Re: 475 Sweep question

donald collie
 

Replacing the defective transistor in the Z - Amp, with a more suitable
high speed type improves the problem, but it`s still there. This may be
normal for this `scope, or it might need further work. Would you be so good
as to tell me what this baseline shift is in a fault free Tek 475 is, on
the 0.01 us/div setting of the timebase switch?
Thankyou................................................................................................................................................................................................................Don
C.

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On Wed, Jan 24, 2018 at 12:03 PM, donald collie <donaldbcollie@...>
wrote:

I found a dead transistor in the Z Amp, which prompted me to check all the
Z Amp transistors, but the rest are OK. My 453A does this on the fastest
sweep setting, but only half a major division, and my 7834 not at all. The
Z compensation adjustment capacitor has no effect, so I`ll look in the
sweep section for the adjustment.
Thankyou....................................................
............................................................
............................................................
............................................Don
C.

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On Wed, Jan 24, 2018 at 2:44 AM, Chuck Harris <cfharris@...> wrote:

That is due to the amount of time the z-axis circuitry
takes to get the beam lit up and going. There is an
adjustment to minimize the effect, but it isn't perfect.

-Chuck Harris

donald collie wrote:
When I look at a 100Mhz signal, instead of starting at the left of the
CRT
graticule, the trace starts at the 2nd major division - 2 divisions to
the
right of the Left Hand Side. Is this normal?
This happens on both A, and B sweeps, at maximum sweep speed only. Your
comment will be appreciated.
Regards.....................................................
............................Don
Collie jnr.




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