A user interface is presented for a tester that tests a frequency converter having
an input port, an output port and a local oscillator port. In a first area, a user
can specify frequency for an input signal to be placed on the input port. In a
second area, the user can specify frequency for a local oscillator signal to be
placed on the local oscillator port. The tester calculates expected frequency values
of an output signal on the output port output based on values entered in the first
area and the second area.
