User
Guide
for
Axoclamp
900A
HS
‐
9
Headstages
When
HS
‐
9
headstages
are
plugged
into
AUX1
or
AUX2
sockets
they
act
as
voltage
followers
only
(cannot
pass
any
current).
Output
Calibration:
10
V/V.
Input
loading:
<
5
pF
(un
‐
neutralized).
Bias
current:
<
2
pA.
Bath
Clamp
Headstages
Bath
Clamp
Headstage
plugged
into
AUX1
or
AUX2
sockets.
Clamp
Current:
100
μ
A
max
for
VG
‐
9A
×100.
Output
Calibration:
1
μ
A/V
for
VG
‐
9A
×100.
Since
there
is
a
fixed
gain
of
10:1,
the
BNC
output
saturates
at
1/10
th
of
the
maximum
current
but
clamp
continues
to
operate
up
to
the
maximum
specified.
Scaled
Outputs
Two
identical
scaled
outputs
are
provided
with
front
panel
output
BNCs.
Gain:
1
to
2,000
in
1:2:5
sequence.
Highpass
Filter:
DC
‐
300
Hz.
Lowpass
Filter:
Bessel,
2
Hz
to
30
kHz;
Butterworth,
3
Hz
to
45
kHz.
Output
(DC)
Offset:
Auto
zero
or
manual
setting
up
to
±
3
V
on
gains
<
10
and
±
300
mV
on
gains
>=
10.
Metering
(4
off)
Resolution:
16
bits.
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