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4
Multimeter Setup Options
Setting a custom dBm reference impedance
This setting is used with dB measurements (see page 62). The dBm function is logarithmic,
and is based on a calculation of power delivered to a reference impedance (resistance),
relative to 1 mW.
Parameter
dbrEF
To change the dBm reference impedance value:
1 Press
2 Press
Figure 4-7
3 Press
4 Press
step 3 to edit.
5 Press
6 Press and hold
126
Range
(1 to 9999) Ω
while turning the rotary switch to access the Setup menu.
Shift
Esc
or
on
until
Hold
dbrEF display
Vsense
or
to set the dBm reference impedance value.
or
on
to navigate to the consecutive values, then repeat
Hold
to save your changes, or press
Hz
Save
until the multimeter restarts to return to normal operation.
Shift
Esc
Defaul t setting
50 Ω
is shown on the secondary display.
to discard your changes.
Shift
Esc
Keysight U1281A/U1282A User's Guide
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