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OMB-DaqBook User’s Manual
01-23-02 DaqBook Hardware 3-5
Reference Note:
The Power Management section of the DBK Option Cards and Modules User’s Manual
(p/n OMB-457-0905) contains additional power-related information. As a part of product
support, this manual is automatically loaded onto your hard drive during software installation.
The default location is the Programs directory, which can be accessed through the Windows
Desktop.
DAC Reference Selection (JP2)
This 5×2 header (JP2) allows you to select internal or external voltage references for the two separate
analog outputs. If the internal -5 VDC reference is selected, either DAC can output from 0 to +5 VDC as
the register count varies from 0 to 4095 (12-bit). If an external voltage reference is desired (up to +10
VDC or –10 VDC), the shunt jumpers must be set accordingly. There is also a provision to allow the
outputting of a simultaneous Sample-Hold command signal on the DAC1-REFIN pin with the DAC1 set
up for an internal reference.
CAUTION
The SSH setting cannot be used at the same time as a DAC1 external reference due to a
potentially damaging conflict on P1 pin #26. The defaults are both DAC0 and DAC1
set to Internal Reference.
Note: The SSH setting is used with DBK2, DBK4, DBK5, DBK7, DBK17, DBK50, and DBK51.
Refer to the DBK options manual (p/n 457-0905) as needed.
JP2 JP2 JP2
JP2
JP2
Factory Default
DAC0 External Ref
DAC1 External Ref
DAC0 External Ref
DAC1 Internal Ref
DAC0 Internal Ref
DAC1 External Ref
DAC0 Internal Ref
DAC1 Internal Ref
DAC0 External Ref
DAC1 Internal Ref
with SSH
DAC0 Internal Ref
DAC1 Internal Ref
with SSH
EXT
INT
SSH
INT
EXT
DAC1
DAC0
JP2
JP2 DAC Reference Settings