Operating Manual Vol 1 - ES Documentation

SMIQDigital Modulation(CLOCK...) CLOCK SOURCE Selection of clock sourceINT The symbol and the bit clock in SMIQare generated by a clock synthesizer onthe modulation coder. All the clocksignals are synchronized to the 10-MHzreference of the unit.IEEE-bus :SOUR:DM:CLOC:SOUR INTCOUPLED The clock comes from the same sourceas the data.IEEE-bus :SOUR:DM:CLOC:SOUR COUPEXT An external clock signal is fed externally.The clock synthesizer on the modulationcoder is synchronized to this clock.Parameter SYMBOL RATE has to becorrectly set with an accuracy of ± 1 %.IEEE-bus :SOUR:DM:CLOC:SOUR EXTMODEDELAYSelection of clock for the external clock signalSYMBOL An externally fed clock has to be asymbol clock.BIT An externally fed clock has to be a bitclock.IEC/IEEE-bus :SOUR:DM:CLOC:MODE SYMBInput value of delay of generated modulation signalcompared with an externally fed clock. This can beused, for example, for synchronization with a secondunit to achieve time synchroneity between themodulation signals of the two units. The displayedsetting resolution of 1/100 symbol is only attained forsymbol-clock frequencies below 100 kHz. The actualresolution is reduced with increasing frequency. Thedelay can no longer be set for 7 Msymb/sIEC/IEEE-bus :SOUR:DM:CLOC:DEL 0.5POWER RAMPCONTROL...Opens a window for setting the envelope control.1125.5555.03 2.111E-9