I need a scope

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#41
OK Guys 🙂 anyone had experience with BWD scopes (made here in Australia)... This one has turned up on Ebay and I'm thinking that because the guy has no specs on it (and googling has turned up nothing) that it will probably go cheap. ---> http://cgi.ebay.com.au/BWD-539B-Osc...5796509026QQcategoryZ1502QQrdZ1QQcmdZViewItem

I'm assuming it would be at least 10Mhz, anyone know 🙂 If it is cheap enough then is it worth bidding for?

edit: there is also a tek 2235 with an opening bid of $475 Aus and a buy it now price of $500 AUS.... I'm tempted but it is still higher than I wanted to pay.

One other question is on sampling rate, I went back and looked at the bitscope, and it said it's bandwidth is 100Hz but it's max sampling rate is 40 Ms/S I don't understand this, if it only samples 40 million times a second how can it have 100Mhz bandwidth.... :xeye: edit2: ok I think I just realised, 40Ms/s is for digital 100MHhz is for analog 🙂 I'm thinking if I can't get anything decent for less that $600 then I might as well get one of these 😉

Tony.
 
#42
wintermute said:

One other question is on sampling rate, I went back and looked at the bitscope, and it said it's bandwidth is 100Hz but it's max sampling rate is 40 Ms/S I don't understand this, if it only samples 40 million times a second how can it have 100Mhz bandwidth.... :xeye:

Tony.
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It can't for one-shot events. But if you have a repetitive waveform, it can gather it in bits and pieces, then reconstruct it.
 
#45
A digital scope doesn't lie, but it doesn't always tell the truth
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A lot of CEO's overhere, like the ones at Philips, have been doing a lot of that oversampling for the last decade.

Doing some googling looking for probes for my latest scope find, i noticed the steep prices for oscilloscope stuff in Australia, even at AUD rates.
Also ran across some pages on scopes in the Asian corner, prices there seemed to be a lot lower.
As those parts are not too far from Oz, relatively speaking, considered checking for a reconditioned calibrated scope there, Tony ?
 
#46
jacco vermeulen said:


A lot of CEO's overhere, like the ones at Philips, have been doing a lot of that oversampling for the last decade.

Doing some googling looking for probes for my latest scope find, i noticed the steep prices for oscilloscope stuff in Australia, even at AUD rates.
Also ran across some pages on scopes in the Asian corner, prices there seemed to be a lot lower.
As those parts are not too far from Oz, relatively speaking, considered checking for a reconditioned calibrated scope there, Tony ?
Click to expand...

No I hadn't really.... but you see why I'm :bawling: when I see the price you guys in Europe, or the US get them for 🙂 whereabouts in Asia?? singapore, indonesia??

Thanks 🙂

Tony.
 
#47
@jacco:

The 465 and 466 I've seen here were most times produced either Beaverton oder Heerenveen (your area).

The 455: Well, I have only seen the Beaverton ones here, but I have freinds who own the heerenveen products.

475 late modes with all improvements: Seen a lot of them from Heerenveen here for sale in my area. Nice units ;-)

@ apassgear:

Well, the TM500 modular series can make a nice addition if you need a combo of multimeter/frequency counter/powr supply/sine/ function generators. All very nice units. But for nowadays, I think for higher demands you are better of with used HP gear. Especially if you are in audio development: The TM500 series is limited due to specs. But a TM504/SG502/FG501/DM502 is still nice as a general starter set. The SG505 is a very low distortion gnerator (see DIYaudio for remakrs, pls. ) but heavily searched and that means high price. There are also scope plugins for TM500 (SC501/2/3/4 - but the screens are real small and a SC504 80 MHz (fastet available in tM500) is most times around 200-250 euros (230 -290 US$). You will get more bang for the buckwith other scopes.

The nicest feature of the Tek 7704 and 7904 to my personal taste: NO FAN - real quiet. Great relief when you do hours in the lab. 🙂))

@ wintermute:

Well, another price problem is shipment cost to AUS from europe. So if you want an affordable scope: Take a trip to Munich octoberfest (big party in munich for 14 days) -- and buy a scope while you are here. So you get happy twice. ;-)


hth,
Andreas
 
#48
tekman said:
Well, another price problem is shipment cost to AUS from europe. So if you want an affordable scope: Take a trip to Munich octoberfest (big party in munich for 14 days) -- and buy a scope while you are here. So you get happy twice. ;-)


hth,
Andreas
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good`idea 🙂 :drink:

Tony.
 
#50
Mark A. Gulbrandsen said:
no where near as well made as the earlier 45x and 46x series and older crts were, the gun spot size is considerably larger on all of the later ones.
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I gathered the 45x series are all or part tube.
Does a tube scope have a advantage over solid state units ?
On a vintage homepage i read the Tek 551 with tube plugins has over 100 tubes and consumes nearly a kilowatt.
Is it still possible to find all the right tubes for these models ?
 
#51
jacco vermeulen said:

Does a tube scope have a advantage over solid state units ?
On a vintage homepage i read the Tek 551 with tube plugins has over 100 tubes and consumes nearly a kilowatt.
Is it still possible to find all the right tubes for these models ?
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The Tektronix tube scopes are very quiet (except for the fan) -- the tubes aren't difficult to find. The boat anchor variety are give-aways. In my case I gave a 545 away to an unsuspecting physicist while he wasn't looking.

One of the problems I had with a tube scope was that many components were mounted on porcelein strips -- these could accumulate dust -- I was told not to clean the strips with anything abrasive as they would then arc-over.
 
#52
I gathered the 45x series are all or part tube.
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No, they're all solid state, but made with early silicon devices.... probably harder to get that any tube for a tube type scope. Tektronox started to go solid state in the 5xx series input midules at first then discontinued the 5xx series and went backwards to the 45x series which is all solid state. I ahve one TEK tube scope, a 3" model 310A and it has a bunch of tubes, I think close to 40 for a single channel 10 mhz scope. It also weighs more than my 456B does! Tube scopes are good for working on or around very high voltage things.... I use my tube scope when I work on the old post war tube type TV's that I sometimes restore.....

Mark
 
#55
Actually I was wrong on the model#, its a 315D... donno why I thought it was a 310. Here is a bottom view showing the ceramic strips. These strips have silver inserts where the solder connections are made. TEK always placed a small roll od the correct silver solder inside each scope clipped to the chassis. If one does not use silver solder then you risk the silver insert seperating from the ceramic strip.

On the left section you can see the black tubular caps that are clolr coded. According to one retired TEK engineer on the TEK Group forum these caps are the main reason why so many tube TEK scopes cease to finction. Merely replacing all these caps brought my scope back to life. All the tubes tested good as did the electrolytics!!

All photos were taken before restoration!!

Mark
 

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#59
Mark A. Gulbrandsen said:
According to one retired TEK engineer on the TEK Group forum these caps are the main reason why so many tube TEK scopes cease to finction. Merely replacing all these caps brought my scope back to life. All the tubes tested good as did the electrolytics!!
Click to expand...

You are saying a tube scoop can be a good investment ?
The boat ancher powersupply versions i see here for next to nothing, as Father Jack posted.
 
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