GEC ALSTHOM MCHN02D1AB0005A Channel isolation card

The RSTL board is factory installed within the ESS power supply. The RSTL communicates via the General Purpose Interface Bus (GPIB) or the RS232C serial communications link. The RSTL allows remote duplication of the power supply manual operating modes. Front panel controls are locked out when the user places the power supply in REMOTE mode. Programming of the Voltage and Current channels is via 12 bit D/A converters. The offset (zero) and gain (span) trimming of the programming signals is accomplished by 4 8-bit D/A's pumping current into the programming loop. The values used to trim the unit are stored in EEPROM in the microcontroller. At power up the trim levels are restored.

Readback is via a 21-bit A/D converter. 

The software routines used for calibration "use up" some of this resolution, leaving an apparent 16-bit resolution. This is more accurate than needed for the great majority of supplies. Trim adjustments for OFFSET and GAIN, in both Voltage and Current channels, for PROGRAM and READBACK are implemented in software. Readback trim settings may be disabled at any time, the default mode at power up is TRIM ON. Trim settings are stored in nonvolatile EEPROM address space.

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