If you use a VA62, you won't need a scope with X-Y mode. That's only needed if you use a sweep gen and want to see the actual IF response curve.
The VA62 uses something called "bar sweep alignment" which makes use of the multi-burst function. Rather than a continuous sweep of frequencies it uses 10 bursts of increasing frequency. Basically you connect the output of the IF to a scope and tweak the IF while observing the peaks of those bursts. So rather than a response curve, you get a bar graph.
Here's an image taken from the manual.
