Keysight Technologies E4360 Series User Manual

Also see for E4360 Series: Service guide Service guide

Contents

4 Using the Solar Array Simulator66 Series E4360 User’s GuideProgram the CurveProgram the SAS curve parameters as follows:Front Panel: SCPI Command:Select Output\SAS\Curve.Enter the curve parameters inthe Vmp, Voc, Imp, and Iscboxes.Press Set Curve to verify andenter the parameter values.To program Vmp, Voc, Imp, andIsc on the same program line:CURR:SAS:ISC 5,(@1);IMP 4.5,(@1);:VOLT:SAS:VOC 100,(@1);VMP 90,(@1)If you are programming an entirely new SAS curve, it is best to send allfour curve parameters on the same program line as shown above. Theinstrument checks whether all four parameters are within acceptablelimits. If a parameter is outside the limits, an execution error occurs andno new curve is programmed.When a single curve parameter is sent with a program line, it is checkedalong with the three unchanged parameters to determine whether theparameters and resulting curve are within acceptable limits. A curve isthen programmed using the new parameter.Output the CurveTo output the curve that was previously programmed:Front Panel: SCPI Command:Select the correct channel.Press the On/Off key.To run the curve on output 1:OUTP ON,(@1)NOTE When the unit detects invalid equation parameters, it will generate anerror, light the ERR annunciator on the front panel, and will not use thenew parameters. Instead, it will operate with the last valid settings.Therefore, although it may seem that the unit is operating correctly, itwill NOT be using the values that you have programmed for SAS mode.Curve RestrictionsUnder certain conditions, such as if Imp is significantly less than Isc, themodel equations described in Appendix A will exhibit a certain degree ofinaccuracy in that the actual maximum power point (Pmp) and value maybe somewhat different from the expected value of Pmp (Imp x Vmp).Thus the actual Pmp point may not occur at exactly the Imp x Vmp. Thiscan be corrected by entering new values for Imp and Vmp (see Figure A-1 in Appendix A).Note that the accuracy specifications in SAS mode are relative to thevalues given in the exponential equations, and not necessarily to theinput parameters Imp and Vmp. However, the Isc and Voc values arealways accurately given by the exponential equations.