Agilent 33120A User's Guide

Chapter 4 Remote Interface ReferenceUsing the APPLy Commandœ Possible Conflict with Function Change: The output amplitude isautomatically adjusted if you select a function whose maximumamplitude is less than that of the currently active function. Thisconflict may arise when the output units are Vrms or dBm due to thedifferences in crest factor for the output functions. For example, if yououtput a 5 Vrms square wave (into 50 ohms) and then change thefunction to sine wave, the function generator will adjust the outputamplitude to 3.535 Vrms (the upper limit for sine waves in Vrms).From the remote interface, a -221, “Settings conflict” error is generatedand the amplitude is adjusted.œ Output Amplitude and Output Termination: The output amplitude isautomatically adjusted (and no error is generated) if you change theoutput termination. For example, if you set the amplitude to 10 Vppand then change the termination from 50 ohms to “high impedance”,the displayed amplitude will double to 20 Vpp. If you change from“high impedance” to 50 ohms, the displayed amplitude will drop in half.See “Output Termination” on page 65 for more information.œ A momentary glitch occurs in the output waveform at certainvoltages due to output attenuator switching. This positive-goingglitch occurs when the output voltage crosses the break-point voltageeither from a lower voltage or a higher voltage. The voltages areshown below (for a 0 volt dc offset):4252 mVpp, 399 mVpp, 502 mVpp, 796 mVpp, 1 Vpp, 1.59 Vpp,2.0 Vpp, 3.17 Vpp, 3.99 Vpp, 6.32 Vpp, 7.96 Vppœ The output voltage will momentarily drop to 0 volts at certain voltagesdue to output relay switching. This occurs when the output voltagecrosses the break-point voltage either from a lower voltage or ahigher voltage. The voltages are shown below (for a 0 volt dc offset):317 mVpp, 632 mVpp, 1.26 Vpp, 2.52 Vpp, 5.02 Vpp141