Plexon Stimulator 2.0, Manual

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Neurotechnology Research Systems
© Plexon Inc - 53 -
7.7 Voltage Monitor
In stimulation mode, the voltage monitor outputs a voltage that is proportional to the voltage being
applied to the selected electrode. Refer to section 5.5, Verifying the output on an oscilloscope for
some examples. By default the Vmon scaling (see section 6.6.1) is set to 0.25 V/V and the voltage
monitor output is one fourth the actual voltage at the electrode. This setting is appropriate for
almost all electrodes. Note that the output range of the voltage monitor is ±3.25 V. If the Vmon
scaling is set higher than 0.25V/V, then the output of the voltage monitor will saturate before the
compliance limit is reached and the may not reflect the actual voltage at the electrode. For example,
with the Vmon scaling set to 2.5 V/V, the voltage monitor will saturate when the electrode voltage
is only ±1.3V, which is well below the maximum stimulator output voltage.
In Z test mode, the voltage monitor outputs a voltage that is proportional to the impedance of the
electrode. See sections 5.9, Impedance measurement, and 6.6, Vmon scaling and Z conversion, for
additional details.
Note that the outer contact of the voltage monitor BNC connector is connected to analog IO ground.
The outer contact of the BNC connectors on many oscilloscopes is connected to the AC wall outlet
ground. Therefore connecting a BNC cable between the voltage monitor output and an oscilloscope
will typically connect the stimulator analog IO ground to the AC wall outlet ground.
7.8 Stimulation Cable
The pinout for the stimulation cable with Plexon PN 14-03-A-03 is provided below for your
convenience.
1
–
Cha
nn
el
1
3
–
Cha
nn
el
3
5
–
Cha
nn
el
5
7
–
Cha
nn
el
7
9
–
NC
11
–Re
tur
n
1
13
–
NC
15
–
Cha
nn
el
9
17
–
Cha
nn
el
11
19
–
Cha
nn
el
13
21
–
Cha
nn
el
15
23
–
NC
25
–
Re
tur
n
2
2
– C
ha
nn
el
2
4
– C
ha
nn
el
4
6
– C
ha
nn
el
6
8
– C
ha
nn
el
8
10
– NC
12
– NC
14
– NC
16
– C
ha
nn
el
10
18
– C
ha
nn
el
12
20
– C
ha
nn
el
14
22
– C
ha
nn
el
16
24
– NC
26
– NC
A
1
–
Cha
nn
el
1
A2
–
C
ha
nn
el
2
A3
–
C
ha
nn
el
3
A4
–
C
ha
nn
el
4
A5
–
C
ha
nn
el
5
A6
–
C
ha
nn
el
6
A7
–
C
ha
nn
el
7
A8
–
C
ha
nn
el
8
A9
–
NC
A10
–
R
et
urn
1
B
1
– C
ha
nn
el
9
B
2
– C
ha
nn
el
10
B3
–
C
ha
nn
el
11
B
4
– C
ha
nn
el
12
B
5
– C
ha
nn
el
13
B
6
– C
ha
nn
el
14
B7
–
C
ha
nn
el
15
B
8
– C
ha
nn
el
16
B9
–
NC
B
10
–
R
eturn
2
391 mV @ V
MON
= 1.56 V @ electrode