8163A/B, 8164A/B, 8166A/B User’s Guide 103
Power Measurement 3
To set the calibration offset to 40.000 dB:
1 Move to the Power Meter channel and press the [Details] softkey.
2 Move to the [Cal] parameter and press Enter.
3 Enter 40.000 and press Enter.
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
display
(dB) = P
measured
(dBm) - REF(dBm)
or
Where,
P
display
is the displayed relative power,
P
measured
is the absolute power level (see How to Set the Calibration Offset
on page 102), 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.
3Move 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.
P
display
dB() 10
P
measured
W()
REF W()
-----------------------------------log=
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