My replies are in blue. As noted the applications for using these ports are few but are available in case you do have an application.I'm using a Tektronix 2445 , 2246, 2245
The Channel 1 and Channel 2 are the voltages you see on the CRT. You might use these outputs if you wanted do some kind of signal processing on the waveform you are viewing.
What would I use as a Signal Process or what do you mean?
If you wanted to do something else with the same signal that's been amplified by the scope's input amplifier
You would use this input if you were supplying your own X-Y inputs to the 'scope and needed to blank the beam when the X and Y positions are not valid.
For a phase shift measurement? No
The Z input can also be used to modulate the intensity of the beam such as using it to display a raster picture.
An example: I used it to generate X-Y dots on a screen to show the data in a small SRAM that I was testing for data dropout during transient EMP (nuclear event) radiation testing. The Z input was modulated so that a bright dot indicated a One and a dim dot indicated a Zero for each memory location. I triggered the horizontal sweep to generate a horizontal line and applied a staircase step signal to the vertical input to generate a series of lines. This, with the Z modulation, generated an X-Y dot display of all the memory locations. I stored a known pattern in the SRAM (all Ones, all Zeros, alternate Ones, diagonal Ones, etc.) and it was easy to see any memory locations that were disturbed after the EMP pulse.
(The machine to generate this EMP pulse consisted of large capacitors charged to a high voltage in an oil filled tank about 15' dia x 50' long. Suddenly discharging the capacitors into a titanium target, generated an intense pulse of X-rays [I think instantly lethal to anyone in its path]. The bang it made when fired shook the building).
Why would you want the scope to blank the beam with X and Y are not valid?
I am guessing that the TTL signal you are referring to is the sweep blanking signal. The blanking signal is active during the visible portion of the waveform. The blanking signal can be used to synchronize other test equipment to the signal displayed on the CRT.
So I can take the TTL output of the Oscope and plug it into an input or the test equipment needs a blanking signal input?
Yes, for example if you want to synchronize some measurements with the observed sweep.
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by Jake Hertz