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Is this oscilloscope working? or is it broken?

S

Sam Kaan

Jan 1, 1970
0
In these photos I can adjust the dot(s) along the vertical axis. Although
the Plugins are put in incorrectly.

http://members.rogers.com/cadnewbie/tek/osc1.JPG
http://members.rogers.com/cadnewbie/tek/osc2.JPG
http://members.rogers.com/cadnewbie/tek/osc3.JPG
http://members.rogers.com/cadnewbie/tek/osc4.JPG
http://members.rogers.com/cadnewbie/tek/osc5.JPG
http://members.rogers.com/cadnewbie/tek/osc6.JPG
http://members.rogers.com/cadnewbie/tek/osc7.JPG
http://members.rogers.com/cadnewbie/tek/osc8.JPG

In these pictures, I can only adjust the dot(s) along horizontal axis. This
time the plugins are in the
correct slots on the mainframe. However I can not for some reason move the
dot along the vertical axis, but
only along the horizontal. I did try to turn the knobs label as "offset"
and "position", those two big knob on the left Plugin.

http://members.rogers.com/cadnewbie/tek/horiz0.JPG
http://members.rogers.com/cadnewbie/tek/horiz1.JPG
http://members.rogers.com/cadnewbie/tek/horiz2.JPG
http://members.rogers.com/cadnewbie/tek/horiz3.JPG

I had a chance to go to the library today and look at a book about using a
scope. In it, it talks about you have to turn the
TIME/DIV knob to the X-Y position on the dial before you can change the
vertical and horizontal position of the trace.
But on my scope, the TIME/DIV knob has no X-Y dial position.

I think that the scope itself is ok as far as being able to place the dot
anywhere on the screen, as can be shown in the previous pictures I took.
So it is possible the plugins themselves are bad. Or perhaps there are
something else I forgot to set which would have made this to work.

I am very new at it, and would hope someone can help me get this thing
working
or at least determine for sure that its not working
so I can describe to a repair shop what's wrong with it.
 
P

Peter Bennett

Jan 1, 1970
0
I had a chance to go to the library today and look at a book about using a
scope. In it, it talks about you have to turn the
TIME/DIV knob to the X-Y position on the dial before you can change the
vertical and horizontal position of the trace.
But on my scope, the TIME/DIV knob has no X-Y dial position.

The X-Y mode is rarely used. With the 7904, you would need a vertical
amplifer in a horizontal slot to do it.
I think that the scope itself is ok as far as being able to place the dot
anywhere on the screen, as can be shown in the previous pictures I took.
So it is possible the plugins themselves are bad. Or perhaps there are
something else I forgot to set which would have made this to work.

Your vertical amplifier has two channels - if selecting Channel 1 and
playing with the channel 1 position and offset controls has no effect,
try selecting channel 2, and using the channel 2 position and offset
controls.

I believe you have two vertical amps - repeat this with the other one,
and with either amp in the Right Vertical (second) slot (select "B"
vertical mode).

You should be able to determine whether the fault lies in one of the
plug-ins, or in the mainframe.
 
W

Wayne Shanks

Jan 1, 1970
0
Where is your horizontal time base..... you need one of those also

they go on the right side... so get that vertical amp out of slot that
says time base along the bottom frame. It looks like it might work if
you get a horizontal plug-in

wayne s
 
W

Wayne Shanks

Jan 1, 1970
0
OOps, I just realized you do have a horizontal plug-in...

You have it in the vertical amplifier slot....


reverse the order of those puppies, and try again

Wayne s
 
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