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Message |
Guest
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 Posted:
Mon May 02, 2005 8:35 am Post subject:
Did I break my scope probe? help! |
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Hello all,
I just got my first oscilloscope today, a Tek 2213, off ebay and was
playing with it most of the day using ether the probe adjust signal or
signals from my computer's sound card. The square waves from the probe
adjust where square and the sine, square, sawtooth, etc. waves from my
computer where as they should be too, everything was working fine!
Then... I decided I wanted to clean the unit...
The first thing I do is take off the pouch bag on top by removing the
two screws that hold the plastic back piece on, one more screw later I
had the blue case off to look inside the unit. I got the case back on
and then give the front panel a rub down with isopropyl alcohol and
Qtips. After fully dismantling the probe I did the same to it, the
probe is a "Tek p6006 BNC 3.5 / 10x = 7pf. 10M-Ohms"
After I get everything back together and turned the unit on I tested it
with the probe adjust signal, the square wave was not square, It has a
triangular spike at the top / beginning of the wave and the inverse at
the end / bottom of the wave. I switched the probe to the other
channel... same thing... test it with my PC... only thing that looks
normal is the sine wave*. After all that I connect another probe that
came with the unit, an old looking and worn out RCA WG401A. Everything
seems to be ok again.
What did I break???
*sorry forgot, If I remember right... I can flip the switch from AC to
DC that's on the vertical mode panel and the wave becomes (more) square.
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Guest
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| Posted:
Mon May 02, 2005 8:35 am Post subject:
Re: Did I break my scope probe? help! |
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| Sorry, wrong group... should have when to repair. |
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Chris Jones
Guest
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| Posted:
Sat May 07, 2005 12:35 am Post subject:
Re: Did I break my scope probe? help! |
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You probably altered the setting of the variable capacitor
inside the probe handle. That's the little screwdriver slot
made from plastic set into the side of the probe. Use the
calibrator signal to adjust for a nice square wave.
Many people don't know how to do this, so all of their AC
measurements are inaccurate.
Chris
nbritton@nbritton.org wrote:
| Quote: | Hello all,
I just got my first oscilloscope today, a Tek 2213, off ebay and was
playing with it most of the day using ether the probe adjust signal or
signals from my computer's sound card. The square waves from the probe
adjust where square and the sine, square, sawtooth, etc. waves from my
computer where as they should be too, everything was working fine!
Then... I decided I wanted to clean the unit...
The first thing I do is take off the pouch bag on top by removing the
two screws that hold the plastic back piece on, one more screw later I
had the blue case off to look inside the unit. I got the case back on
and then give the front panel a rub down with isopropyl alcohol and
Qtips. After fully dismantling the probe I did the same to it, the
probe is a "Tek p6006 BNC 3.5 / 10x = 7pf. 10M-Ohms"
After I get everything back together and turned the unit on I tested it
with the probe adjust signal, the square wave was not square, It has a
triangular spike at the top / beginning of the wave and the inverse at
the end / bottom of the wave. I switched the probe to the other
channel... same thing... test it with my PC... only thing that looks
normal is the sine wave*. After all that I connect another probe that
came with the unit, an old looking and worn out RCA WG401A. Everything
seems to be ok again.
What did I break???
*sorry forgot, If I remember right... I can flip the switch from AC to
DC that's on the vertical mode panel and the wave becomes (more) square. |
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Jim Yanik
Guest
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| Posted:
Sat May 07, 2005 9:22 pm Post subject:
Re: Did I break my scope probe? help! |
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Chris Jones <lugnut808@yahoo.com> wrote in
news:117nqgvqbsk572a@corp.supernews.com:
| Quote: | You probably altered the setting of the variable capacitor
inside the probe handle. That's the little screwdriver slot
made from plastic set into the side of the probe. Use the
calibrator signal to adjust for a nice square wave.
Many people don't know how to do this, so all of their AC
measurements are inaccurate.
|
No,his probe is an older model from tube scope days,that uses the probe
body to adjust compensation,then lock another threaded collar against it to
retain the setting.
--
Jim Yanik
jyanik
at
kua.net |
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