Operating Manual Vol 1 - ES Documentation

SMIQDigital Modulation(POWER RAMPCONTROL...)RAMP FUNCTIONDetermines the shape of the rising and falling edgeduring envelope control by means of theBURST GATE signal.LIN Selection of a linear ramp function.COS The edge is shaped according to acosine function and a more favourablespectrum than that under setting LIN isobtained.IEC/IEEE-bus :SOUR:DM:PRAM:SHAP COSRAMP DELAYInput value for a shift of the envelope characteristicto the modulated signal. A positive value causes adelay of the envelope. The values are set in the unitsof the symbol length.IEC/IEEE-bus :SOUR:DM:PRAM:DEL 0.1ATTENUATIONInput value of level reduction in dB with digital controlsignal LEV ATT used. This function is normally used- for TDMA frame structures - to generate a slot withreduced level.IEC/IEEE-bus :SOUR:DM:PRAM:ATT 0 dBEXT INPUTSOpens a window for setting the trigger threshold, input impedance and polarityof the external digital modulation coder inputs, ie connector PAR DATA andinputs DATA, BIT CLOCK and SYMBOL CLOCK.FREQ100. 000 000 0 MHzLEVELPEP-30.0 dBm- 27.6 dBmΠ/4DQPSKFREQUENCYLEVELANALOG MODVECTOR MODDIGITAL MODDIGITAL STDLF OUTPUTSWEEPLISTMEM SEQUTILITIESMODULATIONSYMBOL RATFILTER...CODING...TRIGGER MOEXECUTE TRTRIGGER...CLOCK...POWER RAMPLOW DISTOREXT INPUTSTHRESHOLDIMPEDANCECLOCK SLOPETRIGGER SLOPE+1.0 V1kΩ /GND 50Ω/GND 50Ω/-2VPOS NEGPOS NEGFig. 2-68DIGITAL MOD - EXT INPUTS menu, SMIQ equipped with option Modulation CoderSMIQB20 and option Data Generator SMIQB11(EXT INPUTS...) TRESHOLD Input value of high/low threshold in Volt.IEC/IEEE-bus command :SOUR:DM:THR 1.01125.5555.03 2.113E-9