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Figure 2–3
The Bio Amp dialog,
Windows (for the Dual
and Octal Bio Amps)
Chapter 2
Setting Up
The Bio Amp
The Bio Amp dialog (Figure 2–1 and Figure 2–3) allows software control of
the combined input amplifiers and filters in the PowerLab and Bio Amp. The
signal present at a channel's input is displayed in the preview area so that you
can see the effects of changes in settings. Change settings in the dialog, then
OK
click the
button to apply them.
The Bio Amp dialog appears when you choose
Function pop-up menu (or click
the Channel Settings dialog). To set up many channels quickly, click the
arrows by the dialog title, or press the left or right arrow keys on the
keyboard, to move to the equivalent dialogs for adjacent channels. This skips
channels that are turned off. The channel number is shown next to the arrows.
Signal Display
The input signal is displayed so you can see the effect of changing the settings
— no data are recorded while setting things up. Slowly changing waveforms
are represented quite accurately, whereas quickly changing signals are
displayed as a solid dark area showing only the envelope (shape) of the signal
formed by the minimum and maximum recorded values. The average signal
value is shown above the display area.
You can stop the signal scrolling by clicking the Pause button at the bottom
left (Macintosh) or top right (Windows) of the data display area. This changes
to the Scroll button on the Macintosh. Click the Scroll button to start scrolling
again.
Signal amplitude
Click this buttons to open the Units Conversion dialog
Bio Amp...
Bio Amp...
in the Input Settings column in
Pause and Scroll buttons
from a Channel
Range pop-up
menu
Filtering
options
Amplitude
axis
25
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