Controlling E9Screen EPC9 Installation 84
• In voltage clamp mode (VC-mode):
VHOLD: -0.080; IGAIN: 1.0000E+09
0 [V] 1.0000E+01
1 [-] 1.0000E+00
2 [-] 1.0000E+00
3 [-] 1.0000E+00
4 [-] 1.0000E+00
5 [-] 1.0000E+00
6 [A] 1.0000E+09
7 [A] 1.0000E+09
• In current clamp mode (CC-mode):
IHOLD: 1.0000E-10; IGAIN: 1.0000E+09
0 [V] 1.0000E+01
1 [-] 1.0000E+00
2 [-] 1.0000E+00
3 [-] 1.0000E+00
4 [-] 1.0000E+00
5 [-] 1.0000E+00
6 [A] 1.0000E+09
7 [A] 1.0000E+09
The meaning of the parameters in the first text line are:
• The first character (“V” in VHOLD and “I” in IHOLD, respectively) indicate the
amplifier mode (voltage and current clamp).
• VHOLD gives the applied holding potential in volts. IHOLD gives the applied
holding current in amperes.
• IGAIN gives the amplifier gain in ohms, i.e. V/A. To compute the real current from
a measured voltage, divide it by this value.
The meaning of the parameters in the following lines are:
• The first number is the index of the described AD-channel.
• The letter in the square brackets gives the logical unit of that channel, i.e., "V" for
the voltage monitor, and "A" for the current monitors. A hyphen marks AD-
channels without a logical EPC9-function.
• The last number in the line is the gain of that AD-channel. You can derive the
voltage acquired from that AD-channel by the given number to get the correct
value, e.g. the control voltage and the pipette current.
Notes: The line marked "[V]" gives the value of the "Voltage Monitor" BNC-connector
on the EPC9 front panel.
The lines marked "[A]" give the values of the "Current Monitor" BNC-
connectors on the EPC9 front panel.
Make sure that the option Enable Background is de-selected, when you want to acquire
data with the EPC9 acquisition board. When E9Screen is in the background, the AD-
channel assignments are as follows:
• AD-6 is the I-mon 2 input, i.e., the current input after filter 1 and filter 2.
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