ADInstruments PowerLab 2/20, Руководство пользователя

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24 PowerLab Owner’s Guide
The Analog Output
The analog outputs provide computer-controlled variable outputs
(
±
10 V) that can be used with the Chart and Scope applications either
directly as a stimulator, or to control peripheral devices. All
stimulation voltage is generated by the PowerLab via the output
sockets on the front of the PowerLab (marked ‘Output’), giving
positive, negative, or differential stimuli, depending on the sockets
used and the software settings.
The outputs produce complementary (differential) stimulation. When
the positive (+) output is used, a positive stimulus voltage (set up in
an application) gives a positive voltage output, and a negative
voltage a negative one. When the negative (–) output is used, the
voltage outputs are inverted. When both output sockets are used, the
stimulus is the difference between the voltages at the positive and
negative outputs: you could generate up to a 20-volt pulse, given a
±
10 V stimulus.
Connections
This section of the appendix contains ‘pinout’ and electrical details of
some of the connectors fitted to the PowerLab. You should read it
carefully before attempting to connect cables other than those
supplied with the unit to the PowerLab. Using cables that are wired
incorrectly can cause internal damage to the PowerLab and will void
your rights under warranty.
USB Port
The PowerLab is fitted with a USB (universal serial bus) port, which
is used to connect to a computer with built-in USB or a PCI USB card
installed. USB needs a Power Macintosh with Mac OS 8.5 or later, or a
PC with Windows 98 or 2000 or later.
Ground
From DAC
+
–
+10 V
–10 V
+10 V
–10 V
Figure A–7
The analog output stage, set
up for a differential stimulus.