HP 3330B Software Manual page 9

F3
Pressing F3 produces the Display Reference screen. The following screen is
displayed:
Using the up / down keys the reference memory for display can be selected.
Pressing Enter closes the Display Reference screen and displays the reference
sweep superimposed on the current sweep.
The reference sweep can be turned off by selecting No reference display.
F7
Pressing F7 causes the current screen to be plotted on a plotter attached to the
HPIB bus.
F8
Pressing F8 causes the current screen to be plotted to a file. The file is
automatically selected. The first file will be plot1.plt The number is incremented
as additional plots are made.
Programs such as PRINTGL can be used to print HPGL files on a laser printer.