4
Components and their functions
Front panel
(1) POWER
To turn the amplifier on and off.
Caution: Do NOT turn on the power with a "mini-plug" connected on the output terminal of the internal stimulators
(#2, 3, 4 & 5). This may cause damage to the microelectrode(s) on the probe.
(2) OUTPUT INT(V) [CH1]
The output terminal for the variable, internal channel 1 (CH1) constant current stimulator. The amplitude of the
current delivered is variable (V) and can be adjusted with dial (6)
*1
.
(3) OUTPUT INT(F) [CH1]
The output terminal for the fixed, internal channel 1 (CH1) constant current stimulator. The amplitude of the cur-
rent delivered is fixed (F) and set on the computer
*1
.
(4) OUTPUT INT (V) [CH2]
The output terminal for the variable, internal channel 2 (CH2) constant current stimulator. The amplitude of the
current delivered is variable (V) and can be adjusted with dial (7)
*1
.
(5) OUTPUT INT(F) [CH2]
The output terminal for the fixed, internal channel 2 (CH2) constant current stimulator. The amplitude of the cur-
rent delivered is fixed (F) and set on the computer
*1
.
(6) AMPLITUDE [CH1]
This 'potentiometer' is used to adjust the output amplitude for the variable, CH1 stimulator (2). The initial
(x1)amplitude, which is set in the computer software, can be adjusted in 0.1 steps between 0 and 10 times.
(7) AMPLITUDE [CH2]
This 'potentiometer' is used to adjust the output amplitude for the variable, CH2 stimulator (4). The initial
(x1)amplitude, which is set in the computer software, can be adjusted in 0.1 steps between 0 and 10 times.
(8) OUTPUT EXT [CH3]
The output terminal for an external stimulus isolation unit (see page 4)
*2,*3
.
(9) OUTPUT EXT [CH4]
The output terminal for an external stimulus isolation unit (see page 4)
*2,*3
.
(10) INPUT EXT [CH3]
The input terminals (+ & -) for an external stimulus isolation unit.
(11) INPUT EXT [CH4]
The input terminals (+ & -) for an external stimulus isolation unit.
(12) ELECTRODE SELECTOR
The terminal(s) used to select the stimulus electrodes on the MED probe. Use a MED64 mini-plug to connect to
either terminals (2) through (5) or terminals (8) and (9).
*1
The internal stimulus amplifier in this unit delivers constant current pulses between the electrode selected with
ELECTRODE SELECTOR (12) and the reference electrodes (see page 5).
*2 The external stimulus isolation unit(s) can be used to deliver monopolar pulses (mono-phasic or bi-phasic) pulses
between one of the 64 electrodes and the reference electrodes (as is the case for the internal stimulators). In this
scenario, the MED64 mini-plug is connected between the + or - output terminal and one probe electrode of your
choice using the Electrode Selector panel (12).
*3
The external stimulus isolation unit(s) can also be used to deliver true bipolar pulses between 2 electrodes of your
choice from the 64 available points.
