Omega Products OMB-DBK5 User Manual
H
Ordering Example: OMB-DBK5 4-channel current output card, $519
Provides Four
Isolated 4 to 20 mA
Current Outputs
Compatible with 12 to 45 V
Current Loop Supplies
Features Predictable
Power-On & Fault States
Provides 12-Bit Resolution
The OMB-DBK5 current-output
card provides OMB-DAQBOARD2000 Series data acquisition
systems with the ability to control
four isolated 4 to 20 mA current
loops. The OMB-DBK5 acts as a
current loop transmitter by
modulating current from an external
source. The OMB-DBK5 can be
programmed with a static value
whenever the data acquisition
system is not transferring A/D data.
As many as sixty-four OMB-DBK5’s
can be used in one system, to
obtain up to 256 outputs.
Architecture
Each of the OMB-DBK5’s channels
contains a 12-bit D/A converter to
set the loop current. All channels
are optically isolated from the data
acquisition system and from one
another by 500 V.
Current Loop
The OMB-DBK5 is compatible with
regulated or unregulated loop
supplies of 12 to 45 Vdc. It also
provides compliance with loop
resistances of up to 1950 ohms,
depending on the source magnitude.
Current
Loop-Powered Outputs
Since the isolated outputs of the
OMB-DBK5 are loop powered, the
card maintains control of the loop
current even when the data
acquisition system is powered down.
When loop power is first applied, the
OMB-DBK5’s outputs assume their
4 mA default state. If at any time the
data acquisition system’s power is
lost or communication with the data
acquisition system fails, the
OMB-DBK5’s outputs retain their
last set values.
Specifications
Connectors:
DB37 male, mates with P1
pinout on OMB-DAQBOARDS-2000
Series; screw terminals for signal
outputs
Accuracy/Linearity:
0.1% full scale
Resolution:
4 µA/LSB, monotonic
Isolation: 500 V
Voltage Range:
V
loop
= 12 to 45 V
Compliance:
R
loop
= (V
loop
- 6) / 0.020
Example Voltage MDR*
@ Vexc = 35 V 1450 Ohms
@ Vexc = 15 V 450 Ohms
* MDR (maximum drive resistance)
Cables:
Use OMB-CA-37-x with
OMB-DAQBOARD-2000 Series
OMB-DBK5, $519, current-output card controls four isolated 4 to 20 mA current loops,
shown smaller than actual size
OMB-DBK5
4-Channel Current Output Card
for OMB-DAQBOARD-2000 Series
To Order (Specify Model Number)
Model Number Price Description
OMB-DBK5 $519 4-channel current output card
H-60
Model OMB-DBK5
$
519
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