The dBm unit is a unit of power, not voltage. However, the generator
is always set in open-circuit voltage. When you are using the dBm unit
for generator output, the generator will be set to a voltage that would
cause the specified power (in dBm) to be dissipated in a load of 600 Ω.
If you are using a load with a different impedance, the power
calculation will not be correct. The generator’s source impedance is
included in the calculation, so if you change the source impedance of
the analog generator, it will change the output voltage of the analog
generator.
Part of the analog generator’s source impedance is shared between the
two channels, so this must be included in the dBm calculations. Any
channels that are turned on for generation are assumed to be loaded
with the specified impedance. For proper amplitude calibration, make
sure that any generator channels which are turned on are also loaded.
The impedance reference used in dBm calculations can be selected on
the Analyzer Only panel when dBm units are selected.
& For a more
information on
the dBm unit,
see pages 4-73
and 4-74.
4 Operation
Operation Controlling the Generator : Generator Loading
4-14 Portable One Plus Access User's Manual
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