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Chapter 4 Remote Interface Reference
Output Configuration Commands
4
VOLTage {<amplitude>|MINimum|MAXimum}
VOLTage? [MINimum|MAXimum]
Set the output amplitude. The default amplitude is 100 mVpp (into 50Ω)
for all functions. MIN selects the smallest amplitude (10 mVpp into
50Ω). MAX selects the largest amplitude for the selected function (at
most 10 Vpp into 50Ω depending on the selected function and offset
voltage). The VOLT? query returns the output amplitude for the function
currently selected. Values are always returned in the units set by the
most recent VOLT:UNIT command.
• Offset Voltage Limitations
: The output amplitude and offset are
related to V
max
as shown below.
|V
offset
|+V
pp
÷2 < V
max
where V
max
is the maximum
peak voltage
for the selected output
termination (5 volts for a 50
Ω
load or 10 volts for a high-impedance
load). The new amplitude specified in the
VOLT
command will be set,
but the offset voltage may be reduced accordingly, and a “Settings
conflict” error generated.
• Limits Due to Output Termination: If you change the output
termination setting, the displayed output amplitude will be
automatically adjusted (and no error will be generated). For example,
if you set the amplitude to 10 Vpp and then change the output
termination from 50 ohms to “high impedance”, the amplitude
displayed on the function generator’s front-panel will
double
to 20 Vpp
.
If you change from “high impedance” to 50 ohms, the displayed
amplitude will drop in half. For more information, see the OUTP:LOAD
command on page 189.
• You can set the output amplitude in Vpp, Vrms, or dBm by specifying
the units as part of the VOLT command as shown below.
VOLT 3.0 VRMS
Or, you can use the VOLT:UNIT command (see page 191) to specify
the output units for all commands that follow.
• 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 191 for more information.
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