop-down list is used to choose the filter type. These include
Bessel, Butterworth
and
Chebyshev (I ad I)
filters.
3. The
Filter Type
drop-down list allows the choice of a filter type from
High-Pass
,
Low-Pass
,
Band-Pass
and
Band-Stop
.
4. The
Ripples
box is only available for
Chebyshev
filters. The ripple (either in the passband, or in the stopband)
defines the acceptable filter response ripples. The higher the ripples, the sharper the filter response.
5. The
Order
selector is linked to filter sharpness; a higher order will provide a sharper filter.
6. The
Cutoff Frequency
boxes are used to define the low/high cutoff values for the filter, depending on the
type used. The cutoff frequency must be less than half of the sampling rate.
Chapter 3. Doric Neuroscience Studio
24