Each DSCA49 voltage output module provides a single channel of analog output. The input signal is buffered, isolated, filtered and converted to a voltage output. Signal filtering is accomplished with a five-pole filter which provides 100dB per decade of attenuation above 1kHz. An anti-aliasing pole is located on the system side of the isolation barrier, and the other four poles are on the field side. After the initial system-side filtering, the input signal is chopped by a proprietary chopper circuit. Isolation is provided by transformer coupling, again using a proprietary technique to suppress transmission of common mode spikes or surges.
Special input circuits on the DSCA49 voltage output module provides protection against accidental connection of power-line voltages up to 240V AC and against transient events as defined by ANSI/IEEE C37.90.1. Protection circuits are also present on the signal output and power input terminals to guard against transient events and power reversal. Signal and power lines are secured to the DSCA49 voltage output module using screw terminals which are in pluggable terminal blocks for ease of system assembly and reconfiguration.