Agilent Technologies 34450A Guia do Utilizador descarregar pdf (Página 63)

Functions and Features 2

34450A User’s Guide 41

Editing dBm measurement

The logarithmic dBm (decibels relative to one milliwatt)

scale is often used in RF signal measurements. The

multimeter’s dBm operation takes a measurement and

calculates the power delivered to a reference resistance

(typically 50, 75, or 600 Ω). The formula used for conversion

from the voltage reading is:

dBm = 10 × Log

[(Reading

/ R

REF

) / 0.001 Ω ]

You can choose from several reference resistance values:

REF

= 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,

900 Ω, 1000 Ω, 1200 Ω, or 8000 Ω.

You can view and select the reference value as described in

“Editing math functions reference values” on page 42.

Select dBm option

dBm measurement

Ongoing measurement

Reference value

Press to exit

Press to start

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Agilent Technologies 34450A Guia do Utilizador Página 63