Campbell SDM-CVO4 Features

COMPONENTS

SDM-CVO4

Current/Voltage Output Module

Lets Datalogger 

Control Voltage

Expands datalogger’s current/

voltage output capability

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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

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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).