BA-01X User Manual
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version 1.9
page 12
CURRENT INPUT unit
The CURRENT INPUT unit consists of (23) (25) on / off switches, (24)
1 nA/V connector and (26) 0.1 nA/V connector.
(23) on / off switch
Switch to enable (on) or disable (off) CURRENT INPUT via 1 nA/V connector.
To avoid interferences always switch to off position if the INPUT is not used.
(24) CURRENT INPUT 1 nA/V connector
Analog input BNC connector for application of signals from an external stimulus source.
The voltage signal that is connected here is transformed to a proportional current at the
electrode with a sensitivity of 1 nA/V, i.e. an input voltage of 5 V is transformed to an
output current of 5 nA. The signal form remains unchanged. Two examples are given in
Figure 3. The amplitude of the output current signal (current stimulus) is determined by the
amplitude of the input voltage signal.
input voltage signal
output current signal
Figure 3: input-output relation using CURRENT INPUT
(25) on / off switch
Switch to enable (on) or disable (off) CURRENT INPUT via 0.1 nA/V connector.
Hint: To avoid interferences always switch to off position if the INPUT is not used.
(26) CURRENT INPUT 0.1 nA/V connector
Analog input BNC connector for application of signals from an external stimulus source.
The voltage signal that is connected here is transformed to a proportional current at the
electrode with a sensitivity of 0.1 nA/V, i.e. an input voltage of 5 V is transformed to an
output current of 0.5 nA. The signal form remains unchanged (see also (24 and Figure 3).
Very Important: If switch #10 is set to x10, all current input signals are multiplied by the
factor of 10, i.e. STIMULUS INPUT 1 nA/V is then 10 nA/V and 0.1 nA/V is 1 nA/V,
respectively!!
Important: The current injected through the electrode is always the sum of the input signal
at CURRENT INPUT (24 or 26), the holding current set by HOLDING CURRENT (11)
and switch (12), and the gated stimulus set by STEP SIZE (28) and switch (27).
