Decibel Display - Agilent Technologies U1251A User's And Service Manual

Decibel Display

N O TE
Agilent U1251A/U1252A User's and Service Guide
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 Vin
10
1 At
, or
to scroll to dBm measurement on the primary
display. AC voltage measurement is indicated on the
secondary display.
If rotary switch is at "~ V" position, push
and dBm measurements. The dBm or dBV measurement can be selected
at ACV position, the selection will be the reference for other voltage
measurement.
2 Push
for more than 1 second to exit this mode.
Features and Functions
rotary switch position, push
to switch between dBV
3
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