Keysight 33210A, User Manual

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Chapter 4 Remote Interface Reference
Using the APPLy Command
4
• You cannot specify the output amplitude in dBm if the output
termination is currently set to “high impedance”. The units are
automatically converted to Vpp. See the
VOLT:UNIT
command on
page 183 for more information.
• Limits Due to Units Selection: In some cases, the amplitude limits
are determined by the output units selected. This may occur when the
units are Vrms or dBm due to the differences in crest factor for the
various output functions. For example, if you output a 5 Vrms square
wave (into 50 ohms) and then change to the sine wave function,
the function generator will automatically adjust the output amplitude
to 3.536 Vrms (the upper limit for sine waves in Vrms). From the
remote interface, a “Data out of range” error will be generated and the
amplitude will be adjusted as described.
• Arbitrary Waveform Limitations: For arbitrary waveforms, the
maximum amplitude will be limited if the waveform 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 limited
to 6.087 Vpp (into 50 ohms).
• While changing amplitude, you may notice a momentary disruption
in the output waveform at certain voltages due to switching of the
output attenuators. The amplitude is controlled, however, so the
output voltage will never exceed the current setting while switching
ranges. To prevent this disruption in the output, you can disable the
voltage autoranging feature using the
VOLT:RANG:AUTO
command
(see page 178 for more information). The
APPLy
command
automatically enables autoranging.
33210A users guide.book Page 165 Wednesday, July 16, 2008 11:16 AM