DATATEC EDU34450A Guia Del Usuario página 71

To disable the dB Scaling operation, press Scaling ON | OFF.
dBm Scaling
The logarithmic dBm (decibels relative to one milliwatt) scale is often used in RF signal measurements. The
instrument takes a measurement and calculates the power delivered to a reference resistance (typically 50 Ω, 75 Ω,
or 600 Ω). The voltage measurement is then converted to dBm. The formula used for calculating dBm measurements
is:
2
dBm = 10 × log [(Reading / R ) / 0.001 W]
10 REF
You can choose from several reference resistance values:
R = 2 Ω, 4 Ω, 8 Ω, 16 Ω, 50 Ω, 75 Ω, 93 Ω, 110 Ω, 124 Ω, 125 Ω, 135 Ω, 150 Ω, 250 Ω, 300 Ω, 500 Ω, 600 Ω, 800 Ω,
REF
900 Ω, 1000 Ω, 1200 Ω, or 8000 Ω.
Front Panel Operations
Press [Shift] > [Null] | Math > Function Scaling > Scaling ON | OFF. Then press Scaling Function and select dBm to
enable the dBm Scaling operation.
Keysight EDU34450A User's Guide 71