3 Functions and Features
92 Keysight U1253B User’s and Service Guide
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:
(1)
The reference impedance may be specified from 1 Ω to 9999 Ω in Setup mode.
The default value is 50 Ω.
The dBV unit calculates the voltage with respect to 1 V. The formula is as
shown below:
(2)
1 With the rotary switch set at , , or , press to
navigate to dBm or dBV
[1]
measurement on the primary display. The voltage
measurement is indicated on the secondary display.
2 Press for more than 1 second to exit this mode.
[1] Depends on configuration in Setup mode.
dBm 10
1000
measured voltage
()
2
×
reference impedance
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⎝⎠
⎜⎟
⎜⎟
⎛⎞
log=
dBV 20
measured voltage
()log=
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