National Instruments BNC-208 Series, Руководство пользователя

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Chapter 3 BNC-2081 Board
© National Instruments Corporation 3-5 BNC-208X Series User Manual
Fuse and Power LED
The +5-V line from the data acquisition board is protected by a 750-mA fuse. If the red power LED
does not light when the data acquisition board is powered on, check the 750-mA fuse on the BNC-2081
board and the output fuse (if any) on the Lab data acquisition board. Information on power connection is
given in Chapter 4,
Installation and Connections
.
Digital and Timing Signals
All of the signals from the Lab data acquisition board are made available either by BNC connectors or
via solder holes on the BNC-2081 board. Because these signals are not conditioned or changed in any
way by this board, refer to your Lab board user manual for information on the use of these signals. If
you want screw terminal access to all signals, a National Instruments SC-2071 board can be used in
conjunction with the BNC-2081 board. If you want optical isolation of or relay control by the digital I/O
lines, you must use a National Instruments SC-2053 cable adapter board and the appropriate SC-206X
Series digital signal conditioning board. For more information on these products, refer to either your
National Instruments catalog, the
SC-205X Series User Manual,
the
SC-206X Series User Manual
, or
the
SC-207X Series User Manual
.
Specifications
This section lists the specifications of the BNC-2081 analog breakout board. These ratings are typical at
25
°
C unless otherwise stated. The operating temperature range for this board is 0
°
to
70
°
C.
Analog Input
Number of channels Eight single-ended
Field connections 15 BNC connectors
Signal conditioning capability Four open component positions per channel that
include connections from the input to ground, +5 V,
and a series connection to the input of the data
acquisition board
Other signals Solder holes for remaining Lab board
I/O signals
DIO connector DIO-24 connector for digital ports
Power Requirements
Power consumption (at +5 VDC
±
5%)
Typical 12 mA with no user circuitry connected
Maximum 750 mA from host computer