TEC-B-01 User Manual
____________________________________________________________________________________________________________________________
__________________________________________________________________________________
version 1.1
page 20
Tuning Procedure
Before you switch to VC mode tune all parameters related to the recording electrodes (offset,
capacity compensation etc.) in CC mode, set GAIN to a low, save level and the control mode
switch to NORMAL, GAIN ONLY (see chapter 5.5). Activate the OSCILLATION SHUTOFF
unit!
Switch to VC mode and apply identical test pulses to the cell model.
The controller is now in P-mode (proportional only). Watch the potential output and increase
the GAIN so that no overshoot appears.
If you a working on slow currents
Switch the control mode switch to SLOW, INTEGRATION to activate the integrator. The
controller is now in PI-mode (proportional-integral). Tune the GAIN again (see above).
Watch the potential output and tune the time constant until the overshoot of the desired tuning
method appears (see also Figure 6).
LO
Only a P-Controller is used. The response to a
command step is slow and has no overshoot
(potential output). The response to a
disturbance e.g. an activating channel is slow
and has a large deviation.
AVO
A PI-Controller is used. The response to a
command step is very fast with 4% overshoot
(potential output). The response to a
disturbance e.g. an activating channel is slow
and has a slight deviation.
SO
A PI-Controller is used. The response to an
unsmoothed command step is fast with 43%
overshoot (potential output). The response to a
disturbance e.g. an activating channel is very
fast and has a slight deviation.
Figure 6: tuning VC according LO, AVO or SO. The potential output is shown.
