James, I suggest you get a service manual and operators manual.  I have seen the pdfs floating around for the 465/475's.  The service manual will have details on doing a field calibration.  You may try to post this to the tektronix yahoo group, theres a lot of knowledgeable people there who can help you.  Your scope sounds ok to me, probably needs a little adjusting.  If you do a google search there is a gentleman who tracks tek scope prices on ebay, you can see what the going rate for a 465 is.

Regards, Bob

James Tu <james@2-BIT-TOYS.COM> wrote ..
> I recently bought a Tektronix 465 (100Mhz, 2 Channels) from ebay.
>
> I have limited equipment (no function generator), but I do have some PICs
> to do PWM or whatever.
>
> What tests should I perform on the scope to make sure that everything is
> ok.  I'm mainly using this for hobby work and maybe some professional gigs
> (nothing on the level of NASA or anything).  What are the important
> functions/features that I should test for?
>
> Here's what I tested so far (I just have a simple bnc connector with two
> alligator clips...I ordered probes and they haven't arrived yet):
> (1) scope's own calibration signal - 300mV and ~1Khz.  Seemed ok.  The
> traces look like they narrow slightly near the left and the right, so that
> the period for a square wave is _slightly_ off.  I tested both channels
> with this signal.  For the vertical modes, I tested AC, GND and DC.  DC
> mode is as I described above, GND is fine, too.  In AC mode, the top and
> bottom of the square tapers ever so slightly (i.e., the voltage decreases)
> before reaching a rising for falling edge
>
> (2) hooked up my electric guitar to it.  Played a C and then a C an octave
> higher...the waveform seemed to double in frequency.   :)
>
> (3) turned the "intensity" knob - at low intensities, the beam flickers
> slightly.
> turned the "focus" knob - this works
>
> (4) all the positional controls (ch A & B vertical and time horizontal)
> work.
>
> (5) beam finder button works but you have to pressed the button halfway
> instead of all the way...sometimes I see a fuzzy line across the screen
> that is 1 big box below the middle line...sometimes I see a shorter beam
> with two bright endpoints...off centered to the left and 1 big box below
> the middle line.
>
> (6) triggering and triggering adjustments worked for both channels
> (although I'm not familiar with all the triggering modes)
>
> (7) The "Invert" button gives me the inverted signal but the trace is
> shifted down.
>
> Is this an okay scope based on the tests I performed(I paid about $125
> for
> it...is this a good deal?)...or should I return this scope to the seller?
>
>
> James
>
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