Keysight U1271A Guia Del Usuario página 66

2 Making Measurements
Making dB Measurements (U1272A only)
Your multimeter is capable of displaying voltage as a dB value, either relative to
1 milliwatt (dBm) or a reference voltage of 1 volt (dBV).
Displaying dBm values
A dBm measurement must use a reference impedance (resistance) to calculate a
dB value based on 1 milliwatt. The reference impedance is set to 50 Ω by default.
To select another reference value, see the
impedance (U1272A only)"
1 To set the multimeter to display values in dBm, first set the rotary switch to
2 Press
Figure 2-9
Press
frequency test mode,
66
, , , or
until the voltage measurements are displayed as a dBm value, as
Dual
E xit
shown in Figure 2-9.
dBm display
for more than 1 second to exit the dBm function. Selecting the
Dual
E xit
"Setting a custom dBm reference
on page 137.
.
also cancels the dBm function.
Keysight U1271A/U1272A User's Guide