Multichannel Systems STG4002 Manual - Manual (Page 35)

Programming Stimulus Protocols
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5.9
Adjusting the Stimulus Intensity Level
After having programmed the stimulus protocol, you can either download the protocol "as is", or
you can adjust the stimulus intensity level, that is, choose a percentage (from 0 to 200 percent)
of the programmed amplitudes, independently for both channels. You can adjust the level offline
and download the information onto the stimulus generator manually afterward, or you can
adjust the level on-the-fly, without stopping the running stimulation. This feature is especially
convenient for testing out thresholds that evoke a biological response.
Note: The error messages that are displayed when the stimulus amplitude is not set to zero at
the end of the protocol or when the time length of stimulus protocols is different on individual
channels can present a nuisance when adjusting the level on-the-fly. These error messages can
be switched off by deselecting the option Enable Compiler Warnings on the Settings menu.
1. On the Edit menu, click Amplitude. The Amplitude dialog box opens. You can drag and drop
it anywhere you like on the screen, also outside the main window of the MC_Stimulus II program.
This is especially convenient when you are using two monitors.
2. Select the option Auto Download if you want to adjust the stimulus intensity level on-the-fly.
Deselect the option if you want to download the changes manually later.
3. Select the option Change All if you want to adjust the stimulus intensity to the same level
on all channels. Deselect the option if you want to set individual channels to different levels.
4. Drag the slider with the mouse for adjusting the stimulus intensity in the range of 0 to 200
percent of the programmed stimulus amplitudes. The WYSIWYG display is updated automatically.
The worksheet is not updated. It always relates to the stimulus protocol that you programmed
initially. If Auto Download is selected, changes are immediately downloaded onto the
stimulator after releasing the slider, and the stimulus protocol is restarted from the beginning,
with the adjusted stimulus intensity level.
5. If Auto Download was not selected, you need to download the stimulus protocol manually
for changes to take place.
6. You can click the Reset All button to set the level on all channels back to 100 percent.
Channel 1 is set to 100 %, that is, the stimulus protocol will be downloaded onto the stimulus
generator as it was programmed in the worksheet. Channel 2 is set to 200 %, that is, all stimulus
amplitudes programmed on channel 2 are doubled.