Omega Engineering OMB-DBK-34A, User Manual

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DaqBook/100 Series & /200 Series and DaqBoard [ISA type] Configuration
Several setup steps of DaqBooks /100
Series & /200 Series devices and
DaqBoards [ISA type] are required to use
DBK4 cards in a system. Note that the
Daq PC-Card is configured in software; it
cannot supply power to DBKs.
1. If not using auxiliary power, place
the JP1 jumper in the expanded
analog mode (Analog Option Card
Use). In this mode jumpers are at
JP1’s –15 V and +15 V positions.
Note : This default position is necessary
to power the interface circuitry of
the DBK4 via the internal ±15
VDC power supply. If using
auxiliary power DBK32A or
DBK33, you must remove both
JP1 jumpers.
The DBK4 is power intensive ; refer to the DBK4 Power Notice (DBK4 page 2) and to
Power Requirements in the DBK Basics section near the front of this manual.
DaqBook/100 & /200 & DaqBoard [ISA]
Settings for the DBK4
2. Place the JP2 jumper in the SSH position.
CAUTION
When using the SSH output, do not use an external voltage reference for DAC1.
Applying an external voltage reference for DAC1, when using the SSH output, will
result in equipment damage due to a conflict on P1, pin #26.
3. For DaqBook/100, DaqBook/112 and DaqBook/120 only , place the JP3 jumpers in bipolar mode.
4. For DaqBook/100, DaqBook/112 and DaqBook/120 only , place the JP4 jumpers in single-ended
mode.
DaqBook/2000 Series & DaqBoard/2000 Series
No jumper configurations are required for these /2000 series devices.
Software Setup
Reference Notes :
o
DaqView users - Refer to the chapter 2, DBK Setup in DaqView .
o LogView users - Refer to the chapter 3, DBK Setup in LogView .
Hardware Description
Current Source (Transducer Biasing)
Each channel has a constant-current source that can be jumper-set to 2 mA or 4 mA. The bias current is
sourced through the center conductor of a coaxial lead and returns to the DBK4 from the transducer’s case
via the outer conductor. The current source provides a dynamic load of more than 1.4 M
Ω
and has a
negligible loading effect on the transducer’s output. If bias is not required, removing a jumper and
coupling the signals directly to the input preamplifier can disable the current source.
Note : Use the 4 mA for long cables, high peak voltages, and high signal frequencies.
DBK Option Cards and Modules
958293
DBK4, pg. 7