5 pulse types – Multichannel Systems STG4002 Manual User Manual

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Stimulus Generator 4002 Manual

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

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