COMPONENTS
SDM-CVO4
Current/Voltage Output Module
Lets Datalogger
Control Voltage
Expands datalogger’s current/
voltage output capability
www.campbellsci.com/sdm-cvo4
Overview
The SDM-CVO4 is attached to a datalogger and outputs variable
voltage or current signals under datalogger program control. Typi-
cal applications include driving remote current-loop display units,
retransmitting measured values to industrial control systems,
sending control signals to valve controllers, and providing excita-
tion voltages or currents to external sensors.
Benefits and Features
Expands datalogger current/voltage output capability
Provides four independent current or voltage outputs
Drives remote current-loop display units
Retransmits measured values to industrial control systems that
have current or high voltage inputs
Sends control signals to valve controllers
Provides excitation voltages or currents to external sensors
questions & quotes:
435.227.9000
Technical Description
The SDM-CVO4 includes four output channels for connecting
the external devices. It outputs variable voltage or current signals
under datalogger program control. The outputs are isolated both
from the datalogger and the other channels on the SDM-CVO4,
thereby avoiding ground loop problems. Each output can be set
to 0 to 10 Vdc or 0 to 20 mA by the datalogger program (current
outputs can also be scaled and limited to 4 to 20 mA).
In the current mode, the output either acts as a two-wire cur-
rent controller, where the loop is powered from a remote voltage
source, or generates a 0 to 20 mA current source using a voltage
output derived from its own power supply.
Isolation
The SDM-CVO4 includes an internal isolation barrier and com-
ponents rated to provide signal isolation for transients up to
1500 Vac (rms), 2500 Vdc nominal. The isolation is between any
output and the SDM-CVO4 ground connection and between
individual output channels.
Protection components are built-in, which will break down in a
controlled fashion at voltages close to this limit (see Operator’s
Manual Section 4.5, Safety Issues, for details).
