HP 8163A - How to Set the Reference Value to the Current Power Value; How to Reference Another Power Measurement Channel

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Power Measurement
How to Measure Power
To set the reference level to 10 mW:
1 Move to the Power Meter channel and press the [Details]
softkey.
2 Move to the [REF] parameter and press the [Power Unit] softkey.
3 Move to <W> and press ENTER twice.
4 Change the units to mW using the [Unit+] and [Unit−] softkeys.
5 Enter 10.000 and press ENTER.
How to Set the Reference Value to the Current Power Value
In addition to entering a new reference value, you can change the
reference value to the currently displayed power value by pressing
the [Dsp->Ref] softkey.
Pressing the [Dsp->Ref] softkey takes the input power level and
stores it as the reference. Setting the reference only affects results
displayed in dB.
When you press the [Dsp->Ref] softkey, the absolute power level,
the power value in dBm or Watts, is stored as the reference, that is:
REF = P
measured
Where,
REF is the reference, and
P
measured
is the absolute power level (see “How to Set the
Calibration Offset” on page 66).
The [Dsp->Ref] softkey is displayed if you move to a power
measurement channel.
How to Reference Another Power Measurement Channel
You can use the reference mode to the reference another Power
Meter’s current power level. If you choose this mode, the reference
of the channel continuously updates to the current power value
measured by the other channel.