Category : Data Acquisition and signal processing > Data acquisition cards, equipment, systems

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Description:
The Model 4861A is a compact, IEEE-488.2/GPIB to Analog Interface that provides signals for controlling analog devices from the GPIB bus. The Model 4861A has four floating analog output channels, four differential analog inputs, digital output drivers and digital inputs. The analog values can be scaled to match the physical values of the input signals or of the controlled parameters.
The scale factors and all other user set configuration parameters are saved in flash memory until changed. The 4861A accepts both industry standard SCPI commands and easy-to-use short form commands. Typical 4861A applications are controlling power supplies, providing analog stimuli or measuring analog signals.
OEM board versions of the 4861A are available in a variety of configurations to match the analog control needs. The 4861A's firmware can be customized to add new commands or operate with an alternate language such as the MATE CIIL command set.

Analog Inputs:
The 4861A's analog inputs are four differential signals that multiplexed into a 12 bit A/D converter as unipolar or bipolar voltages. Each input has an individual 10, 1, or 0.1 volts full scale range setting. The analog inputs are scanned at 200s/sec rate and are internally averaged. The averaged readings can be reported as voltages or individually scaled to correspond to the measured parameter, i.e. volts, amps, watts etc. The analog inputs have 750 volts of isolation from digital ground
Analog Outputs:
The 4861A's analog outputs are individually isolated by 750 volts from digital ground. Channel 4 is referenced to the A/D converter ground. Each analog output can be individually set to a 0 to + 10, a 10, or to a 5 volt output range. Resolution is 1 part in 216. The analog outputs have separate range, scale factor, offset and limit values that the user can program to match the controlled application.
Digital I/O:
The Model 4861A provides four relay driver outputs and eight digital inputs. The digital outputs are open-collector darlington drivers that sink up to 300 mA . Output #4 can be used as a Fault Output signal to display error conditions. The digital input lines have pullup resistors and accept TTL/ CMOS levels or contact closure inputs. The 4861A can monitor the digital inputs and use the 488.2 status reporting structure to generate an SRQ (Service Request) when a change occurs.

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