[Electronic M]

You can't properly align a TV with the HP generator and scope alone (without it taking 100x longer than it should).
The HP generator appears to be a lab instrument and only useful as a single marker generator.

To align a TV you need a Sweep generator and a marker generator (sometimes sold combined into one housing and called a Sweep-Marker generator...The B&K 415 is an example) and also an oscilloscope.
A sweep generator has a RF oscillator who's frequency is modulated (swept) by a lower frequency (usually 60Hz)....so a sweep generator designed to align a TV with a 45MHz IF will output 38MHz and that frequency will increase till increase to 48MHz faster than you can blink then it will instantly be back at 38MHz and and repeat this cycle 60 times a second.

A TV marker generator emits a single frequency that should remain constant...In TV sweep alignment you often need to see multiple markers at once so a TV marker generator often consists to 5-10 different fixed frequency oscillators in a box with switches to turn individual oscillators on and off...often there will be a frequency in a TV alignment proceedure that is not one of the fixed markers in a TV marker generator....when that's the case a variable frequency VHF modulator like the HP (and a frequency counter to accurately set it's frequency) will work for a custom frequency marker.

Your oscilloscope is a 10MHz scope....that means it can't display a recognizable sinewave above 10MHz....it will display a fat trace (the height roughly corresponding to amplitude ) for frequencies above 10MHz (the higher above 10MHz the less accurate the amplitude and the weaker the response of the scope.

The spikey camel back wave form you see in your TVs alignment proceedure is the plot of the IF frequency response (vertical axis is amplitude and horizontal is frequency). It's basically the graph you would get if you took your HP and injected a signal at the bottom frequency of the IF response curve, measured the Voltage at the video detector produced by it, increased the HPs frequency 10KHz, and repeated till you hit the top frequency of the IF response....the sweep generator and scope take this several hour manual measure and plot task and automates it such that it does the plot on the scope face 60 times a second.