Alpha MED Scientific MED64-Entry, Manual

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The maximum input voltage is entered to Max input. When a signal exceeding the set value is input during recording, the set value
is acquired as the saturated value. Digitizer resolution is 16 bit in the MED64-Entry, which follows that the resolution of the voltage
value is a value obtained by dividing Max input by 2
16 . Set an appropriate value according to the magnitude of extracellular
potential obtained from the biological specimen. High pass filter or Lowpass filter is not applied to the data file output. Instead,
they are applied to the displayed raw waveform in OSCILLOSCOPE or RAW WAVEFORM - SELECTED ELECTRODE during data
acquisition.
4.2. Creating the stimulation pattern – STIMULATION subpanel and STIMULATION PATTERN tabs
The STIMULATION subpanel has 3 tab windows; Step 1, Step 2 and Manual. When either Step 1 or 2 is enabled and the stimulation
pattern is set in that tab, the pattern is applied to all repeats. If both Step 1 and 2 are enabled and stimulation pattern is set, the
pattern is applied alternatively for each repeat. For repeat 1, stimulation pattern of Step 1 is applied; for repeat 2, stimulation
pattern of Step 2 is applied; for repeat 3, stimulation pattern of Step 1 is applied, and so on (see the right panel of the figure
below). Because the MED64-Entry Amplifier has 2 terminals (S1 and S2) for stimulation output, the stimulation pattern is applied to
up to 2 electrodes in one Step.
Schematic drawing of data acquisition and stimulation pattern. In this example, a stimulus is applied to 1 electrode in Step 1 and a
different stimulus is applied to the other 2 electrodes in Step 2.
Note: The length of the stimulation pattern must not exceed the length of Time.
The Manual tab has a Start Stim button enabled only during the pause between repeats. When the Start Stim button is clicked, the
stimulation set in the Manual tab can be applied manually at any time. When the stimulation is applied during the recording of
data, the data file for that interval is output as a separate file.
The minimum unit composing a stimulation pattern is a biphasic pulse or a monophasic pulse. A stimulation pattern is composed
by coupling 1 or more stimulation pulse set at the Pulse config.
Repeat # 1
Repeat # 2 Repeat # 3
Time
(acquisition)
Interval Interval Interval
・・・
Repeat # 1 Repeat # 2 Repeat # 3 Repeat # 4
Time Time Time Time
Interval Interval Interval Interval
S1
S2
Step 1 Step 2 Step 1 Step 2
Step 2 Step 2
not set not set
Check to enable
“#” is added before and after the
tab name for the invalid step.
Tab menu
Time
(acquisition)
Time
(acquisition)