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ALSTOM MVAJ21L1GB0771B CPU module

ALSTOM MVAJ21L1GB0771B CPU module

ALSTOM MVAJ21L1GB0771B CPU module

The measurement, or readback, of the power supply's output voltage and current is accomplished by a high resolution A/D converter. To allow for software trimming of the readback levels the input to the A/D is pulled up slightly above zero and the full scale range slightly exceeds the actual signal to be measured. By taking a "snapshot" of the voltage and current sense signal at their zero and full scale points the RSTL can calculate all measured values. There are four commands used to take this snapshot; they must only be used when the output of the supply is at the appropriate level.

VOLTAGE READBACK ZERO:

Set the voltage output of the supply to zero using the "PV" command or equivalent. Send the command "TRVO". This will store the voltage readback offset value in the EEPROM for later use in readback calculations. VOLTAGE READBACK FULL SCALE: Set the voltage output of the supply to full scale using the "PV" command or equivalent. Send the command "TRVG". This will store the voltage read gain value in the EEPROM for later use in readback calculations

                                    

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