HP 70427A User Manual page 298

IF
This display shows the downconverter's IF frequency.
When an input frequency is entered with the
downconverter computes the IF frequency and displays it.
The IF frequency can be changed by changing the LO frequency with the
softkey. The new IF frequency will be calculated and displayed even if
FREQ
it is out of range.
If only an LO frequency was entered, the
blank and it is up to you to keep track of the input and IF frequencies.
Path
Freqs
or,
Amplitudes
or,
Ref Chain
HP-IB command
Returns a real number.
Softkeys and Displays
INPUT FREQ
and
IF: Input:
DC:FREQ:IF?
HP 70427A/HP 70428A User's Guide 10-55
IF
softkey, the
LO
displays will be