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HEADSTAGE TUNING PROCEDURE
Axopatch 200B, Copyright 1997-1999, Axon Instruments, Inc.
Set FILTER to 1 kHz.
Set scope to 0.1 V/div, 5 ms/div.
Set switch 4 of SW8 to ON.
Trim RT20 (DIAB-2 MAG) and RT21 (DIAB-2 TAU) as above to remove the most
significant portion of the reset transient. See Figure 25d. It may be necessary to re-
trim RT18 and RT19 to optimize response.
If a slow tail (τ > 5 ms) still remains, it can be compensated with RT25 (DIAB-3 MAG)
and RT26 (DIAB-3 TAU). For the most accurate adjustment of these trims, a 100 Hz 4-
pole (or greater) Bessel filter should be connected between the SCALED OUTPUT and the
scope. The next steps assume the 100 Hz filter is installed.
Set scope to 20 mV/div, 50 ms/div.
Set switch 5 of SW8 to ON.
Trim RT25 and RT26 to minimize slowest transient. As above, some re-trimming of
RT20 and RT21 may be necessary to achieve optimum compensation. See
Figure 25e.
Figure 25.
Reset transient compensation.
For clarity, only one reset polarity is shown (positive DC current).
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