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Sci.Electronics.Basics -> Beginning Oscilloscope Question
There are 26 messages in this thread.
You are currently looking at messages 20 to 26.
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Author: Richard SerianiDate: 11:04 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?
>
Since all the other posts haven't seemed to get you anywhere, find someone
in your local community who knows how to use a scope and ask for their help.
Suggested sources: vo-tech, commmunity college, ham radio operators, TV
shop. Check the yellow pages. Google ARRL to find local Hams.
Post the city you live in and there may even be someone on this newgroup who
could help you.
Someone will at least be able to tell you if you bought a defective piece of
equipment.
Richard
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Author: rpsommers@gmail.comDate: 11:57 05-05-07
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> Since all the other posts haven't seemed to get you anywhere, find someone
> in your local community who knows how to use a scope and ask for their help.
> Suggested sources: vo-tech, commmunity college, ham radio operators, TV
> shop. Check the yellow pages. Google ARRL to find local Hams.
> Post the city you live in and there may even be someone on this newgroup who
> could help you.
> Someone will at least be able to tell you if you bought a defective piece of
> equipment.
>
> Richard
That's good advice and I will try doing that. In the past I've looked
and unfortunately the only electronics hobby store isn't open on the
weekends and not open during the evenings during the week. As I work
full time, I've never been able to make it over there. I'm actually a
ham radio operator, although I got my license 13 years ago and haven't
done anything with it since (except renew the license).
I'm in South East Minnesota.
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Author: Homer J SimpsonDate: 23:49 05-05-07
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"Jon Slaughter" <Jon_Slaughter@Hotmail.com> wrote in message
news:3Y%_h.7034$2v1.6906@newssvr14.news.prodigy.net...
> 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.
An incorrect fact. Your deal is between buyer and seller. Some sellers are
good. Some are crooks. Have you ever had a car repaired?
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Author: Homer J SimpsonDate: 23:49 05-05-07
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<rpsommers@gmail.com> wrote in message
news:1178380638.802155.275610@w5g2000hsg.googlegroups.com...
> That's good advice and I will try doing that. In the past I've looked
> and unfortunately the only electronics hobby store isn't open on the
> weekends and not open during the evenings during the week. As I work
> full time, I've never been able to make it over there. I'm actually a
> ham radio operator, although I got my license 13 years ago and haven't
> done anything with it since (except renew the license).
If there is a beam finder, is it off?
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Author: JamieDate: 07:30 06-05-07
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rpsommers@gmail.com wrote:
> 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.
>
check the back of your scope to make sure it wasn't set up for X Y mode.
It may had been used for plotting curves against an oscillator reference
and number reconfigured.
--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
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Author: JamieDate: 07:37 06-05-07
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Scott Brehler 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?
>>
>
>
> 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
>
>
I don't know that scope a lot how ever, he did say he lost the ability
to move the vertical trace up and down. That tells me that something
is wrong with the X Y modes, it's possible it's half way switched between.
Not sure if those functions are on the back like a lot of them are to
set up?
I know that some of them had jumper links and so on.
--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
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