© 2001, 2013
Campbell Scientific, Inc.
October 17, 2013
Power Considerations
The SDM-CVO4 power requirements are large compared to most
Campbell Scientific products—especially when driving signifi-
cant loads. Care must be taken to ensure the power supply can
deliver this higher demand. Alkaline batteries are not recom-
mended for long-term applications.
The SDM-CVO4 has two internal power supplies—one for chan-
nels 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 off.
Campbell Scientific, Inc.
|
815 W 1800 N
|
Logan, UT 84321-1784
|
(435) 227-9000
|
www.campbellsci.com
USA | AUSTRALIA | BRAZIL | CANADA | CHINA | COSTA RICA | ENGLAND | FRANCE | GERMANY | SOUTH AFRICA | SPAIN
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
jacket. Enter cable length, in feet, after the -L. Must choose a
cable termination option (see below).
Cable Termination Options (choose one)
-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.
Specifications
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 flow
Maximum Input Voltage Relative To Channel Ground: 20 Vdc
EMC Status: Complies with EN55022-1:1998 and EN50082-1:1998
Isolation
Tested Isolation: Each channel of each unit is tested for isola-
tion resistance at 500 Vdc. Pass level > 10 MΩ
Maximum Recommended Continuous Operating Voltage:
a
240 Vac rms differential between an output and the data-
logger ground
Current Drain @ 12 Vdc
b
Typical Active Current: 27 or 54 mA, depending on operating
mode (no load on output ports)
With All Outputs Off: < 0.5 mA
Current Mode
Range: 0 to 20,000 µA
Resolution: 5 µA
Accuracy at +23°C: ±0.02% of set c (±5 µA)
Typical Accuracy at -25° to +50°C: ±0.1% of set c (±5 µA)
Worst Case Accuracy at -25° to +50°C:
±0.15% of full scale range + (±5 µA)
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 v (±2.5 mV)
Typical Accuracy at -25° to +50°C:
±0.13% of set v (±2.5 mV)
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.
