PowerLab Teaching Series - Owner’s Guide
22
The Isolated Stimulator
The PowerLab 26T and 15T have both normal and isolated outputs, and you can switch
between them in so ware. The Isolated Stimulator provides so ware-controlled,
isolated, constant-current pulse stimuli that can be used with human subjects. The
stimulus is produced at the outputs on the front panel of the Stimulus Isolator. The
stimulus is independent of the PowerLab sampling rate and can be generated whether
the PowerLab is sampling or not. The stimulus is set up using the Stimulator dialog.
Choose Setup > Stimulator.... to display the Stimulator dialog (Figure 2–3).
When setting up the Stimulus Isolator, you:
• Choose how stimulation should start.
• Choose a preconfigured stimulus type or mode.
• Optionally, on Windows, create a custom stimulus waveform.
• Set stimulus parameters, such as start delay, pulse width and current amplitude.
Note that if you connect a Stimulus Isolator front-end to a PowerLab 15T or 26/T, only
the external stimulator is used.
Choosing How Stimulation Should Start
Stimulation can be set to start in di erent ways:
• When sampling starts: stimulation begins automatically when the LabChart
Start button is clicked, and continues until sampling stops. Use the On and
O buttons to control pulse delivery, if necessary.
• Manually: stimulation begins when Stimulate in the dialog is clicked, and
continues until sampling stops. Use the On and O buttons to control pulse
delivery, if necessary.
• Independently of sampling: stimulation begins when On in the dialog is
clicked, whether or not LabChart is sampling.
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