problems with Dick Sniff's cheap 10Mhz CRO

[Phil Allison]

"Simple Simon"

" Im a complete boob with a CRO btw, "

Mine has one, but its on the connector end not the probe itself like the
manual would suggest.

** No.

The DSE user manual has it shown on the BNC socket end, fig 3.5, page 9.

Geezus - there out to be a law against supplying anything technical to
this Simon boob.

Like the one the prohibited the sale of guns to Indians in the Old West
!!!!






......... Phil

 

[Alan Rutlidge]

"Simple Simon"




** I wonder what this * monumental congenital fuckwit * imagines the
word "square" means.




........ Phil

Could someone here please send Philthy Phil a Christmas present.
Make it a new vocabulary which doesn't include all the potty mouth stuff he
seems to have overdone here in the past year please.

 

[David L. Jones]

heh, Ive actually got Phil blacklisted, so there ya go.

So the concensus is that its busted?

Yep, take it back to Tricky Dickies.

Dave

 

[Bob Parker]

thanks for the photo Bob, I adjusted my settings to match yours and I get
a solid flaring blob

Back she goes!

There's something seriously wrong with the trace width and
astigmatism on yours. Assuming that you don't go for a refund, when you
get a replacement unit, follow the instructions for setting up the probe
compensation so you get a nice looking square wave.

Cheers
Bob

 

[Simon]

Thanks for doing that. A picture's worth >1K words. Apart from the

No, thank you!

fact that the probe's compensation is badly
misadjusted, to me it looks like your CRO's showing the symptoms of
excessive EHT (CRT high voltage supply) which is making the trace too
small and wrecking the astigmatism (focus over the whole screen area).

I played with the compensation, but without a decent sine to adjust
against its a waste of time.

The probe adjustment signal should look like this photo:
http://members.ozemail.com.au/~bobpar/P9146256.JPG
I agree with Phil - the CRO's faulty so ask DSE for a replacement.

Bob

thanks for the photo Bob, I adjusted my settings to match yours and I get
a solid flaring blob

Back she goes!

 

[Simon]

The previous owner of my Q1803 got a faulty probe with it. When he
took the probe back to DSE under warranty, they supplied him with a better
one which does have a compensation adjustment cap.

Bob

Mine has one, but its on the connector end not the probe itself like the
manual would suggest.

 

[Bob Parker]

so what kind of camera did you have then

Not sure which camera you're referring to. You'll have to ask Simon
what he used. Mine was taken with an Olympus C-740.

Bob

 

[Phil Allison]

"Simple Simon"

Thanks Bob, I just swapped it out for a fresh unit and it now works fine.

Musta copped a beating in the post I guess.

** ROTFLMAO !!

So " Simon The Congenital Fuckwit Simpleton " lives right near a DSE
store - but still chose to buy himself a fragile CRO by mail order
....... ????????






......... Phil

 

[Bob Parker]

Thanks Bob, I just swapped it out for a fresh unit and it now works fine.

Musta copped a beating in the post I guess.

Thanks again for your help

No worries. We'll never know exactly what the problem was.

Q1803s don't work at all if they get thrown around violently enough.
See http://members.ozemail.com.au/~bobpar/Q1803/austpost.htm if you
haven't already.

Cheers
Bob

 

[Simon]

There's something seriously wrong with the trace width and
astigmatism on yours. Assuming that you don't go for a refund, when you
get a replacement unit, follow the instructions for setting up the probe
compensation so you get a nice looking square wave.

Thanks Bob, I just swapped it out for a fresh unit and it now works fine.

Musta copped a beating in the post I guess.

Thanks again for your help

 

[kreed]

what a surprise

Im a complete noob, so can anyone answer the following?

1) Why is the image wider at the bottom of the screen than at the top?
2) Why can I only focus one side of the screen at a time?
3) Why can I not see the near vertical lines on a wave, but only the peaks
and troughs?
4) Why is the line wider on one side of the screen than the other?
5) Have I got a dud?

Its a real bitch to level the screen too, the mechanism at the back
appears to be seized. I got there in the end though.

--------------
The vertical lines you can't see because their rise and/or fall time is
virtually instantaneous. You don't need any fancy electronics to
achieve this fast rise time, I first got caught out on this "invisible
vertical trace" when first using a CRO back in the 80s measuring the
square wave output from a 555,

The other problems sound like a faulty unit or CRT, unless you have
excessive mains voltage at your house maybe ? Might be worth measuring
it (WARNING: DON'T attempt this if you don't know exactly what you are
doing, instead, retest the unit at someone elses house or at DS store.)

Take it back, and explain the problem, they will probably let you take
another one, and if you still have troubles, I'm pretty sure DS have
got a satisfaction guarantee on everything as long as its returned
undamaged, in original packing and with the receipt.

 

[Simon]

The vertical lines you can't see because their rise and/or fall time is
virtually instantaneous. You don't need any fancy electronics to achieve
this fast rise time, I first got caught out on this "invisible vertical
trace" when first using a CRO back in the 80s measuring the square wave
output from a 555,

Yeh, I understand it now. I was actually expecting the test signal to be a
sine because of the curvature of what was showing on screen. Little did I
know it was like that because the thing was shot to hell.

The other problems sound like a faulty unit or CRT, unless you have
excessive mains voltage at your house maybe ? Might be worth measuring it
(WARNING: DON'T attempt this if you don't know exactly what you are doing,
instead, retest the unit at someone elses house or at DS store.)

Naw, no excessive voltage here. If anything we're a bit under

Take it back, and explain the problem, they will probably let you take
another one, and if you still have troubles, I'm pretty sure DS have got a
satisfaction guarantee on everything as long as its returned undamaged, in
original packing and with the receipt.

Yeh, did that this arvo - the new unit works flawlessly. \o/

 

[David L. Jones]

"Simple Simon"



** ROTFLMAO !!

So " Simon The Congenital Fuckwit Simpleton " lives right near a DSE
store - but still chose to buy himself a fragile CRO by mail order
...... ????????

How many hands does it go through before it gets to the DSE store?
Plenty I bet, one extra leg ain't much on top of that.

Some poeple don't have the time to pop into a DSE store, could easily
waste an hour of your time, and to some people that's valuable. Often
easier and cheaper to get something posted.

Dave

 

[Phil Allison]

"David L. Jones Total Wanker "

How many hands does it go through before it gets to the DSE store?

** None involving Australia Post.

None involving individual items.

Plenty I bet, one extra leg ain't much on top of that.

** Not when that extra leg involves Australia Post and the item is
fragile.

Some poeple don't have the time to pop into a DSE store, could easily
waste an hour of your time, and to some people that's valuable.

** What hypothetical crapology.

The Jones Moron excels in this art.

Often easier and cheaper to get something posted.

** Note when you are near a store, the item is in stock and is fragile.

FUCKWIT !!!



......... Phil

 

[David L. Jones]

"David L. Jones Total Wanker "


** None involving Australia Post.



** Not when that extra leg involves Australia Post and the item is
fragile.

I've sent plenty of fragile items through Aust Post no problems at all,
including CRO's. If it's an inadequate packing issue then that's
another matter entirely.

** Note when you are near a store, the item is in stock and is fragile.

FUCKWIT !!!

Forget to take your meds again Phil?
Perhaps you should consider expanding your Toaster & Valve amp repair
business to include the multitude of DSE CRO's that will be busted by
Aust Post? A small ad in SC might work wonders.

Dave

 

[David L. Jones]

Yeh, I understand it now. I was actually expecting the test signal to be a
sine because of the curvature of what was showing on screen. Little did I
know it was like that because the thing was shot to hell.


Naw, no excessive voltage here. If anything we're a bit under




Yeh, did that this arvo - the new unit works flawlessly. \o/

Would not surprise me if the original unit came out of the factory like
that. QA on such low cost units is almost non-existent, it's a lucky
dip. Same deal with those el-cheapo multimeters, many of them have
faults out of the box.

Dave

 

[Phil Allison]

"David L. Jones Total Wanker& Pig Headed **** "

"Simple Simon"



I've sent plenty of fragile items through Aust Post no problems at all,
including CRO's.

** Shame about Bob Parker's experience with the EXACT SAME CRO that he
FULLY DETAILED right here on this NG very recently for all to see -
isn't it ???


YOU ASININE, ASD FUCKED BLOODY MORON !!!!

Forget to take your meds again Phil?

** Forget to take you regular dose of Rat Bait - ARSEHOLE ?





......... Phil

 

[Bob Parker]

I've sent plenty of fragile items through Aust Post no problems at all,
including CRO's. If it's an inadequate packing issue then that's
another matter entirely.

Well Dave, even Aussie Post said the Q1803 they smashed the CRT of
was packed adequately, then claimed it was already damaged when it was
posted. You can see their letter on my website.

Cheers
Bob

 

[David L. Jones]

Well Dave, even Aussie Post said the Q1803 they smashed the CRT of
was packed adequately, then claimed it was already damaged when it was
posted. You can see their letter on my website.

It may certainly well have been, do you know for sure it was working
before DSE sent it?
What was the packing like in the orginal CRO box?
The photo to me shows a rather small original box, and not what I would
call teriffic packaging outside it.

I recon you simply ran out of luck Bob, or perhaps this scope
construction has a particular weak point, shock or vibration wise?. As
I have said before I have shipped many fragile items including CROs by
Australia Post without any problem what so ever. But then again I am
*really* paranoid about packing.

Having recently run a great deal of shock and vibration repsonse tests
on packaging material for delicate electronics, I'm convinced more than
ever that packaging is the key. Aust Post are no worse than the likes
of other courier companies in my experience.

Dave

 

[Alan Rutlidge]

Would not surprise me if the original unit came out of the factory like
that. QA on such low cost units is almost non-existent, it's a lucky
dip. Same deal with those el-cheapo multimeters, many of them have
faults out of the box.

Dave

Dave, I think you're right on the money with that observation. If the box
retails at under $100 and obviously the retailer is still making a tidy
profit, one can only guess what the factory price is before shipping and
importing. Bugger all!
Yes the product still has QA - it's called the Customer.

The OP should just return it for an exchange or refund. No one in their
right mind would seriously consider repairing it as it would most likely
cost more than the buy in price to do so. When it makes it back to tricky
dickies it's most likely fate will to fall from a great height and become
another stock loss / insurance claim.

Cheers,
Alan