Campbell SDM-CVO4 Features

COMPONENTS

SDM-CVO4

Current/Voltage Output Module

Lets Datalogger

Control Voltage

Expands datalogger’s current/

voltage output capability

Overview

The SDM-CVO4 is attached to a datalogger and outputs variable
voltage or current signals under datalogger program control. Typi­cal applications include driving remote current-loop display units,

Benets and Features

Expands datalogger current/voltage output capability
Provides four independent current or voltage outputs
Drives remote current-loop display units

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 cur­rent 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.

retransmitting measured values to industrial control systems,
sending control signals to valve controllers, and providing excita­tion voltages or currents to external sensors.

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

Isolation

The SDM-CVO4 includes an internal isolation barrier and com­ponents 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).

questions & quotes: 435.227.9000

www.campbellsci.com/sdm-cvo4

Power Considerations

Campbell Scientic, Inc.

815 W 1800 N

Logan, UT 84321-1784

[phone]

www.campbellsci.com

The SDM-CVO4 power requirements are large compared to most
Campbell Scientic products—especially when driving signi­cant loads. Care must be taken to ensure the power supply can
deliver this higher demand. Alkaline batteries are not recom­mended for long-term applications.

The SDM-CVO4 has two internal power supplies—one for chan­nels 1 and 2 and one for channels 3 and 4. The power supply
for channels 3 and 4 is only turned on if the datalogger sends an
instruction that sets the output of those channels. If channels 3
and 4 are not used, the power consumption is approximately
20 mA lower than when all outputs are used.

Where supported by the datalogger, and when the application
allows it, the SDM-CVO4 can be shut down to reduce its power
consumption to less than 0.5 mA. In this state, all outputs are
switched o.

Specications

Weight: 363 g (13 oz)
Dimensions

Without Mounts: 17.8 x 10.2 x 2.3 cm (7.0 x 4.0 x 0.9 in)
With Mounts: 23.4 x 11.2 x 2.3 cm (9.2 x 4.4 x 0.9 in)

Surge: Complies with IEC61000-4-5, test level 3 (±2 kV, 2 Ω
coupling impedance)

Operating Temperature: -25 to +50°C
Operating Voltage: 12 Vdc nominal (8 to 16 V)
Minimum Voltage Drop Across The Internal Current Regulating

Circuit: 2.5 V @ 20 mA current ow
Maximum Input Voltage Relative To Channel Ground: 20 Vdc
EMC Status: Complies with EN55022-1:1998 and EN50082-1:1998

Ordering Information

Synchronous Device for Measurement

SDM-CVO4 4-Channel Current and Voltage Output Module

SDM-to-Datalogger Cable

CABLE5CBL-L 5-conductor, 24 AWG cable with drain wire and Santoprene

Cable Termination Options (choose one)

Current Drain @ 12 Vdc

Typical Active Current: 27 or 54 mA, depending on operating
mode (no load on output ports)

With All Outputs O: < 0.5 mA

Current Mode

Range: 0 to 20,000 µA
Resolution: 5 µA
Accuracy at +23°C: ±0.02% of set current + (±5 µA)
Typical Accuracy at -25° to +50°C: ±0.1% of set current + (±5 µA)
Worst Case Accuracy at -25° to +50°C:

±0.15% of full scale range + (±5 µA)

jacket. Enter cable length, in feet, after the -L. Must choose a
cable termination option (see below).

-PT Cable terminates in stripped and tinned leads for direct

connection to a datalogger’s terminals.

-PW Cable terminates in connector for attachment to a

prewired enclosure.

b

Isolation

Tested Isolation: Each channel of each unit is tested for isola­tion resistance at 500 Vdc. Pass level > 10 MΩ

Maximum Recommended Continuous Operating Voltage:
240 Vac rms dierential between an output and the data­logger ground

a

Maximum recommended continuous operating voltage assumes all issues relating to local regulations for safe installation and operation are followed (see

Operator’s Manual Section 4.5, Safety Issues).

b

To estimate the total current, add the quiescent current to the sum of all output currents multiplied by 1.5. For example, if each port is at 10 mA output,

the total = 54 + (1.5•4•10) = 114 mA.

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a

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Voltage Mode

Range: 0 to 10,000 mV
Resolution: 2.5 mV
Maximum Output Current: 30 mA per channel
Minimum Load Current: 5 µA if output < 200 mV
Accuracy at +23°C: ±0.02% of set voltage + (±2.5 mV)
Typical Accuracy at -25° to +50°C:

±0.13% of set voltage + (±2.5 mV)

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© 2001, 2013

Campbell Scientic, Inc.

October 17, 2013