Campbell 4-Channel Current/Voltage SDM-CVO4 Bedienungsanleitung PDF herunterladen (Seite 2)

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Campbell Scienti c

April 30, 2013

SDM-CVO4 Speci cations (Valid for a temperature range of -25° to +50°C, unless otherwise speci ed.

Power

Operating voltage: 12 Vdc nominal (8 to 16 V)

Current drain @ 12 Vdc:

Typical active quiescent current 27 or 54 mA,

depending on operating mode (no load on output

ports). 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.

The CVO4 draws <0.5 mA with all outputs o .

Voltage Mode Output

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 @ +23°C: ±0.02% of set voltage + (±2.5 mV)

Accuracy @ -25° to +50°C: ±0.13% of set voltage + (±2.5 mV)

Current Mode Output

Range: 0 to 20 mA

Resolution: 5 μA

Minimum output current (leakage): 5 μA at +50°C

Accuracy @ +23°C: ±0.02% of full scale range + (±5 μA)

Accuracy @ -25° to +50°C:

Typical: ±0.1% of full scale range + (±5 μA)

Worst case: ±0.15% of full scale range + (±5 μA)

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

Note: When in current mode, the V

terminal outputs an unregulated voltage

source at 15 V nominal (±10%), 30 mA maximum load.

Isolation

Description:

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).

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

datalogger ground, providing all issues relating to

local regulation for safe installation and operation

are followed (see Operator’s Manual Section 4.5,

Safety Issues)

Environmental

Operating temperature:

-25° to +50°C standard;

-40° to 80°C extended (available on special order)

Humidity: non-condensing

Physical

Dimensions:

17.6 x 11.1 x 2.4 cm (6.9” x 4.4” x 0.94”);

23.4 x 11.1 x 2. 4 cm (9.2” x 4.4” x 0.94”) when

 tted with mounting brackets for enclosure.

The mounting bracket holes are spaced 20.3 cm (8”) apart

for attachment to an enclosure backplate.

Weight: 0.370 kg (13 oz.)

EMC Status:

Complies with EN55022-1:1998 and EN50082-1:1998

Power considerations

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 .

1 2

SDM-CVO4 1
Power considerations 2

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