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automatically adjusted if you select a frequency that is not valid with the present duty cycle. For example, if you set the duty cycle to 70% and then change the frequency to 8 MHz, the function generator will automatically adjust the duty cycle to 60% (the upper limit for this frequency). A -221 "Settings conflict" error will be generated and the duty cycle is automatically adjusted.

Output Amplitude The output amplitude range depends on the function currently selected and the output termination. You can substitute "MINimum", "MAXimum" or "DEFault" in place of a specific value for the amplitude parameter. MIN selects the smallest amplitude for the selected function (50 mVpp into 50 ohms). MAX selects the largest amplitude (10 Vpp into 50 ohms). The default units for amplitude is volts peak to peak (Vpp). This can be overridden by including a units suffix in each amplitude parameter (vpp, vrms, dbm), or to change the default units from Vpp to another, use the SOUR:VOLT:UNIT command. The default amplitude is 100 mVpp (into 50 ohms) for all functions.

	Output	Minimum	Maximum	Default
Function	Termination	Amplitude	Amplitude	Value
Sine,
Square,	50Ω
Triangle,		50 mVpp	10 Vpp	100 mVpp
Ramp,
Noise,
Built-In Arbs 1
Sine,
Square,
Triangle,	Open Circuit	100 mVpp	20 Vpp	100 mVpp
Ramp,
Noise,
Built-In Arbs 1

1There are five built-in arbitrary waveforms stored in non-volatile memory: sinc, negative ramp, exponential rise, exponential fall and cardiac. These waveforms are shown on page 48.

•For arbitrary waveforms, the maximum amplitude will be limited if the data points do not span the full range of the output DAC (Digital- to-Analog Converter). For example, the built-in “SINC” waveform does not use the full range of values between ±1 and therefore its maximum amplitude is 6.084 Vpp (into 50 ohms).

•You can set the units for output amplitude to Vpp, Vrms, or dBm with the VOLTage:UNIT command. See “Output Units” on page 25. for more information.

•Possible Conflict with Function Change: The output amplitude is automatically adjusted if you select a function whose maximum amplitude is less than that of the currently active function. This conflict may arise when the output units are Vrms or dBm due to the differences in crest factor for the output functions. For example, if you output a 5 Vrms square wave (into 50 ohms) and then change the function to sine wave, the function generator will adjust the output amplitude to 3.535 Vrms (the upper limit for sine waves in Vrms). A -221, “Settings conflict” error is generated and the amplitude is

98 Agilent E1441A SCPI Command Reference Chapter 3