VA-10X User Manual
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version 7.0
page 10
5. Headstage
The VA-10X comes with the standard headstage (range:
1000 mV) for connecting carbon-
fiber electrodes via an electrode holder (optional).
A 3-electrode headstage with differential input (see also
Optional accessories
in chapter 3,
and chapter 5.2) is also available. For details contact npi.
Figure 2: Headstage of the VA-10X
5.1.
Headstage Elements
1
BNC connector for the electrode holder
2
GROUND: ground
3
COMMAND: command potential output
4
headstage cable to amplifier
5
REFERENCE: not installed
In the 2-electrode headstage the REFERENCE is not installed. The table indicates whether
the headstage is equipped with the standard feedback resistor (500 M
) or with a different
one. It is also marked whether the headstage is in 2-electrode or in 3-electrode configuration.
The electrical connections are made like in a conventional patch-clamp headstage (e.g. the
headstage of the EPC-7 (Heka elektronik, Lambrecht, Germany).
The carbon-fiber electrode fits into the BNC connector of the headstage (#
1
, Figure 2). An
electrode holder (optional) gives additional mechanical stability. Ask npi for details.
GROUND provides the ground and is linked to the bath, e.g. via an Ag-AgCl pellet.
COMMAND provides the command potential at the electrode and remains usually open, but
