68 • Reference Section
MultiClamp 700A Theory and Operation, Copyright 2000, 2001 Axon Instruments, Inc.
The MultiClamp Commander provides two electrode compensation controls, Cp Fast
and Cp Slow. Cp Fast compensates that part of the electrode capacitance that can be
represented by a lumped capacitance at the headstage input. This is the major part of
C
p
. A small amount of C
p
can only be represented as a capacitor with a series
resistance component. This takes longer to charge to its final value and is compensated
by the C
p
Slow controls.
C1 = 1 pF
R
f
R
p
OPEN
CIRCUIT
10 V
p
FAST MAG
SLOW MAG
SLOW
FAST
+
I
p
C
p
V
p
I
C1
I
+
+
+
τ
+
-
τ
Figure 4.6. Pipette capacitance compensation circuit.
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