Data Translation DT9820 Series, Руководство пользователя

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Chapter 1
2
Features
The DT9820 Series is a high-resolution (24-bit) family of data
acquisition modules for the Universal Serial Bus (USB). USB is a new
standard for connecting PCs to peripheral devices, such as printers,
mice, and modems, and was developed to make more low-cost ports
available for the increasing number of these devices.
Most new computers have two USB ports that allow direct
connection to USB devices. You can expand the number of USB
devices attached to a single USB port by using expansion hubs.
DT9820 Series function modules are part of the high-power,
bus-powered USB class; therefore, the modules do not require
external power, but the expansion hubs do require external power.
DT9820 Series function modules reside outside of the PC and install
with a single cable to ease installation. Modules can be “hot
swapped” or plugged and unplugged while the PC is on, making
them useful for many data acquisition applications.
The DT9820 Series includes the DT9821 and DT9822. Table 1 lists the
key features of each module.
Table 1: Key Features Among the DT9820 Series
Function
Modules
# of Analog
Inputs
Analog Input
Sample Rate
# of Analog
Outputs
# of Digital
I/O Lines 60 Hz 50 Hz
DT9821 4 with 24-bit
resolution
a
a. The channels are configured as differential.
960 Hz 800 Hz 0 8 input
b
,
8 output
b. Digital input lines 0 to 3 can be used to start A/D conversions. Digital input lines 4 to 7 can
be used to stop A/D conversions.
DT9822 4 with 24-bit
resolution
a
960 Hz 800 Hz 2, 16-bit
resolution
8 input
b
,
8 output