Keysight U3606B Mode D'emploi page 82

2 Operation and Features
dBm measurements
The logarithmic dBm (decibels relative to 1 mW) scale is often used in RF signal
measurements. The U3606B takes a measurement and calculates the power
delivered to a reference resistance (typically 50 Ω, 75 Ω, or 600 Ω). Voltage
measurement is then converted to dBm.
This math operation applies to voltage measurements only.
NOTE
The dBm function is logarithmic, and is based on a calculation of power delivered
to a reference resistance, relative to 1 mW. The formula used for calculating dBm
measurements is:
You can select the reference resistance value through the Utility menu. The
default setting is 600 Ω.
Enable the dBm function
82
dBm = 10 log × ( reading
10
2
§ ( reference resis tan ce ) § ( 1 mW ) )
To d isable the dBm function
Keysight U3606B User's Guide