HP 70427A User Manual page 319

Softkeys and Displays
LO FREQ (tunable source)
LO FREQ (tunable source)
This softkey allows entry of a tunable source LO frequency between
2.4 GHz and 25.8 GHz in 600 MHz steps.
Normally, an output frequency is entered and the tunable source calculates
the LO and RF source frequency. If you enter an LO frequency you must
keep track of those frequencies yourself.
Path
Output LO FREQ
HP-IB command
TS:OUT:LO:FREQ frequency
Where frequency is a real number.
Figure 10-56 HP 70428A Option 002
10-76 HP 70427A/HP 70428A User's Guide