BNC 645 - Manual (Page 167)

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The minimum value is the most negative voltage level and the maximum value
is the largest voltage level for the chosen function.
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The high and low voltage level must conform the following restriction:
Vhigh – Vlow ≤ Vpp (max) and Vhigh, Vlow ≤ Vpp (max)/2
Where Vpp (max) is the maximum peak-to-peak amplitude for the chosen
output termination (10 Vpp for a 50-ohm load or 20 Vpp for a high-impedance
load). If you specify an invalid voltage level, the waveform generator will adjust
it automatically to the highest allowed value and “Data out of range” error is
generated.
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The high voltage level should always be greater than the low level. If not,
a “Setting conflict” error is generated and the waveform generator
automatically set the high level to 1 mV larger than the specified low level.
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specifying a high level and low level also sets the offset. For instance, you
will have an amplitude of 5 Vpp (with an associated offset voltage of -500
mV) when you set your high level to +2 Vpp and low level to -3 Vpp.
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When the Output Termination Setting is changed, the voltage levels are
automatically adjusted. For instance, when you change the output
termination from 50 ohms to “high impedance”, your voltage shown on the
display doubles, and when Output Termination has been changed from
“high impedance” to 50 ohms, the voltage decreases in half.
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To invert the waveform relative to the offset voltage, you can use the
OUTP:POL command.
VOLTage:HIGH? [MINimum︱MAXimum]
Query the high voltage level.
VOLTage:LOW {<voltage>︱MINimum︱MAXimum}
Specify the low voltage level. The default low level for all functions is -50 mV.
The minimum value is the most negative voltage level and the maximum value
is the largest voltage level for the chosen function.
z
The high and low voltage level must conform the following restriction:
Vhigh – Vlow ≤ Vpp (max) and Vhigh, Vlow ≤ Vpp (max)/2
Where Vpp (max) is the maximum peak-to-peak amplitude for the chosen
output termination (10 Vpp for a 50-ohm load or 20 Vpp for a high-impedance