66 U1253B User’s and Service Guide
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:
(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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