Multichannel Systems STG4002 Manual - Manual (Page 20)

Stimulus Generator 4002 Manual
16
5.5
Pulse Types
Three basic pulse types are available in MC_Stimulus II. You can create virtually any pulse
by combining different types:
 Rectangular
 Ramp
 Sine wave
Note: The time resolution is 20 μs . When you enter time steps that are not a multiple of 20 μs,
the length of the step is internally adjusted (rounded arithmetically, that is, 249 μs would be
rounded down to 240 μs, 250 would be rounded up to 260 μs) to a valid value. The minimum
voltage resolution is
1 mV , the current resolution is 200 nA . Please regard also the minimum
and maximum output voltage / current of your STG version. If you enter voltage or current
values outside the STG's limit, the invalid value will be changed automatically when you download
the protocol. Cells with changed values will be highlighted in yellow.
Note: If you work near the resolution limits of the STG, the output pulses may differ from the
programmed pulses . In this case, you should check the output with an oscilloscope. Please see
also the "Analog Output Signals" chapter.
Please note that the memory of the STG4002 is limited (64 MB). You will get an error message
if the memory is full.
For the digital Sync channels, only TTL pulses with bit patterns of 0 (LOW) and 1 (HIGH) can be
programmed. A logical state of 1 (HIGH) results in a 3.3 V output signal, and a logical state of
0 (LOW) results in a 0 V output. Please note that the digital output is sent about 20 μs faster
than the analog output. Please see also the "Triggering Stimulation" chapter.
Rectangular pulse type