Agilent Technologies 33250A User Manual page 160

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Chapter 4 Remote Interface Reference
Output Configuration Commands
• Note that when you set the high and low levels, you are also setting
the amplitude of the waveform. For example, if you set the high level
to +2 volts and the low level to -3 volts, the resulting amplitude is
5 Vpp (with an offset voltage of -500 mV).
• Limits Due to Output Termination: If you change the output
termination setting, the displayed voltage levels will be automatically
adjusted (and no error will be generated). For example, if you set the
high level to +100 mVdc and then change the output termination
from 50 ohms to "high impedance", the voltage displayed on the
function generator's front-panel will double to +200 mVdc. If you
change from "high impedance" to 50 ohms, the displayed voltage
will drop in half. See the OUTP:LOAD command on page 163 for
more information.
• To invert the waveform relative to the offset voltage, you can use the
OUTP:POL command. See page 164 for more information.
VOLTage:RANGe:AUTO {OFF|ON|ONCE}
VOLTage:RANGe:AUTO?
Disable or enable voltage autoranging for all functions. In the default
mode, autoranging is enabled ("ON") and the function generator
automatically selects the optimal settings for the output amplifier and
attenuators. With autoranging disabled ("OFF"), the function generator
uses the current amplifier and attenuator settings. The :AUTO? query
returns "0" (OFF) or "1" (ON).
• The APPLy command overrides the voltage autorange setting and
automatically enables autoranging ("ON").
• The advantage of disabling autoranging is to eliminate momentary
disruptions caused by switching of the attenuators while changing
amplitude. However, the amplitude and offset accuracy and
resolution (as well as waveform fidelity) may be adversely affected
when reducing the amplitude below the expected range change.
• The "ONCE" parameter has the same effect as turning autoranging
"ON", and then "OFF". This parameter allows you to make a one-time
change to the amplifier/attenuator setting before returning to the
VOLT:RANG:AUTO OFF setting.
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