Instrutech ITC-18/PCI, User Manual

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I
NSTRUTECH
C
ORPORATION
ITC-18/PCI U
SER
’
S
M
ANUAL
4
ADC inputs:
Eight BNC connectors provide access to the eight individual 16 bit analog to
digital converter input channels. Each A/D channel uses a high speed
programmable gain instrumentation amplifier to provide individually selectable
gain. Analog to digital converter channel selection and sampling interval
timing is controlled by the acquisition software. The ADC channels have an
input range of -10.24 to +10.23 volts. These channels are optically isolated
from the computer. These channels are differential inputs. If the BNC
connector shield is left unconnected unexpected results can occur. Use only
high quality 75 ohm BNC cables for optimal results. The absolute maximum
input range for these inputs is
±
40 volts. Do not exceed this level or damage
can result to the input circuitry.
5
SIGNAL GROUND connector:
A 3 mm banana receptacle provides connection to the internal analog ground.
This low noise ground is provided for connecting to the recording amplifier.
This ground connection is not connected to the
ITC-18 case or to the computer
power supply ground. . If desired, the user should provide an external
connection between the case and the instrument rack. The mating plug for this
connector is a Keystone Electronics Corporation part number 6077.
6
TTL digital inputs:
Four BNC connectors provide access to four out of the sixteen digital input
channels. The digital input channels are controlled by the acquisition software.
These digital input channels accept standard TTL levels (5 volts and 0 volts).
These channels are optically isolated from the computer The absolute
maximum voltage range for these inputs is -0.5 volts to +5.5 volts.
Do not
exceed this range or damage can result to the input circuitry.
7
TTL digital outputs:
Four BNC connectors provide access to four out of the sixteen digital output
channels. The status of the digital output channels are controlled by the
acquisition software. These digital channels output standard TTL levels (5
volts and 0 volts). These channels are optically isolated from the computer.
These channels are optically isolated from the computer. These channels are
optimized to drive 75 ohm BNC cables into an AC, HC, ACT, HCT or 8-TTL
load.
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