Lambda ZUP6-33 User Manual

Lambda ZUP6-33 User Manual Manual pdf 37 page image

4.4.11 Output Voltage Programming by external voltage4.4.12 Output Current Programming by external voltageCAUTIONCAUTIONFig. 4-7 shows the set-up for external voltage programming of the output voltage. A voltage sourcevariable from 0 to 4V, programs the output voltage proportionally from zero to full scale. The static loadcurrent on the programming source is less than 2uA. The source resistance should be less than10Kohm to avoid degradation of offset and drift specifications. When external voltage is used forprogramming the front panel and the computer control (via the serial communication) are disabled.Note: Full scale is 105% of the rated output voltage.Fig. 4-8 shows the set-up for external voltage programming of the output current. A voltage sourcevariable from 0 to 4V, programs the output current proportionally from zero to full scale. The static loadcurrent on the programming source is less than 2uA. The source resistance should be less than10Kohm to avoid degradation of offset and drift specifications.Note: Full scale is 105% of the rated output current.The Com pin at the external control connector is connected to the -Sense potential. NEVERconnect the Com pin (pin10) to any potential, as it may damage the power supply.Avoid connection of resistors greater than 4kohm or voltage greater than 4V for external resistoror voltage programming, as it may cause the output voltage and current to exceed the powersupply rating. The display will NOT show the actual voltage and current when such resistoror voltage is applied for programming.Fig. 4-7:Output voltage programmingby external voltage source.(ZUP rear panel view)Fig. 4-8:Output current programmingby external voltage source.(ZUP rear panel view)0~4VDCVoltagesource0~4VDCVoltagesource++__221414- LS- LS- S- S+LS+LS+S+SOn/OffOn/OffExternal control connectorExternal control connectorCOMCOMPPVRFVVRFVVCVPVCVPVRFIVRFIVCCPVCCPRCVPRCVPRCCPRCCP111313Output GoodOutput Good