Author: rpsommers@gmail.comDate: 20:30 04-05-07
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I just received an oscilloscope I bought off eBay. I'm trying to test
it but can't seem to get any vertical deflection. I setup a little LED
flasher with a 16F88 and put it in INTRC+ClkOut. When I measure the
clock frequency with my multimeter I get 62kHz. But I can't get the
scope to show any deflection. I was expecting to get a square wave
with a peak voltage of 5v.
I don't have the manual. It's a Tektronix 2336 100mhz. Any ideas?
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Author: redbellyDate: 21:51 04-05-07
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On May 4, 8:30 pm, "rpsomm...@gmail.com" <rpsomm...@gmail.com> wrote:
> I just received an oscilloscope I bought off eBay. I'm trying to test
> it but can't seem to get any vertical deflection. I setup a little LED
> flasher with a 16F88 and put it in INTRC+ClkOut. When I measure the
> clock frequency with my multimeter I get 62kHz. But I can't get the
> scope to show any deflection. I was expecting to get a square wave
> with a peak voltage of 5v.
>
> I don't have the manual. It's a Tektronix 2336 100mhz. Any ideas?
Just taking a guess here, is there a knob that is set to "ground" or
"gnd" instead of DC or AC?
Regards,
Mark
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Author: rpsommers@gmail.comDate: 22:11 04-05-07
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On May 4, 8:51 pm, redbelly <redbell...@yahoo.com> wrote:
> On May 4, 8:30 pm, "rpsomm...@gmail.com" <rpsomm...@gmail.com>
wrote:
>
> > I just received an oscilloscope I bought off eBay. I'm trying to test
> > it but can't seem to get any vertical deflection. I setup a little LED
> > flasher with a 16F88 and put it in INTRC+ClkOut. When I measure the
> > clock frequency with my multimeter I get 62kHz. But I can't get the
> > scope to show any deflection. I was expecting to get a square wave
> > with a peak voltage of 5v.
>
> > I don't have the manual. It's a Tektronix 2336 100mhz. Any ideas?
>
> Just taking a guess here, is there a knob that is set to "ground" or
> "gnd" instead of DC or AC?
>
> Regards,
>
> Mark
I've tried both channels on AC and DC.
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Author: Bob MyersDate: 22:21 04-05-07
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<rpsommers@gmail.com> wrote in message
news:1178325035.957693.26250@q75g2000hsh.googlegroups.com...
>I just received an oscilloscope I bought off eBay. I'm trying to test
> it but can't seem to get any vertical deflection. I setup a little LED
> flasher with a 16F88 and put it in INTRC+ClkOut.
You put in in WHERE? On the images I've been able to find
of the 2336, there doesn't seem to be any such input.
Bob M.
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Author: Phil AllisonDate: 22:33 04-05-07
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<rpsommers@gmail.com>
** Groper Alert !
> I've tried both channels on AC and DC.
** What ** ARE ** you seeing on the screen??
Nothing at all ?
....... Phil
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Author: Homer J SimpsonDate: 22:41 04-05-07
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<rpsommers@gmail.com> wrote in message
news:1178325035.957693.26250@q75g2000hsh.googlegroups.com...
> I just received an oscilloscope I bought off eBay. I'm trying to test
> it but can't seem to get any vertical deflection. I setup a little LED
> flasher with a 16F88 and put it in INTRC+ClkOut. When I measure the
> clock frequency with my multimeter I get 62kHz. But I can't get the
> scope to show any deflection. I was expecting to get a square wave
> with a peak voltage of 5v.
>
> I don't have the manual. It's a Tektronix 2336 100mhz. Any ideas?
Forget the probes. Just touch the input pin with a small screwdriver while
you are holding the metal shaft. You should get a ragged wave.
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Author: rpsommers@gmail.comDate: 22:45 04-05-07
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On May 4, 9:21 pm, "Bob Myers" <nospample...@address.invalid> wrote:
> <rpsomm...@gmail.com> wrote in message
>
> news:1178325035.957693.26250@q75g2000hsh.googlegroups.com...
>
> >I just received an oscilloscope I bought off eBay. I'm trying to test
> > it but can't seem to get any vertical deflection. I setup a little LED
> > flasher with a 16F88 and put it in INTRC+ClkOut.
>
> You put in in WHERE? On the images I've been able to find
> of the 2336, there doesn't seem to be any such input.
>
> Bob M.
Poor wording on my part. I was (am) just using a little PIC program to
generate a flashing LED so I know the circuit is working. I put the
PIC16F88 into the INTRC+ClkOut mode. Which, if my understanding is
correct, outputs the internal oscillator clock signal on a I/O pin.
PIC program:
org 0
goto main
org 0x100
main
bsf STATUS, RP0
movlw 0x0
movwf 0x5
bcf STATUS, RP0
loop_3 movlw 0x2
movwf 0x5
loop decfsz 0x20, f
goto loop
movlw 0x0
movwf 0x5
loop_2 decfsz 0x20, f
goto loop_2
goto loop_3
When I turn the circuit on the LED flashes as expected. And, if I use
the frequency counter on my multimeter between the clock output pin
(on the PIC) and ground I get about a 60khz reading. However, if I
attempt to sample the same signal with the scope I get nothing but the
horizontal sweep. I've tried different combinations of V/div and Time/
Div.
The only things I've been able to make the scope do is slow the
h.sweep down enough to see the scrolling dot. I've even tried to see
if I could get a DC offset with a battery, nothing.
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Author: Anthony FremontDate: 22:46 04-05-07
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Bob Myers wrote:
> <rpsommers@gmail.com> wrote in message
> news:1178325035.957693.26250@q75g2000hsh.googlegroups.com...
>> I just received an oscilloscope I bought off eBay. I'm trying to test
>> it but can't seem to get any vertical deflection. I setup a little
>> LED flasher with a 16F88 and put it in INTRC+ClkOut.
>
> You put in in WHERE? On the images I've been able to find
> of the 2336, there doesn't seem to be any such input.
He's referring to the way he set up the PIC. He is using the internal
oscillator block and having it simultaneously present the instruction clock
on an output pin. He is trying to see that clock signal.
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Author: Anthony FremontDate: 22:57 04-05-07
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rpsommers@gmail.com wrote:
> When I turn the circuit on the LED flashes as expected. And, if I use
> the frequency counter on my multimeter between the clock output pin
> (on the PIC) and ground I get about a 60khz reading. However, if I
> attempt to sample the same signal with the scope I get nothing but the
> horizontal sweep. I've tried different combinations of V/div and Time/
> Div.
>
> The only things I've been able to make the scope do is slow the
> h.sweep down enough to see the scrolling dot. I've even tried to see
> if I could get a DC offset with a battery, nothing.
Ok, it's triggering then. Have you made sure that the probe is switched to
the X1 or X10 positions? Do like Homer said to make sure it's not the
probe. Outside of something basic like that, it doesn't sound too good, but
I would think it kinda odd that both channels would be dead.
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Author: rpsommers@gmail.comDate: 23:29 04-05-07
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I've tried both 1x and 10x on two different probes (although I
purchased them from the same person on ebay at the same time). Messing
with various settings I've gotten it to the point of having the screen
blank unless I touch something metal, and then it will do a horizontal
sweep. But I've still not been able to get it to show any vertical
deflection.
The first time I powered it on, both channels were displayed on the
screen and I was able to use the V.Position knobs to move the
individual traces around, ever since first turning it on I haven't
even been able to get that much, and the V.position knobs do nothing
now. I'm wondering if something is wrong with the vertical circuit.
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Author: Homer J SimpsonDate: 23:54 04-05-07
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<rpsommers@gmail.com> wrote in message
news:1178335762.189663.62730@e65g2000hsc.googlegroups.com...
> I've tried both 1x and 10x on two different probes (although I
> purchased them from the same person on ebay at the same time). Messing
> with various settings I've gotten it to the point of having the screen
> blank unless I touch something metal, and then it will do a horizontal
> sweep. But I've still not been able to get it to show any vertical
> deflection.
>
> The first time I powered it on, both channels were displayed on the
> screen and I was able to use the V.Position knobs to move the
> individual traces around, ever since first turning it on I haven't
> even been able to get that much, and the V.position knobs do nothing
> now. I'm wondering if something is wrong with the vertical circuit.
You've set both channels to max sensitivity?
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Author: EeyoreDate: 02:07 05-05-07
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"rpsommers@gmail.com" wrote:
> On May 4, 8:51 pm, redbelly <redbell...@yahoo.com> wrote:
> > On May 4, 8:30 pm, "rpsomm...@gmail.com" <rpsomm...@gmail.com>
wrote:
> >
> > > I just received an oscilloscope I bought off eBay. I'm trying to test
> > > it but can't seem to get any vertical deflection. I setup a little LED
> > > flasher with a 16F88 and put it in INTRC+ClkOut. When I measure the
> > > clock frequency with my multimeter I get 62kHz. But I can't get the
> > > scope to show any deflection. I was expecting to get a square wave
> > > with a peak voltage of 5v.
> >
> > > I don't have the manual. It's a Tektronix 2336 100mhz. Any ideas?
> >
> > Just taking a guess here, is there a knob that is set to "ground" or
> > "gnd" instead of DC or AC?
> >
> > Regards,
> >
> > Mark
>
> I've tried both channels on AC and DC.
Do you get any deflection when you probe the +5V ?
Graham
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Author: Michael A. TerrellDate: 02:15 05-05-07
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"rpsommers@gmail.com" wrote:
>
> I just received an oscilloscope I bought off eBay. I'm trying to test
> it but can't seem to get any vertical deflection. I setup a little LED
> flasher with a 16F88 and put it in INTRC+ClkOut. When I measure the
> clock frequency with my multimeter I get 62kHz. But I can't get the
> scope to show any deflection. I was expecting to get a square wave
> with a peak voltage of 5v.
>
> I don't have the manual. It's a Tektronix 2336 100mhz. Any ideas?
The user manual is on the Tektronix website. http://www.tek.com/
Learn how to use a search engine.
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
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Author: rpsommers@gmail.comDate: 07:32 05-05-07
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> You've set both channels to max sensitivity?
Yes, same thing.
> Do you get any deflection when you probe the +5V ?
No.
> The user manual is on the Tektronix website. http://www.tek.com/
> Learn how to use a search engine.
You must be better than I am at it. I've spent a lot of time searching
through their Manual Finder section and have not found a manual for
the 2336. I found a service manual for a 2236, but on a different site.
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Author: Jon SlaughterDate: 07:49 05-05-07
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<rpsommers@gmail.com> wrote in message
news:1178325035.957693.26250@q75g2000hsh.googlegroups.com...
>I just received an oscilloscope I bought off eBay. I'm trying to test
> it but can't seem to get any vertical deflection. I setup a little LED
> flasher with a 16F88 and put it in INTRC+ClkOut. When I measure the
> clock frequency with my multimeter I get 62kHz. But I can't get the
> scope to show any deflection. I was expecting to get a square wave
> with a peak voltage of 5v.
>
> I don't have the manual. It's a Tektronix 2336 100mhz. Any ideas?
>
You do realize taht ebay isn't the best source of quality(i.e. working)
equipment? Its probably the largest source of con arists and scammers that
exist.
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Author: MikeDate: 08:39 05-05-07
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On 5 May 2007 04:32:13 -0700, "rpsommers@gmail.com" <rpsommers@gmail.com>
wrote:
>> You've set both channels to max sensitivity?
>
>Yes, same thing.
>
>> Do you get any deflection when you probe the +5V ?
>
>No.
>
>> The user manual is on the Tektronix website. http://www.tek.com/
>> Learn how to use a search engine.
>
>You must be better than I am at it. I've spent a lot of time searching
>through their Manual Finder section and have not found a manual for
>the 2336. I found a service manual for a 2236, but on a different site.
I couldn't find it there either, but you can get it at http://bama.sbc.edu/tektroni.htm
The site is very slow and hard to get in, but I did finally get the manual.
You might try here also http://dion.swamp.dk/tek2236.html
Mike
"As we survey all the evidence, the thought insistently
arises that some supernatural agency - or, rather,
Agency - must be involved. Is it possible that suddenly,
without intending to, we have stumbled upon scientific
proof of the existence of a Supreme Being? Was it God
who stepped in and so providentially crafted the
cosmos for our benefit?"
George Greenstein - Astrophysicist
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Author: rpsommers@gmail.comDate: 08:44 05-05-07
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On May 5, 7:39 am, Mike <nomtrxs...@comcast.net> wrote:
> I couldn't find it there either, but you can get it
athttp://bama.sbc.edu/tektroni.htm
> The site is very slow and hard to get in, but I did finally get the manual.
> You might try here alsohttp://dion.swamp.dk/tek2236.html
Yes, I found the manual for the 2236, unfortunately I have the 2336. I
tried the baseline test procedures from the 2236 manual as much as I
could. I don't seem to get the 1khz square wave when I test the
calibration output on the device.
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Author: Anthony FremontDate: 09:04 05-05-07
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Jon Slaughter wrote:
> <rpsommers@gmail.com> wrote in message
> news:1178325035.957693.26250@q75g2000hsh.googlegroups.com...
>> I just received an oscilloscope I bought off eBay. I'm trying to test
>> it but can't seem to get any vertical deflection. I setup a little
>> LED flasher with a 16F88 and put it in INTRC+ClkOut. When I measure
>> the clock frequency with my multimeter I get 62kHz. But I can't get
>> the scope to show any deflection. I was expecting to get a square
>> wave with a peak voltage of 5v.
>>
>> I don't have the manual. It's a Tektronix 2336 100mhz. Any ideas?
>>
>
> You do realize taht ebay isn't the best source of quality(i.e.
> working) equipment? Its probably the largest source of con arists and
> scammers that exist.
Ok Jon, no need to rub salt in the wound. :-) E-bay is what it is, a cross
section of society; the good and the bad. I've gotten some great deals on
E-bay, but I've been rooked a time or two as well. Could be that the scope
worked perfectly and that it was damaged in shipping, or any of a number of
other possibilities. Before passing judgment, maybe we should wait to see
how the seller treats the OP.
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Author: Scott BrehlerDate: 09:46 05-05-07
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<rpsommers@gmail.com> wrote in message
news:1178325035.957693.26250@q75g2000hsh.googlegroups.com...
> I just received an oscilloscope I bought off eBay. I'm trying to test
> it but can't seem to get any vertical deflection. I setup a little LED
> flasher with a 16F88 and put it in INTRC+ClkOut. When I measure the
> clock frequency with my multimeter I get 62kHz. But I can't get the
> scope to show any deflection. I was expecting to get a square wave
> with a peak voltage of 5v.
>
> I don't have the manual. It's a Tektronix 2336 100mhz. Any ideas?
>
Just a guess, since it seems I was having a similar problem with my scope
(Tek 2235 - 100Mhz). Are you grounding the probe? There should be a clip
that comes off the probe to ground it. Sorry if my answer seems obvious,
just thought I'd throw my 2 cents in. Good luck.
Scott
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Author: Jon SlaughterDate: 09:49 05-05-07
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"Anthony Fremont" <spam-not@nowhere.com> wrote in message
news:133p06j10po8s66@news.supernews.com...
> Jon Slaughter wrote:
>> <rpsommers@gmail.com> wrote in message
>> news:1178325035.957693.26250@q75g2000hsh.googlegroups.com...
>>> I just received an oscilloscope I bought off eBay. I'm trying to test
>>> it but can't seem to get any vertical deflection. I setup a little
>>> LED flasher with a 16F88 and put it in INTRC+ClkOut. When I measure
>>> the clock frequency with my multimeter I get 62kHz. But I can't get
>>> the scope to show any deflection. I was expecting to get a square
>>> wave with a peak voltage of 5v.
>>>
>>> I don't have the manual. It's a Tektronix 2336 100mhz. Any ideas?
>>>
>>
>> You do realize taht ebay isn't the best source of quality(i.e.
>> working) equipment? Its probably the largest source of con arists and
>> scammers that exist.
>
> Ok Jon, no need to rub salt in the wound. :-) E-bay is what it is, a
> cross section of society; the good and the bad. I've gotten some great
> deals on E-bay, but I've been rooked a time or two as well. Could be that
> the scope worked perfectly and that it was damaged in shipping, or any of
> a number of other possibilities. Before passing judgment, maybe we should
> wait to see how the seller treats the OP.
I haven't passed judgement. I'm just pointing out a fact about ebay. The
real issue is that ebay doesn't really care about it. If it any fault then
it would be ebays.
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