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 1~9999
Ω
in
Setup mode. Default value is 50
Ω
.
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.
N O T E
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.
Summary of Contents for U1251A
Page 34: ...34 Agilent U1251A U1252A User s and Service Guide 1 Getting Started Tutorial...
Page 116: ...116 Agilent U1251A U1252A User s and Service Guide 5 Maintenance...
Page 120: ...120 Agilent U1251A U1252A User s and Service Guide 6 Accessories...
Page 156: ...156 Agilent U1251A U1252A User s and Service Guide 8 Specifications...
