oscilloscope at victoria st. vinnie's. twelve bux, cheap! - diyAudio
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Old 15th March 2006, 12:35 AM   #1
maxro is offline maxro  Canada
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Default oscilloscope at victoria st. vinnie's. twelve bux, cheap!

There is a Starkit oscilloscope at the local St. Vincent de Paul for $12 if anyone's interested. Actually there were two, but I bought the Heathkit one. Any ideas on how to use it?

Max
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Old 15th March 2006, 12:40 AM   #2
tade is offline tade  United States
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Is it in workign order? I think I might like to own one!
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Old 15th March 2006, 01:02 AM   #3
maxro is offline maxro  Canada
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I think it sort of works. I really don't know anything about these things. It powers on, but emits a quiet humming noise. With nothing hooked up to it, there is a trace that looks like a partial waveform. I would think that it should be a stationary point with no input. I fiddled with the dials but couldn't get the trace to stand still. Probably not worth shipping as it's rather big and heavy.

I took the Heathkit one because it has a stationary trace and maximum frequency of 150kHz, rather than the Starkit's 75kHz. Also it doesn't hum.

Max
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Old 15th March 2006, 04:01 AM   #4
tade is offline tade  United States
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i see. I dont think i am could manage to fix it even if it werent bulky. Good score though.
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Old 15th March 2006, 04:07 AM   #5
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first scope i bought, cleaned the pots, first thing, with wd-40.

showed the guy i bought it from, he says, i couldn't get that fine

of a trace-
``````````````````````````````````
also a heath kit
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Old 15th March 2006, 05:26 AM   #6
lgreen is offline lgreen  United States
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Quote:
Originally posted by maxro
I think it sort of works. I really don't know anything about these things. It powers on, but emits a quiet humming noise. With nothing hooked up to it, there is a trace that looks like a partial waveform. I would think that it should be a stationary point with no input. I fiddled with the dials but couldn't get the trace to stand still. Probably not worth shipping as it's rather big and heavy.

I took the Heathkit one because it has a stationary trace and maximum frequency of 150kHz, rather than the Starkit's 75kHz. Also it doesn't hum.

Max
You may be seeing AC noise, change the "time/div" control and the trace should move faster, you should not get a dot. Hook it up to a test tone (you can download some from my web site below) and see if you can see the wave. You want to go at like 2 or 5v/div (vertical) and vary the horiz (time div), AC couple.

You read these per division on the screen so at 1v/div (vertical) a trace that goes up 1 div = 1volt. time/div is on horiz, note that frequency = 1/time to compute what freq you are seeing.

have fun, you can figure it out.
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Old 15th March 2006, 05:54 AM   #7
maxro is offline maxro  Canada
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Quote:
Originally posted by lgreen


You may be seeing AC noise, change the "time/div" control and the trace should move faster, you should not get a dot. Hook it up to a test tone (you can download some from my web site below) and see if you can see the wave. You want to go at like 2 or 5v/div (vertical) and vary the horiz (time div), AC couple.

You read these per division on the screen so at 1v/div (vertical) a trace that goes up 1 div = 1volt. time/div is on horiz, note that frequency = 1/time to compute what freq you are seeing.

have fun, you can figure it out.
Well, actually that was on the humming one that I didn't get. Probably the ac hum I was hearing that was showing up on the screen.

I was just playing with mine and getting a nice horizontal line, but it started to smell bad (no magic smoke, though), so I turned it off and unplugged it. I'll investigate further, later on. Hope I didn't pick the wrong one.

Max
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