Guide
to
Electrophysiological
Recording
isolation
transformer
can
acoustically
couple
to
the
input
of
the
headstage.
This
was
traced
to
the
silver
wire
of
the
electrode
and
was
solved
by
trimming
off
a
fraction
of
the
wire,
thus
changing
its
resonant
frequency.
Compatibility
of
the
HS
‐
2
and
HS
‐
2A
with
the
Axoclamp
900A
HS
‐
2
and
HS
‐
2A
headstages
can
be
used
with
the
Axoclamp
900A,
but
they
need
to
be
connected
using
an
adapter
cable.
Once
this
is
done
the
Axoclamp
900A
Commander
recognizes
the
headstage
as
a
custom
type
and
prompts
for
current
injection
resistance
and
capacitance
values.
This
message
appears
on
startup
of
the
Commander.
Once
a
custom
headstage
is
connected
correctly
the
Commander
can
be
shut
down
and
restarted
without
prompting
for
values
again.
To
change
a
custom
headstage
from
one
type
to
another
the
user
can
unplug
and
re
‐
plug
the
cable
from
the
back
of
the
unit.
Figure
43.
Custom
headstage
dialog.
General
Characteristics
The
HS
‐
9A
headstage
buffers
the
high
impedance
of
the
microelectrode,
making
the
potential
recorded
by
the
microelectrode
available
to
the
rest
of
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