General
The VXI600 instruments are single, double,or triple output power supplies on C-size card formats. The VXI600 is a messagebased device for ease of programming. Andbecause input AC or DC power enters directlyinto the front of the card, no special back-plane modifications or backplane power suppliesare needed. Each instrument contains an on-board microprocessor for communications andcontrol over the VXIbus backplane, as well asnon-volatile memory for storage of calibrationdata, default settings, and other sequencingparameters.

The modular VXI architecture allows ATE size,weight, and cost to be reduced while increasingoverall test station MTBF. These advantagesresult from the elimination of duplicate hard-ware elements found in conventional rack-and-stack systems. The VXI600 supplies eliminateredundant IEEE-488 control boards, logic powersupplies, and front panel switches and knobs.Excess mechanical hardware (e.g. sheet metaland fans) found in conventional rack-and-stacksupplies is also avoided.

Packaging

The VXI600 supplies are packaged as standardVXIbus dual-slot C-size cards. Eachinstrument is comprised of five functionalsections. The VXI Interface and Input PowerConditioning sections are common to all VXI600models. These sections provide the necessarycontrol circuitry for communications over thebackplane, and provide input AC power factorcorrection circuitry and EMI filtering.

The remaining three sections are independentand isolated Output Power Stages. Eachoutput stage may be customer selected from20VDC or 60VDC modules. Each output stageis rated at 200W continous output power.

SCPI Compatability
The instrument recognizes commands utilizedby the industry standard SCPI (StandardCommands for Programmable Instruments).Thus, programming is consistent with othermajor power suppliy manufacturers forinteroperability, as well as simplifyingprogramming and reducing tets programdevelopment times.

Power Factor Correction
The VXI600 supplies have been designed to inter-face with worldwide AC mains with nearly unitypower factor. Both 115VAC and 230VAC modelsare available (DC input optional). In additionto EMI filtering and transient protection, theinstrument includes input power factor correctioncircuits.


Parallelable Outputs
To provide for the maximum flexibility in meetinga broad range of UUT power requirements, LIKE outputstages may be used in parallel. For example, andinstrument configured with three 200W output stagesmay be used as a triple output supply or as a single600W supply - completely under software control.

Output Sequencing
Output sequencing is provided by means of 20 program-able memory stages for voltage level and dwell times.Sequencing can be incremented via SCPI commands or maybe stepped through via SCPI 'trigger' commands.

Cooling / EMI
The VXI600 supplies are fully enclosed and shieldedto eliminate electromagnetic interference, and toprovide for controlled airflow. The instruments aredesigned to comply with all VXIbus specifications forclose-field and far-field radiated emissions and susceptability. In addition, each output stage con-tains miniature cooling fans to ensure adequatecooling air even in instances where adjacent VXIslots are vacant.

Self Test
Both continous Build-In-Test and On-Command Selftestcapability are included to provide protection toboth the VXI600 and to the UUT. The BIT programcontinuously monitors various fault flags and userprogrammable protection circuits. If a failure isdetected, appropriate action is automatically takenby the onboard microprocessor.