Keysight Technologies 34450A 5.5 Digit Guide Rapide page 17

Editing Math Values
Reference values for Null, Limit, dB, or dBM math functions can be edited when
you enable that function.
Example: To edit reference value for dB function
2 3
1
Press to enable dB function
Move cursor to dB
4
Typical dB function display
5 6-a
Press for digit selection
6-b
Press to change the value of selected digit
7 8
Press to exit
Press to save the reference value
Keysight 34450A Quick Start Guide 17