7 FETCh Subsystem134 Keysight U2040 X-Series Programming GuideFETCh[1]|2|3|4[:SCALar][:POWer][:AC]:RATio?SyntaxFETCh[1]|2|3|4[:SCALar][:POWer][:AC]:RATio?[[,[,]]]DescriptionThis query sets the specified CALCulate block measurement function to power ratio withrelative mode off, recalculates the measurement, and places the results on the bus. Theresult is a ratio-based measurement and is expressed in the units defined byUNIT[1]|2|3|4:POWer:RATio.ParametersExampleItem Range of values Description/Default valueexpected_value(for the expected powerlevel)sensor-dependentDEF[a][a] The mnemonic DEF means DEFault. This is not equivalent to the DEFault parameter used in the commandsubsystems. The parameters must be entered in the specified order. If parameters are omitted, they default from theright. The parameter DEFault is used as a placeholder. Specifying DEF leaves the parameter value unchanged.The expected power level parameter can be set to DEF or anumeric value. If a value is entered, it should correspond tothat set by CONFigure otherwise an error occurs. The unitsof measurement are dBm and W. The default units aredefined by UNIT:POWer.resolution1 to 4[b]1.0, 0.1, 0.01, 0.001DEF[a][b] When SENS:AVER:COUN:AUTO is enabled, the resolution setting affects the number of averages applied. Refer to“Auto-averaging mode” on page 44 for more information.A numeric value for the resolution. If it is unspecified, thecurrent resolution setting is used. If a value is entered, itshould correspond to the current resolution setting otherwisean error occurs.source_list (@1),(@1)This channel list specifies the channels used tocalculate the ratio. If unspecified and the current setup is aratio measurement, then this ratio setup is used,otherwise it defaults to Channel A/A.FETC2:RAT? DEF,1,(@1),(@1)Queries the CALCulate2 ratio measurement ofChannel A over Channel A, using the currentrange and a resolution of 1.
