Keysight Technologies N774 C Series, Руководство пользователя

Страница: 61 / 84

Keysight N774xC Series Multiport Power Meter User’s Guide 61
User Interface Reference
4
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 59).
How to Reference Another Power Measurement Channel
You can use the reference mode to reference to another channel’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.
The following equations describe how the power in dB is calculated if you
reference another channel:
or
where:
P
dB
is the relative power,
P
measuredA
is the absolute power level (see How to Set the Calibration
Offset on page 59) measured by the current port, and
P
measuredB
is the absolute power level (see How to Set the Calibration
Offset on page 59) measured by the port you choose to reference, and
REF is the reference level in decibels (dB).