12
Publication 5720-001 REV1.0
Control Description
Commands
The
commands control block contains the hold
controls and
command in
÷10 input BNC.
hold
controls -
hold potential is set with the digital
potentiometer
thumbwheel and
range
toggle switch. Ranges
are ±99 mV and ±198 mV depending on the scale multiplier
selected (
x1.0
or
x2.0
). Signal polarity, or
off
is selected with the
associated toggle switch.
command in ÷10 input BNC- Command signals from an external
generator or computer connected to this input are attenuated by
10. Maximum input is ±10 V.
Current Electrode
The
current electrode block includes the V
e
offset,
electrode test, and V
e
buzz controls. This section also
contains the
over voltage
indicator and a DIN connector
for the current electrode.
V
e
offset - With a range of ±200 mV (center zero), this
control is used to adjust the offset voltage of the current
electrode. Use this control to establish a zero reference
before impaling the oocyte. Once the oocyte has been
pierced, the resting potential can be read from V
e
x10
output BNC or on the
current meter
(bath electrodes section).
electrode test - A voltage proportional to the resistance of the current electrode [10
mV/M
Ω
] will be displayed on the meter by depressing the
electrode test push button
when the
clamp
mode selector
switch is in the
off
position.
V
e
buzz
- The V
m
buzz pushbutton facilitates penetration of the voltage electrode by
producing a 1 kHz square wave at the pipette tip.
over voltage LED - If the voltage at the current electrode exceeds ±160 V, the over
voltage
lamp will light. An alarm will also sound when the rear panel
alarm
switch is in
the
on
position.
