BA-01X User Manual
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version 1.9
page 10
(13) BIAS (bias current) potentiometer
Potentiometer for cancellation of the output current (BIAS current) of the
(headstage) (ten-turn potentiometer, symmetrical, i.e. 0 pA = 5 on the dial),
range: current range x1 and x10:
±
200 pA (see chapter 7.1).
PENETRATION unit
The PENETRATION unit consists of (14) ELECTR.CLEAR switch, (15)
BUZZ push button, (19) BUZZ DURATION potentiometer and (20) BUZZ
REMOTE connector.
(5) ELECTR.CLEAR switch
Momentary switch for activating the ELECTRODE CLEAR circuit that can
be used to clean the tip of the electrode by passing large amounts of positive
or negative currents. The circuit is operated by pushing the switch to +I
max
(maximum positive current) or -I
max
(maximum negative current). The
maximum current is dependent on the setting of the current range, see also
(10).
(15) BUZZ push button
Push button to activate the BUZZ circuit (duration set by (19)). To facilitate the
penetration of the cell membrane the BUZZ circuit is provided, which is based on
oscillations caused by overcompensating the capacitance compensation system. This yields
to very powerful high-frequency oscillations (see Figure 2).
(19) BUZZ DURATION potentiometer
Control to set the duration of the BUZZ (potentiometer, clockwise, range: ~1 ms to
~100 ms). The duration is also slightly dependent on the setting of CAPACITY COMP.
(17). It is effective in both modes (REMOTE and BUZZ), see also (20).
(20) BUZZ REMOTE connector
BNC connector for operating the BUZZ circuit remotely. The remote device is connected
via a grounded BNC cable. The duration of the BUZZ is dependent on the setting of the
BUZZ DURATION potentiometer (19).
Figure 2: buzz function of the BA-01X
-12000
-8000
-4000
0
4000
8000
12000
time (ms)
potential (mV)
start
stop