The SDM-AO4A includes four independent, continuous, analog outputs (CAO), which are used for proportional control or driving strip charts. Measured or processed values in the data logger are scaled to millivolts and transferred to the SDM-AO4A as digital values. The SDM-AO4A then performs a digital to analog conversion and outputs an analog voltage signal.
Benefits and Features
- Increases the number of CAO ports available to the data logger
- Supports both ±5 V and 0 to 10 V modes, allowing the module to be used in more applications
- Includes a choice of synchronous and sequential operation
The SDM-AO4A is designed to output four continuous voltages at levels set by a Campbell Scientific data logger. The data logger enables individual modules through an addressing scheme; multiple SDMs (in any combination) can be connected to one data logger. After a module is enabled, it operates independently of the data logger until additional commands are received or results are transmitted.
The SDM-AO4A can be operated in ±5 V mode or 10 V mode. In each of these modes, the SDM-AO4A can operate synchronously or sequentially. In synchronous mode, all channels are set at the same time.
| Function | Increases the number of continuous analog output (CAO) ports available to a data logger. CAOs are used for proportional control or driving strip charts. |
| Number of Channels | 4 |
| Operating Temperature | -40° to +60°C |
| Voltage Range | ±5 V or 0 to 10 V |
| Resolution | 167 µV |
| Operating Voltage | 12 Vdc nominal (9.6 to 16 Vdc) |
| Maximum Output Current |
|
| Overcurrent Shutdown Point | 130 mA ± 15 mA |
Accuracy with 20 kΩ Load (maximum)
| 25°C | ±(0.05% of |Vout(V)|+500µV) |
| -40° to +60°C | ±(0.1% of |Vout(V)|+500µV) |
Additional Full-Scale Error with 50 mA Load
| ±5 V Mode | -1.3 mV (typical) |
| 0 to 10 V Mode | -1.5 mV (typical) |
Typical Current Drain (±5 V Mode)
| No load, Vout=0, Vsupply=12V | 11 mA |
| No load, Vout=fullscale, Vsupply=12V | 13 mA |
| With load, Vsupply=12V | 13 mA + load |
| Power Down Mode, Vsupply=12V | 1.1 mA |
Typical Current Drain (0 to 10 V Mode)
| No load, Vout=0, Vsupply=12V | 21 mA |
| No load, Vout=fullscale, Vsupply=12V | 28 mA |
| With load, Vsupply=12V | 28 mA + (2.4)(load) |
| Power Down Mode, Vsupply=12V | 1.1 mA |
