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3
Functions and Features
Decibel Display
The dBm unit calculates the power delivered to a reference resistance relative to 1
mW and can be applied to DC V, AC V and AC+DC V measurements for decibel
conversion. Voltage measurement is converted to dBm using the following formula:
The reference impedance may be specified from 1 to 9999 in Setup mode.
The default value is 50 .
The dBV unit calculates the voltage with respect to 1 V. The formula is as
shown below:
1 With the rotary switch set at
2 Press
[1] Depends on configuration in Setup mode.
92
1000
dBm
=
10
log
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
reference impedance
dBV
=
20
log
measured voltage
navigate to dBm or dBV
measurement is indicated on the secondary display.
for more than 1 second to exit this mode.
measured voltage
,
[1]
measurement on the primary display. The voltage
Keysight U1253B User's and Service Guide
2
, or
, press
(1)
(2)
to
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