It helps a bit ...
maybe I should see if Tektronics is still around and try to get a manual.
The real problem is that it's so old --- vacuum tubes instead of integrated
circuits. Thx.
(I'm the OP)

"bj" wrote in message
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"THo" wrote in message
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I was given an old oscilloscope, and I'm not sure if it's working
properly.
It's a tube-based one, Tektronic 515. There's only one probe with it,
and
I
connected it to a radio, and it does respond, somewhat. But when there
is
no signal of any kind, the image traced on the screen isn't a moving dot,
it's more like a band, and no matter how it's adjusted the band never
moves
more than halfway across the screen. I've attached a pic of the output
when
there is no input of any kind. How abnormal is this? Is there a way to
re-calibrate it or anything like that?

Tom


No.
This is not normal. It look like a sawtooth waveform from a sweep
circuit.
Sorry, I am not familiar
with this model. Does it have any built-in scope calibrator? Many of
their
even cheap scopes have
a built-in square wave generator. This allows you to set the waveform
amplitude and scope probe
frequency response (capacitance). I realize that this isn't much help.
Why
don't you contact
Tektronics?