How To Set The Calibration Offset; How To Set The Reference Level - Keysight N7744A User Manual

How to Set the Calibration Offset

How to Set the Reference Level

Keysight N774x Series
P is the chosen reference power value in Watts.
ref
This is a calibration offset that you can enter to compensate for external
optical circuitry, for example, an attenuator, switch, or a 3 dB coupler.
The calibration offset, [Cal], is automatically subtracted from the input
signal, as expressed in dB.
where,
P is the adjusted value of the signal read in dBm,
measured
P is the input signal level in dBm, and
input
CAL is the calibration offset in decibels (dB).
How to Input a Reference Level
dB results are shown relative to a reference level. Setting, or changing,
the reference only affects results that are returned in dB.
You can set the reference level in units of dBm or Watts. Depending on
which is selected the following equations are used to calculate the
power level in dB:
P = P (dBm) - REF(dBm)
dB measured
or
where,
P is the returned relative power,
dB
P is the absolute power level (see
measured
Offset" on page 49), and
REF is the reference level.
Power Measurement
"How to Set the Calibration
2
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