Keysight U3606B Mode D'emploi page 83

dB measurements
Each dB measurement is the difference between the input signal and a stored
relative value, with both values converted to dBm. When enabled, the dB
operation computes the dBm value for the next reading, stores the dBm result
into the relative value register, and immediately produces the dB calculation. The
formula used for calculating dB measurements is:
The relative value can take any value between 0 dBm and ±120.000 dBm. The
default relative value is 0 dBm. You can either let the instrument automatically
measure this value, or you can enter a specific value.
This math operation applies to voltage measurements only.
NOTE
Enable the dB function
Enable the dBm function first.
The first displayed reading is always
precisely 00.000 dB.
Keysight U3606B User's Guide
dB = reading in dBm relative value in dBm
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Operation and Features
To d isable the dB function
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