Re: A cautionary tale ...
Mine actually has 3 in that position - I had assumed that was their
purpose - thanks for the warning, though.
Dave
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On 08/12/2018 13:56, george edmonds via Groups.Io wrote: Hi Dave
Although it is difficult to know where your "spare" screw came from
please make sure that the rear right hand side case screw ?is present,
it is part of the power supply heat sink path and is frequently missing.
73 George G6HIG
On Saturday, December 8, 2018 12:57 PM, David Slipper
<softfoot@...> wrote:
I have acquired a Tek 2225 as a 50MHz analogue alternative to my TDS744A
but before I powered it on I took the case off to make sure nothing had
shaken loose in transit (I make that a policy for mains powered stuff).
Everything was OK but I did find a loose screw rolling around in the PSU
area !!!
I am very glad I gave the thing a "once-over" or I would have allowed
the "magic smoke" to escape !!!
I seem to remember someone else finding loose screws.
One place I worked always played an air line around the kit before
putting the covers on looking for surplus/dropped screws and other
rubbish.
BTW I'm very pleased with the 2225, works nicely and is a bit more
portable than the 744A.? I'd have preferred a 2235, but I may get one of
those as well - just don't tell the wife !!! ;-)
Now at 5 and counting ;-)
Dave
.
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Yes, that may work with the application of some self-adhesive Velcro.
Dave
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On 08/12/2018 15:28, Richard Solomon wrote: How about heavy duty, large
Zip Lock bags ?
73, Dick, W1KSZ
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Re: Smashed CRT on a 2215 - where to find a substitue?
If there were an included thread to even SKIM 8^(
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On 12/8/2018 10:40 AM, Carsten Bormann wrote: On Dec 8, 2018, at 16:17, Carsten Bormann via Groups.Io <cabocabo@...> wrote:
Well he did give it away, no? (No, he didn¡¯t. That¡¯s what you get for replying after just skimming a thread. Promise to better myself.)
Gr¨¹?e, Carsten
--
Dave
Manuals@...
www.ArtekManuals.com
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Re: TDS3032 does not boot. LCD backl-ight and fan working.
Thanks Dave.
I suspected that a bad NVRAM will let the scope at least get as far as the DPO splash screen.
I guess I have a deeper problem.
Can anybody else suggest where I should look?
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Re: Smashed CRT on a 2215 - where to find a substitue?
On Dec 8, 2018, at 16:17, Carsten Bormann via Groups.Io <cabocabo@...> wrote:
Well he did give it away, no?
(No, he didn¡¯t. That¡¯s what you get for replying after just skimming a thread. Promise to better myself.) Gr¨¹?e, Carsten
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Old devices often have a characteristic smell, e.g., from the dust that is being cooked inside the device.
Some of this smell unfortunately stems from leaking capacitors.
Is there a guide somewhere that allows mapping a specific smell to a specific kind of capacitor?
I know we don¡¯t have smell-o-vision in the Internet, but it should still be possible to verbally describe smells.
I¡¯m asking because I have an FG501A with some performance problems, as well as a characteristic smell.
Soapy, perfumy, I¡¯d say. I don¡¯t ¡°see¡± which capacitors are leaking, so I would love to use the smell to point to potential culprits.
(Of course, the performance problems could be unrelated to the smell, and the smell could also come from other components cooking themselves. In any case, it would also be nice to know how toxic that smell is¡)
Gr¨¹?e, Carsten
|
How about heavy duty, large
Zip Lock bags ?
73, Dick, W1KSZ
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On Sat, Dec 8, 2018 at 8:17 AM Bill Riches <bill.riches@...> wrote: The zipper bags packed with Shure Microphones - sm58 and others?
73,
Bill, WA2DVU
Cape May, NJ
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Chuck Harris
Sent: Saturday, December 8, 2018 9:09 AM
To: [email protected]
Subject: Re: [TekScopes] Probe bags ...
All the originals were was pencil bags for kids to bring to school,
clipped into their 3 ring binders...
Perhaps try a stationary store?
-Chuck Harris
David Slipper wrote:
Has anyone come across a source of probe/manual bags - or a workable
alternative ??
Dave
|
Re: Smashed CRT on a 2215 - where to find a substitue?
Where in the world are you, Well he did give it away, no? 73 George G6HIG Gr¨¹?e, Carsten
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The zipper bags packed with Shure Microphones - sm58 and others?
73,
Bill, WA2DVU
Cape May, NJ
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-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Chuck Harris Sent: Saturday, December 8, 2018 9:09 AM To: [email protected]Subject: Re: [TekScopes] Probe bags ... All the originals were was pencil bags for kids to bring to school, clipped into their 3 ring binders... Perhaps try a stationary store? -Chuck Harris David Slipper wrote:
Has anyone come across a source of probe/manual bags - or a workable
alternative ??
Dave
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Re: Russian Tunnel Diodes
The only issue I have with Leo's product is that according to his pictures, it doesn't have a very
good
flat top and bottom to the pulse. The fast rise time is good for measuring the bandwidth of the
scope
(which may be all he intended to do), but if you are wanting to use his pulser to adjust the
transient
response of a scope, you need a clean flat top on your test pulse.
Chuck Harris Depends on the response of the scope you are adjusting. 1GHz at 350ps rise is as far as I go without sampling plugins, so a couple of transient wobbles at ~15GHz at 3% p-p really doesn't matter. So has BNC version is just fine. Crau=ig
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Re: Smashed CRT on a 2215 - where to find a substitue?
On 2018-12-08 1:22 AM, eksund1900 via Groups.Io wrote: Hi!
Just bought a 2215 scope, but unfortunately it was destroyed by the transportation company.
The CRT tube was smashed. Is it possible to find a spare anywhere in the world? Yes, Qservice sells CRTs, you could contact them about a compatible part. e.g. based on the part number suggested by Brendan. Prices vary. And is it a wise thing to do, regarding the relatively low price on those scopes? Yes, they won't be plentiful forever, thanks to regular events like you just experienced, and the widespread fallacy that newer is better. --Toby
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Hi,
I have been faffing about with a 466 with a channel 2 problem for a few weeks, and though I might eventually sort it, I thought I would consult the experts and possibly save a bit of time.
The scope came with a non-operational delayed time-base and an intermittent graticule illumination light. I have fixed both of these now, but the channel 2 problem is bugging me. The scope works on channel 1 alone fine, so it can't be anything after the diode-switching circuitry (can it?), but channel 2 doesn't display normally. If I push the beam-finder switch, I see channel 2, but the position control does nothing. If I use a slow time-base setting and switch to "alternate", I can see channel 1 and there is a period when channel 2 would be displayed, but no channel 2 shows. I have checked voltages and signals for channel 2 from the end of the attenuator through to the diode channel switching (possibly not comprehensively) and mostly cannot see anything untoward. I have also checked to see that the "position" control does change the voltages on the two nominal +2.8V rails, but rather asymmetrically (-0.6 to +2.8V on one rail and 2.79 to 2.8V on the other). I am suspecting that there is something wrong with the "position" control circuitry, but changing Q262 didn't solve the problem.
I also noted that I cannot trigger the time-base from channel 2.
Am I missing something obvious? I would like to get this 466 working, as it is one of three that I have, one of which has already become a parts-donor. I might even try fixing the other one sometime.
TIA, Colin.
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Re: A cautionary tale ...
Sometimes I do a "shakedown". All angles and shake shake shake. It'll get things out that compressed air won't sometimes. Sometimes I had to do it on some rather large TVs which might require help, but on most scopes and other equipment of the same general size and weight it works fine.
Thanks for the reminder BTW, I have lately come to the conclusion that much of what I work on has been gotten into before and who knows how the last guy left things.
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Oops! I thought you meant the little clear vinyl
bags that hold the probes and tips... I missed the
"manuals" part.
-Chuck Harris
Chuck Harris wrote:
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All the originals were was pencil bags for kids to bring
to school, clipped into their 3 ring binders...
Perhaps try a stationary store?
-Chuck Harris
David Slipper wrote:
Has anyone come across a source of probe/manual bags - or a workable
alternative ??
Dave
|
I have bought one or two off eBay. Don't forget that there are two sizes for the 4xx scopes - the short one fits the 468 and scopes with the DMM "penthouse". You also need to have a case with both of the fastening features - sometimes the front fixing is missing.
Colin.
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of David Slipper Sent: 08 December 2018 13:08 To: [email protected]Subject: [TekScopes] Probe bags ... Has anyone come across a source of probe/manual bags - or a workable alternative ?? Dave
|
All the originals were was pencil bags for kids to bring
to school, clipped into their 3 ring binders...
Perhaps try a stationary store?
-Chuck Harris
David Slipper wrote:
toggle quoted message
Show quoted text
Has anyone come across a source of probe/manual bags - or a workable
alternative ??
Dave
|
Re: Russian Tunnel Diodes
I haven't tried Leo's product, so take what I say with a grain of
salt, or two...
The only issue I have with Leo's product is that according to his
pictures, it doesn't have a very good flat top and bottom to the
pulse. The fast rise time is good for measuring the bandwidth of
the scope (which may be all he intended to do), but if you are
wanting to use his pulser to adjust the transient response of a
scope, you need a clean flat top on your test pulse.
Chuck Harris
Craig Sawyers wrote:
...
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I understand entirely the interest in building TD pulsers, and replicating/repairing Tek ones.
But a bit of heresy - the Leo Bodnar pulsers produce 30ps rise, and around 24ps fall time. They come
with a calibration certificate too. For UKP49 to UKP99 depending on the output connector. Run from USB
power, from which you can adjust the amplitude from the app. They run at 10MHz with 2.5ppm accuracy,
so can be used for timebase checks too. I have the BNC version, which is the cheapest.
Craig
|
Re: A cautionary tale ...
Hi Dave
Although it is difficult to know where your "spare" screw came from please make sure that the rear right hand side case screw ?is present, it is part of the power supply heat sink path and is frequently missing.
73 George G6HIG
toggle quoted message
Show quoted text
On Saturday, December 8, 2018 12:57 PM, David Slipper <softfoot@...> wrote:
I have acquired a Tek 2225 as a 50MHz analogue alternative to my TDS744A
but before I powered it on I took the case off to make sure nothing had
shaken loose in transit (I make that a policy for mains powered stuff).
Everything was OK but I did find a loose screw rolling around in the PSU
area !!!
I am very glad I gave the thing a "once-over" or I would have allowed
the "magic smoke" to escape !!!
I seem to remember someone else finding loose screws.
One place I worked always played an air line around the kit before
putting the covers on looking for surplus/dropped screws and other rubbish.
BTW I'm very pleased with the 2225, works nicely and is a bit more
portable than the 744A.? I'd have preferred a 2235, but I may get one of
those as well - just don't tell the wife !!! ;-)
Now at 5 and counting ;-)
Dave
|
Re: Smashed CRT on a 2215 - where to find a substitue?
Hi
Where in the world are you, it would be helpful if such requests included such information as shipping cost are a major factor in the viability of supplying spares.
73 George G6HIG
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On Saturday, December 8, 2018 1:37 PM, lop pol via Groups.Io <the_infinite_penguin@...> wrote: On Sat, Dec? 8, 2018 at 06:09 AM, <eksund1900@...> wrote:
Hi!
Just bought a 2215 scope, but unfortunately it was destroyed by the
transportation company.
The CRT tube was smashed. Is it possible to find a spare anywhere in the
world?
And is it a wise thing to do, regarding the relatively low price on those
scopes?
There are several CRT that fit that scope some come with a different HV lead so don't throw the old one away yet before you know if you need to chop off the lead and use the one from the broken CRT. Which I had to do in the case of my 2215. I spliced the leads and used about 5 coats of liquid tape.? I used a 154-0861-00 out of a 2235 found on evil-bay for under $40 shipped. Only you can decide if fixing the scope is worth it. Brendan
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Try cleaning the beamfinder switch with alcohol, exercise it 10-20 times after that.
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Bill Riches
Jeff Urban
satbeginner