Ah. I think I understand. Do I need to inject a signal, say from a small
signal generator that outputs a dirty square wave, or can I do it simply by
turning on the scope, defocusing the spot and manipulating the horz control
while measuring the voltage on the two test points?
On Fri, Dec 5, 2014 at 3:34 PM, aodiversen@... [TekScopes] <
TekScopes@...> wrote:
Hi Kevin,
In XY mode a vertical signal is not really needed but it looks nicer.
Simply defocus the spot and set it to a convenient brightness. The idea is
that you can watch DC voltages now with your DMM while you slowly rotate
Hor Pos from fully counter clockwise to fully clockwise and back. You might
find for instance that the first stage (test points 85 and 86) follows the
Hor Pos knob position smoothly over the whole range from 2.1 V to 4.1 V,
while the second stage fails. It might be normal that the Hor Pos even goes
slightly beyond these extremes of the sweep.
Albert
---In TekScopes@..., <kcrossett@...> wrote :
Hi Albert. Appreciate the advice. I have checked the XY mode, but only
with
no signal. The dot near the middle does move slightly, but only about a
half-an-inch or so. I don't have any way locally to create a triangular
wave form, and I don't have, or know anyone, with a second scope to use
for
testing. I hope I don't need to desolder any of the transistors to check
them out. That would require some extensive disassembly, as far as I can
tell from looking at the physical component locations.
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