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98 Agilent E1441A SCPI Command Reference
Chapter 3
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.
1
There 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
Function
Output
Termination
Minimum
Amplitude
Maximum
Amplitude
Default
Value
Sine,
Square,
Triangle,
Ramp,
Noise,
Built-In Arbs
1
50Ω 50 mVpp 10 Vpp 100 mVpp
Sine,
Square,
Triangle,
Ramp,
Noise,
Built-In Arbs
1
Open Circuit 100 mVpp 20 Vpp 100 mVpp