Multichannel Systems STG1000 Manual - Manual (Page 77)

Troubleshooting
71
Each data column must have
a header (value, time, or
repeat).
The number of data columns
has to be consistent for all
lines in a given ASCII file (for
example, value, time, value,
time). This error message
indicates that there is a
current/voltage value or a
time point missing in line 12.
The ASCII file contains
current/voltage values
outside the STG's range. For
example, if the STG's output
range is +8000 mV, all values
above +8000 mV are set to
+8000 mV.
12.4 Strong Peak Artifacts
Strong discharges or other artifacts of the output voltage or current.
Possible causes:
One or both current outputs are open, that is, nothing is connected to them. The stimulus
generator tries to hold a stable current against the indefinite resistance of the open current
output. Therefore, the stimulus generator will increase the output voltage on the open current
outputs to its maximum, which will result in a heavy load on the power supply. This situation may
cause the power supply to become unstable, which may lead to artifacts on all channels.
• In voltage mode: Short-circuit the +I and I outputs with the provided cables for saving power
and suppressing noise. Please see also the recommended setups in the chapter Voltage Mode.
• In current mode: Connect the unused current output to ground (GND). Please see also the
recommended setups in the chapter Current Mode.
12.5 Output Signal Does not Match Programmed Signal
The amplitude or the duration of the output pulses differs from the programmed signal.
Possible causes:
The stimulus protocol works near the resolution limits of the STG, that is, the pulses are very short
or the amplitudes very low (smaller than 200 mV or 100 μA). Due to the intrinsic properties of
the electronics, the timing and the amplitude of short or small pulses are limited. Please see also
the chapters "Rise Time" and "Amplitude-Dependant Time Lag".
• Check the output signals with an oscilloscope and modify the pulse protocol so that the amplitude
and timing of the pulses will match your requirements.