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4-Channel Current Output Card for OMB-DAQBOARD-2000 Series
TRODEKS Engineering | Thermocouples, Pressure Transducers, Flow Meters, PID Controllers
  • Provides Four Isolated 4 to 20 mACurrent Outputs
  • Compatible With 12 To 45V Current Loop Supplies
  • Features PredictablePower-On & Fault States
  • Provides 12-Bit Resolution
 Manuals (contact with email : [email protected])


The OMB-DBK5 current-outputcard provides OMB-DAQBOARD-2000Series data acquisitionsystems with the ability to controlfour isolated 4 to 20 mA currentloops. The OMB-DBK5 acts as acurrent loop transmitter bymodulating current from an externalsource. The OMB-DBK5 can beprogrammed with a static valuewhenever the data acquisitionsystem is not transferring A/D data.As many as sixty-four OMB-DBK5’scan be used in one system, toobtain up to 256 outputs.

Each of the OMB-DBK5’s channelscontains a 12-bit D/A converter toset the loop current. All channelsare optically isolated from the dataacquisition system and from oneanother by 500 V.

Current Loop
The OMB-DBK5 is compatible withregulated or unregulated loopsupplies of 12 to 45 Vdc. It alsoprovides compliance with loopresistances of up to 1950 ohms,depending on the source magnitude.

Current Loop-Powered Outputs
Since the isolated outputs of theOMB-DBK5 are loop powered, thecard maintains control of the loopcurrent even when the dataacquisition system is powered down.When loop power is first applied, theOMB-DBK5’s outputs assume their4 mA default state. If at any time thedata acquisition system’s power islost or communication with the dataacquisition system fails, theOMB-DBK5’s outputs retain theirlast set values.


DB37 male, mates with P1pinout on OMB-DAQBOARD-2000Series; screw terminals for signaloutputs
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
@ Vexc = 35 V; MDR* = 1450 Ohms
@ Vexc = 15 V; MDR* = 450 Ohms
* MDR (maximum drive resistance)
Cables: Use OMB-CA-37-x withOMB-DAQBOARD-2000 Series
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