2 pulse types – Multichannel Systems STG1000 Manual User Manual

Page 18

Stimulus Generator 1000 Series User Manual

5.2 Pulse

Types

Three basic pulse types are available in MC_Stimulus. 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 to a valid value. The changed values do

not

show up

in the worksheet, but invalid values are highlighted in yellow or red. The minimum voltage
resolution is

2 mV

, the current resolution is

1 μA

. Please regard also the

minimum

and

maximum output voltage/current

of your STG version.

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.

Note: The

total pulse length

of all channels has to be

identical

. If the stimuli of two channels

have different lengths of time, the last used value of the shorter channel is

kept

until the longest

stimulus has been finished. You will be notified with an error message at the beginning of the
download.

Please note that the memory of the STG is limited. You will get an error message if the memory is
full. The new generation of stimulus generators (STG2004/8) has 16 times more memory and an
improved internal memory management, perfect for sophisticated or long-term stimulus
protocols.

For the digital Sync channel, only bit patterns of 0 (LOW) and 1 (HIGH) can be programmed. A
logical state of 1 (HIGH) results in a 5 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