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dBm measurements
The logarithmic dBm (decibels relative to 1 mW) scale is often used in RF
signal measurements. The U3606A 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.
N O T E
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 settings is 600 Ω. See
value"
Enabling the dBm operation
Press Shift >
The dBm annunciator is illuminated and the dBm function is enabled.
Press Shift >
U3606A User's and Service Guide
This math operation applies to voltage measurements only.
×
(
dBm
=
10
log
reading
10
on page 121 for more information.
dBm
to enable the dBm operation.
dBm
again or Shift >
2
⁄
(
reference resis
tan
"Selecting a dBm reference resistance
dBm annunciator
Exit
to exit the dBm mode.
Digital Multimeter Operation
Math Operations
)
⁄
(
)
)
ce
1 mW
2
59
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