FeelTechFY6600 Series User’s Manual 33Sweep TimeWhen Sweep function is enabled, press SOUR button to select it and press itagain to change between TIME and external sweep (VCO Sweep). Press theArrow buttons and rotate the ADJ Knob to set the specified value of weep time.The default is “10S”. The work range is 10mS~999.99S. For Example:SOUR: TIME 999.99SVCO (Voltage Control Output) SweepFunction instruction: External voltage can control signal output by ExternalSweep (VCO) function. It can realize voltage controlling frequency (VCF), voltagecontrolling amplitude (VCA), voltage controlling offset, voltage controlling dutycycle and so on.Operation method: Press [SWEEP] button to enter sweep function interface.Then press[F4 SOUR] button to switch the source to VCO IN. After Sweep Object,Start, End and Sweep Mode being set, connect the external signal from VCO INterminal on the back panel. Then press the ADJ knob (OK button) to enable VCOsweep function. Press ADJ knob (OK button) again to disable it.Note: Signal input for External Sweep (VCO) need to be input from VCO IN port ofback panel. Its frequency need to be less than 500 Hz and its voltage amplitudeneed to be among 0~5V.