Keysight U1271A - Making Db Measurements (U1272 A Only); Figure 2-9 Dbm Display

2 Making Measurements
Making dB Measurements (U1272A only)
66 U1271A/U1272A User’s Guide
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 “Setting a custom dBm
reference impedance (U1272A only)” on page 137.
1 To set the multimeter to display values in dBm, first set
the rotary switch to , , , or .
2 Press until the voltage measurements are displayed as
a dBm value, as shown in Figure 2- 9.
Figure 2-9 dBm display
Press for more than 1 second to exit the dBm function.
Selecting the frequency test mode, also cancels the
dBm function.
Exit
Dual
Exit
Dual
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