User`s guide

40 34450A User’s Guide
2 Functions and Features
Editing dB measurement
When enabled, the dB operation computes the dBm value for
the next reading, stores the dBm result into the dB Ref
register, and immediately produces the following calculation.
The first displayed reading is always precisely 000.00 dB.
dB = 10 × Log
10
[(Reading
2
/R
REF
)/0.001 W]–dB Ref
You can view and edit the dB reference value as described
in “Editing math functions reference values” on page 42.
dB measurement
Ongoing measurement
Reference value
0dB to
±120.0000 dBm
Default : R
REF
is 0 dBm
2
Select dB option
Press to exit
1
3
4
Press to edit