How To Set The Reference Level; How To Input A Reference Level; How To Set The Reference Value To The Current Power Value - Agilent Technologies 8163A User Manual

Power Measurement
82

How to Set the Reference Level

How to Input a Reference Level

dB results are shown relative to a reference level. The [Ref] parameter
sets the reference level. Setting, or changing, the reference only affects
results that are displayed in dB.
The reference level is displayed in units of dBm or Watts. Depending
on which is selected the following equations are used to calculate the
power level in dB:
P (dB) = P
display measured
or
P
display
Where,
P is the displayed relative power,
display
P is the absolute power level (see "How to Set the
measured
Calibration Offset" on page 81), and
REF is the reference level.
You can choose the units for the reference using the Power Unit
softkey. If you choose dB, the power value changes to dB and the
displayed reference level changes to dBm.
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.
Agilent 8163A/B, 8164A/B, and 8166A/B User's Guide, Fourth Edition
(dBm) − REF(dBm)
P
measured
( )
dB = 10 log ----------------------------------
( )
REF W
How to Measure Power
( )
W