Query and reture POSitive or NEGative as the format of characters.5.9.3 Trigger Level in Video Trigger.Command format:TRIGger:SEQuence:VIDeo:LEVel TRIGger:SEQuence:VIDeo:LEVel?Function description:Set trigger level in video trigger.Query trigger level in video trigger.This command is only valid when select video trigger.Parameter specificationlevel, floating-point data, range from -300.0dBm to 50 dBm.Return formatQuery and return trigger level value as the format of floating-point data.5.9.4 UNIT Subsystem• Select the power unit used for measurement.Command format:UNIT:POWer DBM|DBMV|DBUV|W|VUNIT:POWer?Function description:Set amplitude unit of Y-axis.Query amplitude unit of Y-axis.Return formatQuery and return DBM, DBMV, DBUV, W or V.5.10 SYSTem Subsystem5.10.1 Power off the Instrument.Command format:SYSTem:SHUTDOWNFunction description:This command is to power off this spectrum analyzer.5.10.2 Restart the InstrumentCommand format:SYSTem:RESTARTFunction description:This command is to restart the spectrum analyzer.
