Features and Functions 3
Agilent U1251A/U1252A User’s and Service Guide 65
Decibel Display
The dBm operation 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 by
using the following formula:
The reference resistance may be selected from 1~9999Ω in
Setup mode. Default value is 50Ω.
The decibel of voltage is calculated with respect to 1 V. The
formula is according to the voltage measurement below:
dBV = 20 log
10
Vin
1 At , or rotary switch position, push
to scroll to dBm measurement on the primary
display. AC voltage measurement is indicated on the
secondary display.
2 Push for more than 1 second to exit this mode.
NOTE
If rotary switch is at “~ V” position, push to switch between dBV
and dBm measurements. The dBm or dBV measurement can be selected
at ACV position, the selection will be the reference for other voltage
measurement.
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